Iron-modulated nickel cobalt phosphide embedded in carbon to boost power density of hybrid sodium–air battery

Kang, Yao, Wang, Shuo, Zhu, Siqi, Gao, Haixing, Hui, Kwan San, Yuan, Cheng Zong, Yin, Hong, Bin, Feng, Wu, Xi Lin, Mai, Wenjie, Zhu, Ling, Hu, Maocong, Liang, Feng, Chen, Fuming and Hui, Kwun Nam (2021) Iron-modulated nickel cobalt phosphide embedded in carbon to boost power density of hybrid sodium–air battery. Applied Catalysis B: Environmental, 285. ISSN 0926-3373

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Abstract

Nickel cobalt phosphide (NiCoP) is emerging as a potential electrocatalyst towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). However, its ORR/OER activities are sluggish. Here, we investigated the roles of iron dopants in the Fe-doped NiCoP (Fe–NiCoP) in order to boost its ORR/OER kinetics. The density functional theory (DFT) calculations reveal that the Fe dopant effectively modulates the electron conductivity of NiCoP and reduces binding energies of the reaction intermediates towards rate-determining steps of ORR and OER. A binder-free 3D microflowers morphology of the Fe–NiCoP embedded in the amorphous carbon layer (Fe–NiCoP@C) catalyst on the nickel foam was prepared as the air cathode for the hybrid sodium-air battery (HSAB). The HSAB displays a discharge voltage of 2.74 V at 0.01 mA cm−2 with excellent round trip efficiency of 93.26 % at the 500th cycle and state-of-the-art power density of 621 mW g−1.

Item Type: Article
Uncontrolled Keywords: dft calculation,electronic structure reformation,hybrid sodium-air battery,iron doping,nickel cobalt phosphide,catalysis,environmental science(all),process chemistry and technology ,/dk/atira/pure/subjectarea/asjc/1500/1503
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Depositing User: LivePure Connector
Date Deposited: 09 Feb 2021 01:04
Last Modified: 01 Apr 2021 00:37
URI: https://ueaeprints.uea.ac.uk/id/eprint/79197
DOI: 10.1016/j.apcatb.2020.119786

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