Lihua Wang

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Name: 王丽华

Organization: Institute of Chemistry, Chinese Academy of Sciences , China

Department:

Title: Associate Researcher/Associate Professor(PhD)

Chemicals
References

Incorporation of metal-organic framework in polymer membrane enhances vanadium flow battery performance

Co-reporter:Shuai Liu, Xinxin Sang, Lihua Wang, Jianling Zhang, Jinliang Song, Buxing Han

Electrochimica Acta 2017 Volume 257(Volume 257) pp:

Publication Date(Web):10 December 2017

DOI:10.1016/j.electacta.2017.10.084

•Metal-organic framework is utilized for vanadium flow battery.•UiO-66 provide 0.55 nm ion channels and easy passage for the smaller proton.•Vanadium crossover is decreased due to size exclusion effect.•UiO-66 are functionalized to analyze the effect of functional groups.The metal-organic framework (MOF) is utilized as functional additive in non-perfluorinated polymer membrane for vanadium flow battery (VFB) application for the first time. The UiO-66 series can be easily modified to form suitable pore size distribution and are robust toward aqueous and acidic conditions. Owing to the different stokes radius of protons and vanadium ions, the additive micoporous UiO-66 series increase membranes’ proton selectivity effectively. Outstandingly, the VFBs with MOF-loaded polymer membranes exhibit higher coulombic efficiency and energy efficiency than those using neat polymer membrane and the perfluorinated Nafion 115 membrane at the same conditions. Moreover, the blend membranes present ultra-long self-discharge time up to 200 h and stable performance for 100 charge-discharge cycles without significant decline in energy efficiency. The MOF-loaded polymer membranes are promising for VFB applications due to the high efficiency, excellent stability, low cost and easy designation and functionality.Download high-res image (131KB)Download full-size image

Ethylenediamine-functionalized graphene oxide incorporated acid-base ion exchange membranes for vanadium redox flow battery

Co-reporter:Shuai Liu, Dan Li, Lihua Wang, Haijun Yang, Xutong Han, Biqian Liu

Electrochimica Acta 2017 Volume 230(Volume 230) pp:

Publication Date(Web):10 March 2017

DOI:10.1016/j.electacta.2017.01.170

•Ethylenediamine functionalized graphene oxide.•Layered structure of functionalized graphene oxide block vanadium ions crossover.•Protonated N-containing groups suppress vanadium ions permeation.•Ion transport channels are narrowed by electrostatic interactions.•Vanadium crossover decreased due to enhanced Donnan effect and special structure.As a promising large-scale energy storage battery, vanadium redox flow battery (VRFB) is urgently needed to develop cost-effective membranes with excellent performance. Novel acid-base ion exchange membranes (IEMs) are fabricated based on sulfonated poly(ether ether ketone) (SPEEK) matrix and modified graphene oxide (GO) by solution blending. N-based functionalized graphene oxide (GO-NH2) is fabricated by grafting ethylenediamine onto the edge of GO via a facile method. On one hand, the impermeable layered structures effectively block ion transport pathway to restrain vanadium ions crossover. On the other hand, acid-base pairs form between SO3− groups and N-based groups on the edge of GO nanosheets, which not only suppress vanadium ions contamination but also provide a narrow pathway for proton migration. The structure is beneficial for achieving an intrinsic balance between conductivity and permeability. By altering amounts of GO-NH2, a sequence of acid-base IEMs are characterized in detail. The single cells assembled with acid-base IEMs show self-discharge time for 160 h, capacity retention 92% after 100 cycle, coulombic efficiency 97.2% and energy efficiency 89.5%. All data indicate that acid-base IEMs have promising prospects for VRFB applications.Download high-res image (95KB)Download full-size image

Novel amphoteric ion exchange membranes by blending sulfonated poly(ether ether ketone)/quaternized poly(ether imide) for vanadium redox flow battery applications

Co-reporter:Shuai Liu, Lihua Wang, Dan Li, Biqian Liu, Jianjun Wang and Yanlin Song

