Xiao Ting, Tang Can, Lin Hongxiang, Li Xiuru, Mei Yuting, Xu Can, Gao Lin, Jiang Lihua, Xiang Peng, Ni Shibing, Xiao Yequan, Tan Xinyu
Hubei Provincial Engineering Research Center for Solar Energy High-value Utilization and Green Conversion, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering, China Three Gorges University, Yichang 443002, China.
Hubei Provincial Engineering Technology Research Center for Microgrid, College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China.
Inorg Chem. 2024 Sep 23;63(38):17714-17726. doi: 10.1021/acs.inorgchem.4c02554. Epub 2024 Sep 5.
Ion preintercalation is an effective method for fine-tuning the electrochemical characteristics of electrode materials, thereby enhancing the performance of aqueous ammonium-ion hybrid supercapacitors (A-HSCs). However, much of the current research on ion preintercalation lacks controllability, and the underlying mechanisms remain unclear. In this study, we employ a two-step electrochemical activation approach, involving galvanostatic charge-discharge and cyclic voltammetry, to modulate the preintercalation of NH in MnO. An in-depth analysis of the electrochemical activation mechanism is presented. This two-step electrochemical activation approach endows the final MnO/AC electrode with a high capacitance of 917.4 F g, approximately 2.4 times higher than that of original MnO. Furthermore, the MnO/AC electrode retains approximately 93.4% of its capacitance after 10 000 cycles at a current density of 25 mA cm. Additionally, aqueous A-HSC, comprising MnO/AC and P-MoO, achieves a maximum energy density of 87.6 Wh kg. This study offers novel insights into the controllable ion preintercalation approach via electrochemical activation.
离子预嵌入是一种微调电极材料电化学特性的有效方法，从而提高水系铵离子混合超级电容器（A-HSCs）的性能。然而，目前许多关于离子预嵌入的研究缺乏可控性，其潜在机制仍不清楚。在本研究中，我们采用两步电化学活化方法，包括恒电流充放电和循环伏安法，来调节MnO中NH的预嵌入。对电化学活化机制进行了深入分析。这种两步电化学活化方法赋予最终的MnO/AC电极917.4 F g的高电容，约为原始MnO电容的2.4倍。此外，MnO/AC电极在25 mA cm的电流密度下循环10000次后，仍保留约93.4%的电容。此外，由MnO/AC和P-MoO组成的水系A-HSC实现了87.6 Wh kg的最大能量密度。本研究为通过电化学活化实现可控离子预嵌入方法提供了新的见解。
