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Preparation and characterization of Pt-WO_3/C catalysts for direct ethanol fuel cells

Rare Metals 2010年第3期29卷 255-260页

作者： WU Feng LIU Yanhong WU Chuan School of Chemical Engineering and Environment Beijing Institute of Technology Beijing 100081 China National Development Center for High Technology Green Materials Beijing 100081 China

Three co-impregnation/chemical reduction methods in acidic solutions of pH 〈 1,including ethylene glycol （EG）,NaBH4,and HCOOH,were compared for Pt-WO3/C ***-WO3/C catalysts containing 10 wt.% and 20 wt.% platinum per carbon were prepared by the three methods; their morphology and electrocatalytic activities were *** 20 wt.% Pt-WO3/C catalyst prepared by the co-impregnation/EG method presented the optimal dispersion with an average particle size of 4.6 nm and subsequently the best electrocatalytic activity,and so,it was further *** anodic peak current density for ethanol oxidation from linear sweep voltammetry （LSV） is 7.9 mA·cm^-2,which is 1.4 and 5.2 times as high as those of the catalysts prepared by co-impregnation/NaBH4 and co-impregnation/ HCOOH reduction methods,2.1 times as high as that of the 10 wt.% Pt-WO3/C catalyst prepared by co-impregnation/EG method,respectively.

关键词： direct ethanol fuel cells catalysts preparation method characterization ethanol electrooxidation

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Synthesis of palladium-rare earth alloy as a high-performance bifunctional catalyst for direct ethanol fuel cells

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Nano Research 2024年第11期17卷 9525-9531页

作者： Qingqing Li Chang Sun Xiaolei Sun Zijun Yin Yaping Du Jin-Cheng Liu Feng Luo Tianjin Key Laboratory of Rare Earth Materials and Applications School of Materials Science and Engineering Center for Rare Earth and Inorganic Functional Materials Nankai University Tianjin 300350 China The Experimental High School Attached to Beijing Normal University Beijing 100032 China

direct ethanol fuel cells (DEFCs) have drawn attention for their simplicity, rapid start-up, high power density and environmental friendliness. Despite these advantages, the widespread application of DEFCs faces challenges, primarily due to the inadequate performance of anode and cathode catalysts. Pd-based materials have shown exceptional catalytic activity for both the ethanol oxidation reaction (EOR) and the oxygen reduction reaction (ORR). Alloying noble metals with rare earth elements has emerged as an effective strategy to further enhance the catalytic activity by modulating the electronic structure. In this study, we synthesized a series of palladium-rare earth (Pd3RE) alloys supported on carbon to serve as bifunctional catalysts that efficiently promote both ORR and EOR. Compared to Pd/C, the Pd3Tb/C catalyst exhibits 3.1-fold and 1.8-fold enhancement in activity for ORR and EOR, respectively. The charge transfer in the Pd3Tb/C results in an electron-rich Pd component, thereby weakening the binding energy with oxygen species and facilitating the two reactions.

关键词： rare earth alloy oxygen reduction reaction ethanol oxidation reaction direct ethanol fuel cells bifunctional electrocatalyst charge transfer

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Highly stable Pt_(3)Ni ultralong nanowires tailored with trace Mo for the ethanol oxidation

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Nano Research 2022年第4期15卷 3230-3238页

作者： Mingxuan Li Yandi Cai Jinjin Zhang Haixiao Sun Zhi Li Yujie Liu Xin Zhang Xiaoping Dai Fei Gao Weiyu Song State Key Laboratory of Heavy Oil Processing College of Chemical Engineering and EnvironmentChina University of PetroleumBeijing 102249China Jiangsu Key Laboratory of Vehicle Emissions Control School of the EnvironmentCenter of Modern AnalysisKey Laboratory of Mesoscopic Chemistry of MOESchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China Sinopec Zhenhai Refining&Chemical Company Ningbo 315207China

