Regulative Electronic States around Ruthenium/Ruthenium Disulphide Heterointerfaces for Efficient Water Splitting in Acidic Media
Jiawei Zhu, Yao Guo, Fang Liu, Hanwen Xu, Lei Gong, Wenjie Shi, Ding Chen, Pengyan Wang, Yue Yang, Chengtian Zhang, Jinsong Wu, Jiahuan Luo, Shichun Mu
Abstract
Abstract Theoretical calculations unveil the charge redistribution over abundant interfaces and the enhanced electronic states of Ru/RuS 2 heterostructure. The resulting surface electron‐deficient Ru sites display optimized adsorption behavior toward diverse reaction intermediates, thereby reducing the thermodynamic energy barriers. Experimentally, for the first time the laminar Ru/RuS 2 heterostructure is rationally engineered by virtue of the synchronous reduction and sulfurization under eutectic salt system. Impressively, it exhibits extremely high catalytic activity for both OER (201 mV @ 10 mA cm −2 ) and HER (45 mV @ 10 mA cm −2 ) in acidic media due to favorable kinetics and excellent specific activity, consequently leading to a terrific performance in acidic overall water splitting devices (1.501 V @ 10 mA cm −2 ). The in‐depth insight into the internal activity origin of interfacial effect could offer precise guidance for the rational establishment of hybrid interfaces.