Deng Lingjuan, Liu Jiahuan, Ma Zhanying, Fan Guang, Liu Zong-Huai
College of Chemistry and Chemical Engineering, Xianyang Normal University Xianyang Shaanxi 712000 P. R. China
Key Laboratory of Applied Surface and Colloid Chemistry, Shaanxi Normal University, Ministry of Education Xi'an 710062 P. R. China.
RSC Adv. 2018 Jul 10;8(44):24796-24804. doi: 10.1039/c8ra04200d. eCollection 2018 Jul 9.
Preparation of new types of electrode material is of great importance to supercapacitors. Herein, a graphene/bismuth vanadate (GR/BiVO) free-standing monolith composite has been prepared a hydrothermal process. Flexible GR sheets act as a skeleton in the GR/BiVO monolith composites. When used as a binder-free electrode in a three-electrode system, the GR/BiVO composite electrode can provide an impressive specific capacitance of 479 F g in a potential window of -1.1 to 0.7 V SCE at a current density of 5 A g. A symmetrical supercapacitor cell which can be reversibly charged-discharged at a cell voltage of 1.6 V has been assembled based on this GR/BiVO monolith composite. The symmetrical capacitor can deliver an energy density of 45.69 W h kg at a power density of 800 W kg. Moreover, it ensures rapid energy delivery of 10.75 W h kg with a power density of 40 kW kg.
新型电极材料的制备对超级电容器至关重要。在此，通过水热法制备了一种石墨烯/钒酸铋（GR/BiVO）独立式整体复合材料。柔性GR片在GR/BiVO整体复合材料中充当骨架。当在三电极系统中用作无粘结剂电极时，GR/BiVO复合电极在-1.1至0.7 V（相对于饱和甘汞电极）的电位窗口中，在5 A g的电流密度下可提供令人印象深刻的479 F g比电容。基于这种GR/BiVO整体复合材料组装了一个可在1.6 V电池电压下可逆充放电的对称超级电容器电池。该对称电容器在800 W kg的功率密度下可提供45.69 W h kg的能量密度。此外，它在40 kW kg的功率密度下确保了10.75 W h kg的快速能量输出。
