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Iron-Tuned 3D Cobalt–Phosphate Catalysts for Efficient Hydrogen and Oxygen Evolution Reactions Over a Wide pH Range

Chuang YangKey Laboratory of Ionic Liquids Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, No. 68 Wen Chang Road, 121 Street, Kunming 650093, P.R. ChinaTianwei HeSchool of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology (QUT), 2 George Street, Brisbane City, Queensland 4000, AustraliaWeizhong ZhouKey Laboratory of Ionic Liquids Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, No. 68 Wen Chang Road, 121 Street, Kunming 650093, P.R. ChinaRongrong DengKey Laboratory of Ionic Liquids Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, No. 68 Wen Chang Road, 121 Street, Kunming 650093, P.R. ChinaQibo ZhangKey Laboratory of Ionic Liquids Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, No. 68 Wen Chang Road, 121 Street, Kunming 650093, P.R. China

2020en

ABI

Annotatsiya

The design and synthesis of highly efficient and low-cost bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are crucial for electrochemical water splitting associated with clean and renewable energy technologies. In this study, a novel Fe-doped cobalt–phosphate nanosheet-packed 3D microsphere developed on a planar Cu substrate (FexCo3–x(PO4)2/Cu) with a tunable stoichiometry (x = 0–0.64) is fabricated using a facile one-step electrodeposition approach from a Reline-based deep eutectic solvent. The Fe-tuned integrated electrode exhibits superior HER electrocatalytic performance over a wide pH range and robust bifunctional catalytic activity for overall water splitting in alkaline media. The optimized Fe0.43Co2.57(PO4)2/Cu needs overpotentials of only 108.1, 128.8, and 291.5 mV to drive a promising current density of 100 mA cm–2 in 1.0 M KOH, 0.5 M H2SO4, and 1.0 M phosphate-buffered saline, respectively, along with outstanding durability. Moreover, the developed Fe0.43Co2.57(PO4)2/Cu can catalyze both HER and OER in 1.0 M KOH with high efficiency and robust stability over 100 h. The remarkably enhanced performance of the integrated FexCo3–x(PO4)2/Cu can be ascribed to the modification of the O active electronic property in phosphate with Fe doping, which results in optimal hydrogen adsorption on the active sites. Further, the unique 3D microsphere structure coupled with a 2D nanosheet internal architecture offers abundant catalytic interfaces with more active sites and favorable transfer kinetics. All these synergistically contribute to its superior electrochemical performance.

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Identifikatorlar

DOI: 10.1021/acssuschemeng.0c04966

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