High-efficiency overall alkaline seawater splitting: using a nickel–iron sulfide nanosheet array as a bifunctional electrocatalyst. Issue 3 (5th January 2023)

• Record Type: Journal Article
• Authors: Chen, Jie; Zhang, Longcheng; Li, Jun; He, Xun; Zheng, Yinyuan; Sun, Shengjun; Fang, Xiaodong; Zheng, Dongdong; Luo, Yongsong; Wang, Yan; Zhang, Jing; Xie, Lisi; Cai, Zhengwei; Sun, Yuntong; Alshehri, Abdulmohsen Ali; Kong, Qingquan; Tang, Chengwu; Sun, Xuping
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 3(2023)
• Page Start: 1116
• Page End: 1122
• Publication Date: 2023-01-05
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta08568b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : NiFeS nanosheet array on Ni foam (NiFeS/NF) behaves as a superb bifunctional electrocatalyst for overall seawater splitting, attaining a commercially demanded current density of 500 mA cm −2 at a low cell voltage of 1.85 V with robust stability. Abstract : The use of large-current-density electrolysis of seawater is promising for a massive hydrogen (H2 ) production. This process, however, requires high-performance and cost-effective bifunctional catalysts for the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). Herein, a nickel–iron sulfide nanosheet array on nickel foam (NiFeS/NF) is demonstrated to be a superb bifunctional electrocatalyst for seawater splitting, delivering the industrially demanded current density of 500 mA cm −2 at overpotentials of 300 and 347 mV for OER and HER in alkaline seawater, respectively. Moreover, its corresponding two-electrode electrolyzer only requires a cell voltage of 1.85 V to drive 500 mA cm −2 and shows a strong stability for at least 50 h of electrolysis in alkaline seawater, outperforming the most recently reported seawater-splitting catalyst electrodes.