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Influence of N doping and the functional groups of graphene on a RGO/TiO2 composite photocatalyst

Science China(Technological Sciences) 2020年第6期63卷 1045-1054页

作者： TANG Bo HE YanFeng ZHANG ZhenYu WANG ZhengWei JI Li MA TingTing LI Sen DAI YuanZhe ZHANG GuoLiang School of Petroleum Engineering Changzhou UniversityChangzhou 213016China

Reduced graphene oxide(RGO)assisted TiO2 composite photocatalysts have attracted increased attention because of their high photocatalytic performance under both UV-and visible-light ***,the corresponding properties under the long wavelength irradiation is far from *** this study,a series of RGO samples with well-designed N impurity and optimized surface functional groups are prepared and employed during hybridization with TiO2(named N-RGO/TiO2).The coupling between the doped N atoms and surface functional groups is analyzed based on the resulting photocatalytic performances,and the specific mechanism is revealed by the EPR,IR and lifetime of the photoinduced *** comparing the corresponding performances of the RGO/TiO2 and RGO/N-TiO2 specimens,the results show that the surface functional groups of the RGO serve as a precondition to achieveπ-d coupling between the graphene basal plane and TiO2 nanoparticles,while N atoms in the RGO enhance the resulting photoactivity under a long wavelength range(>510 nm).The findings provide a potential approach to promote the photocatalytic properties of graphene-based composite photocatalysts with the low-energy incident photons.

关键词： graphene surface functional group N doping coupling photocatalyst

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surface carboxyl groups enhance the capacities of carbonaceous oxygen electrodes for aprotic lithiumoxygen batteries: A direct observation on binder-free electrodes

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Chinese Chemical Letters 2019年第12期30卷 2328-2332页

作者： Ming Li Liang Xiao Duo Wang Haoyang Dong Bohua Deng Jinping Liu School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

In order to achieve the high capacities of carbonaceous oxygen diffusion electrodes for aprotic lithiumoxygen batteries(Li-O2 batteries),most efforts currently focus on the design of rational porous *** few works study the surface chemistry effect that might be a critical factor influencing the capacities of carbonaceous *** addition,the surface chemistry effect is very difficult to be studied in composite electrodes due to the influences of binders and ***,we propose chemically activated carbon cloth(CACC) as an ideal model to investigate the effect of surface functional groups on the discharge capacities of carbonaceous oxygen electrodes for Li-O2 *** intrinsic surface chemistry effect on the performance of carbonaceous cathode is directly observed for the first time without the influences of binders and *** indicate that the surface carboxyl groups introduced by the chemical treatment not only function as the appropriate nucleation sites for Li2 O2 but also induce the formation of toroid-like Li2 ***,the surface carboxyl modification enhances the discharge capacities from 0.48 mAh/cm^2 of pristine carbon cloth to 1.23 mAh/cm^2 of *** work presents an effective way to further optimize the carbonaceous oxygen electrodes via surface functional group engineering.

关键词： surface functional group Chemically activated carbon cloth Carbonaceous oxygen electrode Specific discharge capacity Lithium-oxygen battery

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Characteristics of Chemical Modified Activated Carbons from Bamboo Scaffolding

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Chinese Journal of Chemical Engineering 2012年第3期20卷 515-523页

作者： W.H.Cheung S.S.Y.Lau S.Y.Leung A.W.M.Ip G.McKay Department of Chemical and Biomolecular Engineering the Hong Kong University of Science and TechnologyHong KongChina Scott Wilson Ltd 38th Floor MetroPlaza Tower 1Kwai FongHong KongChina

In this study, bamboo scaffolding was used to produce activated carbon by carbonization at 600 ℃ and 900 ℃with the purge of nitrogen. The 600 ℃ char was then further modified chemically by acids and alkalis by reflux for 6 hours. The produced chars were then characterized by nitrogen adsorption isotherm, He pyncometry, pH, elemental analysis and Boehm titration. For most of the chemically modified carbons, the micropore surface areas and volumes have increased compared with the 600 ~C char, while the mesopore surface areas and volumes slightly decreased, which may have been due to the dissolving of some of the permeated inorganic matter and oxidizing deposited carbon that blocks the pore openings. For the acidic modified carbons, larger amounts of acidic groups were present in the carbons after being activated by phosphoric acid, phosphoric acid furth, er treated with 2 mol-L-1nitric-acid, and calcium hydroxide. Although carbon treated with 2 mol.L-1 and 5 mol·L-1 nitric acid also produced high acidity, the surface areas and pore volumes were relatively low, due to the destruction of pores by nitric acid oxidation. The reduction of porosity may impair the adsorption capacity.

关键词： activated carbon bamboo surface area chemical activation porosity surface functional group

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