High index surface‐exposed and composition‐graded PtCu_(3)@Pt_(3)Cu@Pt nanodendrites for high‐performance oxygen reduction

作     者：Yuxiang Liao Jun Li Shiming Zhang Shengli Chen 廖宇翔;李俊;张世明;陈胜利

作者机构：College of Chemistry and Molecular SciencesWuhan UniversityHubei Key Laboratory of Electrochemical Power SourcesWuhan 430072HubeiChina Institute for Sustainable EnergyCollege of SciencesShanghai UniversityShanghai 200444China 

基　　金：国家自然科学基金(21832004,21633008) 上海市青年科技启明星计划(18QB1404400) 

出 版 物：《Chinese Journal of Catalysis》 (催化学报（英文）)

年 卷 期：2021年第42卷第7期

页      码：1108-1116页

摘      要：Alloying and nanostructuring are two strategies used to facilitate the efficient electrocatalysis of the oxygen reduction reaction(ORR)by Pt,where the high index surfaces(HISs)of Pt exhibit superior activity for ***,we report the fabrication of PtCu3 nanodendrites possessing rich spiny branches exposing n(111)×(110)*** dendrites were formed through an etching‐modulated seeding and growing ***,an oxidative atmosphere was initially applied to form the concaved nanocubes of the Pt‐Cu seeds,which was then switched to an inert atmosphere to promote an explosive growth of ***,the oxidative or inert atmosphere failed to produce this hyperbranched *** dealloying of the PtCu3 nanodendrites produced Pt3Cu shells with Pt‐rich surfaces where HIS‐exposed dendrite structures were *** resulting PtCu_(3)@Pt_(3)Cu@Pt nanodendrites in 0.1 M HClO4 exhibited excellent mass and area specific activities for ORR,which were 14 and 24 times higher than that of commercial Pt/C,*** calculations revealed that Cu alloying and HISs both contributed to the significantly enhanced activity of Pt,and that the oxygen binding energy on the step sites of HISs on the PtCu_(3)@Pt_(3)Cu@Pt nanodendrites approached the optimal value to achieve a near peak‐top ORR activity.

主 题 词：Oxygen reduction Pt‐Cu alloy High‐index‐surfaces Nanodendrites Shape control 

学科分类：0808[工学-自动化类] 081705[081705] 08[工学] 0817[工学-轻工类] 

核心收录：

D　O　I：10.1016/S1872‐2067(20)63735‐4

馆 藏 号：203102047...