The electrochemical properties of the metal–organic framework (MOF)-based composite as electrode material can be significantly improved by means of partial destruction of the full coordination of linkers to metal ions and replacing with other small ions, which make metal centers become more accostable and consequently more effective for the lithiation/delithiation process. In this paper, F– was chosen to replace some of the benzenedicarboxylate (BDC) linkers because of its better interaction with the Li+ than the oxide ion. What’s more, the formed M–F bond promotes the Li+ to transfer at the active material interface and protects the surface from HF attacking. The as-synthesized F-doped Mn-MOF electrode maintains a reversible capacity of 927 mA h g–1 with capacity retention of 78.5% after 100 cycles at 100 mA g–1 and also exhibits a high discharge capacity of 716 mA h g–1 at 300 mA g–1 and 620 mA h g–1 at 500 mA g–1 after 500 cycles. Even at 1000 mA g–1, the electrode still maintains a high reversible capacity of 494 mA h g–1 after 500 cycles as well as a Coulombic efficiency of nearly 100%, which is drastically increased compared with pure Mn-MOF material as expected.Keywords: accessible metal sites; fluorine doping; lithium storage; metal−organic frameworks; varied fluorine contents;

Herein, Mn-MOF/RGOn composites have been successfully synthesized using terephthalic acid non-covalent functionalized graphene oxide (GO) sheets acting as efficient nucleation sites and structure-directing templates to direct the growth of MOFs. The electrochemical performance of the Mn-MOF/RGOn composite electrode was much better than that of the pristine Mn-MOF when used as a candidate anode material for lithium-ion batteries due to the synergetic advantages of RGO and Mn-MOF, improved electrical conductivity, and mechanical flexibility of Mn-MOF. Especially, the Mn-MOF/RGO10 composite electrode maintains a reversible discharge capacity of 715 mA h g−1 with a capacity retention of 98% after 100 cycles at 100 mA g−1 and also exhibits a high discharge capacity of 485 mA h g−1 at 300 mA g−1, 432 mA h g−1 at 500 mA g−1 while still maintaining 348 mA h g−1 at 1000 mA g−1 after 500 cycles, which is greatly higher as compared to that of the pure Mn-MOF material as expected.

Although the fluorinated graphene (FG) possesses numerous excellent properties, it can not be really applied in aqueous environments due to its high hydrophobicity. Therefore, how to achieve hydrophilic FG is a challenge. Here, a method of solvent-free urea melt synthesis is developed to prepare the hydrophilic urea-modified FG (UFG). Some characterizations via transmission electron microscopy (TEM), atomic force microscopy (AFM), Fourier transfer infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and thermo gravimetric analysis (TGA) demonstrate that the urea molecules can covalently functionalize the FG and the hydrophilic UFG can be prepared. According to the tribological tests run on an optimal-SRV-I reciprocation friction tester, it can be found that the antiwear ability of water can be largely improved by adding the appropriate UFG. When the concentration of UFG aqueous dispersion is 1 mg/mL, the sample of UFG-1 has the best antiwear ability with a 64.4% decrease of wear rate compared with that of the pure water (UFG-0), demonstrating the prepared UFG can be used as a novel and effective water-based lubricant additive.Keywords: fluorinated graphene (FG); friction; functionalization; hydrophilicity; water-based lubricant additive; wear

NixCo1−x(OH)2 composite microspheres with uniform sizes are successfully synthesized with the assistance of alkali solution by employing a bimetallic Co–Ni–metal organic framework (Co–Ni–MOF) as both the precursor and the self-sacrificing template. The as-obtained NixCo1−x(OH)2 composite demonstrates excellent electrochemical performance, including a high specific capacitance of 1235.9 F g−1 at a current density of 0.5 A g−1, good electrochemical stability, with ∼73% retention of its initial capacitance after 10000 cycles, and a high rate capability; this composite exhibits great application prospects as a novel electrode material for supercapacitors.

We have successfully fabricated hybrid Co3O4@Au-decorated PPy core/shell nanowire arrays (NWAs) on Ni foam via in situ interfacial polymerization between HAuCl4 and pyrrole monomers. With the advantages of high electrochemical activity of each component and high electrical conductivity of the Au-decorated PPy layer, this hybrid electrode exhibits remarkable pseudo-capacitive behaviors. This facile synthesis method offers an attractive strategy to further improve the electrochemical performance of pseudo-capacitors, and it undoubtedly shows promising applications in electrochemical energy storage.

