材料科学
纳米孔
石英晶体微天平
纳米孔
电容
拉曼光谱
电极
超级电容器
石墨烯
密度泛函理论
电化学
纳米技术
电容感应
光电子学
钻石
化学物理
吸附
光学
化学
物理化学
物理
计算化学
计算机科学
复合材料
操作系统
作者
Bin Chen,Zhaofeng Zhai,Nan Huang,Chuyan Zhang,Siyu Yu,Lusheng Liu,Yang Bing,Xin Jiang,Nianjun Yang
标识
DOI:10.1002/aenm.202300716
摘要
Abstract A confined electrical double‐layer (EDL) inside nanoporous electrodes has a large capacitance and deviates from traditional ones. Unfortunately, its capacitive mechanism is still unclear. Herein, expanded vertical graphene/diamond (EVG/D) films with regular and ordered 0.7‐nm layered channels are designed and synthesized to serve as an ideal model for understanding confined EDL. A clear overall picture of confined EDL is provided at an atomic resolution with the aid of in situ electrochemical Raman spectroscopy, electrochemical quartz crystal microbalance (EQCM), and density functional theory (DFT) calculations combined with three‐dimension reference interaction site method (3D‐RISM). It is especially interesting that the induced charges in electrode hosts are highly localized with a density far higher than that on a traditional EDL and even close to those of ion batteries. It is proposed that such a high localization of induced charges plays an essential role in the high energy storage efficiency of confined EDL capacitance. This work not only provides a previously unexplored way to refine the mechanism of confined EDL, but also further lays the foundation for understanding the functions of nanoporous or layered materials in electrochemical energy storage.
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