Electrodeposition of Cobalt Phosphosulfide Nanosheets on Carbon Fiber Paper as Efficient Electrocatalyst for Oxygen Evolution. Issue 13 (16th May 2018)

• Record Type: Journal Article
• Authors: Liu, Zhenchuan; Zhang, Junfeng; Liu, Yangxing; Zhu, Weikang; Zhang, Xiangwen; Wang, Qingfa
• Is Part Of: ChemElectroChem. Volume 5:Issue 13(2018)
• Page Start: 1677
• Page End: 1682
• Publication Date: 2018-05-16
• Subjects: cobalt phosphosulfide -- electrochemistry -- electrodeposition -- nanostructures -- oxygen evolution reaction; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201800384
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: To maximize the activity and durability of transition metal sulfides for water oxidation is still a great challenge. Herein, we developed a new cobalt phosphosulfide nanosheet on carbon fiber paper (CFP) substrate electrocatalyst (Co2− x SP/CFP) following a simple two‐step electrodeposition method. The cobalt sulfide nanosheets were first deposited onto CFP by cyclic voltammetry. Then, the surface structure and P/S ratio as well as the Co 3+ /Co 2+ ratio of the phosphosulfide nanosheets were well tuned by regulating the cycling numbers of the phosphorous electrodeposition. Benefiting from the hierarchical structure, distinct phosphosulfide species, as well as a high Co 3+ content derived from partial S substitution with P and nonstoichiometric phase, the as‐synthesized Co2− x SP/CFP exhibits remarkable activity with an overpotential of 279 mV at a current density of 10 mA cm −2, a low Tafel slope of 54 mV dec −1 and excellent long‐term stability towards OER (overpotential increase of only 4.7 % within 60 h). Structural analysis after stability test indicates that cobalt oxide/hydroxide species are formed on the surface, which contribute to the high performance and excellent durability for oxygen evolution. This provides a simple and facile approach to rationally design and synthesize transition metal phosphosulfides for advanced electrochemical application. Abstract : Between the sheets : a facile electrochemical deposition approach is developed to obtain novel hierarchical cobalt phosphosulfide nanosheets on carbon fiber paper. The prepared cobalt phosphide nanosheets exhibit excellent performance in oxygen evolution catalysis.