电化学
电容
阴极
超级电容器
电容器
材料科学
水溶液
储能
碳纤维
锌
活性炭
化学工程
化学
无机化学
纳米技术
电极
电压
复合材料
有机化学
电气工程
冶金
功率(物理)
吸附
物理化学
工程类
物理
复合数
量子力学
作者
Jinpeng Wu,Rurong Liu,Min Li,Xianyou Luo,Wende Lai,Xinren Zhang,De Li,Feng Yu,Yong Chen
标识
DOI:10.1016/j.est.2022.103996
摘要
Aqueous zinc-ion capacitors (ZIC) are promising energy storage devices due to their high specific capacitance, wide voltage window, and good safety. It is well known that the oxygen functional groups on carbon surface have a significant role for the capacitance performance in ZIC, however, as for the various oxygen functional groups, it is not clear which functional group plays an important role and what is the energy storage mechanism for ZIC. Herein, activated carbon (AC) was treated by a gradient acid to induce surface oxygen functional groups, mainly hydroxyl groups, as cathode materials in ZIC, which lead to capacitance increase by 33.3% from 120 to 160 F•g−1. Further experimental results and DFT calculation demonstrated that the secondary alcohols hydroxyl groups play a very important role in storage Zn2+, showing better electrochemical reversibility than tertiary alcohols. The modified AC cathodes also work well at different bending angles, manifesting huge potential for use in flexible and smart wearable portable electronic products. Overall, this improvement strategy for the capacity of AC cathode is of great significance and guidance value for the large-scale development of ZIC.
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