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Facile synthesis and enhanced catalytic activity of electrochemically dealloyed platinum–nickel nanoparticles towards formic acid electro-oxidation

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Journal of Energy Chemistry 2019年第8期28卷 9-16,I0001页

作者： Maryam Kiani Jie Zhang Yan Luo Yihan Chen Jinwei Chen Jinlong Fan Gang Wang Ruilin Wang College of Materials Science and Engineering Sichuan University

To obtain the electrocatalyst with an improved electrocatalytic performance towards formic acid electrooxidation(FAEO), a simple impregnation method is used to prepare Pt3Ni nanoparticles loaded on carbon black, assisted with electrochemically dealloying process. The X-ray powder diffraction(XRD) results as well as transmission electron microscopy(TEM) analysis of as-synthesized electrocatalyst demonstrates that the reduction temperature has a great influence on the FAEO activity of the dealloyed Pt3Ni nanoparticles. X-ray photoelectron spectroscopy(XPS) analyses confirm the variation in the electronic structure of platinum by incorporation of nickel atoms which reduces chemisorption of toxic carbon monoxide and promotes the dehydrogenation pathway of FAEO. The size of the dealloyed Pt3Ni nanoparticles remains within the range of about 2.7 nm. All electrochemical results illustrate that the performance of the asobtained electrocatalyst towards the FAEO is significantly enhanced. Moreover, the carbon black content,incorporation of Ni atoms, and reduction temperature conditions have been proven to be the key factors for modification of the crystal structure and morphology which leads to enhanced catalytic performance.

关键词： Formic acid electro-oxidation electrocatalysis Pt3Ni nanoparticles Dealloying Dehydrogenation pathway

Preparation and application of ZnO doped Pt-CeO2 nanofibers as electrocatalyst for methanol electro-oxidation

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Journal of Rare Earths 2018年第9期36卷 974-980页

作者： Yingping Zheng Xin Zhang Zhengying Zhang Ying Li Yueming Sun Yongbing Lou Xiaojun Li Yang Lu College of Chemistry and Chemical Engineering Southeast University Nanjing 211189 China Experimental Testing Center of Hefei Guoxuan High-Tech Power Energy Company Limited Hefei 230011 China

ZnO doped Pt/CeO2 nanocomposites were prepared by electrospinning and reduction impregnation.Xray diffraction（XRD）,transmission electron microscopy（TEM）,energy disperse spectroscopy（EDS） and X-ray photoelectron spectroscopy（XPS） were employed to characterize the nanocomposites.It is observed that ZnO and CeO2 form the hexagonal wurtzite phase and cubic fluorite phase in the nanocomposite,respectively,whilst Pt nanoparticles（NPs） with the number-averaged size of ca.3.1 nm are uniformly distributed on the surface of nanofibers.The mass fraction of Pt NPs in the nanocomposites is about 10 wt%.The doping of ZnO is effective to promote reactive oxygen species,surface reaction sites and the interaction between Pt and oxides.The catalytic performance of nanocomposites was evaluated by the methanol electro-oxidation.indexed with the catalytic activity,stability of catalyst.As a result,it is found that the nanocomposite exhibits much higher activity and stability for methanol oxidation than the undoped Pt/CeO2 catalyst.

关键词： electrospinning Nanofibers Methanol electro-oxidation Rare earths

electro-oxidation of mixed reactants of ethanol and formate on Pd/C in alkaline fuel cells

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Journal of Energy Chemistry 2016年第4期25卷 683-690页

作者： Myounghoon Choun Jaeyoung Lee electrochemical Reaction and Technology Laboratory School of Environmental Science and Engineering GIST Ertl Center for electrochemistry and Catalysis Research Institute for Solar and Sustainable Energies (RISE) GIST

Direct ethanol fuel cells have attracted attention as an alternative energy technology due to several advantages such as high theoretical energy density and abundant supply of ethanol.In spite of the advantages,commercialization of direct ethanol fuel cells is hampered by the relatively low performance caused by its slow oxidation kinetics and difficulty of complete oxidation.In this study,formate,which has relatively faster oxidation kinetics,was mixed with ethanol to compensate the latter’s sluggish kinetics.Effects of p H,concentration,scan rate,and temperature on the mixed reactants oxidation on Pd were investigated by electrochemical experiments such as potential sweep and potentiostatic methods.Furthermore,the potential of the mixed reactants as fuel was evaluated by single cell experiments.As a result,we demonstrate that mixing formate with ethanol results in enhanced power performance in a single cell system.

