Mechanochemical-assisted synthesis of ternary Ru-Ni-S pyrite analogue for enhanced hydrogen evolution performance
Mechanochemical-assisted synthesis of ternary Ru-Ni-S pyrite analogue for enhanced hydrogen evolution performance
复制标题
机械化学辅助合成三元 Ru-Ni-S 黄铁矿类似物以增强析氢性能
DOI：
10.1016/j.carbon.2020.02.040
复制
发表时间：
2020-06-01
期刊：
影响因子：
10.9
通讯作者：
Zhang, Yanfeng
中科院分区：
文献类型：
--
作者：
Jin, Tian (Leo);Liu, Xiaofei;Zhang, Yanfeng
过渡金属硫化物具有较低的本征电阻率，被认为是一种很有前途的析氢反应催化剂。传统的合成方法如溶剂热合成和共沉淀法通常涉及繁琐的过程和大量的有机溶剂消耗。在此，一个简单的机械化学辅助的策略是利用开发高效HER电催化剂与良好分散的单相黄铁矿型三元Ru-Ni-S纳米杂化嵌入在碳。基于Ru和Ni的协同效应，精心设计的RuNiS-C具有优异的HER活性，在碱性和酸性电解液中，RuNiS-C的过电位分别为25 mV和43 mV，电流密度分别为10 mA cm（-2）。在1 M KOH和0.5M H_2SO_4溶液中，当过电位为60 mV时，转化频率分别为6.85和2.84H（2）s（-1）。密度泛函理论计算表明，在三元硫化物中同时引入Ru和Ni位有效地降低了动能势垒，从而加速了HER过程.因此，本工作中的机械力化学辅助协同偶联策略为设计高效HER电催化剂铺平了新的途径。(c)2020爱思唯尔有限公司版权所有。
Transition metal sulfide has been well-considered as a promising type of hydrogen evolution reaction (HER) catalysts with relatively low intrinsic electrical resistivity. Conventional synthetic procedures such as solvothermal synthesis and co-precipitation usually involve tedious processes and large consumption of organic solvents. Herein, a facile mechanochemical-assisted strategy was utilized to develop highly efficient HER electrocatalysts with well-dispersed single-phase pyrite-type ternary Ru-Ni-S nanohybrids embedded in the carbon. As a result of carefully designed structure based on synergistic effects between Ru and Ni bimetallic sites, the well-designed RuNiS-C demonstrates outstanding activity for HER. Specifically, the as-prepared RuNiS-C displays extremely low overpotential of 25 mV and 43 mV to generate a current density of 10 mA cm(-2) in alkaline and acid electrolyte, respectively. In addition, an exceptionally high turnover frequency value of 6.85 and 2.84H(2) s(-1) in 1 M KOH and 0.5 M H2SO4 were achieved at the overpotential of 60 mV, respectively. Density functional theory calculations indicated that the simultaneous introduction of Ru and Ni sites in ternary sulfide efficiently reduced the kinetic energy barrier, and thereby accelerated the HER process. Therefore, the mechanochemical-assisted synergistic coupling strategy in this work paves a new avenue to design highly efficient HER electrocatalysts. (c) 2020 Elsevier Ltd. All rights reserved.