Bimetallic polyoxometalate derived Co/WN composite as electrocatalyst for high-efficiency hydrogen evolution |
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| Affiliation: | 1. School of Chemical and Environmental Engineering, Jilin Provincial Science and Technology Innovation Centre of Optical Materials and Chemistry, Changchun University of Science and Technology, International Joint Research Center for Optical Functional Materials and Chemistry, Changchun University of Science and Technology, Changchun, People''s Republic of China;2. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, People''s Republic of China |
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| Abstract: | Electrocatalytic hydrogen evolution reaction (HER) is a simple way to generate environment-friendly hydrogen energy. Due to the high price and low content, the wide application of noble metal-based electrocatalysts is limited. It is of great significance to study inexpensive, high-performance non-precious metal-based electrocatalysts. In this work, bimetallic nitride (Co/WN@NC) was successfully prepared through a one-step high-temperature calcination way using dicyandiamide (DCA), bimetallic polyoxometalates, and cobalt nitrate. Co/WN@NC exhibits outstanding catalytic performance with the same overpotentials of 143 mV in both alkaline and acidic media at 10 mA cm?2. The Tafel slopes are 90 mV dec?1 and 118 mV dec?1, respectively. Co/WN@NC exhibits good stability in acidic and alkaline solutions for up to 30 h. The splendid catalytic performance can be mainly ascribed to the synergistic effect between Co and WN. This work shows experimental guiding significance for preparing simple transition metal-based electrocatalysts. |
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| Keywords: | Polyoxometalate Electrocatalysis Nitrides Hydrogen evolution reaction |
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