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Surface phosphorization coupled polypyrrole modification on CoMoO4 for highly efficient hydrogen evolution
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DOI：10.1016/j.jallcom.2024.176312.png)
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Abstract
En 中文
Highly efficient and stable electrocatalysts toward hydrogen evolution reaction (HER) under large current density are essential for alkaline water splitting. Herein, an active and durable CoMoO4-based HER electrocatalyst is developed, with a coupling of surface phosphorization and polypyrrole (PPy) modification to accelerate water dissociation and prevent alkaline corrosion during HER process, ensuring great catalyst stability. The prepared PPy-CoMoO4/P@NF catalyst achieves perfect HER activity with only 242.1 mV overpotential at the industrial current density of 1000 mAcm(-2) in 1.0 M KOH as well as a low Tafel slope of 39.0 mV dec(-1). Moreover, PPy modification greatly inhibits the alkaline corrosion and the catalyst exhibits stable operation for 100 h at 1000 mAcm(-2) with a conservation rate of 98.5 %. Electrochemical tests and theoretical calculations reveal that the multiple interfaces formed by CoMoO4/CoP/PPy significantly reduce the energy barrier of hydrolysis and improve the interfacial adsorption of H-ads. Meanwhile, the surface phosphating changes the Gibbs free energy of rate-determining step (RDS) from -0.54 to -0.29 eV, optimizing the energy barriers for hydrogen adsorption-desorption. Remarkably, an electrolyzer with PPy-CoMoO4/P @NF as cathode catalyst only needs a cell voltage of 1.92 V at 1000 mA cm(-2) for overall water splitting. This study provides an effective way to develop highly efficient and stable HER catalysts toward industrial water splitting.
Keywords:
CoMoO4
Surface phosphorization
Polypyrrole modification
Hydrogen evolution reaction
Large-current-density electrolysis
Journal
IF:
6.3
Papers:
8.3W
Citations:
24.3W