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:, Dinh, Duc Anh, Fan, Xi, Bin, Feng, Chen, Fuming and Hui, Kwun Nam (2023) Topological defect and sp3/sp2 carbon interface derived from ZIF-8 with linker vacancies for oxygen reduction reaction. Carbon, 203. pp. 76-87. ISSN 0008-6223

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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
Additional Information: Funding information: This work was supported by the Science and Technology Development Fund (FDCT) of Macao S.A.R. (0041/2019/A1, 0046/2019/AFJ, 0021/2019/AIR, 0032/2021/ITP), the University of Macau (MYRG2018-00192-IAPME, MYRG2020-00187-IAPME), Beijing Municipal Natural Science Foundation (2214060), and the UEA funding. The DFT calculations were performed at the High-Performance Computing Cluster (HPCC) of the Information and Communication Technology Office (ICTO) at the University of Macau.
Faculty \ School: Faculty of Science > School of Engineering
UEA Research Groups: Faculty of Science > Research Groups > Emerging Technologies for Electric Vehicles (EV)
Faculty of Science > Research Groups > Energy Materials Laboratory
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Depositing User: LivePure Connector
Date Deposited: 27 Oct 2022 10:30
Last Modified: 20 Oct 2023 01:38
DOI: 10.1016/j.carbon.2022.10.030


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