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Controllable synthesis of core-branch Ni3S2/Co9S8 directly on nickel foam as an efficient bifunctional electrocatalyst for overall water splitting
Journal of Power Sources ( IF 9.2 ) Pub Date : 2018-09-08 , DOI: 10.1016/j.jpowsour.2018.08.088
Jinghuang Lin , Haohan Wang , Xiaohang Zheng , Yue Du , Changyao Zhao , Junlei Qi , Jian Cao , Weidong Fei , Jicai Feng

Developing efficient and low-cost electrocatalysts for the oxygen evolution reaction and hydrogen evolution reaction is urgently needed for overall water splitting. Herein, three dimensional core-branch Ni3S2/Co9S8 arrays are directly grown on Ni foam by controllably sulfidizing NiCo-precursor with different concentrations of sulfur source. The unique core-branch Ni3S2/Co9S8 arrays provide large surface active areas for electrochemical reactions, open channels for effective gas release and intimate contact with Ni foam for fast electron transport. Serving as a free-standing electrocatalytic electrode, the as-synthesized Ni3S2/Co9S8 arrays show outstanding catalytic activity with an overpotential of 340 mV and 269 mV for oxygen evolution reaction and hydrogen evolution reaction at a current density of 100 mA cm−2 in 1 M KOH, respectively. Moreover, Ni3S2/Co9S8 works as a bifunctional electrocatalyst for overall water splitting, where the low cell voltage of 1.55 V at 10 mA cm−2 and good cycling performance can be successfully achieved. This work provides a facile strategy to construct core-branch nanostructures for an efficient bifunctional electrocatalyst for overall water splitting.



中文翻译:

直接在泡沫镍上可控地合成核分支Ni 3 S 2 / Co 9 S 8作为有效的双功能电催化剂,用于总水分解

为了总的水分解,迫切需要开发用于氧释放反应和氢释放反应的高效且低成本的电催化剂。在此,通过可控地硫化具有不同浓度的硫源的NiCo前体,在Ni泡沫上直接生长三维核分支Ni 3 S 2 / Co 9 S 8阵列。独特的核心分支Ni 3 S 2 / Co 9 S 8阵列提供了用于电化学反应的大表面活性区域,有效释放气体的开放通道以及与Ni泡沫紧密接触以实现快速电子传输。合成后的镍用作自立式电催化电极3 S 2 / Co 9 S 8阵列显示出出色的催化活性,在1 M KOH中的电流密度为100 mA cm -2时,氧释放反应和氢释放反应的超电势分别为340 mV和269 mV 。而且,Ni 3 S 2 / Co 9 S 8用作用于整体水分解的双功能电催化剂,其中可以成功地实现10mA cm -2的1.55 V的低电池电压和良好的循环性能。这项工作提供了一种简便的策略来构造核-分支纳米结构,以实现用于整体水分解的高效双功能电催化剂。

更新日期:2018-09-08
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