Ahsan Muhammad Tayyab, Usman Muhammad, Ali Zeeshan, Javed Sofia, Ali Rashad, Farooq Muhammad U, Akram Muhammad Aftab, Mahmood Asif
School of Chemical & Materials Engineering, National University of Sciences and Technology (NUST), Islamabad, Pakistan.
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, China.
Front Chem. 2020 Jun 15;8:487. doi: 10.3389/fchem.2020.00487. eCollection 2020.
Increased efforts have been devoted recently to develop high-energy-density supercapacitors (SC) without renouncing their power efficiency. Herein, a hierarchically mesoporous nanostructure of zinc-nickel-cobalt oxide (ZNCO) nanowires (NWs) is constructed by hierarchical aggregation of ZNCO nanoparticles. It is worth noting that cobalt and nickel rich lattice imparts higher charge storage capability by enhanced reversible Faradaic reaction while zinc provides structural stability and higher conductivity. Moreover, particulate nature of ZNCO NWs allows deep diffusion of electrolyte thus enabling reversible charge storage under higher current densities. The as-prepared ZNCO NWs exhibited excellent specific capacitance of 2082.21 F g at the current density of 1 A g with high stability up to 5,000 charge-discharge cycles. Further, the asymmetric SC device was assembled using ZNCO NWs (ZNCO NWs//MWCNTs) which exhibited high energy density of 37.89 Wh kg and excellent capacitance retention up to 88.5% over 1,000 cycles. This work presents ways to construct multi-component high-energy-density materials for next-generation energy storage devices.
最近人们加大了努力，致力于开发高能密度超级电容器（SC），同时又不牺牲其功率效率。在此，通过氧化锌镍钴（ZNCO）纳米颗粒的分层聚集构建了一种具有分级介孔纳米结构的氧化锌镍钴纳米线（ZNCO NWs）。值得注意的是，富含钴和镍的晶格通过增强可逆法拉第反应赋予更高的电荷存储能力，而锌则提供结构稳定性和更高的导电性。此外，ZNCO NWs的颗粒性质允许电解质深度扩散，从而能够在更高电流密度下实现可逆电荷存储。所制备的ZNCO NWs在1 A g的电流密度下表现出2082.21 F g的优异比电容，在高达5000次充放电循环中具有高稳定性。此外，使用ZNCO NWs（ZNCO NWs//MWCNTs）组装了非对称SC器件，其表现出37.89 Wh kg的高能量密度，并且在1000次循环中具有高达88.5%的优异电容保持率。这项工作提出了构建用于下一代储能器件的多组分高能密度材料的方法。
