过电位
电催化剂
析氧
塔菲尔方程
材料科学
化学工程
催化作用
纳米技术
电化学
无机化学
电极
化学
物理化学
有机化学
工程类
作者
Jiangyue Chen,Chuang Fan,Xianyu Hu,Chao Wang,Zihan Huang,Gengtao Fu,Jong‐Min Lee,Yawen Tang
出处
期刊:Small
[Wiley]
日期:2019-05-29
卷期号:15 (28)
被引量:164
标识
DOI:10.1002/smll.201901518
摘要
Tailoring composition and morphology of electrocatalysts is of great importance in improving their catalytic performance. Herein, a salt-templated strategy is proposed to construct novel multicomponent Co/Cox My (M = P, N) hybrids with outstanding electrocatalytic performance for the oxygen evolution reaction (OER). The obtained Co/Cox My hybrids present porous sheet-like architecture consisting of many hierarchical secondary building-units. The synthetic strategy depends on a facile and effective dissolution-recrystallization-pyrolysis process under NH3 atmosphere of the precursors, which does not involve any surfactant or long-time hydrothermal pretreatment. That is different from the conventional methods for the synthesis of hierarchical nitrides/phosphides. Benefitting from unique composition/structure-dependent merits, the Co/Cox My hybrids as a typical Mott-Schottky electrocatalyst exhibit good OER performance in an alkaline medium compared with their counterparts, as evidenced by a low overpotential of 334 mV at 10 mA cm-2 and a small Tafel slope of 79.2 mV dec-1 , as well as superior long-term stability. More importantly, the Co/Cox My +Pt/C achieves higher voltaic efficiency and several times longer cycle life than conventional RuO2 +Pt/C catalysts in rechargeable Zn-air batteries. It is envisioned that the present work can provide a new avenue for the development of Mott-Schottky electrocatalysts for sustainable energy storage.
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