Exploring catalytic behaviors of CoS2-ReS2 heterojunction by interfacial engineering
Jianmin Yu, Yongteng Qian, Sohyeon Seo, Yang Liu, Huong Thi Bui, Ngoc Quang Tran, Jinsun Lee, Ashwani Kumar, Hongdan Wang, Yongguang Luo, Xiaodong Shao, Yunhee Cho, Xinghui Liu, Min Gyu Kim, Hyoyoung Lee, Hyoyoung Lee
Abstract
Herein, a stable and efficient CoS 2 -ReS 2 electrocatalyst is successfully constructed by using the different molar ratios of CoS 2 on ReS 2 . The size and morphology of the catalysts are significantly changed after the CoS 2 is grown on ReS 2 , providing regulation of the catalytic activity of ReS 2 . Particularly, the optimized CoS 2 -ReS 2 shows superior electrocatalytic properties with a low voltage of 1.48 V at 20 mA cm −2 for overall water splitting in 1.0 M KOH, which is smaller than the noble metal-based catalysts (1.77 V at 20 mA cm −2 ). The XPS, XAS, and theoretical data confirm that the interfacial regulation of ReS 2 by CoS 2 can provide rich edge catalytic sites, which greatly optimizes the catalytic kinetics and drop the energy barrier for oxygen/hydrogen evolution reactions. Our results demonstrated that interfacial engineering is an efficient route for fabricating high-performance water splitting electrocatalysts .