State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, China.
University of Chinese Academy of Sciences , Beijing 100049, China.
ACS Appl Mater Interfaces. 2017 Nov 15;9(45):39312-39317. doi: 10.1021/acsami.7b10605. Epub 2017 Oct 31.
In this work, we synthesized a novel hybrid catalyst (CoB/CoSe) by growing amorphous CoB on the surface of CoSe nanosheets. Benefiting from the prominent coupled effects between CoB and CoSe nanosheets, an efficient oxygen evolution reaction catalyst CoB/CoSe exhibits a very low overpotential of 320 mV @ 10 mA cm with a Tafel slope of 56.0 mV dec in alkaline medium. An overpotential of 300 mV can also be achieved by CoB/CoSe at the same condition for hydrogen evolution reaction. Notably, at the applied potential of 1.73 V, the electrocatalyst CoB/CoSe demonstrates a current density of 10 mA cm for overall water splitting and displays an outstanding long-term stability. The faradaic efficiencies of CoB/CoSe for both hydrogen and oxygen evolution are close to 100%.
在这项工作中，我们通过在 CoSe 纳米片表面生长非晶态 CoB 合成了一种新型混合催化剂（CoB/CoSe）。得益于 CoB 和 CoSe 纳米片之间的显著耦合效应，高效的析氧反应催化剂 CoB/CoSe 在碱性介质中表现出非常低的过电势 320 mV@10 mA cm，塔菲尔斜率为 56.0 mV dec。在相同条件下，CoB/CoSe 也可以实现析氢反应的过电位 300 mV。值得注意的是，在施加的 1.73 V 电势下，电催化剂 CoB/CoSe 的整体水分解电流密度为 10 mA cm，并表现出出色的长期稳定性。CoB/CoSe 析氢和析氧的法拉第效率均接近 100%。
