Self-grown NiCuOx hybrids on a porous NiCuC substrate as an HER cathode in alkaline solution.
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| Title: | Self-grown NiCuOx hybrids on a porous NiCuC substrate as an HER cathode in alkaline solution. |
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| Authors: | Yu, Linping1,2 (AUTHOR), Dang, Yanliu2 (AUTHOR), Zeng, Julan1 (AUTHOR), He, Junkai2 (AUTHOR), Murphy, Steven C.2 (AUTHOR), Kerns, Peter2 (AUTHOR), Suib, Steven L.1,2 (AUTHOR) steven.suib@uconn.edu, Zhang, Jian1,3 (AUTHOR) zj4343@163.com, Dou, Yuhai1,4 (AUTHOR) y.dou@griffith.edu.au |
| Source: | Applied Surface Science. Jun2020, Vol. 515, pN.PAG-N.PAG. 1p. |
| Subjects: | Alkaline solutions, Electrocatalysis, Hydrogen evolution reactions, Oxygen evolution reactions, Catalytic activity, Catalysis, Potassium hydroxide |
| Abstract: | • A porous NiCuC substrate was adopted to develop a multi-porous NiCuO x /NiCuC catalyst. • The NiCuO x /NiCuC has an overpotential of 116 mV at the current density of 10 mA cm−2. • The NiCuO x hybrids enable more ions and electrons access to the interface. • The strategy is applicable to synthesize a variety of multi-porous electrocatalysts. Electrocatalysts converted directly from the substrates hold the key to achieve high catalytic activity and durability due to their high bonding strength, intimate electronic contact, and tunable phase composition. Herein, an electrically conductive porous NiCuC substrate was adopted to develop a multi-porous NiCuO x /NiCuC hydrogen evolution reaction (HER) catalyst using a one-step oxidation method in this research. The NiCuO x hybrids were characterized as three typical layers: an outer layer with NiCuO 2 solid solution phase, a partially oxidized intermediate layer, and an inner layer with limited stable oxygen content. The NiCuO x /NiCuC possesses abundant Ni(Ⅱ)-Cu(Ⅱ) sites to accelerate the Volmer step via the electrostatic effect with OH–, numerous metallic NiCu sites to facilitate the H adsorption, and highly accessible channels to promote the Heyrovsky step during HER catalysis. As a result, high electrocatalytic performance was obtained with an overpotential of 116 mV at a current density of 10 mA cm−2 in 1.0 M potassium hydroxide, and a stable catalytic performance during the HER process for more than 24 h. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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