Pt_(3)Ni alloy structure is an effective strategy to accelerate ethanol oxidation reaction(EOR),while the stability in acid electrolyte is the fatal weakness and the current density still needs to be ***,ultralong Pt_(3)Ni nanowires tailored by trace Mo(Mo/Pt_(3)Ni NWs)were successfully synthesized by surfactant free *** specific activity of the optimized catalyst was 2.66 mA·cm^(-2),which is approximately 2.16 and 4.6-fold that of Pt_(3)Ni NWs and commercial Pt/C catalyst,*** importantly,the Mo/Pt_(3)Ni NWs catalyst showed negligible structure degradation after 3,000 cycles(42 h)of durability test in 0.1 M HClO4 and 0.5 M ethanol,as compared to severe structural collapse and Ni dissolution for the pure Pt_(3)Ni *** density functional theory(DFT)calculation also confirmed that both the surface and subsurface Mo atom could form Pt-Mo and Ni-Mo bonds with Pt and Ni,which were stronger than Pt-Ni bonds,to pin the Ni atoms in the unstable position and suppress the dissolution of surface *** findings of this study indicate a promising pathway for the design and engineering of durable alloy nanocatalysts for direct ethanol fuel cell applications.

关键词： ternary Pt-based alloy one-dimensional nanowires Mo decoration electronic effect direct ethanol fuel cells

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Hierarchical TiO_2/ZnO Nanostructure as Novel Non-precious Electrocatalyst for ethanol Electrooxidation

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Journal of Materials Science & Technology 2015年第1期31卷 97-105页

作者： Gehan M.K.Tolba Nasser A.M.Barakat A.M.Bastaweesy E.A.Ashour Wael Abdelmoez Mohamed H.El-Newehy Salem S.Al-Deyab Hak Yong Kim Organic Materials and Fiber Engineering Department Chonbuk National University Chemical Engineering Department Faculty of EngineeringMinia University BioNanosystem Department Chonbuk National University Department of Chemistry College of ScienceKing Saud University

Metal oxides have a higher chemical stability in comparison to metals,so they can be utilized as electrocatalysts if the activity could be *** the composition,the morphology of the nanostructures has a considerable impact on the electrocatalytic *** this work,zinc oxide nano branches-attached titanium dioxide nanofibers were investigated as an economic and stable catalyst for ethanol electrooxidation in the alkaline *** introduced material has been synthesized by electrospinning process followed by hydrothermal ***,electrospinning of colloidal solution consisting of titanium isopropoxide,poly（vinyl acetate） and zinc nanoparticles was performed to produce nanofibers embedding solid *** order to produce TiO2nanofibers containing ZnO nanoparticles,the obtained electrospun nanofiber mats were calcined in air at 600 °*** formed ZnO nanoparticles were exploited as seeds to outgrow ZnO branches around the TiO2nanofibers using the hydrothermal technique at sub-critical water conditions in the presence of zinc nitrate and bis-hexamethylene *** morphology of the final product,as well as the electrochemical measurements indicated that zinc nanoparticles content in the original electrospun nanofibers has a significant influence on the electrocatalytic activity as the best performance was observed with the nanofibers synthesized from electrospun solution containing 0.1 g Zn,and the corresponding current density was 37 mA/***,this study paves a way to titanium dioxide to be exploited to synthesize effective and stable metal oxide-based electrocatalysts.

关键词： direct ethanol fuel cells Electrospinning Nanofibe

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Self-supporting trimetallic PtAuBi aerogels as electrocatalyst for ethanol oxidation reaction

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Chinese Journal of Structural Chemistry 2023年第8期42卷 21-30页

作者： Chu Li Xiaoguo Tie Yulin Min Qunjie Xu Qiaoxia Li Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power College of Environmental and Chemical EngineeringShanghai University of Electric PowerYangpu District2588 Changyang RoadShanghai200090China Shanghai Institute of Pollution Control and Ecological Security Shanghai200090China

The creation of anodic ethanol oxidation reaction catalysts with superior all-around performance for direct ethanol fuel cells(DEFCs)has continued to attract the attention of *** ultrathin trimetallic PtAuBi aerogel with branching,rough-surfaced 1D nanowires that self-assemble into a 3D porous network structure has been created in this *** has a mass activity(MA)of 8045 mA mgPt^(-1)in an alkaline medium,which is 7.56 times greater than that of commercial Pt/C(1064 mA mgPt^(-1)).Notably,the catalytic activity and resistance to CO poisoning of PtAuBi aerogels are improved by the addition of an efficient"active additive"*** results analysis reveals that the increased performance of PtAuBi aerogel is mostly attributable to the integrated function of the 3D porous network structure,the downward shift of the Pt d-band center,and the synergistic effect of the"Pt-Bi"and/or"Pt-Au"dual active sites.

关键词： PtAuBi aerogels ethanol oxidation reaction Carbon monoxide tolerance direct ethanol fuel cells

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