Enhanced proton pseudocapacitive of Ti3C2Tx in neutral electrolyte activated by acid regulation dynamic pillars

Rang Ping, Yulin Nie, Chongkai Ji, Zhigang Hao, Shun Yang, Lijie Li, Jiong Peng*, Xin Li

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

3 引用 (Scopus)

摘要

Aqueous Zinc ion capacitors (ZICs) using 2D transition metal carbides or nitrides (MXenes) have extraordinary energy density and wide potential range. However, low pseudocapacitance and slowly divalent charges (e.g., zinc ions) transfer in MXene nano sheets are the essential issues in exploring MXene-based ZICs of greater energy densities. Herein, the strategy of using Al3+ as dynamic acid regulation pillars is demonstrated to address these issues. Attributing to dynamically expanded layer spacing, adjustable acid of electrolyte and excited proton pseudocapacitance, enhanced capacity values of 277.9 F g-1 with a high voltage range from -1 to 0.3 V is achieved. The energy density of asymmetric ZICs constructed applied this strategy exhibits superior energy densities of 37.7 Wh kg-1 with outstanding cycling stability, which has been greatly improved compared with traditional acidic and neutral electrolytes. DFT calculations reveal the enhancement mechanism of acid regulation dynamic pillars on electrochemical performance. Our study provides a pathway for precise control of Ion selectivity in MXene energy storage process, and could be further used for other electrolyte systems and aqueous Zn-ion electrodes as well.

源语言英语
文章编号140650
期刊Chemical Engineering Journal
455
DOI
出版状态已出版 - 1 1月 2023

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Ping, R., Nie, Y., Ji, C., Hao, Z., Yang, S., Li, L., Peng, J., & Li, X. (2023). Enhanced proton pseudocapacitive of Ti3C2Tx in neutral electrolyte activated by acid regulation dynamic pillars. Chemical Engineering Journal, 455, 文章 140650. https://doi.org/10.1016/j.cej.2022.140650