双功能Ru-Co-Mn三元金属合金纳米催化剂用于氧化还原电催化

Ru-Co-Mn trimetallic alloy nanocatalyst driving bifunctional redox electrocatalysis

电解水是最有前景的制氢方法之一,但长期以来一直受到阳极析氧反应(OER)迟缓的限制.本文采用热解-吸附-热解工艺,以ZIF-67为前驱体,制备了Ru-Co-Mn三金属合金纳米颗粒(NPs)负载在氮掺杂碳载体上(RuCoMn@NC)的催化剂.该催化剂在较宽的pH范围内对析氢反应(HER)以及在碱性介质中对葡萄糖氧化反应(GOR)都表现出良好的电催化性能.特别是RuCoMn@NC催化剂在碱性介质中表现出优异的HER活性,优于商用Pt/C催化剂(20 wt%),并具有良好的电化学稳定性.进一步以RuCoMn@NC同时作为阴极和阳极组成双电极碱性电解槽用于葡萄糖电解反应,只需要1.63 V的槽电压就可以达到10mAcm^(-2)的电流密度,比全解水电解槽的所需电压低270mV.本工作为合理开发高效的氧化还原电催化双功能催化剂提供了一种有效的方法,有利于节能电解制氢的发展.

Water electrolysis is one of the most promising approaches for producing hydrogen.However,it has been hindered by the sluggishness of the anodic oxygen evolution reaction.In this work,we fabricated Ru-Co-Mn trimetallic alloy nanoparticles on N-doped carbon support(RuCoMn@NC)via the pyrolysis-adsorption-pyrolysis process using ZIF-67 as a precursor.The RuCoMn@NC catalyst exhibited excellent electrocatalytic performance for the hydrogen evolution reaction(HER)over a wide range of pH and glucose oxidation reaction in alkaline media.It showed exceptional HER activity in alkaline medium,superior to that of the commercial Pt/C catalyst(20 wt%),and good electrochemical stability.Further,a two-electrode alkaline electrolyzer pairing RuCoMn@NC as both cathode and anode was employed,and only a cell voltage of 1.63 V was required to attain a current density of 10 mA cm^(-2)in glucose electrolysis,which is about 270 mV lower than that in the overall water-splitting electrolyzer.This paper provides a promising method for developing efficiently bifunctional electrocatalysts driving redox electrocatalysis,and it would be beneficial to energy-saving electrolytic H_(2) production.