Topological defect and sp3/sp2 carbon interface derived from ZIF-8 with linker vacancies for oxygen reduction reaction

Gao, Haixing, Wang, Shuo, Cheong, Weng-Chon (max), Wang, Kaixi, Xu, Huifang, Huang, Aijian, Ma, Junguo, Li, Jiazhan, Ip, Weng-Fai (andy), San Hui, Kwan ORCID: https://orcid.org/0000-0001-7089-7587, Dinh, Duc Anh, Fan, Xi, Bin, Feng, Chen, Fuming and Hui, Kwun Nam (2022) Topological defect and sp3/sp2 carbon interface derived from ZIF-8 with linker vacancies for oxygen reduction reaction. Carbon. ISSN 0008-6223

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Abstract

Defects in nanocarbon materials can trigger their intriguing electrochemical properties and potential applications, but their synthesis is challenging. Herein, we report the synthesis of ultrathin nitrogen-doped carbon nanosheets with intrinsic defects through the pyrolysis of ZIF-8 with linker vacancies. The as-synthesized electrocatalyst exhibits excellent oxygen reduction reaction (ORR) activity with an onset potential and half-wave potential of 1.05 and 0.873 V vs. RHE, respectively, outperforming the reported metal-free ORR electrocatalysts. It also shows a commercial Pt/C-comparable performance in zinc–air battery with a power density of 154.4 mW cm−2. Characterization and DFT calculation results suggest the adjacent sp3-carbon in carbon pentagon can significantly strengthen the adsorption and activation of oxygen molecules on sp2-carbon, hence the potential determining step is altered and ORR overpotential is lowered. This work highlights a promising green synthesis strategy of MOF-derived metal-free nanocarbon materials for wide application in advanced energy technologies.

Item Type: Article
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Depositing User: LivePure Connector
Date Deposited: 27 Oct 2022 10:30
Last Modified: 27 Oct 2022 10:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/89389
DOI: 10.1016/j.carbon.2022.10.030

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