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Substitute of Expensive Pt with Improved electrocatalytic Performance and Higher Resistance to CO Poisoning for Methanol Oxidation: the Case of Synergistic Pt-Co_3O_4 Nanocomposite

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Nano-Micro Letters 2013年第4期5卷 296-302页

作者： Hongxiao Zhao Zhi Zheng Jing Li Huimin Jia Ka-wai Wong Yidong Zhang Woon Ming Lau Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials Xuchang University Chengdu Green Energy and Green Manufacturing R&D Center

In this paper, Pt-Co_3O_4 nanocomposite was synthesized by a sol gel process combined with electrodeposition method. Its electrocatalytic activity towards methanol oxidation was investigated at room temperature using cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and current density time curve. It is found that the resultant Pt-Co_3O_4 catalysts with minute amount of Pt exhibite attractive electrocatalytic activity for methanol oxidation reaction(MOR) but with a high resistance CO poisoning due to the synergistic effects from Pt and Co_3O_4. Together with the low manufacturing cost of Co_3O_4, the reported nanostructured Pt-Co_3O_4 catalyst is expected to be a promising electrode material for direct methanol fuel cells(DMFC).

关键词： Pt-Co3O4 nanocomposite MOR electrocatalytic activity

Increased Oxygen Evolution activity in pH-Universal Electrocatalyst: Urea-Modified NiFeCoCN Medium-Entropy Alloy

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Chinese Journal of Chemistry 2023年第23期41卷 3290-3298页

作者： Hongwei Lv Zhiguo Ye Feng Pei Xinyuan Peng Juntong Huang Duosheng Li Zhong Jin School of Material Science and Engineering Nanchang Hangkong University696#FengHeNan RoadNanchangJiangxi330063 China State Grid Jiangxi Electric Power Research Institute NanchangJiangxi330096 China MOE Key Laboratory of Mesoscopic Chemistry MOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu210023 China

The kinetic process of a slow oxygen evolution reaction (OER) always constrains the efficiency of overall water electrolysis for H2 *** particular,nonprecious metal electrodes for the OER have difficulty in possessing excellent electrocatalytic activity and stability in pH-universal media *** this work,urea is first used as a pore-forming agent and active C/N source to fabricate a nanoporous NiFeCoCN medium-entropy alloy (MEA) by high-temperature sintering based on the nanoscale Kirkendall *** NiFeCoCN MEA achieves an overpotential of 432 mV at a current density of 10 mA·cm^(-2) and a lower Tafel slope of 52.4 mV·dec^(-1) compared to the IrO_(2)/Ti electrode (58.6 mV·dec^(-1)) in a 0.5 mol/L H_(2)SO_(4) *** a 1 mol/L KOH solution,the NiFeCoCN MEA obtains an overpotential of 175 mV for 10 mA·cm^(-2) and a Tafel slope of 40.8 mV·dec^(-1),which is better than IrO_(2)/Ni *** work proves a novel strategy to design and prepare nanoporous MEA materials with desirable C/N species,which provides promising prospects for the industrial production of H2 energy.

关键词： Oxygen evolution reaction Medium-entropy alloy Urea electrocatalytic activity Stability

Highly active porous nickel-film electrode via polystyrene microsphere template-assisted composite electrodeposition for hydrogen-evolution reaction in alkaline medium

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Science China Chemistry 2015年第3期58卷 501-507页

作者： Yinliang Cao Haijing Liu Xin Bo Feng Wang State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical Technology

A highly porous nickel-film electrode with satisfactory mechanical strength was prepared by a facile vertical template-assisted composite electrodeposition method using polystyrene(PS) microspheres templates, with the aim of improving the electrocatalytic activity for the hydrogen-evolution reaction(HER). During the composite electrodeposition process, the hydrophobic PS microspheres were highly dispersed in the electrolyte with the help of a surfactant, and then co-deposited with Ni to form the film electrode. After removing the PS templates by annealing, a porous Ni film containing large amount of uniformly dispersed pores with narrow size distribution was obtained, and then applied as the electrode for the HER in an alkaline medium. As evidenced by the electrochemical analysis, the porous Ni film electrode exhibits higher catalytic activity as compared to a dense Ni film electrode and is superior to a Ni/Ru O2/Ce O2 commercial electrode. The effect of temperature on the catalytic properties of the porous Ni film electrode was also investigated; the activation energy was calculated as 17.26 k J/mol. The enhanced activity toward the HER was attributed to the improved electrochemical surface area and mass transportation facilitated by the high porosity of the synthesized Ni film electrode.

