Highly efficient urea oxidation via nesting nano nickel oxide in eggshell membrane-derived carbon

Lu, Shun, Hummel, Matthew, Gu, Zhengrong, Wang, Yucheng, KeWang, Keliang, Pathak, Rajesh, Zhou, Yue Zhou, Jia, Hongxing, Qi, Xueqiang, Xu, Bin and Liu, Xiaoteng (2021) Highly efficient urea oxidation via nesting nano nickel oxide in eggshell membrane-derived carbon. ACS Sustainable Chemistry and Engineering, 9 (4). pp. 1703-1713. ISSN 2168-0485

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Official URL: https://doi.org/10.1021/acssuschemeng.0c07614

Abstract

Here, we reported a strategy of using an eggshell membrane to produce hierarchically porous carbon as a low-cost substrate for synthesizing a nano-nickel oxide catalyst (C@NiO), which can effectively turn biowaste—urea—into energy through an electrochemical approach. The interwoven carbon networks within NiO led to highly efficient urea oxidation due to the strong synergistic effect. The as-prepared electrode only needed 1.36 V versus reversible hydrogen electrode to realize a high efficiency of 10 mA cm–2 in 1.0 M KOH with 0.33 M urea and delivered an even higher current density of 25 mA cm–2 at 1.46 V, which is smaller than that of the porous carbon and commercial Pt/C catalyst. Benefiting from theoretical calculations, Ni(III) active species and the porous carbon further enabled the electrocatalyst to effectively inhibit the “CO2 poisoning” of electrocatalysts, as well as ensuring its superior performance for urea oxidation.

Item Type: Article
Uncontrolled Keywords: nickel oxide, eggshell membrane, porous carbon substrate, urea oxidation, density functional theory
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 07 Jan 2021 11:47
Last Modified: 31 Jul 2021 17:00
URI: http://nrl.northumbria.ac.uk/id/eprint/45146

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