Three dimensional (3D) hierarchical structures have attracted rapidly increasing attention in the energy storage field because they can facilitate electron and ion transport and electrolyte/electrode contact which results in full utilization of active materials. Here, a series of 3D hierarchical bismuth (Bi)-based compounds with different sizes and morphologies have been controllably synthesized by adjusting the Bi3+/urea molar ratio. Electrochemical characterizations indicated that the prepared Bi-based compounds exhibit high specific capacitance and superior rate capability in aqueous alkaline electrolyte (832 F g−1 at 1 A g−1, and still maintained 90% of the initial level at 20 A g−1), which can be attributed to their novel hierarchical structure.

•Ni(OH)2/GS and Bi2O3/GS composite were synthesized respectively by simple methods.•A novel Ni/Bi battery is assembled using Ni(OH)2/GS and Bi2O3/GS as electrode materials.•The Ni/Bi battery exhibits a high capacity of 98 mA h g−1 at 1 C and energy density of 82.6 W h kg−1.Two kinds of graphene-based composite materials of Ni(OH)2 nanoparticles/graphene sheets (Ni(OH)2/GS) and Bi2O3 rods/graphene sheets (Bi2O3/GS) were respectively synthesized by chemical bath deposition. Morphological and structural analysis by field-emission scanning electron microscopy, transmission electron microscope, X-ray diffraction and X-ray photoelectron spectroscopy confirmed the successful composite of GS with the metal compounds. Then, a high performance Ni/Bi battery was designed and fabricated using the Bi2O3/GS hybrid material as negative electrode and Ni(OH)2/GS as positive electrode. As a result, this Ni/Bi battery delivers a high discharge capacity of 102 mA h g−1 at 1 C and good rate capability. A high energy density of 83.2 W h kg−1 is also achieved at a power density of 143 W kg−1 and can still maintain a high level of 60.1 W h kg−1 at 2609 W kg−1, illustrating that this Ni/Bi battery is a promising candidate as energy storage devices.

Composites of a nickel based compound incorporated with graphene sheets (NiBC–GS) are prepared by a simple flocculation, using hydrazine hydrate as flocculant and reductant, from a homogeneous intermixture of nickel dichloride and graphene oxide dispersed in N,N-dimethylformamide. Morphology, microstructure and thermal stability of the obtained products were characterized by field-emission scanning electron microscopy, X-ray diffraction and thermal gravimetric analysis. Furthermore, the electrochemical properties of NiBC–GS, as electrode materials for supercapacitors, were studied by cyclic voltammetry and galvanostatic charge/discharge in 2 mol L−1 KOH solution. It was determined that for NiBC–GS annealed at 250 °C, a high specific capacitance of 2394 F g−1 was achieved at a current density of 1 A g−1, with 78% of the value (i.e., 1864 F g−1) retained after 5000 times of repeated galvanostatic charge/discharge cycling. The high specific capacitance and available charge/discharge stability indicate the synthesized NiBC–GS250 composite is a good candidate as a novel electrode material for supercapacitors.Composites of a nickel based compound incorporated with graphene sheets (NiBC–GS) are prepared by simple flocculation from a homogeneous intermixture of nickel dichloride and graphene oxide dispersed in dimethylformamide using hydrazine hydrate, as flocculant. A high specific capacitance of 2394 F g−1 is achieved at a current density of 1 A g−1 for NiBC–GS annealed at 250 ̊C, with 78% of the value, i.e., 1864 F g−1, retained after 5000 times of repeated galvanostatic charge/discharge cycling.

•Bulk fluorinated graphite is effectively transformed into fluorescent fluorinated graphene quantum dots by a designed exfoliation and cutting process.•The fluorine contents and sizes of the obtained fluorinated graphene quantum dots can be tuned by adjusting the reaction conditions.•The obtained fluorinated graphene quantum dots exhibit uniform size, enjoy good solubility in water and display brightly blue emission.•Thin and transparent fluorinated graphene sheets can also be readily obtained by our method.Synthesizing fluorinated graphene quantum dots (FGQDs) has been a great challenge due to the chemically inert C-F bond, and few attempts have been made to prepare this material. In this article, a novel, mild and effective method to controllably prepare FGQDs with tunable fluorine coverage and size by employing commercial fluorinated graphite is developed. This method avoids the complex procedures of preparing fluorinated graphene and use of toxic gases, and can be realized under mild conditions. Moreover, the obtained FGQDs possess relatively uniform size, enjoy good solubility and stability in water and exhibit highly bright blue luminescence.

