Porous NiCo Diselenide Nanosheets Arrayed on Carbon Cloth as Promising Advanced Catalysts Used in Water Splitting. (20th January 2017)

• Record Type: Journal Article
• Authors: Wang, Xudan; Zheng, Yuanyuan; Yuan, Junhua; Shen, Jianfeng; Hu, Jianguo; Wang, Ai-jun; Wu, Lanju; Niu, Li
• Is Part Of: Electrochimica acta. Volume 225(2017)
• Page Start: 503
• Page End: 513
• Publication Date: 2017-01-20
• Subjects: Nanosheet array -- Three-dimensional architecture -- Water splitting -- Hydrogen evolution reaction -- Oxygen evolution reaction; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.12.162
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: A porous NiCo diselenide nanosheets were uniformly arrayed on carbon cloth. The 3D architecture facilitates charge transfer with huge surface area. These composites show a superior performance in water splitting. H2 evolution overpotential is 108 mV with a Tafel slope small as 31.6 mV·dec −1 . O2 evolution overpotential is 258 mV with a Tafel slope small as 42.3 mV·dec −1 . Abstract: we report the synthesis of porous NiCo diselenide nanosheets arrayed on carbon cloth (CC) via ion exchange with a hydroxide precursor. This bind-free three-dimensional (3D) architecture possesses the huge specific surface area and facilitates ion transport and charge transfer, leading to a superior performance in water splitting as a bifunctional catalyst for both H2 and O2 evolution reaction (HER and OER). The as-prepared NiCo diselenide/CC composites show a high HER capability in 0.5 M H2 SO4 solution with a Tafel slope as small as 31.6 mV·dec −1 . They offer a HER current of 10 mA·cm −2 at a low overpotential of 108 mV. Their OER efficiency is also remarkable in 1 M KOH solution with a small Tafel slope of 42.3 mV·dec −1 and a low overpotential of 258 mV at 10 mA·cm −2 . This 3D porous NiCo diselenide nanosheet array holds a promise as an attractive alternative to precious catalysts of water splitting with high activity and long-term stability.