One-Step Synthesis of Porous FeNiS x Coupled with 1T/2H MoS2 via Hydrazine Hydrate-Induced Phase Transformation for Hydrogen Evolution

• Published in: Industrial & engineering chemistry research 2024-01, Vol.63 (1), p.210-219
• Main Authors: Tang, Huangcong, Dou, Jiayang, He, Zhixian, An, Jingwen, Liu, Wenhuan, Dong, Sheying
• Format: Article
• Language: English
• Subjects: Kinetics, Catalysis, and Reaction Engineering
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/acs.iecr.3c03511

Heterostructured catalysts with the potential synergies between the polymetallic sulfides and the construction of 1T-phase MoS2 are a promising alternative and contribute to obtain the enhanced hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance. Herein, the porous hybrid nanostructures coupling FeS2 and NiS complexes with 1T/2H phase MoS2 (FeNiS x @MoS2–HZH x ) are prepared via a facile one-pot pyrolysis strategy accompanied by hydrazine hydrate (HZH)-induced phase transformation without the assistance of a template. The hybrid nanostructures possessing crystalline–amorphous (c–a) interface need overpotentials of 139 mV to achieve the current density of 10 mA cm–2 (η10) in 0.5 M H2SO4, which have superior kinetics for the HER process with a Tafel slope value of 57.9 mV dec–1. The 24 h continuous HER operated at η10 exhibits negligible deterioration, which has only a decrease of 3 mV at η10 after the 5000 cyclic voltammetry cycle tests, indicating the desirable stability of FeNiS x @MoS2–HZH2. Beyond that, the resultant FeNiS x @MoS2 requires 335 mV at η10. Specifically, the electrochemical and structural characterization prove that the enhanced HER performance is contributed from the incorporation of HZH to form FeS2/MoS2/NiS heterostructures and c–a interface sites coupling with 1T/2H phase MoS2, which provide more exposed active sites benefiting from the larger surface area. The simple and convenient design strategy has certain enlightenment for the development of sustainable energy production.