Interfacial engineering of NiS/NiMoO4 nanorod arrays to improve OER and HER performance for stable overall water splitting

• Published in: Electrochimica acta Vol. 513; p. 145604
• Main Authors: Fang, Anchun, Wang, Jiaheng, Zhou, Jie, Zhao, Yang, Cao, Yulong, Wang, Qingwei, Zhong, Linzhi, He, Jingyue, Gong, Jiaxu, Dai, Yatang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 10.02.2025
• Subjects: Functional catalysts; Heterostructure; Interfacial engineering; Transition metal compounds; Heterostructure; Transition metal compounds; Interfacial engineering; Functional catalysts
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2024.145604

•Heterostructured NiS/NiMoO4 as a bifunctional catalyst for HER and OER.•Only 270 mV overpotentials were required to reach 100 mA cm-2•The DFT results confirm the synergetic effect between NiS and NiMoO4.•The electrolyser requires only 1.54 V to deliver a current density of 10 mA cm-2. The development of highly efficient and stable OER and HER bifunctional catalysts is important for sustainable energy conversion. Interfacial engineering is one of the most effective strategies to modulate the electronic structure of the active center to enhance the catalytic activity. Therefore, in this paper, NiMoO4 nanorods grown on nickel foam were annealed and etched to enable the formation of α-NiMoO4, β-NiMoO4 and NiS phases on the surface of the nanorods. This method enables controlled phase transformation and etching of the nanorod surface. As a bifunctional catalyst, NiS/NiMoO4 performs excellently, requiring only 270 mV and 270 mV overpotentials to reach 100 mA cm-2 for OER and HER, respectively. Excellent durability was demonstrated in a two-electrode electrolytic cell stability test at 100 mA cm-2 for 200 h. This study suggests a rational approach to interfacial design for improving catalyst activity. The construction of NiS/300-NiMoO4 enables optimisation of the electronic environment around the active sites and synergistic enhancement of the OER and HER activity. [Display omitted]