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Cerium‐Modified Cobalt Iron Alloy for Enhanced Alkaline Water Splitting Performance

Yanbing Huang,Jiawen Wang,Zongli Gu,Yan Liu,Jinli Zhang,Fuxi Bao

Published 2025 in ChemCatChem

ABSTRACT

Developing efficient nonprecious metal catalysts for alkaline water splitting is crucial. Herein, cerium (Ce)‐modified CoFe alloy‐hydroxide catalysts (Ce24%‐CFAH/NF and Ce2%‐CFAH/NF) with oxygen vacancies are synthesized via electrodeposition. Ce introduction significantly enhances catalyst turnover frequency (TOF). For oxygen evolution reaction (OER), Ce24%‐CFAH/NF achieves a TOF of 0.77 s−1 at 1.50 V versus RHE, vastly exceeding CoFe/NF (0.03 s−1). For hydrogen evolution reaction (HER), Ce2%‐CFAH/NF achieves 0.66 s−1 at −0.25 V versus RHE, outperforming CoFe/NF (0.22 s−1). Consequently, Ce24%‐CFAH/NF exhibits excellent OER performance (η10 = 227 mV, Tafel slope = 32.5 mV dec−1), requiring only 290 mV overpotential for 500 mA cm−2 with 85 h stability. Ce2%‐CFAH/NF shows superior HER performance (η10 = 100 mV, Tafel slope = 60.7 mV dec−1). An electrolyzer using both catalysts require only 1.63 V for 10 mA cm−2 and maintains stability (∼100 mA cm−2 for 24 h). The enhanced OER performance is attributed to high oxygen vacancies (3.0 × 1012 spins/mg) and TOF (0.77 s−1), while the HER performance stems from high TOF (0.66 s−1) and large electrochemically active surface area (ECSA: 2.35 mF cm−2/ 58.75 cm2). Furthermore, in situ Raman spectroscopy reveals the generation of highly reactive CoFeOOH phases during the OER process.

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