关键词： Ethanol Formate Mixed reactants Alkaline media Palladium electro-oxidation

Lanthanum-dopedα-Ni(OH)_(2)1D-2D-3D hierarchical nanostructures for robust bifunctional electro-oxidation

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Particuology 2021年第4期19卷 104-111页

作者： Zimeng Wei Wenbin Sun Shanshan Liu Jindi Qi Luyao Kang jiechen Li Shanshan Lou Junfeng Xie Bo Tanga Yi Xie College of Chemistry Chemical Engineeringand Materials ScienceKey Laboratory of Molecular and Nano Probes(Ministry of Education)Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of ShandongInstitute of Molecular and Nano ScienceShandong Normal UniversityJinan 250014PR China College of Chemical Engineering and Safety Binzhou UniversityBinzhou 256603PR China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026PR China

The development of advanced electrocatalysts for electro-oxidation reactions has attracted much attention because of the critical role of such electrocatalysts in improving the overall efficiency of coupled hydrogen production.We have developed an efficient lanthanum-dopedα-Ni(OH)_(2) bifunctional catalyst with a 1D-2D-3D hierarchical nanostructure.It shows superior activity and stability in the anodic oxygen evolution reaction(OER)and urea oxidation reaction(UOR).Enrichment of the edge sites and conducting La doping inα-Ni(OH)_(2) phase enable formation and stabilization of abundant local Ni^(3+)ions.This guarantees ultralow onset potentials in electro-oxidation reactions.The 1D-2D-3D hierarchical nanostructure significantly boosts the in situ generation of high-valence active species,which results in efficient and stable OER and UOR performances,and the synergistic merit of doping-induced facile reaction kinetics.Because of the structural benefits of a large surface area,charge-transfer promotion,good structural stability,and bifunctionality,a 1%La-dopedα-Ni(OH)_(2) hierarchical nanostructure gives superior OER and UOR performances with low overpotentials,large catalytic current densities,and excellent operational stability.It is therefore a promising catalyst for use in simultaneous alkaline wastewater treatment and hydrogen production.

关键词： electro-oxidation Urea oxidation reaction(UOR) Oxygen evolution reaction(OER) Doping Hierarchical nanostructure

electro-oxidation of Ascorbic Acid on PVP-stabilized Graphene electrode

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Chemical Research in Chinese Universities 2010年第2期26卷 287-290页

作者： HAN Dong-fang SHAN Chang-sheng GUO Li-ping NIU Li HAN Dong-xue State Key Laboratory of electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China Department of Chemistry Northeast Normal University Changchun 130024 P. R. China

Polyvinylpyrrolidone-stabilized graphene（PVP-graphene） was synthesized and investigated as a modifier for the determination of ascorbic acid（AA）. With PVP acting as stabilizer and dispersant, the resulting PVP-graphene material could disperse well into water. And the PVP-graphene modified glassy carbon electrode（PVP-graphene-GCE） showed an obvious electrocatalytical activity toward the oxidation of AA in a phosphate buffer solution（PBS, pH=7.0） with an oxidation potential of AA at 0.052 V vs. AglAgCl（sat. KCl）. The calibration curve for APt was linear in a concentration range from 1.0×10^-5 to 5.0×10^-4 mol/L with a correlation coefficient of 0.9998. And the detection limit was found to be 1 μtmol/L. During the oxidation of AA, the π-π interaction of graphene plane with conjugated hexenoic aeid-lactone in AA molecules might play a key role. As a result, an obvious decrease of overpotential was achieved at such a PVP-graphene electrode through a possible adsorption/enrichment process, which will probably trigger potential applications for the electroanalysis of some aromatic and heterocyclic compounds.

