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 ORCID:, 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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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
Faculty \ School: Faculty of Science > School of Engineering
UEA Research Groups: Faculty of Science > Research Groups > Energy Materials Laboratory
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Depositing User: LivePure Connector
Date Deposited: 09 Feb 2021 01:04
Last Modified: 23 Oct 2022 02:12
DOI: 10.1016/j.apcatb.2020.119786


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