Journal of Materials Chemistry A 2015 vol. 3(Issue 34) pp:17590-17597

Publication Date(Web):26 Jun 2015

DOI:10.1039/C5TA04351D

For vanadium redox flow battery (VRB) applications, novel amphoteric ion exchange membranes (AIEMs) are prepared using sulfonated poly(ether ether ketone) (SPEEK) and quaternized poly(ether imide) (QAPEI) by a facile method. Different from other AIEMs synthesized by multiple steps, SPEEK/QAPEI (S/Q) membranes are directly prepared by blending. It offers a reduction in cost and leads to a high degree of micro-phase separated structure which could facilitate ion transport. The mechanical properties, thermal stability and oxidative stability of S/Q blend membranes are examined. In addition, increasing the content of QAPEI in the blend membranes could reduce water uptake and vanadium ion permeability effectively and improve the proton selectivity. In VRB single cell tests, the VRBs with S/Q blend membranes show higher coulombic efficiency and energy efficiency (EE) than pristine SPEEK and Nafion 115 membranes. Furthermore, the blend membranes present stable performance up to 100 cycles without significant decline in EE. All experimental results indicate that the S/Q blend membranes show promising prospects for VRB applications.

Novel sulfonated polyimide/polyvinyl alcohol blend membranes for vanadium redox flow battery applications

Co-reporter:Shuai Liu, Lihua Wang, Bin Zhang, Biqian Liu, Jianjun Wang and Yanlin Song

Journal of Materials Chemistry A 2015 vol. 3(Issue 5) pp:2072-2081

Publication Date(Web):20 Nov 2014

DOI:10.1039/C4TA05504G

The synthesis and characterization of novel sulfonated polyimide (SPI)/polyvinyl alcohol (PVA) blend membranes for use in vanadium redox flow battery (VRB) are presented in this work. The SPIs with angled structure were synthesized using 4,4-oxydiphthalic anhydride (ODPA), sodium 2-aminosulphanilate (SAS) and 4,4′-diamino-3,3′-dimethyldiphenylmethane (DMMDA). The degree of sulfonation (DS) was regulated through variation of the molar ratio of SAS to DMMDA. The PVA/SPI blend membranes were prepared and applied in VRBs. Many basic properties of the membranes were characterized, particularly the water and oxidative stability. The blend membranes exhibit excellent water and oxidative stability. The proton conductivity, vanadium ion permeability and proton selectivity increase with DS due to the highly-dispersed phase-separated microstructure. In VRB single cell tests, the VRBs with blend membranes show lower charge capacity loss, higher coulombic efficiency (CE) and higher energy efficiency (EE) than with Nafion 117 membrane. Furthermore, the blend membranes present stable performances up to 100 cycles without significant decline in EE. All experimental results indicate that the blend membranes show promising prospects for application in VRBs.

pH responsiveness of two-layer nano-composite membrane with ultrathin cylindrical nanopores PS-b-P4VP film

Co-reporter:Shuai Liu, Lihua Wang, Biqian Liu, Yanlin Song

Polymer 2013 Volume 54(Issue 12) pp:3065-3070

Publication Date(Web):24 May 2013

DOI:10.1016/j.polymer.2013.04.024

In the present manuscript, we have demonstrated a new two-layer nano-composite membrane consisting pH-responsive nanoporous layer and a microporous membrane supporting layer. The nanoporous layer was a ca.30 nm thick film with cylindrical pores of diameter 30–50 nm, prepared by the polystyrene-block-poly(4-vinyl pyridine) copolymer (PS-b-P4VP) film. After spin-coating on silicon, this film was immersed into ethanol to generate pores. The nanoporous film was floated by buffered HF then combined with a microporous membrane to enhance mechanical strength. SFM, SEM and contact angle (CA) measurements were used to reveal structure of the block copolymer (BCP) film on silicon as well as the nano-composite membrane. Current–voltage measurements with different pH aqueous solution showed that transmembrane ionic current of this nano-composite membrane presented dramatically diversity at different pH. Confirmed by contact angle measurements, the wettability of the nanochannel is the key factor in this system. This work presents the first report on two layers nano-composite pH-responsive membrane with cylindrical porous ultrathin layer prepared by PS-b-P4VP surface reconstruction without any additional sacrificial components. This novel membrane can be widely used in medical examination, environmental monitoring and diaphragm cells.