•Smartly designed 3D CoAl LDH@Ni(OH)2 NSAs have been successfully synthesized.•This hierarchical electrode represents enhanced supercapacitive performance.•The synergy and structural features account for the enhanced capacitive properties.Electrodes with novel hierarchical nanoarchitectures can offer many opportunities for achieving the enhanced performance in energy storage. Herein, we have designed and synthesized 3D hierarchical structures of CoAl LDH@Ni(OH)2 nanosheet arrays (NSAs) by a facile two-step route. Compared with the pristine CoAl LDH NSAs, the hierarchical CoAl LDH@Ni(OH)2 NSAs represents much better capacitive behaviors. Specifically, under the same test conditions, CoAl LDH@Ni(OH)2 electrode exhibits the maximum specific capacitance of 1528 F g−1 (by galvanostatic discharge at the current density of 5 mA cm−2 in 2 M KOH, based on the total mass; that for CoAl LDH NSAs is only 738 F g−1) and excellent cycling performance (retaining 92% of its original capacitance after 1300 times of cycling). Such enhanced supercapacitor performances can be attributed to the novel 3D architectures, which can benefit the full contact of the Ni(OH)2 layer with OH− in the electrolyte.

•Ni(HCO3)2/GS composites were prepared by a simple solvothermal method.•Ni(HCO3)2/GS composites exhibited good supercapacitive performance.•Ni(HCO3)2/GS2 presented the highest capacitance of 1200 F g−1 at 4 A g−1.In this work, a series of composites consisting of Ni(HCO3)2 and graphene nanosheets (GS) have been prepared by a facile solvothermal method, and then their application as electrode materials for supercapacitors has been investigated by cyclic voltammetry (CV) and galvanostatic charge–discharge tests. Morphological and structural analyses by field-emission scanning electron microscopy, high resolution transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy indicated that Ni(HCO3)2 particles deposited on the GS and formed a loosely packed microstructure, actualizing the successful combination of Ni(HCO3)2 particles with GS. Among the prepared composites, the sample of Ni(HCO3)2/GS2 exhibited the highest capacitance of 1200 F g−1 at a current density of 4 A g−1, illustrating that such composite is a promising candidate as electrode material for supercapacitors. Moreover, the Faradic redox mechanism of the Ni(HCO3)2/GS composite was further studied in virtue of XRD analysis, which revealed that the Ni(HCO3)2 phase could be quickly transformed into Ni(OH)2 phase by an electrochemically induced phase transformation process during the galvanostatic charge–discharge tests.

•Bi2S3–ZnS/GNs composite was synthesized via a facile hydrothermal method.•Bi2S3–ZnS/GNs nanocomposite had a high electrocatalytic activity, durability, and stability.•Bi2S3–ZnS/GNs were expected to be effective electrode material for formic acid oxidationGraphene nanosheets (GNs) coated with Bi2S3–ZnS (Bi2S3–ZnS/GNs) hybrid materials were synthesized via a facile solvothermal method. The obtained material was characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) measurements. It was revealed that the GNs were in a gauze-like morphology, and the Bi2S3–ZnS nanorods assembled into an echinus structure and attached onto the GNs. The electrochemical performances of the nanohybrids were investigated by cyclic voltammetry (CV) and charge/discharge techniques. It showed that the Bi2S3–ZnS/GNs nanocomposite had a high electrocatalytic activity, durability, and stability. Bi2S3–ZnS/GNs were expected to be an effective electrode material for formic acid oxidation.

