Co-reporter:Xuan Wang, Jin Zhou, Wei Xing, Boyu Liu, ... Shuping Zhuo
Journal of Energy Chemistry 2017 Volume 26, Issue 5(Volume 26, Issue 5) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.jechem.2017.07.010
Porous carbon spheres are prepared by direct carbonization of potassium salt of resorcinol–formaldehyde resin spheres, and are investigated as CO2 adsorbents. It is found that the prepared carbon materials still maintain the typical spherical shapes after the activation, and have highly developed ultra-microporosity with uniform pore size, indicating that almost the activation takes place in the interior of the polymer spheres. The narrow-distributed ultra-micropores are attributed to the “in-situ homogeneous activation” effect produced by the mono-dispersed potassium ions as a form of –OK groups in the bulk of polymer spheres. The CS-1 sample prepared under a KOH/resins weight ratio of 1 shows a very high CO2 capture capacity of 4.83 mmol/g and good CO2/N2 selectivity of ∼17–45. We believe that the presence of a well-developed ultra-microporosity is responsible for excellent CO2 sorption performance at room temperature and ambient pressure.Download high-res image (66KB)Download full-size imageMicroporous carbon materials are prepared by homogeneous in-situ activation method, and show very high CO2 capacity of 4.83 mmol g−1 and a good CO2/N2 selectivity of ∼17–45.
Co-reporter:Xiaozhong Wu, Jin Zhou, Wei Xing, Guiqiang Wang, Hongyou Cui, Shuping Zhuo, Qingzhong Xue, Zifeng Yan and Shi Zhang Qiao
Journal of Materials Chemistry A 2012 vol. 22(Issue 43) pp:23186-23193
Publication Date(Web):20 Sep 2012
DOI:10.1039/C2JM35278H
Graphene aerogel (GA) is successfully prepared through hydrogen reduction of graphene oxide aerogel (GOA) which is self-assembled from graphene oxide solution and subsequently dried by a supercritical CO2 method. The morphology, structure and surface property evolution in the preparation of GA are investigated intensively by a variety of means such as atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), N2 adsorption, X-ray diffraction (XRD), Raman spectroscopy, ultraviolet-visible absorption spectroscopy (UV-Vis), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). A self-assembly mechanism based on the hydrogen-bonding interactions between hydroxyl groups and carbonyl groups is proposed for the first time to explain the formation of GA. As evidenced by elemental analysis (EA) and electrochemical measurements, this three dimensional GA has an unprecedented high C/O molar ratio of 69.9, which contributes to the excellent high-rate performance of this material for supercapacitor applications.
Co-reporter:Guiqiang wang, Liang Wang, Wei Xing, Shuping Zhuo
Materials Chemistry and Physics 2010 Volume 123(2–3) pp:690-694
Publication Date(Web):1 October 2010
DOI:10.1016/j.matchemphys.2010.05.038
A novel carbon counter electrode for dye-sensitized solar cell was fabricated by coating the mesoporous carbon paste on fluorine-doped tin oxide glass substrate. Mesoporous carbon with pore size of 6.8 nm was distributed uniformly on the conductive substrate. The electrocatalytic activity of mesoporous carbon electrode for triiodide reduction was studied using electrochemical impedance spectroscopy. By optimizing the carbon loading and heating temperature, the charge-transfer resistance of 0.7 Ω cm2 for mesoporous carbon counter electrode was achieved. The short-circuit current density, the open-circuit voltage, the fill factor and the over-all conversion efficiency of dye-sensitized solar cell with mesoporous carbon counter electrode were 15.5 mA cm−2, 0.605 V, 65% and 6.18%, respectively.
Co-reporter:Xun Yuan, Wei Xing, Shu-Ping Zhuo, Weijiang Si, Xiuli Gao, Zhaohui Han, Zi-Feng Yan
Journal of Colloid and Interface Science 2008 Volume 322(Issue 2) pp:558-565
Publication Date(Web):15 June 2008
DOI:10.1016/j.jcis.2008.02.032
Ordered mesoporous carbons (OMCs) with varying pore sizes were prepared using ordered mesoporous silica SBA-15 as hard templates. The OMCs possess abundant mesopores with narrow pore size distribution, on which the adsorption behavior of bulky molecules of nonylphenol ethoxylate (NPE) were investigated. The isotherms of NPE on OMCs can be fitted by Langmuir adsorption model, evidenced by the adsorption data. The surface area of the pores larger than 1.5 nm is a crucial factor to the adsorption capacity of NPE, whereas the most probable pore diameter of OMCs is crucial to the adsorption rate of NPE. The adsorption temperature has more significant effects on adsorption rate than the adsorption capacity. Theoretical studies show that the adsorption kinetics of NPE on OMCs can be depicted with the pseudo-second-order kinetic model. In addition, thermodynamic parameters of adsorption were evaluated based on the equilibrium constants related to the equilibrium of adsorption at different temperatures.Adsorption isotherms of NPE over ordered mesoporous carbons.
