Bimetallic (Ti1−xVx)3C2Tx MXene as electrodes for antifreezing flexible all-solid-state micro-supercapacitors with fast ion diffusion and charge transfer
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引用次数: 0
Abstract
Two-dimensional (2D) MXene Ti3C2Tx has been widely investigated as pseudocapacitive electrode materials for supercapacitors, yet their charge storage capability is often hindered by the influences of ion diffusion and charge transfer rates. Therefore, how to explore excellent electrode materials with great specific capacitance, high rate performance and long cycle life has always been a challenge. Herein, high electrochemical activity vanadium atoms are introduced into Ti3AlC2 to construct bimetallic (Ti1−xVx)3C2Tx MXene, and the influence of vanadium doping concentration on the electrochemical performance of microsupercapacitors (MSCs) is systematically researched. Firstly, it was demonstrated by exploring the sample preparation that the strategy of using Ti3C2Tx MXene as a template to prepare V3C2Tx cannot be achieved. Moreover, the appropriate doping amount of vanadium atoms can significantly improve the charge transfer and enable rapid ion diffusion in the electrode. Therefore, the bimetallic (Ti1−xVx)3C2Tx MXene constructed by the vanadium doping strategy can increase its charge storage capacity by 30%, and possesses excellent long-term cycling stability (85.93% capacity retention after 20,000 cycles). With the assistance of the modified gel-electrolyte, V-doped MXene-based MSCs still retain 74.15% of the capacitance at −35 °C, indicating that the device has brilliant anti-freezing performance. The corresponding density functional theory (DFT) calculations further elucidate the mechanism of V atom doping to improve charge storage capacity through structural stability and H ion adsorption energy. This work demonstrates the enormous potential of micro-scale flexible supercapacitors through the modification of MXene-based electrode materials and electrolytes, providing new insights for the design of high-performance micro-scale flexible power sources that can operate in complex environments.
期刊介绍:
Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem.
Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.