CeO2 for modulating the electronic structure of nickel-cobalt bimetallic phosphides to promote efficient overall water splitting

[Display omitted] •Nanoneedle catalysts with core-shell structure were formed at room temperature.•CeO2 adjusted and optimized the electronic structure of transition metal phosphides.•The catalysts exhibited excellent catalytic activities for both HER and OER.•The synthesized catalysts exhibited goo...

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Bibliographic Details
Published in:Journal of colloid and interface science 2024-05, Vol.661, p.690-699
Main Authors: Li, Yutong, Yi, Jianhui, qin, Ruige, Xie, Chenxu, Zhao, Lijun, Lang, Xingyou, Jiang, Qing
Format: Article
Language:English
Subjects:
Bifunctional catalysts
Cerium dioxide
Modulation of electronic structure
Transition metal phosphides
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Summary:[Display omitted] •Nanoneedle catalysts with core-shell structure were formed at room temperature.•CeO2 adjusted and optimized the electronic structure of transition metal phosphides.•The catalysts exhibited excellent catalytic activities for both HER and OER.•The synthesized catalysts exhibited good structural stability. The discovery of earth-abundant electrocatalysts to replace platinum and iridium for overall water splitting is a crucial step in reducing the cost of green hydrogen production. Transition metal phosphides have drawn wide attention due to their non-toxicity, good chemical stability, low cost, and stable catalytic activity in alkaline electrolytes. We report a three-dimensional flower-like structure composed of core-shell nanoneedles as catalysts, in which CeO2 is introduced on the surface of nickel cobalt bimetallic phosphide through electrodeposition. And X-ray photoelectron spectroscopy testing and DFT calculations show electron coupling and transfer between CeO2 and CoP3, thereby modulating the electronic structure of the catalyst surface and reducing the adsorption energy of H atoms during the catalytic process, resulting in enhanced catalytic activity. In 1 M KOH, it exhibits a low overpotential of 109 and 296 mV to achieve the current density of 50 mA cm−2 for HER and OER, respectively. When used as both cathode and anode as a bifunctional catalyst, a voltage of only 1.77 V is required to achieve a current density of 50 mA cm−2, demonstrating great industrial potential.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2024.01.098