Co-reporter:Shu-Ping ZHUO;Wei-Jiang SI;Ji-Chong WEI
Chinese Journal of Chemistry 2008 Volume 26( Issue 4) pp:621-626
Publication Date(Web):
DOI:10.1002/cjoc.200890117
Abstract
The correlation energy contribution of a polar group in a molecular system was defined and the contributions of HO, CH3, and CH2 groups in CH3(CH2)mOH (m=0–4) linear alkyl alcohols were calculated and studied at MP2-OPT2/6-311++G(d) level. It is revealed that the Ecorr(HO) and Ecorr(CH3) values of two terminal groups decrease somewhat with increase of number m in CH3(CH2)mOH (m=0–4) series. The value of Ecorr(CH2) in the α position is larger than those values of methylene groups in other positions in the same system, and the farther the CH2 from HO group in the molecule, the smaller the value of Ecorr(CH2) in CH3(CH2)mOH (m=1–4) systems. Therefore, it was predicted that with the increase of number m in CH3(CH2)mOH systems the values of Ecorr(CH2) that are those of CH2 groups relatively far from the terminal HO group would show a converging trend to that of a "standard" CH2 group and its value of Ecorr(CH2) would be transferable in CH3(CH2)mOH homologous systems. The excellent fitting relationships between the total correlation energy and the number of (m−1) where m is the number of methylene groups were obtained from both results at MP2-OPT2/6-311++G(d) level for CH3(CH2)mOH (m= 2–4) systems by Meld program and at MP2/6-311++G(d)//HF/6-311++G(d) level for CH3(CH2)mOH (m=2–7) systems by Gaussian 98 program, which show that the total correlation energy is a linear function of the number of (m−1).
Co-reporter:Xun Yuan, Shu-Ping Zhuo, Wei Xing, Hong-You Cui, Xiao-Dong Dai, Xin-Mei Liu, Zi-Feng Yan
Journal of Colloid and Interface Science 2007 Volume 310(Issue 1) pp:83-89
Publication Date(Web):1 June 2007
DOI:10.1016/j.jcis.2007.01.069
Ordered mesoporous carbons (OMCs) with varying pore size, and microporous carbon, CFY, were synthesized using ordered mesoporous silica SBA-15 and NaY zeolite as hard templates, respectively. N2 adsorption tests show that the synthesized OMCs possess abundant mesopores and centralized mesopore distribution. Methylene blue (MB) and neutral red (NR) were used as probe molecules to investigate their adsorption behaviors on OMCs and CFY. As evidenced by adsorption tests, the volume of mesopores of which the pore size is larger than 3.5 nm is a crucial factor for the adsorption capacity and adsorption rate of MB on OMCs. However, the most probable pore diameter of OMCs was found to be vital to the adsorption capacity and adsorption rate of NR. Theoretical studies show that the adsorption kinetics of MB and NR on OMCs can be well depicted by using pseudo-second-order kinetic model.
Co-reporter:Shu-Ping Zhuo;Ji-Chong Wei;Guan-Zhi Ju
Chinese Journal of Chemistry 2005 Volume 23(Issue 9) pp:
Publication Date(Web):12 OCT 2005
DOI:10.1002/cjoc.200591173
The calculation results of electron correlation energies of KF and (KF)2 were reported. The transferability of lsK2, lsF2 and the inner core correlation effects of K and F in both K, K+, KF and F, F-, KF systems were investigated respectively. The correlation energy contributions of K and F component to KF system were calculated. By applying the simple estimation scheme to the calculation of the correlation energy of the strong ionic compound KF and (KF) 2, it was shown that such a powerful scheme could not only reach the chemical accuracy but also need little computational work.
Co-reporter:Xiaozhong Wu, Jin Zhou, Wei Xing, Guiqiang Wang, Hongyou Cui, Shuping Zhuo, Qingzhong Xue, Zifeng Yan and Shi Zhang Qiao
Journal of Materials Chemistry A 2012 - vol. 22(Issue 43) pp:NaN23193-23193
Publication Date(Web):2012/09/20
DOI:10.1039/C2JM35278H
Graphene aerogel (GA) is successfully prepared through hydrogen reduction of graphene oxide aerogel (GOA) which is self-assembled from graphene oxide solution and subsequently dried by a supercritical CO2 method. The morphology, structure and surface property evolution in the preparation of GA are investigated intensively by a variety of means such as atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), N2 adsorption, X-ray diffraction (XRD), Raman spectroscopy, ultraviolet-visible absorption spectroscopy (UV-Vis), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). A self-assembly mechanism based on the hydrogen-bonding interactions between hydroxyl groups and carbonyl groups is proposed for the first time to explain the formation of GA. As evidenced by elemental analysis (EA) and electrochemical measurements, this three dimensional GA has an unprecedented high C/O molar ratio of 69.9, which contributes to the excellent high-rate performance of this material for supercapacitor applications.
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