关键词: 电催化, 硒化镍, 水分解, 析氢反应, 析氧反应

Abstract: Electrocatalytic water splitting is considered as a promising technology for renewable energy. The development of efficient, stable, cost-effective, and bifunctional catalysts for both water reduction and oxidation has continued to face significant challenges. Herein, we report a robust and highly active nickel selenide (NiSe) spheres grown on carbon cloth (CC) by electrodeposition from a nickel selenite complex which is a single source containing both Ni and Se. A combination of two chemicals containing, separately, Ni and Se is used in traditional preparations of metal selenides, causing possible problems in the uniformity of the products. The as-prepared NiSe-EA/CC electrode exhibited electrocatalytic activities toward both water reduction and oxidation, with overpotentials of 154 mV at 10 mA·cm^-2 and 250 mV at 20 mA·cm^-2, respectively. A water electrolysis cell could realize a current density of 10 mA·cm^-2 at a cell voltage of 1.53 V with excellent stability, when using NiSe-EA/CC electrode as both the anode and the cathode.

Key words: electrocatalysis, nickel selenide, water splitting, hydrogen evolution reaction, oxygen evolution reaction