Nguyen Van Thanh, Sari Fitri Nur Indah, Ting Jyh-Ming
Department of Materials Science and Engineering, National Cheng Kung University Tainan 70101 Taiwan
Hierarchical Green-Energy Materials (Hi-GEM) Research Center, National Cheng Kung University Tainan 70101 Taiwan.
RSC Adv. 2022 Oct 12;12(45):29170-29176. doi: 10.1039/d2ra05679h. eCollection 2022 Oct 11.
Room-temperature synthesized 3D hierarchical cobalt vanadate (CoVO) nanosheet arrays on Ni foam for use as supercapacitor electrode is presented. In a 3 M KOH electrolyte, the electrode exhibits a capacitance of 109.9 mA h g (878.9 F g) at a current density of 1 A g. The capacitance is enhanced to 198.1 mA h g (1584.5 F g) at 1 A g through the addition of 0.05 M redox-additive K[Fe(CN)] into the KOH electrolyte. Furthermore, the CoVO/activated carbon asymmetric supercapacitor cell with the advanced electrolyte outperforms most reported CoVO-based electrodes with a remarkable energy density of 55.5 W h kg at an 800 W kg power density. Combining a facile synthetic strategy and excellent electrochemical performance, the obtained CoVO exhibits potential for practical application.
本文介绍了在泡沫镍上室温合成的三维分层钒酸钴（CoVO）纳米片阵列用作超级电容器电极的情况。在3M KOH电解液中，该电极在1 A g的电流密度下表现出109.9 mA h g（878.9 F g）的电容。通过向KOH电解液中添加0.05 M氧化还原添加剂K[Fe(CN)]，在1 A g时电容提高到198.1 mA h g（1584.5 F g）。此外，具有先进电解液的CoVO/活性炭不对称超级电容器电池在800 W kg的功率密度下具有55.5 W h kg的显著能量密度，优于大多数报道的基于CoVO的电极。结合简便的合成策略和优异的电化学性能，所制备的CoVO具有实际应用潜力。