In this paper, we report the obtention of graphene–cadmium sulfide (G/CdS) nanocomposites were successfully synthesized by the ethylene glycol assisted hydrothermal method. The structure and composition of the obtained nanocomposites were confirmed by means of X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) measurements. XRD patterns showed that the CdS nanospheres belong to hexagonal structure. SEM and TEM images suggested a homogeneous distribution of CdS nanospheres coated on the graphene sheets successfully. FT-IR and XPS analyses indicated that GO has been simultaneously reduced to graphene nanosheets during the deposition of CdS nanocomposite. Moreover, PL investigations demonstrated that the G/CdS nanocomposites displayed significant decrease in PL emission compared with the corresponding sphere-like CdS nanoparticles. The investigation gave a promise to the development of original yet highly efficient graphene oxide-based novel electrode material in optical detectors.

Casein phosphopeptides (CPPs) with abundant phosphoserine clusters can mediate hydroxyapatite (HA) nucleation and growth. In this work, a new type of CPPs-biofuctionalized graphene composite was synthesized by amidation reaction between CPPs and carboxyalated graphene (CGO). When immersed in stimulated body fluid (1.5 × SBF) at 37 °C for different periods, the CPPs layer on the composite facilitated efficient interaction between the CGO surface and mineral ions, which promoted HA nanoparticle formation and shortened mineralization time in comparison with pristine CGO. The synthesis of the composite mimicked the natural biomineralization of bone, demonstrating that CPPs can effectively improve the bioactivity of graphene and be useful for HA formation. The presented biocomposite may have potential biomedical applications in different areas.

In this work, we present a simple and feasible method with broad applicability for the in-situ reduction and assembly of graphene lubricant films on various substrates. We adopt graphene oxide hydrosol as the precursor solution and creatively introduce an adherent coating of polydopamine that can be firmly bonded onto a wide range of substrates and acts as an active transition layer and in-situ reducing agent, aiming at obtaining the reduced graphene oxide (rGO) films thereon without addition of exogenous reducing agent. Experimental results prove that rGO nanosheets have been successfully assembled onto the substrates and the in-situ synthesized rGO film presents excellent morphology, outstanding friction reduction and wear resistance properties.

A new class of multilayer films was constructed by electrostatic layer-by-layer self-assembly, using poly(sodium 4-styrenesulfonate) mediated graphene sheets (PSS-GS), manganese dioxide (MnO2) sheets, and poly(diallyldimethylammonium) (PDDA) as building blocks. UV-vis spectroscopy, field-emission scanning electron microscopy and X-ray photoelectron spectroscopy were used to characterize the microstructures and morphologies of the multilayer films. Capacitive properties of the synthesized multilayer film electrodes were studied using cyclic voltammetry and galvanostatic charge/discharge in 0.1 M Na2SO4 electrolyte. The specific capacitance of the ITO/(PDDA/PSS-GS/PDDA/MnO2)10electrode reached 263 F g−1 at a discharge current density of 0.283 A g−1; moreover, this film electrode also shows a good cyclic stability and high Coulombic efficiency. Anticipatedly, the synthesized multilayer films will find promising applications as a novel electrode material in supercapacitors and other devices in virtue of their outstanding characteristics of controllable capacitance, good cycle stability, low cost and environmentally benign nature.

Graphene/manganese dioxide (MnO2) composite papers (GMCP) are fabricated via a simple three-step route: preparation of graphene oxide/MnO2 composite (GOMC) dispersion, subsequent vacuum filtration of GOMC dispersion to achieve graphene oxide/MnO2 composite paper (GOMCP), and finally thermal reduction of GOMCP to generate GMCP. The morphology and microstructure of the prepared samples are characterized by field-emission scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, Fourier transformation infrared spectroscopy, thermal gravimetric analysis and X-ray photoelectron spectroscopy. Moreover, as a binder-free and flexible electrode material for supercapacitors, the electrochemical properties of the prepared GMCP are evaluated by cyclic voltammetry and galvanostatic charge/discharge tests. As a result, the specific capacitance of the GMCP with the MnO2 weight ratio of 24% (GMCP-24) reaches 256 F g−1 at a current density of 500 mA g−1 and also shows good cycle stability, indicating a promising potential application as an effective electrode material for supercapacitors.

