X-ray Insights into Formation of -O Functional Groups on MXenes : Two-Step Dehydrogenation of Adsorbed Water
Engineered MXene surfaces with more -O functional groups are feasible for realizing higher energy density due to their higher theoretical capacitance. However, there have been only a few explorations of this regulation mechanism. Investigating the formation source and mechanism is conducive to expanding the adjustment method from the top-down perspective. Herein, for the first time, the formation dynamics of -O functional groups on Mo2CTx are discovered as a two-step dehydrogenation of adsorbed water through in situ near-ambient-pressure X-ray photoelectron spectroscopy, further confirmed by ab initio molecular dynamics simulations. From this, the controllable substitution of -F functional groups with -O functional groups is achieved on Mo2CTx during electrochemical cycling in an aqueous electrolyte. The obtained Mo2CTx with rich -O groups exhibits a high capacitance of 163.2 F g -1 at 50 mV s -1, together with excellent stability. These results offer new insights toward engineering surface functional groups of MXenes for many specific applications.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:23 |
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| Enthalten in: |
Nano letters - 23(2023), 4 vom: 22. Feb., Seite 1401-1408 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Zhang, Pengjun [VerfasserIn] |
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| Links: |
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| Themen: |
−O functional groups |
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| Anmerkungen: |
Date Completed 17.04.2023 Date Revised 17.04.2023 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1021/acs.nanolett.2c04712 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM352258985 |
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| 500 | |a Date Revised 17.04.2023 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a Engineered MXene surfaces with more -O functional groups are feasible for realizing higher energy density due to their higher theoretical capacitance. However, there have been only a few explorations of this regulation mechanism. Investigating the formation source and mechanism is conducive to expanding the adjustment method from the top-down perspective. Herein, for the first time, the formation dynamics of -O functional groups on Mo2CTx are discovered as a two-step dehydrogenation of adsorbed water through in situ near-ambient-pressure X-ray photoelectron spectroscopy, further confirmed by ab initio molecular dynamics simulations. From this, the controllable substitution of -F functional groups with -O functional groups is achieved on Mo2CTx during electrochemical cycling in an aqueous electrolyte. The obtained Mo2CTx with rich -O groups exhibits a high capacitance of 163.2 F g -1 at 50 mV s -1, together with excellent stability. These results offer new insights toward engineering surface functional groups of MXenes for many specific applications | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a AIMD simulations | |
| 650 | 4 | |a Mo2CTx MXene | |
| 650 | 4 | |a NAP-XPS | |
| 650 | 4 | |a supercapacitors | |
| 650 | 4 | |a −O functional groups | |
| 700 | 1 | |a Shou, Hongwei |e verfasserin |4 aut | |
| 700 | 1 | |a Xia, Yujian |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Changda |e verfasserin |4 aut | |
| 700 | 1 | |a Wei, Shiqiang |e verfasserin |4 aut | |
| 700 | 1 | |a Xu, Wenjie |e verfasserin |4 aut | |
| 700 | 1 | |a Chen, Yihong |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Zehua |e verfasserin |4 aut | |
| 700 | 1 | |a Guo, Xin |e verfasserin |4 aut | |
| 700 | 1 | |a Zhu, Kefu |e verfasserin |4 aut | |
| 700 | 1 | |a Cao, Yuyang |e verfasserin |4 aut | |
| 700 | 1 | |a Wu, Xiaojun |e verfasserin |4 aut | |
| 700 | 1 | |a Chen, Shuangming |e verfasserin |4 aut | |
| 700 | 1 | |a Song, Li |e verfasserin |4 aut | |
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