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The sluggish kinetics of oxygen evolution reaction (OER) are bottlenecks to develop hydrogen energy based on water electrolysis, which can be significantly improved using high performance catalyst. In this context, the CoNi layered double hydroxide (LDH)/Ti3C2 heterostructures are obtained using electrostatic attraction of the positively charged LDH and negatively charged Ti3C2 nanosheets as catalyst to optimize the OER　performance. Such alternately stacking exhibits good catalytic activity with a lower overpotential and a small Tafel slope, outperforming their individual components. The results by density functional theory (DFT) simulation find that the charge transfers from Ti3C2 to CoNi LDH, not only adjust the electron distribution, but also increase the electron density of the interfacial active sites, thus enhances the electron transfer efficiency inside the heterostructures. Moreover, the cobalt and nickel ions exhibit a synergistic effect in supplying more electrons to adsorb the adjacent intermediates with the active hydrogen and oxygen vacancies, to improve the adsorption capability and reduce the reaction energy barriers. These findings provide a rewarding avenue towards the design of highly efficient electrocatalysts for OER.

権利情報:

• In Copyright
  

キーワード: MXene, Layered double hydroxide, Heterostructure, Oxygen evolution reaction

刊行年月日: 2024-11-21

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• Nanoscale (ISSN: 20403364) vol. 17 issue. 2 p. 1080-1091

研究助成金:

• National Natural Science Foundation of China 22209213
• Natural Science Foundation of Guangdong Province 2022A1515010405
• Japan Society for the Promotion of Science 22K18956
• Natural Science Foundation of Guangdong Province 2024A1515010284

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5336

公開URL: https://doi.org/10.1039/d4nr03679d

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更新時刻: 2025-11-21 08:30:04 +0900

MDRでの公開時刻: 2025-11-21 08:24:28 +0900