Formation of honeycomb films based on a soluble polyimide synthesized from 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]hexafluoropropane dianhydride and 3,3-dimethyl-4,4-diaminodiphenylmethane

Co-reporter:Xutong Han;Ye Tian;Changfa Xiao

Journal of Applied Polymer Science 2008 Volume 107( Issue 1) pp:618-623

Publication Date(Web):

DOI:10.1002/app.27109

Abstract

A soluble polyimide was synthesized from 2,2′-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) and 3,3′-dimethyl-4,4′-diaminodiphenylmethane (DMMDA) by a two-step method, and it had good solubility both in strong bipolar solvents and in common low-boiling-point solvents. The BPADA–DMMDA polyimide was dissolved in chloroform (CHCl₃) and cast onto a glass substrate in a humid atmosphere. The BPADA–DMMDA/CHCl₃ solution easily formed honeycomb films. Some affecting factors, such as the polymer solution concentration, atmospheric humidity, and solvent volatility, were tested. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

Effects of nucleating agents on the porous structure of polyphenylene sulfide via thermally induced phase separation

Co-reporter:Xuntong Han;Huaiyu Ding;Changfa Xiao

Journal of Applied Polymer Science 2008 Volume 107( Issue 4) pp:2475-2479

Publication Date(Web):

DOI:10.1002/app.27255

Abstract

The different molecular weight Polyethylene glycol (PEG) was chosen to be the nucleating agent to investigate the effects of nucleating agents on the porous structure of polyphenylene sulfide (PPS) via thermally induced phase separation (TIPS). The pore structures were changed with the addition of PEG, due to the different mechanism on pattern formation. Moreover, some effecting factors, such as the molecular weight and concentration of PEG, were used to control the pore structure and size. With addition of nucleating agent, it can be estimated that the pore size (radius) should be about 0.5 ∼ 0.05 μm and the porosity should be above 70%. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

Porous honeycomb films prepared from poly (phthalazionone ether sulfone ketone) (PPESK) by self-organization method

Co-reporter:Youquan Zhang;Ye Tian

Journal of Applied Polymer Science 2008 Volume 109( Issue 3) pp:1524-1528

Publication Date(Web):

DOI:10.1002/app.28277

Abstract

Preparation of honeycomb-patterned films from Poly (phthalazionone ether sulfone ketone) (PPESK), one of the thermally stable polymers, in a humid atmosphere was reported in this article. The mechanism of forming honeycomb structure was discussed. Some influences, such as the effect of PPESK concentration and the atmosphere humidity were tested. Furthermore, the thermal stability of honeycomb-patterned films was also investigated, and it was shown that the honeycomb structures could be stable existed at 300°C. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

Ordered porous films based on fluorinated polyimide derived from 2,2′-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride and 3,3′-dimethyl-4,4′-diaminodiphenylmethane

Co-reporter:Xutong Han, Ye Tian, Lihua Wang, Changfa Xiao, Biqian Liu

European Polymer Journal 2007 Volume 43(Issue 10) pp:4382-4388

Publication Date(Web):October 2007

DOI:10.1016/j.eurpolymj.2007.06.043

One of fluorinated polyimides was synthesized from 2,2′-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) and 3,3′-dimethyl-4,4′-diaminodiphenylmethane (DMMDA) by two-steps method, which had good solubility and hydrophilicity. 6FDA-DMMDA polyimide was dissolved in chloroform (CHCl3) and cast on a glass substrate in a humid atmosphere. It was found that 6FDA-DMMDA/CHCl3 solution was easy to form ordered porous structure at high concentration, and the reason was discussed in detail. In addition, the influences of solution concentration, the atmosphere humidity, were also tested.

Preparation of ultrahigh-molecular-weight polyethylene membranes via a thermally induced phase-separation method

Co-reporter:Lihua Wang;Huaiyu Ding;Biqian Liu;Ye Tian

Journal of Applied Polymer Science 2007 Volume 105(Issue 6) pp:3355-3362

Publication Date(Web):30 MAY 2007

DOI:10.1002/app.26521

Porous, flat membranes of ultrahigh-molecular-weight polyethylene were prepared as thermally resistant and solvent-resistant membranes by the thermally induced phase-separation method. Diphenyl ether and decalin were chosen as the diluents. The phase diagrams were drawn with the cloud-point temperatures and the crystallization temperatures. According to the phase diagrams, scanning electron microscopy images, and porosities of the samples, the influential factors, including the polymer concentration, cooling rate, and viscosity, were investigated. Porous ultrahigh-molecular-weight polyethylene membranes with thermal and solvent resistance could be prepared with suitable diluents and cooling rates by the thermally induced phase-separation method. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007

