摘要
氧析出反应(OER)是阳极电解水的关键步骤。提出了一种简单可控的一步电沉积制备Ni-Fe LDH的方法,并成功用于电催化OER反应。结果表明,在-1.1 V条件下,采用1∶1镍铁摩尔比,沉积液总浓度为0.12 M时沉积300 s所得Ni-Fe LDH薄膜催化剂具有高的OER催化活性(在10 m A/cm^2电流密度下的过电位为220 mV)、快的反应动力学(塔菲尔斜率为44.9 mV/dec)和优良的催化稳定性(持续极化10 h仅衰减2.5%)。
Oxygen evolution reaction (OER) is the key step for water splitting at anode. The paper presents a simple and controllable method for one - step synthesis of nickel - iron layered double hydroxide (Ni-Fe LDH) as a potential OER electrocatalyst. It is found that the Ni-Fe LDH deposited under the optimal conditions ( deposition time : 300 s; deposition potential: -1 .1 V; Ni^2++ Fe^3+ total concentration: 0.12 M; Ni/Fe ratio: 1: 1) demonstrates high catalytic activity (overpotential 220 mV at 10 mA/cm) , fast reaction dynamics (Tafel slope 44.9 mV/dec) , and excellent stability (retaining 97.5% after 10 h) toward OER reaction.
作者
徐梦莹
孟玲袆
王雅静
刘洪涛
XU Mengying MENG Lingyi WANG Yajing LIU Hongtao(Central South University, Changsha, Hunan 410083, China)
出处
《龙岩学院学报》
2016年第5期24-28,共5页
Journal of Longyan University
基金
湖南省科技计划重点项目(2014FJ2007)
关键词
电沉积
层状双金属氢氧化物
电催化
氧析出反应
electrodeposition
layered double hydroxide
electrocatalysis
oxygen evolution reaction