材料科学
甲醇
纳米结构
贵金属
催化作用
钯
化学工程
电催化剂
甲酸
各向异性
无机化学
纳米技术
铂金
金属
电化学
物理化学
化学
有机化学
冶金
电极
工程类
物理
量子力学
作者
Wenkai Liang,Yawen Wang,Liang Zhao,Wei Guo,Dong Li,Wei Qin,Haihua Wu,Yinghui Sun,Lin Jiang
标识
DOI:10.1002/adma.202100713
摘要
Anisotropic 3D nanostructures exhibit excellent electrocatalytic activity and stability due to their heterogeneous elemental distribution and unsymmetrical configuration. However, it is still a huge challenge to combine anisotropically distributed elements and anisotropic morphologies within one 3D nanostructure. Herein, 3D Au@Pt–Pd hemispherical nanostructures (Au@Pt–Pd H-Ss) are fabricated as highly efficient electrocatalysts for oxidation reaction, which present heterogenous element distribution and anisotropic morphology. It is demonstrated that the non-uniform adsorption of BO2− on Au-CTA+ surface, as well as the simulated lower formation energy of Pt–Pd atoms for Au-CTA+-BO2-, basically contribute to the eventual formation of Au@Pt–Pd H-Ss. Impressively, the unique anisotropic Au@Pt–Pd H-Ss exhibit superior electrocatalytic activity and durability for methanol, ethanol, and formic acid oxidation reaction compared with commercial Pt/C and previously reported noble-metal based electrocatalysts. Especially, the mass activity of Au@Pt–Pd H-Ss for MOR is 4.38 A mgPt+Pd-1, which is about 2.0 and 4.7 times that of Au@Pt–Pd spherical nanostructures (Au@Pt–Pd Ss) and commercial Pt/C catalyst, respectively. This work provides an important reference for the design and preparation of 3D anisotropic and high-efficiency electrocatalysts.
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