Structure control of polyphenylene sulfide membrane prepared by thermally induced phase separation

Co-reporter:Huaiyu Ding;Ye Tian;Fuming Wang;Yanqiao Shi;Biqian Liu;Qiang Zhang

Journal of Applied Polymer Science 2007 Volume 105(Issue 6) pp:3280-3286

Publication Date(Web):24 MAY 2007

DOI:10.1002/app.26595

Porous membranes were prepared through thermally induced phase separation (TIPS) of polyphenylene sulfide (PPS)/diphenyl ketone mixtures. The phase diagram of PPS/diphenyl ketone system was drawn by cloud point temperature and dynamic crystallization temperature. SEM images and porosity were used to characterize PPS membrane structures. According to the analysis of phase diagram, three main effecting factors including polymer concentration, cooling rate, and nucleating agent could control the pore structure and pore size for the preparation of symmetry and asymmetry membranes. The experimental results are coincident with the theory prediction. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007

Microstructure and properties of organosoluble polyimide/silica hybrid films

Co-reporter:Lihua Wang, Ye Tian, Huaiyu Ding, Jiding Li

European Polymer Journal 2006 Volume 42(Issue 11) pp:2921-2930

Publication Date(Web):November 2006

DOI:10.1016/j.eurpolymj.2006.08.004

Organosoluble polyimide/silica hybrid materials were prepared via the sol–gel process and their pervaporation properties were studied. The organosoluble polyimide (PI) was based on 4,4′-oxydiphthlic dianhydride (ODPA) and 4,4′-diamino-3,3′-dimethyldiphenylmethane (DMMDA). The surface chemical structure of polyimide/silica films was analyzed by Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) and the results show that the completely hydrolysis of alkoxy groups of precursors and formation of the three-dimensional Si–O–Si network in the hybrid films. The morphology and the silica domain thus obtained were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM), respectively. The silica particle size in the hybrid is in the range of 40–100 nm for the hybrid films when the amount of silica is less than 20 wt%. The strength and the modulus of the hybrid films are improved and the mechanical properties were found to be strongly dependent on the density of the crosslink. The glass transition temperature (Tg) of the hybrid films was determined by dynamic mechanical analysis (DMA) and the value increased 15–20 °C as the silica content increased. Furthermore, the pervaporation performances of the prepared hybrid films were also investigated for the ethanol/water mixtures at different temperature.

Formation of Honeycomb-Patterned Polyetherketone Cardo (PEK-C) Films in a Highly Humid Atmosphere

Co-reporter:Ye Tian;Shuang Liu;Huaiyu Ding;Biqian Liu;Yanqiao Shi

Macromolecular Chemistry and Physics 2006 Volume 207(Issue 21) pp:

Publication Date(Web):30 OCT 2006

DOI:10.1002/macp.200600357

Summary: The fabrication of honeycomb-patterned films from PEK-C in a humid atmosphere is reported. Some governing factors, such as the concentrations of the polymer solutions, the atmosphere humidity, and the volatility of the solvents, are tested. Moreover, by using PEK-C, PLEG, and PPO, the different mechanisms between hydrophilic polymers and hydrophobic polymers on pattern formation are also studied.

Novel sulfonated polyimide/polyvinyl alcohol blend membranes for vanadium redox flow battery applications

Co-reporter:Shuai Liu, Lihua Wang, Bin Zhang, Biqian Liu, Jianjun Wang and Yanlin Song

Journal of Materials Chemistry A 2015 - vol. 3(Issue 5) pp:NaN2081-2081

Publication Date(Web):2014/11/20

DOI:10.1039/C4TA05504G

Novel amphoteric ion exchange membranes by blending sulfonated poly(ether ether ketone)/quaternized poly(ether imide) for vanadium redox flow battery applications

Co-reporter:Shuai Liu, Lihua Wang, Dan Li, Biqian Liu, Jianjun Wang and Yanlin Song

Journal of Materials Chemistry A 2015 - vol. 3(Issue 34) pp:NaN17597-17597

Publication Date(Web):2015/06/26

DOI:10.1039/C5TA04351D