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

Lu, Shun, Hummel, Matthew, Gu, Zhengrong, Wang, Yucheng, Wang, Keliang, Pathak, Rajesh, Zhou, Yue, Jia, Hongxing, Qi, Xueqiang, Zhao, Xianhui, Xu, Ben 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) , 1703–1713. 10.1021/acssuschemeng.0c07614

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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
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	American Chemical Society
ISSN:	2168-0485
Last Modified:	24 Mar 2023 10:15
URI:	https://orca.cardiff.ac.uk/id/eprint/155262

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