Hydrothermally reduced graphene/MnO2 (HRG/MnO2) composites were synthesized by dipping HRG into the mixed aqueous solution of 0.1 M KMnO4 and 0.1 M K2SO4 for different periods of time at room temperature. The morphology and microstructure of the as-prepared composites were characterized by field-emission scanning electron microscopy, X-ray diffraction, Raman microscope, and X-ray photoelectron spectroscopy. The characterizations indicate that MnO2 successfully deposited on HRG surfaces and the morphology of the HRG/MnO2 shows a three-dimensional porous structure with MnO2 homogenously distributing on the HRG surfaces. Capacitive properties of the synthesized composite electrodes were studied using cyclic voltammetry and electrochemical impedance spectroscopy in a three-electrode experimental setup using 1 M Na2SO4 aqueous solution as electrolyte. The main results of electrochemical tests are drawn as follows: the specific capacitance value of HRG/MnO2–200 (HRG dipped into the mixed solution of 0.1 M KMnO4 and 0.1 M K2SO4 for 200 min) electrode reached 211.5 F g−1 at a potential scan rate of 2 mV s−1; moreover, this electrode shows a good cyclic stability and capacity retention. It is anticipated that the synthesized HRG/MnO2 composites will find promising applications in supercapacitors and other devices in virtue of their outstanding characters of good cycle stability, low cost and environmentally benign nature.

Flexible graphene sheet (GS)/polyaniline (PANi) nanofibers composite paper was prepared via a facile and fast two-step route composed of electrostatic adsorption between negatively-charged poly(sodium 4-styrenesulfonate) (PSS) mediated GS (coded as PSS-GS) and positively-charged PANi nanofibers and the follow-up vacuum filtration of the as-prepared PSS-GS/PANi nanofibers suspension. By observations of field emission scanning electron microscopy (FE-SEM) and high resolution transmission electron microscopy (HR-TEM), it is clearly seen that representative and highly ordered layered PSS-GS/PANi composite papers have been achieved and PANi nanofibers are coated by PSS-GS. In addition, the synthesized PSS-GS/PANi composite papers are also characterized by Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy, and the results further confirm the successful synthesis of PSS-GS/PANi composites and the existence of strong interaction between PSS-GS and PANi nanofibers. The most interesting thing is the effective synergy can remarkably improve electrochemical properties of GS by introducing PANi nanofibers, which can ascribe to high surface area of GS and good combination between PSS-GS and PANi nanofibers. The highest specific capacitance of the composites reaches 301 F/g. Thermogravimetry analysis (TGA) indicates that the thermal stability of the PSS-GS/PANi composites is obviously improved compared to the pure PSS-GS and PANi.

Taking advantage of the condensation between Si–OH of the hydroxylated octadecyltrichlorosilane (OTS) and C–OH on graphene oxide (GO) surface, we grafted OTS onto the GO-based dual-layer film, which was composed of GO outerlayer and (3-aminopropyl)triethoxysilane (APTES) self-assembled underlayer, on a Si substrate. Thus, a hydrophobic trilayer film coded as APTES-GO-OTS was prepared successfully. To confirm the chemical composition, structure, and morphology of the trilayer film, various means including water contact angle measurement, attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectrometry, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) were performed. Moreover, to investigate the tribological performances, the micro- and macrotribological experiments were conducted with AFM and a UMT tribometer. The results showed that the as-prepared trilayer film exhibited low adhesion and greatly reduced the friction force in both the micro- and macroscale. Therefore, such a trilayer film is suitable for an application in the lubrication and protection of nano/microelectromechanical systems (NEMS/MEMS).

Nanocomposite films of platinum nanoparticle-deposited expandable graphene sheet (Pt/EGS) are fabricated on conductive indium tin oxide glass electrodes via a “green” electrochemical synthetic route involving a series of electrochemical processes. The microstructure and morphology of the prepared film samples are characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, three-dimensional non-contact surface mapping, and field emission scanning electron microscopy. At the same time, the catalytic activity and stability of the Pt/EGS film for the oxidation of methanol are evaluated through cyclic voltammetry and chronoamperometry tests. The Pt nanoparticles in the Pt/EGS nanocomposite film are found to be uniformly distributed on the EGS. The as-synthesized Pt/EGS nanocomposite exhibits high catalytic activity and good stability for the oxidation of methanol, which may be attributed to its excellent electrical conductivity and the high specific surface area of the graphene sheet catalyst support.

