Unique hierarchical flower-like PtNi alloy nanocrystals with enhanced oxygen reduction properties

被引：12

作者：

You, Shili ^{[1
]}

Luo, Pan ^{[1
]}

Fang, Ling ^{[1
]}

Gao, Jiaojiao ^{[1
]}

Liu, Li ^{[1
]}

Xu, Haitao ^{[1
]}

Zhang, Huijuan ^{[1
]}

Wang, Yu ^{[1
]}

机构：

[1] Chongqing Univ, State Key Lab Power Transmiss Equipment & Syst Se, 174 Shazheng St, Chongqing 400044, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2019年 / 294卷

基金：

中国国家自然科学基金;

关键词：

H-PtNi; high-index facets; hierarchical structure; oxygen reduction reaction; HIGH-INDEX FACETS; ELECTROCATALYTIC ACTIVITY; SOLVOTHERMAL SYNTHESIS; NANOPARTICLES; PT3NI; NI; SURFACE; METHANOL; OXIDATION; CO;

D O I：

10.1016/j.electacta.2018.10.121

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

During the past few decades, substantial efforts have been made to explore high-performance electrocatalysts for proton-exchange membrane fuel cells due to the sluggish oxygen reduction reaction kinetics at the cathode. Among multifarious approaches, it has been demonstrated that alloying Pt nanocrystals with transition metals and introducing Pt-based nanocrystals with high-index facets have been recognized as effective strategies to facilitate the enhancement of oxygen reduction reaction performance. However, the current synthetic approach for preparing catalysts with high-index facets is complicated. Herein, we demonstrate a straightforward one-step method to synthesize three-dimensional flower-like high-index faceted PtNi alloy nanocrystals constituted by abundant nano-cones similar to the quadrihedron. The as-prepared catalyst exhibits remarkably improved catalytic performance in comparison with PtNi-1, PtNi-2 and Pt/C, which is ascribed to a great number of high-index facets and highly open hierarchical structure. The resultant high-index faceted PtNi alloy nanocrystals deliver excellent mass activity of 1.76 Amg(-1). Meanwhile, the material also displays a great stability after 20000 potential cycles. Consequently, the methodology proposed in this work may provide some guidance to boost the improvement of oxygen reduction reaction, and the 3D flower-like high-index faceted PtNi alloy nanocrystals have a great potential to be turned into effective cathode catalysts for proton-exchange membrane fuel cells. (c) 2018 Elsevier Ltd. All rights reserved.

引用

页码：406 / 412

页数：7

共 62 条

[1] Colloidal synthesis of NixPt1-x nanoparticles with tuneable composition and size [J].