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Enhanced electrocatalytic activity of carbon cloth by synergetic effect of plasma and acid treatment

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Plasma Science and Technology 2021年第2期23卷 57-63页

作者： Tingting MEI Ming GAO Danni LIU Yu WANG Yifan HUANG Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055People's Republic of China University of Chinese Academy of Sciences Beijing 100049People's Republic of China

Commercial carbon cloth(CC)is an ideal electrocatalysis material to produce oxygen evolution reaction(OER)due to its high conductive and 3D flexible structure,but the lacked active sites limit its *** improving its OER performance,the present study proposed an effective method combining plasma and acid treatment to introduce oxygen-containing functional groups and produce more active sites on its *** to the pristine CC,the plasma and acid treated carbon cloth(PN-CC)delivers a reduced overpotential by 34.6%to achieve current density of 10 mA cm^(−2).The Tafel slope declines from 97.5 mV dec^(–1)(pristine CC)to 55.9 mV dec–1(PN-CC),showing an increased OER ***,PN-CC electrocatalyst shows outstanding stability after 5000 cycles or 25000 *** combination of plasma and acid treatment shows a significant potential in surface modification for electrocatalysts.

关键词： carbon cloth electrocatalytic activity plasma treatment acid oxidation

electrocatalytic activity of Tungsten Carbide and Natural Zeolite Composite in Aqueous Solution

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Chinese Journal of Chemical Engineering 2012年第2期20卷 254-261页

作者：程媛谢伟淼姚国新胡素绢李国华 School of Chemical Engineering and Materials Science Zhejiang University of Technology State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology Research Center of Nanoscience and Technology Zhejiang University of Technology

Tungsten carbide and zeolite nanocomposite was prepared by combining a mechanochemical approach with a reduction and carbonization approach,using natural zeolite and ammonia metatungstate as *** sample was characterized by X-ray diffraction and scanning electron *** results showed that the crystal phase of the sample is composed of zeolite,monotungsten carbide and bitungsten *** mass percentage and the crystallite diameter of tungsten carbide change along with the reacted *** electrocatalytic activity was measured with a microelectrode system with three *** results show that its electrocatalytic property is related to its crystal phase and the mass percentage of tungsten carbide,and its electrocatalytic activity is connected with the property of electrolyte,in which it is *** effect between tungsten carbide and zeolite is found during electrocatalysis.

关键词： tungsten carbide zeolite nanocomposite electrocatalytic activity synergistic effect

MoSe2 porous microspheres comprising monolayer flakes with high electrocatalytic activity

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Nano Research 2015年第4期8卷 1108-1115页

作者： Yejun Zhang Qiufang Gong Lun Li Hongchao Yang Yanguang Li Qiangbin Wang Key Laboratory of Nano-Bio Interface Division of Nanobiomedicine and i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China Institute of Functional Nano & Soft Materials (FUNSOM) 5oochow University Suzhou 215123 China

A facile colloidal route to synthesize MoSe2 porous microspheres with diameters of 400-600 nm made up of MoSe2 monolayer flakes （-0.7 nm in thickness） is reported. The solvents trioctylamine （TOA） and oleylamine （OAM） are found to play important roles in the formation of MoSe2 microspheres, whereby TOA determines the three-dimensional （3D） microspherical morphology and OAM directs the formation of MoSes monolayer flakes. The robust 3D MoSe2 microspheres exhibit remarkable activity and durability for the electrocatalytic hydrogen evolution reaction （HER） in acid, maintaining a small onset overpotential of -77 mV and keeping a small overpotential of 100 mV for a current density of 5 mA/cm2 after 1,000 cycles. In addition, similar 3D WSe2 microspheres can also be prepared by using this method. We expect this facile colloidal route could further be expanded to synthesize other porous structures which will find applications in fields such as in energy storage, catalysis, and sensing.

