Construction of dendritic Pt–Pd bimetallic nanotubular heterostructure for advanced oxygen reduction  

作　　者：Mingwei Wang Zhiyi Hu Jieheng Lv Zhiwen Yin Zhewei Xu Jingfeng Liu Shihao Feng Xiaoqian Wang Jiazhen He Sicheng Luo Dafu Zhao Hang Li Xuemin Luo Qi Liu Damin Liu Baolian Su Dongyuan Zhao Yong Liu 

机构地区：[1]International School of Materials Science and Engineering(ISMSE),State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan,China [2]Department of Chemistry,Laboratory of Inorganic Materials Chemistry,University of Namur,Namur,Belgium [3]Department of Chemistry,Laboratory of Advanced Materials,Shanghai Key Lab of Molecular Catalysis and Innovative Materials,State Key Laboratory of Molecular Engineering of Polymers,Fudan University,Shanghai,China

出　　处：《Interdisciplinary Materials》2024年第6期907-918,共12页交叉学科材料(英文)

基　　金：National Natural Science Foundation of China,Grant/Award Number:52072281;Major Program of the National Natural Science Foundation of China,Grant/Award Number:22293021;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology。

摘　　要：Compositions and morphologies of Pt-based electrocatalysts have great impact on the electrocatalytic activity and stability of oxygen reduction reaction(ORR).Herein,we report a novel design of one-dimensional(1D)Pt-Pd dendritic nanotubular heterostructures(DTHs)by controlling the degree of Pt 2+-Pt reduction reaction and Pd-Pt galvanic replacement reaction with uniform Pd nanowires as sacrificial templates.The obtained Pt-Pd bimetallic DTHs catalyst exhibited uniform and dense Pt dendritic nanobranches on the surface of 1D hollow Pt-Pd alloy nanotubes,possessing superior catalytic activity for ORR compared to state-of-the-art commercial Pt/C catalysts.Typically,the Pt_(4)Pd DTHs catalyst showed efficient mass activity(MA,1.05 A mg_(Pt)^(−1))and specific activity(SA,1.25 mA cm_(Pt)^(−2))at 0.9 V(vs.RHE),and the catalyst exhibited high stability with 90.4%MA retention after 20000 potential cycles.The Pt-Pd bimetallic DTHs configuration combines the advantages of 1D hollow nanostructures and dense Pt dendritic nanobranches,which results in rich electrochemical active surface sites,fast charge transport,and multiple dendritic anchoring points contact on carbon support,thus boosting its catalytic activity and stability towards electrocatalysis.

关 键 词：dendritic hollow heterostructures ELECTROCATALYSIS one-dimensional nanowires oxygen reduction proton exchange membrane fuel cells 

分 类 号：O64[理学—物理化学]