A three-dimensional coral-like Zn, O-codoped Ni3S2 electrocatalyst for efficient overall water splitting at a large current density. Issue 2 (21st December 2021)

• Record Type: Journal Article
• Authors: Cao, Liyun; Zhang, Yifei; Feng, Liangliang; He, Danyang; Liu, Qianqian; Gong, Yingbo; Li, Guodong; Huang, Jianfeng
• Is Part Of: Sustainable energy & fuels. Volume 6:Issue 2(2022)
• Page Start: 466
• Page End: 473
• Publication Date: 2021-12-21
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/d1se01708j
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : A three-dimensional coral-like Zn, O-codoped Ni3 S2 nanostructure is grown on nickel foam via a facile solvothermal method, exhibiting excellent electrocatalytic performance at high current density. Abstract : The synergistic achievement of geometrical optimization and electronic structure adjustment of electrocatalysts is significant to accelerate the efficiency of overall water splitting. Herein, we report a three-dimensional coral-like Zn, O-codoped Ni3 S2 nanostructure grown on nickel foam (denoted as ZO-Ni3 S2 /NF) by a facile solvothermal method. We show that the introduction of Zn 2+ can not only trigger the generation of a three-dimensional coral-like nanoarchitecture of Ni3 S2 /NF with a larger catalytically active area, but also increases the number of active Ni 3+ sites in ZO-Ni3 S2 /NF, which enhances the adsorption capacity of intermediates in the oxygen evolution reaction (OER) process. Moreover, the O-doping endows Ni3 S2 with improved intrinsic electronic conductivity and thus facilitates fast charge transfer during the hydrogen evolution reaction (HER). As expected, ZO-Ni3 S2 /NF exhibits excellent electrocatalytic performance, requiring only 235 mV and 450 mV to deliver 500 mA cm −2 for the HER and OER, respectively. The findings in our work provide new insights for the development of highly active and stable noble-metal-free electrocatalysts at high current density for industrial hydrogen fuel production.