Hierarchical sea urchin-like Fe-doped heazlewoodite for high-efficient oxygen evolution

• Published in: Chemphyschem 2024-05, Vol.25 (9), p.e202300414-e202300414
• Main Authors: Kun, Shang, Junpo, Guo, Yingjun, Ma, Liu, Hangning, Xiaoling, Zhang, Huizhen, Wang, Wang, Jie, Yan, Zhenhua
• Format: Article
• Language: English
• Subjects: Catalysts; Coal gasification; Energy conversion; Iron; Metal foams; Nickel sulfide; Oxygen evolution reactions; Reaction kinetics; Substrates; Water splitting
• ISSN: 1439-4235; 1439-7641
• DOI: 10.1002/cphc.202300414

Electrochemical water-splitting to produce hydrogen is potential to substitute the traditional industrial coal gasification, but the oxygen evolution kinetics at the anode remains sluggish. In this paper, sea urchin-like Fe doped Ni3S2 catalyst growing on nickel foam (NF) substrate is constructed via a simple two-step strategy, including surface iron activation and post sulfuration process. The NF-Fe-Ni3S2 obtains at temperature of 130 ℃ (NF-Fe-Ni3S2-130) features nanoneedle-like arrays which are vertically grown on the particles to form sea urchin-like morphology, features high electrochemical surface area. As oxygen evolution catalyst, NF-Fe-Ni3S2-130 exhibits excellent oxygen evolution activities, fast reaction kinetics, and superior reaction stability. The excellent OER performance of sea urchin-like NF-Fe-Ni3S2-130 is mainly ascribed to the high-vertically dispersive of nanoneedles and the existing Fe dopants, which obviously improved the reaction kinetics and the intrinsic catalytic properties. The simple preparation strategy is conducive to establish high-electrochemical-interface catalysts, which shows great potential in renewable energy conversion.