Abstract
AbstractTo 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−xSP/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 Co3+/Co2+ 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 Co3+ content derived from partial S substitution with P and nonstoichiometric phase, the as‐synthesized Co2−xSP/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.
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