Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (2): 179-185.doi: 10.1007/s40242-019-8344-x

• Articles • Previous Articles     Next Articles

Hydrothermal Synthesized Co-Ni3S2 Ultrathin Nanosheets for Efficient and Enhanced Overall Water Splitting

JIAN Juan1, YUAN Long1,2, LI He1, LIU Huanhuan1, ZHANG Xinghui1, SUN Xuejiao1, YUAN Hongming1, FENG Shouhua1   

  1. 1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China;
    2. Key Laboratory of Functional Materials Physics and Chemistry, Ministry of Education, Jilin Normal University, Siping 136000, P. R. China
  • Received:2018-10-23 Revised:2018-12-10 Online:2019-04-01 Published:2019-04-30
  • Contact: YUAN Hongming E-mail:hmyuan@jlu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21427802).

Abstract: We used the one-step hydrothermal controlled synthesis method for Co-Ni3S2 ultrathin nanosheets grown directly on nickel foam(NF). The as-synthesized Co-Ni3S2/NF showed enhanced activities in the hydrogen evolution reaction(HER), oxygen evolution reaction(OER) and better overall water splitting(OWS) efficiency than the un-doped Ni3S2/NF. The voltage of Co-Ni3S2/NF for OWS was only 1.58 V at the current density of 10 mA/cm2 and with long time(>30 h) current output during the current-density(i-t) test. The good i-t performance was also observed in both HER and OER processes. Additionally, the Co-Ni3S2/NF showed a large current density(>1 A/cm2) for both HER and OER. When the current densities reached 100 and 1000 mA/cm2, the required overpotentials for Co-Ni3S2/NF were 0.35 and 0.75 V for OER and 0.30 and 0.85 V for HER. Therefore, after introducing Co, the activity of Ni3S2-based material was strongly enhanced.

Key words: Co-Ni3S2/nickel foam(NF), Ultrathin nanosheet, Water splitting, Hydrogen evolution reaction, Oxygen evolution reaction