Interfacial electronic modification of bimetallic oxyphosphides as Multi-functional electrocatalyst for water splitting and urea electrolysis

被引:32
作者
Yang, Lijun [1 ]
Zhang, Lei [1 ]
机构
[1] Liaoning Univ, Coll Chem, 66 Chongshan Middle Rd, Shenyang 110036, Liaoning, Peoples R China
基金
中国国家自然科学基金;
关键词
Interfacial electronic engineering; Anionic modulation; HER; Urea electrolysis; Density functional theory calculation; HYDROGEN EVOLUTION; OXYGEN EVOLUTION; BIFUNCTIONAL ELECTROCATALYST; ENERGY-EFFICIENT; POROUS CARBON; ALKALINE; NICKEL; NANOSHEETS; PHOSPHIDE; NANOPARTICLES;
D O I
10.1016/j.jcis.2021.09.013
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
Electrochemical water or wastewater splitting is a sustainable development approach for both hydrogen generation and pollutant elimination. Herein, an N-engineering ultrathin bimetallic oxyphosphides nanosheets on Ni foam (CoNiOP/NF) as a multi-functional binder-free electrode was synthesized for hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and urea oxidation reaction (UOR). The catalytic activity of the composites could be improved through introducing N-doping via an in-situ transformation and heterogeneous metals by ion exchange. Both theoretical calculation and experimental investigations confirmed that electrons transferred from metal centers to anion at the interface, which was favor to accelerate the phase transformation to electrochemically active species and optimize the intermediates adsorption dynamics, thus providing greatly enhanced electrocatalytic activities. Assembled an electrolyzer using UOR replaced OER, it required only 1.42 V to achieve 50 mA cm(-2) with long-term stability, 214 mV less than that required for HER parallel to OER. This work would be beneficial for the exploitation of non-noble metal-based electrocatalysts for simultaneous realization of energy-saving urea-assisted electrolytic hydrogen production and urea-containing wastewater purifying. (C) 2021 Elsevier Inc. All rights reserved.
引用
收藏
页码:546 / 555
页数:10
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