材料科学
超级电容器
储能
化学工程
离子
重量分析
碳纤维
纳米结构
碳化
扩散
纳米技术
锌
电化学
介孔材料
电解质
复合材料
扫描电子显微镜
有机化学
电极
复合数
冶金
物理化学
催化作用
功率(物理)
工程类
物理
化学
热力学
量子力学
作者
Wen‐Bin Jian,Wenli Zhang,Xueer Wei,Bingchi Wu,Wei Liang,Ying Wu,Jian Yin,Ke Lu,Yanan Chen,Husam N. Alshareef,Xueqing Qiu
标识
DOI:10.1002/adfm.202209914
摘要
Abstract Zinc ion hybrid supercapacitors (ZIHCs) with both high power density and high energy density have tremendous potential for energy storage applications such as hybrid electric vehicles and renewable energy storage. However, the large radius of hydrated Zn 2+ ions hampers their efficient storage in micropores with limited pore sizes, resulting in the limited gravimetric specific capacitance and inferior rate capability of ZIHCs. Therefore, it is critically important to understand to what extent pore size influences the storage of hydrated Zn 2+ ions in the pores with limited sizes. Herein, porous carbon nanosheets with different pore architectures are prepared using an ammonium chloride molten salt carbonization strategy. The influence of pore size on hydrated Zn 2+ ion storage in nanostructured carbon with divergent pore architectures is analyzed by electrochemical methods and molecular dynamic simulation. Micropores smaller than 6.0 Å obstruct the diffusion of hydrated Zn 2+ ions, while micropores larger than 7.5 Å exhibit a low diffusion energy barrier for the hydrated Zn 2+ ions. Mesopores improve capacitance and rate capability by exposing the electrochemically active sites and enhancing the diffusion of the hydrated Zn 2+ ions.
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