Electrocatalytic enhancement mechanism of cobalt single atoms anchored on different MXene substrates in oxygen and hydrogen evolution reactions
Abstract Decorating single atoms of transition metals on MXenes to enhance the electrocatalytic properties of the resulting composites is a useful strategy for developing efficient electrocatalysts, and the mechanisms behind this enhancement are under intense scrutiny. Herein, we anchored Co single...
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| Format: | Article |
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Wiley
2023-02-01
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| Series: | EcoMat |
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| Online Access: | https://doi.org/10.1002/eom2.12293 |
| _version_ | 1811291628133941248 |
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| author | Xin Zhao Xuerong Zheng Qi Lu Ying Li Fengping Xiao Bing Tang Shixun Wang Denis Y. W. Yu Andrey L. Rogach |
| author_facet | Xin Zhao Xuerong Zheng Qi Lu Ying Li Fengping Xiao Bing Tang Shixun Wang Denis Y. W. Yu Andrey L. Rogach |
| author_sort | Xin Zhao |
| collection | DOAJ |
| description | Abstract Decorating single atoms of transition metals on MXenes to enhance the electrocatalytic properties of the resulting composites is a useful strategy for developing efficient electrocatalysts, and the mechanisms behind this enhancement are under intense scrutiny. Herein, we anchored Co single atoms onto several commonly used MXene substrates (V2CTx, Nb2CTx and Ti3C2Tx) and systematically studied the electrocatalytic behavior and the mechanisms of oxygen and hydrogen evolution reactions (OER and HER, respectively) of the resulting composites. Co@V2CTx composite displays an OER overpotential of 242 mV and an HER overpotential of 35 mV at 10 mA cm−2 in 1.0 M KOH electrolyte, which is much lower than for Co@Nb2CTx and Co@Ti3C2Tx, making it comparable to the commercial noble metal Pt/C and RuO2/C electrocatalysts. The experimental and theoretical results point out that the enhanced bifunctional catalytic performance of Co@V2CTx benefits from the stronger hybridization between Co 3d and surface terminated O 2p orbitals which optimized the electronic structure of Co single atoms in the composite. This, in turn, results in lowering the OER and HER energy barriers and acceleration of the catalytic kinetics in case of the Co@V2CTx composite. The advantage of Co@V2CTx was further validated by its high overall water splitting performance (1.60 V to deliver 10 mA cm−2). Our study sheds light on the origins of the catalytic activity of single transition metals atoms on MXene substrates, and provides guidelines for designing efficient bifunctional MXene‐based electrocatalysts. |
| first_indexed | 2024-04-13T04:33:12Z |
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| institution | Directory Open Access Journal |
| issn | 2567-3173 |
| language | English |
| last_indexed | 2024-04-13T04:33:12Z |
| publishDate | 2023-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | EcoMat |
| spelling | doaj.art-5c70e2123a724326baf907ee1a60fc5e2022-12-22T03:02:16ZengWileyEcoMat2567-31732023-02-0152n/an/a10.1002/eom2.12293Electrocatalytic enhancement mechanism of cobalt single atoms anchored on different MXene substrates in oxygen and hydrogen evolution reactionsXin Zhao0Xuerong Zheng1Qi Lu2Ying Li3Fengping Xiao4Bing Tang5Shixun Wang6Denis Y. W. Yu7Andrey L. Rogach8Department of Materials Science and Engineering, Center for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR People's Republic of ChinaDepartment of Materials Science and Engineering, Center for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR People's Republic of ChinaState Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering Hainan University Haikou People's Republic of ChinaSchool of Materials Science and Engineering Hebei University of Technology Tianjin People's Republic of ChinaDepartment of Materials Science and Engineering, Center for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR People's Republic of ChinaDepartment of Materials Science and Engineering, Center for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR People's Republic of ChinaDepartment of Materials Science and Engineering, Center for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR People's Republic of ChinaSchool of Energy and Environment and Center of Super‐Diamond and Advanced Films (COSDAF) City University of Hong Kong Hong Kong SAR People's Republic of ChinaDepartment of Materials Science and Engineering, Center for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR People's Republic of ChinaAbstract Decorating single atoms of transition metals on MXenes to enhance the electrocatalytic properties of the resulting composites is a useful strategy for developing efficient electrocatalysts, and the mechanisms behind this enhancement are under intense scrutiny. Herein, we anchored Co single atoms onto several commonly used MXene substrates (V2CTx, Nb2CTx and Ti3C2Tx) and systematically studied the electrocatalytic behavior and the mechanisms of oxygen and hydrogen evolution reactions (OER and HER, respectively) of the resulting composites. Co@V2CTx composite displays an OER overpotential of 242 mV and an HER overpotential of 35 mV at 10 mA cm−2 in 1.0 M KOH electrolyte, which is much lower than for Co@Nb2CTx and Co@Ti3C2Tx, making it comparable to the commercial noble metal Pt/C and RuO2/C electrocatalysts. The experimental and theoretical results point out that the enhanced bifunctional catalytic performance of Co@V2CTx benefits from the stronger hybridization between Co 3d and surface terminated O 2p orbitals which optimized the electronic structure of Co single atoms in the composite. This, in turn, results in lowering the OER and HER energy barriers and acceleration of the catalytic kinetics in case of the Co@V2CTx composite. The advantage of Co@V2CTx was further validated by its high overall water splitting performance (1.60 V to deliver 10 mA cm−2). Our study sheds light on the origins of the catalytic activity of single transition metals atoms on MXene substrates, and provides guidelines for designing efficient bifunctional MXene‐based electrocatalysts.https://doi.org/10.1002/eom2.12293Co single‐atom catalysthydrogen evolutionMXene substratesoxygen evolutionwater splitting |
| spellingShingle | Xin Zhao Xuerong Zheng Qi Lu Ying Li Fengping Xiao Bing Tang Shixun Wang Denis Y. W. Yu Andrey L. Rogach Electrocatalytic enhancement mechanism of cobalt single atoms anchored on different MXene substrates in oxygen and hydrogen evolution reactions EcoMat Co single‐atom catalyst hydrogen evolution MXene substrates oxygen evolution water splitting |
| title | Electrocatalytic enhancement mechanism of cobalt single atoms anchored on different MXene substrates in oxygen and hydrogen evolution reactions |
| title_full | Electrocatalytic enhancement mechanism of cobalt single atoms anchored on different MXene substrates in oxygen and hydrogen evolution reactions |
| title_fullStr | Electrocatalytic enhancement mechanism of cobalt single atoms anchored on different MXene substrates in oxygen and hydrogen evolution reactions |
| title_full_unstemmed | Electrocatalytic enhancement mechanism of cobalt single atoms anchored on different MXene substrates in oxygen and hydrogen evolution reactions |
| title_short | Electrocatalytic enhancement mechanism of cobalt single atoms anchored on different MXene substrates in oxygen and hydrogen evolution reactions |
| title_sort | electrocatalytic enhancement mechanism of cobalt single atoms anchored on different mxene substrates in oxygen and hydrogen evolution reactions |
| topic | Co single‐atom catalyst hydrogen evolution MXene substrates oxygen evolution water splitting |
| url | https://doi.org/10.1002/eom2.12293 |
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