Preparation of cobalt-iron hydrogen phosphite bifunctional water electrolysis catalyst by one-step electrodeposition

doi:10.11949/0438-1157.20250209

Abstract

Abstract:

Electrolysis of water to produce hydrogen has the advantages of being green and efficient, but is limited by the slow kinetics and high cost of precious metal catalysts, and it is urgent to develop efficient and stable non-precious metal catalysts. An Fe-doped cobalt hydrogen phosphite [Fe-Co(H₂PO₂)₂] catalyst is synthesized via a one-step electrodeposition method on a nickel foam substrate. Structural analyses reveal that Fe-Co(H₂PO₂)₂ adopts a self-supported microspherical architecture with an amorphous nature, significantly increasing the exposure of electrochemically active sites. Moreover, Fe-doping effectively modulates the electronic structure of Co(H₂PO₂)₂, enhancing charge transfer efficiency and accelerating electrocatalytic reaction kinetics. The electrochemical test results show that the overpotentials of hydrogen and oxygen evolution of Fe-Co(H₂PO₂)₂ at a current density of 10 mA·cm^-2 are 24 mV and 220 mV, respectively, and it can work stably for 40 h at 50 mA·cm^-2, showing excellent bifunctional electrocatalytic activity and good stability, and has broad application prospects in the field of water electrolysis and hydrogen production.

Key words: electrochemistry, catalysis, water electrolysis, hydrogen production, bifunctional catalyst, doping engineering

摘要：

电解水制氢具有绿色高效的优势，但受限于动力学缓慢及贵金属催化剂成本高，亟需开发高效稳定的非贵金属催化剂。以泡沫镍为基底，采用一步电沉积法制备Fe掺杂Co(H₂PO₂)₂催化剂[Fe-Co(H₂PO₂)₂]。研究表明，该催化剂形成三维自支撑微球结构，并呈现无定形特征，从而显著提高电化学活性位点的暴露度。此外，Fe掺杂有效调控Co(H₂PO₂)₂的电子结构，增强电荷传输能力，加速催化反应动力学。电化学测试结果显示，Fe-Co(H₂PO₂)₂在10 mA·cm^-2电流密度下的析氢和析氧过电位分别为24 mV和220 mV，并可在50 mA·cm^-2下稳定工作40 h，展现出优异的双功能电催化活性和良好的稳定性，在电解水制氢领域具有广阔的应用前景。

关键词: 电化学, 催化, 电解水, 制氢, 双功能催化剂, 掺杂工程

CLC Number:

TQ 151.1

Kun ZHANG, Tieshan ZOU, Haifeng ZHANG, Xiaotong HAN, Yanxiong FANG. Preparation of cobalt-iron hydrogen phosphite bifunctional water electrolysis catalyst by one-step electrodeposition[J]. CIESC Journal, 2025, 76(10): 5141-5149.

张坤, 邹铁山, 张海丰, 韩晓彤, 方岩雄. 一步电沉积法制备钴铁亚磷酸氢盐双功能电解水催化剂[J]. 化工学报, 2025, 76(10): 5141-5149.

Figures/Tables 6

Fig.1 SEM and TEM images of Fe-Co(H2PO2)2

Fig.2 XRD pattern and XPS spectra of Fe-Co(H2PO2)2

Fig.3 Electrocatalytic HER performance of Fe-Co(H2PO2)2

Fig.4 Electrocatalytic OER performance of Fe-Co(H2PO2)2

Fig.5 Overall water splitting performance of Fe-Co(H2PO2)2

Fig.6 Electrocatalytic mechanism analysis of Fe-Co(H2PO2)2

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