Adjusting electronic structure coupling of Fe–Ni2P (NiFeP-MOF) multilevel structure for ultra-activity and durable catalytic water oxidation. (19th August 2022)

• Record Type: Journal Article
• Authors: Qiu, Shipeng; Hao, Shuhua; Xing, Yupeng; Huang, Jinzhao; Wang, Xiao; Ding, Meng; Zhao, Gang; Zhang, Baojie; Zhang, Yafang
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 71(2022)
• Page Start: 30472
• Page End: 30483
• Publication Date: 2022-08-19
• Subjects: Phosphorus-engineered -- Ni-MOF -- Fe–Ni2P electrocatalyst -- Multilevel structure -- Oxygen evolution reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.07.013
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Efficient electrocatalyst for alkaline oxygen evolution reaction is the critical core to the wide application of metal-air energy storage and water electrolysis hydrogen energy. Therefore, appropriate design of highly active and stable non-noble metal oxygen evolution electrocatalyst with good electronic structure and multilevel structure is both a goal and a challenge. Here, we report a Fe–Ni2 P electrocatalyst (NiFeP-MOF) with multilevel structure, which was obtained by anion exchange on the basis of Fe–Ni(OH)2 (NiFe-MOF) grown on nickel foam in situ by solvothermal method. As expected, Fe substitution regulates the Ni oxidation state in the NiFeP-MOF and realizes electronic structure coupling, showing a highly active and stable oxygen evolution reaction (OER) in alkaline electrolyte solution. Specifically, the NiFeP-MOF demonstrates an ultralow overpotentials (232 mV, 10 mA cm −2 ; 267 mV 100 mA cm −2 ), respectively, an extremely small Tafel slope (34 mV dec −1 ). Separately, the electrocatalyst shows an excellent cycle stability at 10 mA cm −2 for 12 h (43, 200 s). More importantly, this work come up with an available policy for the preparation of excellent alkaline hydrolysis electrolysis catalysts and air cathodes with excellent performance. Highlights: Fe–Ni2 P (NiFeP-MOF) electrocatalyst with multilevel structure is obtained. The synthesized catalysts have excellent OER performance and catalytic stability. The catalyst with Ni:Fe ratio of 2:1 has high activity and good stability. Fe substitution regulates the Ni oxidation state realizes electronic structure coupling.