Affiliation:
1. Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences Guangxi Normal University Guilin China
2. Department of Smart Fab. Technology, School of Mechanical Engineering Sungkyunkwan University Suwon Republic of Korea
3. School of Materials Science and Engineering Kyungpook National University Daegu Republic of Korea
4. Saudi Arabia Basic Industries Corporation (SABIC) at King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia
Abstract
AbstractMost advanced hydrogen evolution reaction (HER) catalysts show high activity under alkaline conditions. However, the performance deteriorates at a natural and acidic pH, which is often problematic in practical applications. Herein, a rhenium (Re) sulfide–transition‐metal dichalcogenide heterojunction catalyst with Re‐rich vacancies (NiS2‐ReS2‐V) has been constructed. The optimized catalyst shows extraordinary electrocatalytic HER performance over a wide range of pH, with ultralow overpotentials of 42, 85, and 122 mV under alkaline, acidic, and neutral conditions, respectively. Moreover, the two‐electrode system with NiS2‐ReS2‐V1 as the cathode provides a voltage of 1.73 V at 500 mA cm−2, superior to industrial systems. Besides, the open‐circuit voltage of a single Zn–H2O cell with NiS2‐ReS2‐V1 as the cathode can reach an impressive 90.9% of the theoretical value, with a maximum power density of up to 31.6 mW cm−2. Moreover, it shows remarkable stability, with sustained discharge for approximately 120 h at 10 mA cm−2, significantly outperforming commercial Pt/C catalysts under the same conditions in all aspects. A series of systematic characterizations and theoretical calculations demonstrate that Re vacancies on the heterojunction interface would generate a stronger built‐in electric field, which profoundly affects surface charge distribution and subsequently enhances HER performance.
Funder
Natural Science Foundation of Guangxi Zhuang Autonomous Region
National Research Foundation of Korea
National Natural Science Foundation of China