Three-dimensional ordered mesoporous–macroporous bioactive glass (MMBG) was synthesized by a combination of surfactant and polystyrene bead templates, the sol–gel method, and the evaporation-induced self-assembly process. The incorporation of regular spherical macropores only slightly perturbed the mesoporous network. The bioactivity of the MMBG was assessed by its immersion in simulated body fluid for different lengths of time and the subsequent determination of hydroxycarbonate apatite formation. The synthesized MMBG displayed good in vitro bioactivity and may have potential applications in bone tissue engineering.

Reduced graphene oxide (RGO) sheets were covalently assembled onto silicon wafers via a multistep route based on the chemical adsorption and thermal reduction of graphene oxide (GO). The formation and microstructure of RGO were analyzed by X-ray photoelectron spectroscopy (XPS), attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, Raman spectroscopy, and water contact angle (WCA) measurements. Characterization by atomic force microscopy (AFM) was performed to evaluate the morphology and microtribological behaviors of the samples. Macrotribological performance was tested on a ball-on-plate tribometer. Results show that the assembled RGO possesses good friction reduction and antiwear ability, properties ascribed to its intrinsic structure, that is, the covalent bonding to the substrate and self-lubricating property of RGO.

We have successfully fabricated hybrid Co3O4@Au-decorated PPy core/shell nanowire arrays (NWAs) on Ni foam via in situ interfacial polymerization between HAuCl4 and pyrrole monomers. With the advantages of high electrochemical activity of each component and high electrical conductivity of the Au-decorated PPy layer, this hybrid electrode exhibits remarkable pseudo-capacitive behaviors. This facile synthesis method offers an attractive strategy to further improve the electrochemical performance of pseudo-capacitors, and it undoubtedly shows promising applications in electrochemical energy storage.

A new class of multilayer films was constructed by electrostatic layer-by-layer self-assembly, using poly(sodium 4-styrenesulfonate) mediated graphene sheets (PSS-GS), manganese dioxide (MnO2) sheets, and poly(diallyldimethylammonium) (PDDA) as building blocks. UV-vis spectroscopy, field-emission scanning electron microscopy and X-ray photoelectron spectroscopy were used to characterize the microstructures and morphologies of the multilayer films. Capacitive properties of the synthesized multilayer film electrodes were studied using cyclic voltammetry and galvanostatic charge/discharge in 0.1 M Na2SO4 electrolyte. The specific capacitance of the ITO/(PDDA/PSS-GS/PDDA/MnO2)10electrode reached 263 F g−1 at a discharge current density of 0.283 A g−1; moreover, this film electrode also shows a good cyclic stability and high Coulombic efficiency. Anticipatedly, the synthesized multilayer films will find promising applications as a novel electrode material in supercapacitors and other devices in virtue of their outstanding characteristics of controllable capacitance, good cycle stability, low cost and environmentally benign nature.

In this work, we present a simple and feasible method with broad applicability for the in-situ reduction and assembly of graphene lubricant films on various substrates. We adopt graphene oxide hydrosol as the precursor solution and creatively introduce an adherent coating of polydopamine that can be firmly bonded onto a wide range of substrates and acts as an active transition layer and in-situ reducing agent, aiming at obtaining the reduced graphene oxide (rGO) films thereon without addition of exogenous reducing agent. Experimental results prove that rGO nanosheets have been successfully assembled onto the substrates and the in-situ synthesized rGO film presents excellent morphology, outstanding friction reduction and wear resistance properties.

Graphene/manganese dioxide (MnO2) composite papers (GMCP) are fabricated via a simple three-step route: preparation of graphene oxide/MnO2 composite (GOMC) dispersion, subsequent vacuum filtration of GOMC dispersion to achieve graphene oxide/MnO2 composite paper (GOMCP), and finally thermal reduction of GOMCP to generate GMCP. The morphology and microstructure of the prepared samples are characterized by field-emission scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, Fourier transformation infrared spectroscopy, thermal gravimetric analysis and X-ray photoelectron spectroscopy. Moreover, as a binder-free and flexible electrode material for supercapacitors, the electrochemical properties of the prepared GMCP are evaluated by cyclic voltammetry and galvanostatic charge/discharge tests. As a result, the specific capacitance of the GMCP with the MnO2 weight ratio of 24% (GMCP-24) reaches 256 F g−1 at a current density of 500 mA g−1 and also shows good cycle stability, indicating a promising potential application as an effective electrode material for supercapacitors.