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Maximizing the Catalytic Performance of Pd@Au x Pd 1− x Nanocubes in H 2 O 2 Production by Reducing Shell Thickness to Increase Compositional Stability
Author(s) -
Zhang Yu,
Lyu Zhiheng,
Chen Zitao,
Zhu Shangqian,
Shi Yifeng,
Chen Ruhui,
Xie Minghao,
Yao Yao,
Chi Miaofang,
Shao Minhua,
Xia Younan
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202105137
Subject(s) - electrocatalyst , overpotential , catalysis , materials science , alloy , nanocrystal , selectivity , shell (structure) , reducing agent , chemical engineering , nanotechnology , crystallography , metallurgy , chemistry , composite material , electrode , electrochemistry , biochemistry , engineering
We report a simple route based upon seed‐mediated growth to the synthesis of Pd@Au x Pd 1− x (0.8≤ x ≤1) core–shell nanocubes. Benefiting from the well‐defined {100} facets and an optimal Au/Pd ratio for the surface, the nanocubes bearing a shell made of Au 0.95 Pd 0.05 work as an efficient electrocatalyst toward H 2 O 2 production, with high selectivity of 93–100 % in the low‐overpotential region of 0.4–0.7 V. When the Au 0.95 Pd 0.05 alloy is confined to a shell of only three atomic layers in thickness, the electrocatalyst is able to maintain its surface structure and elemental composition, endowing continuous and stable production of H 2 O 2 during oxygen reduction at a high rate of 1.62 mol g (Pd+Au) −1 h −1 . This work demonstrates a versatile route to the rational development of active and durable electrocatalysts based upon alloy nanocrystals.