Boosting the bifunctionality and durability of cobalt-fluoride-oxide nanosheets for alkaline water splitting through nitrogen-plasma-promoted electronic regulation and structural reconstruction

Wang, Shuo, Yuan, Cheng Zong, Zheng, Yunshan, Kang, Yao, Hui, Kwan San ORCID: https://orcid.org/0000-0001-7089-7587, Wang, Kaixi, Gao, Haixing, Dinh, Duc Anh, Cho, Young Rae and Hui, Kwun Nam (2024) Boosting the bifunctionality and durability of cobalt-fluoride-oxide nanosheets for alkaline water splitting through nitrogen-plasma-promoted electronic regulation and structural reconstruction. ACS Catalysis, 14 (5). pp. 3616-3626. ISSN 2155-5435

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Abstract

Designing cost-effective and durable bifunctional electrocatalysts with high activity for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is crucial for large-scale hydrogen production through water splitting. However, many electrocatalysts undergo surface or bulk reconstruction, leading to an unstable catalytic activity. In this study, we present a facile N2 plasma strategy to enhance the electrocatalytic activity of cobalt-fluoride-oxide (CoFO, herein NCoFO) nanosheets while maintaining reasonably stable performance. The optimized NCoFO nanosheets grown on carbon cloth through a 60 s N2 plasma treatment (NCoFO/CC-60) exhibit remarkable performance with low overpotentials of 203 mV and 230 mV at 10 mA cm-2 for the HER and the OER, respectively. Density functional theory calculations revealed that the enhanced catalytic performance is attributed to the regulated local electronic configuration resulting from plasma treatment. Furthermore, the assembled alkaline electrolyzer NCoFO/CC-60||NCoFO/CC-60 requires an extremely low voltage of 1.48 V to attain 10 mA cm-2 for over a 150 h operation, which is superior to the values obtained for Pt/C||RuO2 (1.50 V) and CoFO/CC||CoFO/CC (1.55 V).

Item Type:	Article
Additional Information:	Funding Information: This work was financially supported by the Science and Technology Development Fund, Macau SAR (File Nos. 0046/2019/AFJ, 0041/2019/A1, 0007/2021/AGJ, 0070/2023/AFJ), the University of Macau (File Nos. MYRG2018-00192-IAPME, MYRG2020-00187-IAPME, MYRG2022-00223-IAPME), the Natural Science Foundation and Overseas Talent Projects of Jiangxi Province (20232BAB214025, 20232BCJ25044), the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. RS-2023-00276980), and the UEA funding. The DFT calculations are performed at High-Performance Computing Cluster (HPCC) of Information and Communication Technology Office (ICTO) at the University of Macau.
Uncontrolled Keywords:	bulk reconstruction,electronic structure reformation,metal−fluoride oxides,n plasma,water splitting,catalysis,chemistry(all),sdg 7 - affordable and clean energy ,/dk/atira/pure/subjectarea/asjc/1500/1503
Faculty \ School:	Faculty of Science > School of Engineering
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	05 Apr 2024 08:32
Last Modified:	09 Apr 2024 15:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/94823
DOI:	10.1021/acscatal.4c00294

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