关键词： MoSe2 transition-metalchalcogenides porous microspheres monolayer flakes electrocatalytic activity

Synergistic Effects in CNTs-PdAu/Pt Trimetallic Nanoparticles with High electrocatalytic activity and Stability

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Nano-Micro Letters 2017年第4期9卷 129-138页

作者： Xin-Lei Cai Chang-Hai Liu Jie Liu Ying Lu Ya-Nan Zhong Kai-Qi Nie Jian-Long Xu Xu Gao Xu-Hui Sun Sui-Dong Wang Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow University School of Materials Science and Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University

We present a straightforward physical approach for synthesizing multiwalled carbon nanotubes(CNTs)-Pd Au/Pt trimetallic nanoparticles(NPs), which allows predesign and control of the metal compositional ratio by simply adjusting the sputtering targets and conditions. The small-sized CNTs-Pd Au/Pt NPs(~3 nm, Pd/Au/Pt ratio of 3:1:2) act as nanocatalysts for the methanol oxidationreaction(MOR), showing excellent performance with electrocatalytic peak current of 4.4 A mg^(-1) Pt and high stability over 7000 s. The electrocatalytic activity and stability of the Pd Au/Pt trimetallic NPs are much superior to those of the corresponding Pd/Pt and Au/Pt bimetallic NPs,as well as a commercial Pt/C catalyst. Systematic investigation of the microscopic, crystalline, and electronic structure of the Pd Au/Pt NPs reveals alloying and charge redistribution in the Pd Au/Pt NPs, which are responsible for the promotion of the electrocatalytic performance.

关键词： CNTs PdAu/Pt Trimetallic nanoparticles Methanol oxidation reaction electrocatalytic activity Synergistic effects

Sonochemical Synthesis of Three-dimensional Aggregates of Pd Nanoparticles with High electrocatalytic activity Towards Ethanol Oxidation

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Chemical Research in Chinese Universities 2014年第2期30卷 320-325页

作者： WANG Yanli TAN Dexin School of Materials Science and Engineering Anhui University of Science and Technology Huainan 232001 P.R.China School of Chemical Engineering Anhui University of Science and Technology Huainan 232001 P.R.China

Flower-like aggregates composed of （4.0±0.8） nm palladium（Pd） nanoparticles were prepared via ultrasonics in the palladium（Ⅱ） chloride（PdCl2） H2O/EtOH（5/1,volume ratio） solution with the addition of a quantity of poly（vinyl pyrrolidone）（PVP） and sodium dodecyl sulfonate（SDS）.The morphologies,crystal structures and the optical properties of the flower-like Pd nanostructures were characterized by X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,selected area electron diffraction（SAED） and UV-visible absorption spectroscopy,*** mechanism of sonochemical reduction of Pd（Ⅱ） ions was also *** results show that the molar ratio of PVP to SDS affected the formation of the flower-like aggregates of Pd ***,the electrocatalytic properties of Pd aggregates modified glassy carbon electrode for ethanol oxidation were also investigated by cyclic voltammetry（CV）.This material exhibits remarkable electrocatalytic activity for ethanol oxidation in 1 mol/L KOH and appears as a promising candidate to be applied in direct ethanol fuel cells.

关键词： Aggregate Palladium Sonochemical synthesis electrocatalytic activity Ethanol

Electro-oxidation treatment of Sn/PANI electrode and electrocatalytic activity of Pt/Sn hydroxide/PANI composite electrodes

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Journal of Central South University of Technology 2008年第5期15卷 593-598页

作者：周海晖彭铮焦勇刚廖杰旷亚非 College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082 China

After being electro-oxidized by cyclic voltammetry(CV) method in 0.5 mol/L H2SO4 solution or in 0.2 mol/L H2O2+0.5 mol/L H2SO4 solution, the Sn/polyaniline (PANI) electrodes were modified with Pt microparticles by pulse galvanostatic method, thus Pt/Sn hydroxide/PANI electrodes were prepared. The electrocatalytic activities of the Pt/Sn/PANI electrode and Pt/Sn hydroxide/PANI electrode for formaldehyde electro-oxidation were investigated by CV method. The effects of deposition charges (Qdep) of PANI, Sn and Pt, scan rate and formaldehyde concentration on the electrocatalytic activity of Pt/Sn hydroxide/PANI electrode were also studied. The results show that the electrocatalytic activities of the Pt/Sn hydroxide/PANI electrodes are much higher than those of the Pt/Sn/PANI electrode.

