超级电容器
电化学
接口(物质)
材料科学
光电子学
纳米技术
化学
电极
复合材料
物理化学
毛细管数
毛细管作用
作者
Gaini Zhang,Xinyue Wu,Yi Xu,Yanyan Cao,Yangyang Luo,Huijuan Yang,Jingjing Wang,Wenbin Li,Xifei Li
标识
DOI:10.1016/j.est.2024.110426
摘要
The inferior charge transfer kinetics and self-agglomerate issues have challenged the commercialization of nickel‑cobalt layered double hydroxides (NiCo-LDHs) in supercapacitors. In this study, we designed and constructed a hierarchical core-shell structure with CuO/NiCo-LDHs as electrode material on a highly conductive Cu foam substrate. To further boost its energy storage performance, electrochemical activation method was adopted to modify the electronic structure of CuO/NiCo-LDHs. Remarkably, this process led to a noticeable change in the interface structure between CuO and NiCo-LDHs, resulting in hierarchical double-shelled heterostructures. This unique structure concurrently promotes rapid electron conduction and ion diffusion within a high areal-loading electrode. The obtained EA(CuO/NiCo-LDH) electrode exhibited significantly enhanced areal-capacitance (7791 mF cm−2 at 10 mA cm−2, 762C g−1 at 2.17 A g−1) and rate capability (64.1 % capacitance retention at 60 mA cm−2). Furthermore, the hybrid supercapacitor (HSC) constructed with the EA(CuO/LDH30) and porous activated carbon (PAC) electrodes achieved a maximum energy density of 393.69 mW h cm−2 at power density of 3.70 mW cm−2 (39.2 Wh kg−1 at 368.3 W kg−1). This work paves the way for the modification of electronic and interface structure of electrode materials using an electrochemical activation strategy, and also expected to make great contributions to the application of LDHs in energy storage, catalyst and other fields.
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