Engineering active sites on hierarchical ZnNi layered double hydroxide architectures with rich Zn vacancies boosting battery-type supercapacitor performances.
- 影响因子：6.901
- DOI码：10.1016/j.electacta.2021.137932
- 发表刊物：Electrochim. Acta
- 关键字：Hierarchical architectures, Zn vacancies, Electron conductivity, Active sites, Supercapacitor
- 摘要：Designing metal-cation defects with desired architectures is a big challenge for boosting electrochemical performances. Herein, we report ultrathin ZnNi layered double hydroxide (LDH) nanosheets with rich Zn vacancies (V-Zn) uniformly anchored on CuO nanowire skeletons for high performance capacitive electrode via a zeolitic imidazolate frameworks-8 derived approach. The optimized V-Zn-defect electrode displays high area capacity of 3967 mF cm(-2) at a current density of 2.0 mA cm(-2). Moreover, an all solid-state hybrid supercapacitor constructed with the V-Zn-defect sample and activated carbon delivers a maximum energy density of 1.03 mWh cm(-3) at a power density of 9.3 mW cm(-3). Mechanism studies indicate that V-Zn regulates the electronic structure of ZnNi LDH nanosheets for electron conductivity and surface Faradaic reactions. The work may disclose the role of metal-cation defects in affecting the electrochemical activity at atomic level for developing high performance supercapacitors.
- 合写作者：Jiawei Xue, Lan Yang
- 第一作者：Haoyang Wu, Xiaoqing Zhang
- 通讯作者：Hui Zhang, Shikuo Li
- 文献类型：SCI
- 卷号：374
- 页面范围：137932
- 是否译文：否
- 发表时间：2021/02/10
- 发布期刊链接：https://www.sciencedirect.com/science/article/pii/S001346862100222X
