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Electrodeposition of Cobalt Phosphosulfide Nanosheets on Carbon Fiber Paper as Efficient Electrocatalyst for Oxygen Evolution
Author(s) -
Liu Zhenchuan,
Zhang Junfeng,
Liu Yangxing,
Zhu Weikang,
Zhang Xiangwen,
Wang Qingfa
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800384
Subject(s) - overpotential , tafel equation , electrocatalyst , cobalt , oxygen evolution , nanosheet , cobalt hydroxide , materials science , chemical engineering , cyclic voltammetry , electrochemistry , cobalt sulfide , transition metal , oxide , inorganic chemistry , nanotechnology , electrode , chemistry , catalysis , metallurgy , organic chemistry , engineering
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 (Co 2− 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 Co 2− 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.