关键词： Sn Sn hydroxide formaldehyde polyaniline electrocatalytic activity electro-oxidation

Polyporous C@WC_(1-x) composite and its electrocatalytic activity for p-nitrophenol reduction

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Chinese Chemical Letters 2011年第4期22卷 497-500页

作者： Hua Jun Zheng Ai Mei Yu Chun An Ma College of Application Chemistry Zhejiang University of Technology Hangzhou 310014 China

The polyporous carbon supported tungsten carbide（polyporous C@WC_（1-x）） composite was prepared using hexagonal silica MCM-41 as the hard template by raw material solution impregnation,mechanical milling and simultaneous reduction and carbonization by temperature programming in mixture gas（CH4/H2）.The structure and morphology of polyporous C@WC（1-x） composite were studied via X-ray diffraction,transmission electron microscopy and so *** electrocatalytic property was tested for the electroreduction of p-nitrophenol（PNP） in neutral *** revealed that the composite is consisted of polyporous carbon and nanocrystalline WC（1-x）,possessing good electrocatalytic activity in the reaction of PNP reduction.

关键词： Template method Polyporous carbon WC1-x electrocatalytic activity

Synthesis of Ruthenium Xanthate Complex and Its electrocatalytic activity for Tryptophan Oxidation

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Chemical Research in Chinese Universities 2013年第3期29卷 574-578页

作者： WU Fang-hui CHEN Le CHU Xiang-feng WEI Xian-wen School of Chemistry and Chemical Engineering Anhui University of Technology Maanshan 243002 P. R. China

A new ruthenium complex containing bidentate xanthate ligands was synthesized in a good yield. This complex was characterized by elemental analysis, proton nuclear magnetic resonance（tH NMR）, Fourier transform infrared（FTIR） and UV-Vis spectroscopies. The cyclic voltammetry of the complex revealed one quasi-redox wave centered at Ru（III）/Ru（II） couple, indicating its catalytic potential. So the preparation of a glass carbon electrode modified with ruthenium xanthate complex and its electrocatalytic activity toward the oxidation of tryptophan（Trp） were also studied. The experimental results show that the modified electrode had excellent electrocatalytic activity for the oxidation of tryptophan. Moreover, under the optimized conditions, the oxidation peak current was propor- tional to tryptophan concentration in a range of 2.5×10-7 to 5.0× 10-5 mol/L with a correlation coefficient of 0.9928 and a detection limit of 8.3 × 10-8 mol/L（S/N=3）. Using the proposed method, tryptophan was successfully determined in pharmaceutical samples with standard addition method.

关键词： Ruthenium xanthate complex electrocatalytic activity Tryptophan

Enhanced electrocatalytic activity for H_2O_2 production by the oxygen reduction reaction: Rational control of the structure and composition of multi-walled carbon nanotubes

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Chinese Journal of Catalysis 2019年第4期40卷 523-533,M0003页

作者： Yi Wang Mi Yi Kun Wang Shuqin Song The Key Lab of Low-carbon Chemistry & Energy Conservation of Guangdong Province School of Chemical Engineering and TechnologySun Yat-sen UniversityZhuhai 519082GuangdongChina School of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275GuangdongChina

Hydrogen peroxide(H2O2)is a very useful chemical reagent,but the current industrial methods for its production suffer from serious energy consumption *** high-activity and high-selectivity catalysts to electrocatalyze the oxygen reduction reaction(ORR)through a two-electron(2e^-)pathway is a very promising route to produce *** this work,we obtained partially oxidized multi-walled carbon nanotubes(MWCNTs)with controlled structure and composition by oxidation with concentrated sulfate and potassium permanganate at 40℃ for 1 h(O-CNTs-40-1).The outer layers of O-CNTs-40-1 are damaged with defects and oxygen-containing functional groups,while the inner layers are maintained *** optimized structure and composition of the partially oxidized MWCNTs ensure that O-CNTs-40-1 possesses both a sufficient number of catalytic sites and good *** results of rotating ring disk electrode measurements reveal that,among all oxidized MWCNTs,O-CNTs-40-1 shows the greatest improvement in hydrogen peroxide selectivity(from ~ 30% to ~ 50%)and electron transfer number(from ~ 3.4 to ~ 3.0)compared to those of the raw *** results of electrochemical impedance spectroscopy measurements indicate that both the charge-transfer and intrinsic resistances of O-CNTs-40-1 are lower than those of the raw MWCNTs and of the other oxidized ***,direct tests of the H2O2 production confirm the greatly improved catalytic activity of O-CNTs-40-1 relative to that of the raw MWCNTs.

关键词： Hydrogen peroxide Oxygen reduction reaction Multi-walled carbon nanotubes electrocatalytic activity Oxidation treatment