Promoting the water-reduction kinetics and alkali tolerance of MoNi₄ nanocrystals via a Mo₂TiC₂Tx induced built-in electric field
Mo-Ni alloy-based electrocatalysts are regarded as promising candidates for the hydrogen evolution reaction (HER), despite their vulnerable stability in alkaline solution that hampers further application. Herein, Mo2 TiC2 Tx MXene, is employed as a support for MoNi4 alloy nanocrystals (NCs) to fabri...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2022
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| Online Access: | https://hdl.handle.net/10356/161872 |
| _version_ | 1826124727862689792 |
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| author | Zhao, Xiangyuan Tang, Kewei Lee, Carmen Du, Cheng-Feng Yu, Hong Wang, Xiaomei Qi, Weihong Ye, Qian Yan, Qingyu |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Zhao, Xiangyuan Tang, Kewei Lee, Carmen Du, Cheng-Feng Yu, Hong Wang, Xiaomei Qi, Weihong Ye, Qian Yan, Qingyu |
| author_sort | Zhao, Xiangyuan |
| collection | NTU |
| description | Mo-Ni alloy-based electrocatalysts are regarded as promising candidates for the hydrogen evolution reaction (HER), despite their vulnerable stability in alkaline solution that hampers further application. Herein, Mo2 TiC2 Tx MXene, is employed as a support for MoNi4 alloy nanocrystals (NCs) to fabricate a unique nanoflower-like MoNi4 -MXn electrocatalyst. A remarkably strong built-in electric field is established at the interface of two components, which facilitates the electron transfer from Mo2 TiC2 Tx to MoNi4 . Due to the accumulation of electrons at the MoNi4 sites, the adsorption of the catalytic intermediates and ionic species on MoNi4 is affected consequently. As a result, the MoNi4 -MX10 nanohybrid exhibits the lowest overpotential, even lower than 10% Pt/C catalyst at the current density of 10 mA cm-2 in 1 m KOH solution (122.19 vs 129.07 mV, respectively). Furthermore, a lower Tafel slope of 55.88 mV dec-1 is reported as compared to that of the 10% Pt/C (65.64 mV dec-1 ). Additionally, the MoNi4 -MX10 catalyst also displays extraordinary chemical stability in alkaline solution, with an activity loss of only 0.15% per hour over 300 h of operation. This reflects the great potential of using MXene-based interfacial engineering for the synthesis of a highly efficient and stable electrocatalyst. |
| first_indexed | 2024-10-01T06:25:23Z |
| format | Journal Article |
| id | ntu-10356/161872 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:25:23Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1618722022-09-22T07:02:18Z Promoting the water-reduction kinetics and alkali tolerance of MoNi₄ nanocrystals via a Mo₂TiC₂Tx induced built-in electric field Zhao, Xiangyuan Tang, Kewei Lee, Carmen Du, Cheng-Feng Yu, Hong Wang, Xiaomei Qi, Weihong Ye, Qian Yan, Qingyu School of Materials Science and Engineering Engineering::Materials Electrocatalyst Hydrogen Evolution Reaction Mo-Ni alloy-based electrocatalysts are regarded as promising candidates for the hydrogen evolution reaction (HER), despite their vulnerable stability in alkaline solution that hampers further application. Herein, Mo2 TiC2 Tx MXene, is employed as a support for MoNi4 alloy nanocrystals (NCs) to fabricate a unique nanoflower-like MoNi4 -MXn electrocatalyst. A remarkably strong built-in electric field is established at the interface of two components, which facilitates the electron transfer from Mo2 TiC2 Tx to MoNi4 . Due to the accumulation of electrons at the MoNi4 sites, the adsorption of the catalytic intermediates and ionic species on MoNi4 is affected consequently. As a result, the MoNi4 -MX10 nanohybrid exhibits the lowest overpotential, even lower than 10% Pt/C catalyst at the current density of 10 mA cm-2 in 1 m KOH solution (122.19 vs 129.07 mV, respectively). Furthermore, a lower Tafel slope of 55.88 mV dec-1 is reported as compared to that of the 10% Pt/C (65.64 mV dec-1 ). Additionally, the MoNi4 -MX10 catalyst also displays extraordinary chemical stability in alkaline solution, with an activity loss of only 0.15% per hour over 300 h of operation. This reflects the great potential of using MXene-based interfacial engineering for the synthesis of a highly efficient and stable electrocatalyst. Ministry of Education (MOE) The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. 51901189 and 51802265), China Postdoctoral Science Foundation Grant (No. 2020M683552), and the Natural Science Foundation of Chongqing (No. cstc2020jcyj-msxmX0859). Q.Y. acknowledges the funding support from Singapore MOE AcRF Tier 1 grant No. 2020-T1-001-03. 2022-09-22T07:02:18Z 2022-09-22T07:02:18Z 2022 Journal Article Zhao, X., Tang, K., Lee, C., Du, C., Yu, H., Wang, X., Qi, W., Ye, Q. & Yan, Q. (2022). Promoting the water-reduction kinetics and alkali tolerance of MoNi₄ nanocrystals via a Mo₂TiC₂Tx induced built-in electric field. Small, 18(15), 2107541-. https://dx.doi.org/10.1002/smll.202107541 1613-6810 https://hdl.handle.net/10356/161872 10.1002/smll.202107541 35254002 2-s2.0-85125625711 15 18 2107541 en MOE-2020-T1-001-03 Small © 2022 Wiley-VCH GmbH. All rights reserved. |
| spellingShingle | Engineering::Materials Electrocatalyst Hydrogen Evolution Reaction Zhao, Xiangyuan Tang, Kewei Lee, Carmen Du, Cheng-Feng Yu, Hong Wang, Xiaomei Qi, Weihong Ye, Qian Yan, Qingyu Promoting the water-reduction kinetics and alkali tolerance of MoNi₄ nanocrystals via a Mo₂TiC₂Tx induced built-in electric field |
| title | Promoting the water-reduction kinetics and alkali tolerance of MoNi₄ nanocrystals via a Mo₂TiC₂Tx induced built-in electric field |
| title_full | Promoting the water-reduction kinetics and alkali tolerance of MoNi₄ nanocrystals via a Mo₂TiC₂Tx induced built-in electric field |
| title_fullStr | Promoting the water-reduction kinetics and alkali tolerance of MoNi₄ nanocrystals via a Mo₂TiC₂Tx induced built-in electric field |
| title_full_unstemmed | Promoting the water-reduction kinetics and alkali tolerance of MoNi₄ nanocrystals via a Mo₂TiC₂Tx induced built-in electric field |
| title_short | Promoting the water-reduction kinetics and alkali tolerance of MoNi₄ nanocrystals via a Mo₂TiC₂Tx induced built-in electric field |
| title_sort | promoting the water reduction kinetics and alkali tolerance of moni₄ nanocrystals via a mo₂tic₂tx induced built in electric field |
| topic | Engineering::Materials Electrocatalyst Hydrogen Evolution Reaction |
| url | https://hdl.handle.net/10356/161872 |
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