插层(化学)
超级电容器
储能
钒
材料科学
水溶液
氧化钒
化学工程
电容
无机化学
氧化物
化学
电极
物理化学
功率(物理)
物理
量子力学
工程类
冶金
作者
Xingyu Chen,Ziying Feng,Xueliang Dong,Hanmei Jiang,Changgong Meng,Yifu Zhang
出处
期刊:SusMat
[Wiley]
日期:2023-03-30
卷期号:3 (2): 263-275
被引量:5
摘要
Abstract Aqueous ammonium‐ion (NH 4 + ) hybrid supercapacitor (AA‐HSC), as a new type of energy storage device with great potential, is in the initial stage of rapid development. Based on its special energy storage mechanism, exploiting novel NH 4 + ‐hosting materials is still a great challenge. Herein, vanadium oxide hydration (VOH) tuned by interlayer engineering of K + /PANI co‐intercalation, named KVO/PANI, is designed for AA‐HSC. Intercalated PANI can shield interaction between NH 4 + and V–O layers to some extent and enlarge interlayer space, which improves the efficiency of reversible NH 4 + (de)insertion. However, K + enhances redox activity and electronic conductivity. The synergistic effect of co‐intercalation optimizes intercalation pseudocapacitive behavior during the (de)ammonization process, which is reported in NH 4 + storage for the first time. Theoretical calculations reveal that the lowered electron transport barrier and enhanced electronic conductivity improve NH 4 + kinetics and exhibit high capacitance for charge storage. The KVO/PANI can deliver the specific capacitance of 340 F g −1 at 0.5 A g −1 and retain 177 F g −1 at 10 A g −1 . Pairing with activated carbon, the AA‐HSC can achieve a decent energy density of 31.8 Wh kg −1 . This work gives inorganic/organic co‐intercalation that can enhance the NH 4 + storage of VOH by interlayer engineering. The strategy can be used to design other materials for aqueous energy storage systems.
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