关键词： porous film electrode nickel electrodeposition electrocatalytic activity hydrogen evolution reaction

Science Letters:Anodic oxidation of salicylic acid at Ta/BDD electrode

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第9期8卷 1457-1461页

作者： ZHANG Juan CHEN Xue-ming YAO Pei-dong CHEN Guo-hua Environmental Engineering Department Zhejiang University Hangzhou 310027 China Chemical Engineering Department The Hong Kong Univet＇sity of Science and Technology. Clear Water Ba~ Kowloon Hong Kong China

Boron-doped diamond （BDD） film electrodes using Ta as substrates were employed for anodic oxidation of salicylic acid （SA）. The effects of operational variables including initial concentration, current density, temperature and pH were examined. The results showed that BDD films deposited on the Ta substrates had high electrocatalytic activity for SA degradation. There was little effect ofpH on SA degradation. The current efficiency （CE） ,aas fbund to be dependent mainly on the initial SA concentration, current density and temperature. Chemical oxygen demand （COD） was reduced from 830 mg/L to 42 mg/L under a current density of200A/m^2 at 30℃.

关键词： Salicylic acid (SA) Anodic oxidation Ta/BDD Current efficiency (CE) electrocatalytic activity

Hydrogen Storage Alloy and Carbon Nanotubes Mixed Catalyst in a Direct Borohydride Fuel Cell

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Journal of Materials Science & Technology 2011年第12期27卷 1089-1093页

作者： Sai Li Xiaodong Yang Haiyan Zhu Yan Liu Yongning Liu State Key Laboratory for-Mechanical Behavior of Materials School of Materials Science and Engineering Xi＇an Jiaotong University Xi＇an 710049 China Department of chemistry and chemical Engineering Weinan Normal University Weinan 714000 China

In this study, carbon nanotubes （CNTs） were mixed with ABs-type hydrogen storage alloy （HSA）, as catalyst for an anode in a direct borohydride fuel cell （DBFC）. As comparision, a series of traditional carbon materials, such as acetylene black, Vulcan XC-72R, and super activated carbon （SAC） were also employed. Electrochemical measurements showed that the electrocatalytic activity of HSA was improved greatly by CNTs. The current density of the DI3FC employing the HSA/CNTs catalytic anode could reach 1550 ***-2 （at -0.6 V vs the EIg/HgO electrode） and the maximum power density of 65 ***-2 for this cell could be achieved at room temperature. Furthermore, the life time test lasting for 60 h showed that the cell displayed a good stability.

关键词： Direct borohydride fuel cell Carbon nanotubes Hydrogen storage alloy electrocatalytic activity

Synthesis, Crystal Structural Characterization and Electrochemical Properties of a 1D Tape-like Polymer of Cobalt Adamantanedicarboxylate: [Co_2(adc)_2(py)_4(H_2O)]_n

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Chinese Journal of Structural Chemistry 2011年第9期30卷 1305-1311页

作者：李红梅熊红波骆耿耿戴劲草 Institute of Materials Physical Chemistry Huaqiao University

The new complex, [Co2（adc）2（py）4（H2O）}n 1 （adc = 1,3-adamantanedicarboxylate, py = pyridine）, has been hydrothermally synthesized as polymeric solid, and characterized by X-ray diffraction, elemental analysis, IR spectra and thermogravimetric analysis. Complex 1 crystallizes in monoclinic, space group C2/c with a = 18.932（4）, b = 19.779（4）, c = 12.352（3） , β = 112.03（3）o, V = 4288（2） 3, Z = 4, GOF = 0.998, R = 0.0518 and wR = 0.1074. X-ray single-crystal analysis reveals that 1 presents a 3D simple parallel rod-like supramolecular array constructed by 1D tape-like polymeric motif through aromatic π-π stacking interaction. Electrochemical investigation shows that 1 exhibits appreciable electrocatalytic activity for the reduction reaction of nitrite.

