Redox bifunctional activities with optical gain of Ni3S2 nanosheets edged with MoS2 for overall water splitting

By Chengzhong Wang, X. Shao, Jing Pan, Jingguo Hu, Xiaoyong Xu. 2020

146 citations recorded by the source corpus.

Abstract Exploring cost-efficient catalysts with bifunctional activities of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) holds practical significance for overall water splitting. Herein, for the first time, we report a unique lateral heterostructure of ultrathin Ni3S2 nanosheets (NSs) edged with MoS2 as an efficient and durable bifunctional catalyst for overall water splitting in alkaline media. Benefiting from maximizing functional Mo-S-Ni interfaces that favor the chemisorption of hydrogen and oxygen-containing intermediates, the resultant Ni3S2/MoS2 (NiMoS) catalyst exhibits respectively low overpotentials of 78 and 260 mV at 10 mA cm−2 for HER and OER, superior to the commercial benchmarks (IrO2 and Pt/C), ranking among the best records reported to date. In particular, the NiMoS catalyst renders an attractive light-enhanced effect on both HER and OER activities due to photogenerated charge transfer at Mo-S-Ni interface towards redox kinetic acceleration. An assembled two-electrode alkaline electrolyzer using NiMoS as bifunctional catalysts can deliver a current density of 10 mA cm−2 at low cell voltage of 1.53 V (1.50 V under 1 sun irradiation) with remarkable stability for over 100 h, demonstrating the robust overall water splitting with accessible solar integration.

Subfields: Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/5b43fed8f598d6c2cd4a1341a479cfaf96a14b2f