Ni3N@Ni-Ci nanoarray as a highly active and durable non-noble-metal electrocatalyst for water oxidation at near-neutral pH

被引：145

作者：

Xie, Fengyu ^{[1
]}

Wu, Huali ^{[1
]}

Mou, Jirong ^{[1
]}

Lin, Dunmin ^{[1
]}

Xu, Chenggang ^{[1
]}

Wu, Cong ^{[1
]}

Sun, Xuping ^{[2
]}

机构：

[1] Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610068, Sichuan, Peoples R China

[2] China West Normal Univ, Sch Chem & Chem Engn, Key Lab Sichuan Prov, Chem Synth & Pollut Control, Nanchong 637002, Sichuan, Peoples R China

来源：

JOURNAL OF CATALYSIS | 2017年 / 356卷

关键词：

Ni3N@Ni-Ci nanoarray; Electrocatalysis; Water oxidation; Near-neutral pH; Carbonate electrolyte; OXYGEN EVOLUTION ELECTRODE; LAYERED DOUBLE HYDROXIDE; THIN-FILM; BIFUNCTIONAL ELECTROCATALYST; CATALYST ELECTRODE; EVOLVING CATALYST; NICKEL NITRIDE; EFFICIENT; OXIDE; HYDROGEN;

D O I：

10.1016/j.jcat.2017.10.013

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

It is of great importance to design and exploit high-efficiency low-costelectrocatalysts for the oxygen evolution reaction (OER) under mild conditions for applications. In this Article, we propose that formation of a thin amorphous Ni carbonate layer on Ni3N nanoarray supported on carbon cloth (Ni3N NA/CC) is an effective strategy to boost its OER activity in at near-neutral pH. When used as a 3D non noble-metal OER electrocatalyst, the resulting core-shell Ni3N@Ni-Ci NA/CC displays superior catalytic activity with extremely small overpotential of 400 mV for 20 mA cm(-2) in 1.0 M KHCO3 (bulk pH: 8.3). Moreover, it also exhibits considerable long-term electrochemical durability with its activity being preserved for at least 12 h. Conductive Ni3N nanoarray not only provides as the Ni source for in-situ electrochemical derivation of 3D Ni-Ci catalyst with high surface area, more exposed active sites and facilitated mass diffusion, but effectively prompts the electron transport from Ni-Ci shell to CC, enabling more efficient water oxidation electrocatalysis. (C) 2017 Elsevier Inc. All rights reserved.

引用

页码：165 / 172

页数：8