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Title: | Regulating d-Band Center of Ti2C MXene Via Nb Alloying for Stable and High-Efficient Supercapacitive Performances | Authors: | Guan, Yunfeng Cong, Ye Zhao, Rong Li, Ke Li, Xuanke Zhu , Hui Zhang, Qin Dong, Zhijun YANG, Nianjun |
Issue Date: | 2023 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | Small, 19 (35) (Art N° 2301276) | Abstract: | Ti2C MXene with the lowest formula weight is expected to gain superior advantages in gravimetric capacitances over other heavier MXenes. Nevertheless, its poor chemical and electrochemical stability is the most fatal drawback and seriously hinders its practical applications. Herein, an alloy engineering strategy at the transition metal-sites of Ti2C MXene is proposed. Theoretical calculations reveal that the electronic redistribution of the solid-solution TiNbC MXene improves the electronic conductivity, induces the upward d-band center, tailors the surface functional groups, and increases the electron loss impedance, resulting in its excellent capacitive performance and high chemical stability. The as-prepared flexible TiNbC film delivers specific capacitance up to 381 F g(-1) at a scan rate of 2 mV s(-1) and excellent electrochemical stability without capacitance loss after 10000 charge/discharging cycles. This work provides a universal approach to develop high-performance and chemically stable MXene electrodes. | Notes: | Cong, Y (corresponding author), Wuhan Univ Sci & Technol, Sch Chem & Chem Engn, Hubei Prov Key Lab Coal Convers & New Carbon Mat, Wuhan 430081, Peoples R China. congye@wust.edu.cn; nianjun.yang@uhasselt.be |
Keywords: | alloy engineering strategy;density functional theory (DFT) calculations;stability;supercapacitors;Ti2C MXene | Document URI: | http://hdl.handle.net/1942/40140 | ISSN: | 1613-6810 | e-ISSN: | 1613-6829 | DOI: | 10.1002/smll.202301276 | ISI #: | 000974751700001 | Rights: | 2023 Wiley-VCH GmbH | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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Regulating d‐Band Center of Ti2C MXene Via Nb Alloying for Stable and High‐Efficient Supercapacitive Performances.pdf Restricted Access | Published version | 7.91 MB | Adobe PDF | View/Open Request a copy |
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