关键词： coordination polymer supramolecular array electrocatalytic activity

INVESTIGATION OF SURFACE MORPHOLOGY, STRUCTURE AND electrocatalytic PROPERTIES FOR O_2 EVOLUTION OF TITANIUM BASED IrO_2+Ta_2O_5 COATINGS

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Acta Metallurgica Sinica(English Letters) 2000年第3期13卷 849-856页

作者： J.M Hu J.X. Wu H.M Meng YR. Zhu D.B. Sun and D.J. Yang(Beijing Corrosion and Protection Center, Open Laboratory of Corrosion, Erosion and Surface Technology,University of Science and Technology Beijing, Beijing 100083, China) Univ of Science and Technology Beijing Beijing China

Titanium based IrO2 +Ta2O5 oxide anodes with different compositions and pyrolysis temperatures were prepared by termodecompoisition method. By using X-ray diffraction (XRD), the structure and texture coefficient of the coatings, TC(hkl), of IrO2 rutile crystal have been tested. It showed that, the crystallization processes of IrO2 and Ta2O5 in xIrO2 +(100-x) Ta2 O5 (x is in mol%) films affected and confined each *** the mixed system, IrO2 rutile phase existed as a solid solution with Ta, and attained the maximum solubility when x=70mol%, i.e. for the coating of 70% IrO2 +*** the coatings of low iridium content or at low preparing tem pemture, (110) and (101) pwtered orientations were dominant. However, preferred growth of IrO2 weakened with increasing either iridium content or temperature. Three typical surface morphologies were observed by using scanning electron tnicroscopy(SEM). The crystallite size of the mixed oxide coatings were finest for the the film of 70%IrO2 +30%Ta2O5,and decreased with the pyrolysis tempemture. As the results of the finest crystallite segregating on sudece and the maxitnum solid solubility of Ir and Ta component in deposits, the coatings with the composition of 70%IrO2 +Ta2O5 prepared at 450℃ presented the mdrimutn electrocatalgtic activitg for O2 evolution in 0. 5M H2SO4 *** to 550℃, Ti base suffered to oxidation resulting in decreasing anode conductivity,therefore, coatings performed a low activity.

关键词： titanium based coating anode iridium oxide tantalum oxide,solid solution crystallite orientation electrocatalytic activity

Synthesis of monodisperse palladium nanocubes and their catalytic activity for methanol electrooxidation

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Chinese Physics B 2010年第10期19卷 370-374页

作者：丁皓时雪钊申承民惠超徐梽川李晨田园王登科高鸿钧 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences

The single crystalline palladium nanocubes with an average size of 7 nm were prepared in the presence of poly （vinyl pyrrolidone）（PVP） and KBr using the polyol method. The as-prepared Pd nanocubes were highly uniform in both size and shape. The ordered packing structures including monolayer and multilayer can be fabricated via the rate-controlled evaporation of solution solvent. The electrochemical catalytic activity of these Pd nanocubes towards methanol oxidation was found to be higher than that of spherical Pd nanoparticles of similar size.

关键词： Pd nanocubes electrocatalytic activity methanol oxidation fuel cell

Pt nanodendrites with (111) crystalline facet as an efficient, stable and pH-universal catalyst for electrochemical hydrogen production

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Chinese Chemical Letters 2020年第9期31卷 2478-2482页

作者： Huifang Sun Qi Zeng Chen Ye Yangguang Zhu Feiyue Chen Mingyang Yang Li Fu Shiyu Du Jinhong Yu Nan Jiang Jianxiong Liu Tianzhun Wu Cheng-Te Lin Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and Engineering(NIMTE)Chinese Academy of Sciences.Ningbo 315201China Shenzhen Institutes of Advanced Technology Chinese Academy of ScienceShenzhen 518055China Center of Material Science and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Laboratory of Environmental Biotechnology School of Environmental and Civil EngineeringJiangnan UniversityWuxi 214122China College of Science Henan University of TechnologyZhengzhou 10463China College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhou 310018China Ningbo Institute of Materials Technology and Engineering(NIMTE) Chinese Academy of SciencesNingbo 315201China

High-performance nanomaterial catalysts for hydrogen evolution reaction via electrochemical water splitting are significant to the development of hydrogen *** this work,we report a robust and highly active catalyst fabricated through direct electrochemical deposition of Pt nanodendrites at the surface of activated carbon(Pt NDs).Owing to the large elect roc he mically active area and the exposed(111) facet of Pt,Pt NDs exhibits outstanding activity towards hydrogen evolution reaction with a low requiring overpotential of 0.027 V at 10 mA/cm2 and Tafel slope of ≈22 mV/dec in acidic *** addition,the hydrogen yield of Pt NDs is 30%-45% larger than that of commercial Pt/C at the same Pt ***,Pt NDs exhibits excellent lo ng-term durability whose hydrogen production efficiency remains unchanged after six-hour hydrogen production,while the efficiency of commercial Pt/C catalyst decayed 9% under the same *** the superiority of catalytic activity and stability,this Pt NDs present great potentiality towards practical hydrogen production application.

关键词： Platinum nanodendrites Hydrogen evolution reaction electrocatalytic activity Long-term durability pH-universal property