关键词： Graphene Polyvinylpyrrolidone electro-oxidation Ascorbic acid

Cobalt phthalocyanine-graphene complex for electro-catalytic oxidation of dopamine

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Journal of Natural Gas Chemistry 2012年第3期21卷 265-269页

作者： Jinghe Yang Di Mu Yongjun Gao Juan Tan Anhui Lu Ding Ma Faculty of Chemical Environmental and Biological Science and technologyDalian University of TechnologyDalian 116024LiaoningChina Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Cobalt phthalocyanine-graphene （CoPc-Gr） complex are fabricated through 7r-Tr interaction of each components, with CoPc adsorbed/inserted on/in the graphene sheets. The obtained complex could be used in the electro-chemical detection of various medicines. CoPc-Gr modified glassy electrode shows excellent response to the electro-oxidation of dopamine （DA） and ascorbic acid （AA）, much better than those of CoPc, graphene oxide （GrO） or graphene （Gr） modified electrode. Significantly, the detection of dopamine is a diffusion-controlled process, highly selective, and has a low detection limit and broad linear range.

关键词： cobalt phthalocyanine-graphene dopamine electro-oxidation selective detection

Preparation of Platinum Implanted Glassy Carbon electrode and electro-oxidation of Formic Acid and Formaldehyde

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Chinese Chemical Letters 2000年第1期11卷 71-74页

作者： Cun Zhong ZHANG Jing YANG Xiao Lin LU Zhong Da WU( Department of Chemistry, Beijing Normal University, Beijing 100875) Department of Chemistry Beijing Normal University Beijing 100875 China

The glassy carbon substrates were bombarded with 5 X 10(17) ions/cm(2) of platinum. The surface composition of implanted electrode and concentration-depth profiles of various elements were measured by AES. The chemical state of Pt in glassy carbon electrode implanted with platinum (Pt/GC) was detected by X-ray Photoelectron Spectroscopy (XPS). The electro-oxidation of HCOOH and HCHO have been investigated on Pt/CC and smooth Pt electrodes. The results show that the platinum implanted into glassy carbon is much more active than the smooth platinum metal for electro-oxidation of HCOOH and HCHO.

关键词： ion implantation electro-oxidation formic acid formaldehyde

MECHANISM OF GLUCOSE electro-oxidation: VOLTAMMETRIC AND in-situ FTIR REFLECTANCE SPECTROSCOPIC STUDIES

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Chinese Science Bulletin 1992年第12期37卷 997-1001页

作者：吴辉煌孙世刚 Department of Chemistry Xiamen University Xiamen 361005 PRC State Key Laboratory for Physical Chemistry of the Solid Surface Xiamen 361005 PRC

In connection with the development of the implantable biocell for a cardiac pacemaker and the sensor for an artificial pancreas, much attention has been paid to the studies of glucose electro-oxidation. However, the mechanistic aspects still remain debatable, since most of the experiments are based only on conventional electrochemical techniques and the information about the electrode reaction in molecular level is in lack. In the present note, be-

关键词： glucose electro-oxidation electrochemical in-situ IR reflectance spectroscopy

Size-effect on Ni electrocatalyst:The case of electrochemical benzyl alcohol oxidation

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Nano Research 2023年第1期16卷 202-208页

作者： Jian Zhong Yongli Shen Pei Zhu Shuang Yao Changhua An Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringTianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials&Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China

The nanoparticles(NPs)of Ni with different sizes endows its distinctive physical and chemical properties,which represents a typical strategy for the development of high-performance catalysts.However,the size effect of metallic Ni-NPs on electrocatalytic performance remains ambiguous.Herein,the Ni-NPs with different sizes supported on nitrogen doped carbon(NC)has been synthesized by controlling the pyrolysis temperature,leading to the synthesis of Ni@NC-500(8.3 nm),Ni@NC-280(1.9 nm)and Ni@NC-200(1.0 nm).The electrooxidation of benzyl alcohol(BA)over these nanocatalysts shows the yield of benzoic acid was 99%,82%,55%on Ni@NC-280,Ni@NC-200 and Ni@NC-500,respectively.The experimental and theoretical simulation demonstrate that the difference in the adsorption strength of reactant molecules by Ni-NPs is responsible for their different performance,where the Ni@NC-280 exhibits an optimal adsorption configuration between Ni@NC-280 electrode and BA.This work provides a new angle for designing and synthesizing efficient electrocatalysts,which may be extended to the exploration of various promising electrocatalytic systems.

关键词： size effect electro-oxidation Ni nanoparticles benzyl alcohol