摘要
It is highly desirable but still a challenging task to find a simple,fast and straightforward method to greatly improve the alkaline oxygen evolution reaction(OER)performance of a NiCo_(2)O_(4)catalyst.In this communication,we demonstrate that developing an amorphous borate shell on a NiCo_(2)O_(4)surface can boost its OER activity in alkaline media.As a 3D catalyst electrode,a NiCo_(2)O_(4)@Ni–Co–B nanoarray on carbon cloth needs an overpotential of only 270 mV to achieve a geometrical catalytic current density of 10 mA cm^(−2)in 1.0 M KOH,which is 100 mV less than that for a NiCo_(2)O_(4)nanoarray.Notably,this electrode also demonstrates strong electrochemical durability,maintaining its activity for at least 100 h.The superior activity of NiCo_(2)O_(4)@Ni–Co–B is attributed to the amorphous Ni–Co–B shell on NiCo_(2)O_(4)favoring the in situ electrochemical generation of more active species during water oxidation.
基金
supported by the National Natural Science Foundation of China(No.21575137 and 21375076).
