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2H‐Au Nanosheet‐Templated Growth of PdFe for Electrocatalytic Methanol Oxidation
Author(s) -
Wang Jie,
Zhang An,
Niu Wenxin,
Liu Guigao,
Zhou Xichen,
Wang Lixin,
Liu Xiaozhi,
Li Lujiang,
Li Zijian,
Zhai Li,
Yang Qi,
Huang Biao,
Wa Qingbo,
Yun Qinbai,
Cheng Hongfei,
Ge Yiyao,
Huang Jingtao,
Hu Zhaoning,
Chen Bo,
Zhang Qinyong,
Fan Zhanxi,
Gu Lin,
Zhang Hua
Publication year - 2025
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202405073
Subject(s) - nanosheet , materials science , chemical engineering , nanotechnology , methanol , organic chemistry , chemistry , engineering
Abstract Pd‐based alloy nanomaterials normally crystallize in the conventional face‐centered cubic (fcc) crystal phase. Here, 2H‐Au nanosheets (NSs), possessing 2H crystal phase (2H: hexagonal close‐packed with a stacking sequence of “AB”), are used as templates for the growth of PdFe, during which the 2H‐to‐fcc phase transformation in Au NSs happens, leading to the formation of 2H/fcc Au@PdFe core–shell NSs. By changing the Pd/Fe atomic ratio, the 2H/fcc phase ratio in 2H/fcc Au@PdFe NSs can be tuned accordingly. As a proof‐of‐concept application, the as‐synthesized 2H/fcc Au@Pd 0.66 Fe 0.34 NSs are used as an electrocatalyst for methanol oxidation reaction (MOR) in alkaline media, exhibiting a remarkable mass activity of 4.39 A mg −1 Pd , which is 1.7, 5.4 and 12.9 times that of 2H/fcc Au@Pd 0.56 Fe 0.44 NSs (2.57 A mg −1 Pd ), 2H/fcc Au@Pd 0.40 Fe 0.60 NSs (0.81 A mg −1 Pd ), and Pd black (0.34 A mg −1 Pd ), respectively, placing it among the best of reported Pd‐based MOR electrocatalysts. This strategy, based on phase engineering of nanomaterials (PEN), paves an efficient way to the rational design and controlled synthesis of noble multimetallic nanostructures with unconventional phases for exploring the phase‐dependent properties and applications.