Lin Jinghuang, Jia Henan, Liang Haoyan, Chen Shulin, Cai Yifei, Qi Junlei, Qu Chaoqun, Cao Jian, Fei Weidong, Feng Jicai
State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China.
Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal University Siping 136000 China.
Adv Sci (Weinh). 2017 Dec 27;5(3):1700687. doi: 10.1002/advs.201700687. eCollection 2018 Mar.
NiO is a promising electrode material for supercapacitors. Herein, the novel vertically standing nanosized NiO encapsulated in graphene layers (G@NiO) are rationally designed and synthesized as nanosheet arrays. This unique vertical standing structure of G@NiO nanosheet arrays can enlarge the accessible surface area with electrolytes, and has the benefits of short ion diffusion path and good charge transport. Further, an interconnected graphene conductive network acts as binder to encapsulate the nanosized NiO particles as core-shell structure, which can promote the charge transport and maintain the structural stability. Consequently, the optimized G@NiO hybrid electrodes exhibit a remarkably enhanced specific capacity up to 1073 C g and excellent cycling stability. This study provides a facial strategy to design and construct high-performance metal oxides for energy storage.
氧化镍是一种很有前景的超级电容器电极材料。在此，将新型垂直排列的、包裹在石墨烯层中的纳米级氧化镍（G@NiO）合理设计并合成为纳米片阵列。G@NiO纳米片阵列这种独特的垂直排列结构能够扩大与电解质接触的表面积，具有离子扩散路径短和电荷传输良好的优点。此外，相互连接的石墨烯导电网络作为粘结剂，将纳米级氧化镍颗粒包裹成核壳结构，这可以促进电荷传输并保持结构稳定性。因此，优化后的G@NiO混合电极展现出显著增强的比容量，高达1073 C/g，以及优异的循环稳定性。本研究为设计和构建用于能量存储的高性能金属氧化物提供了一种简便策略。
