One of the key challenges has been taken to design high performance hybrid energy storage devices using electrodes based on capacitive graphene nanoplatelets (GNPs) and pseudocapacitive metal organic frameworks (MOFs) with high energy storage, power density and long-life cycles. Herein, we are introducing novel hybrid capacitors based on highly porous composite electrodes of ZIF-67/GNPs and ZIF-8/GNPs and redox additive electrolyte (RAE) that is, 0.2 M [K₃(Fe (CN)₆)] in 1 M Na₂SO₄. The ZIF-67/GNPs and ZIF-8/GNPs composite electrodes were used to fabricate the asymmetric supercapacitor devices using MOFs/GNPs as a positive electrode and GNPs as the negative electrode in the presence of RAE exhibited high energy and power densities of 85.8 W h kg⁻¹ and 60.7 W h kg⁻¹ and 7500 W kg⁻¹ and 7370 W kg⁻¹, respectively at current density of 1 Ag⁻¹. The asymmetric devices retain excellent capacitances of up to 97.7% (ZIF-67/GNPs) and 97.1% (ZIF-8/GNPs) along with remarkable columbic efficiencies near 100% after 10,000 charge discharge cycles at 2 Ag⁻¹ in a wide voltage range of (0.0–1.5 V).

使用基于电容石墨烯纳米片 (GNP) 和赝电容金属有机框架 (MOF) 的电极设计高性能混合储能设备已成为关键挑战之一，具有高能量存储、功率密度和长寿命周期。在此，我们介绍了基于 ZIF-67/GNP 和 ZIF-8/GNP 的高多孔复合电极和氧化还原添加剂电解质 (RAE)，即 0.2 M [K ₃ (Fe (CN) ₆ )] 的新型混合电容器。 1 M Na ₂ SO ₄. ZIF-67/GNPs和ZIF-8/GNPs复合电极用于制造以MOFs/GNPs为正极，GNPs为负极在RAE存在下的非对称超级电容器装置，其能量和功率密度高达85.8 W h kg ^-1和 60.7 W h kg ^-1和 7500 W kg ^-1和 7370 W kg ^-1，在 1 Ag ^{-1 的}电流密度下。非对称器件在宽电压下以 2 Ag ^-1进行 10,000 次充电放电循环后保持高达 97.7% (ZIF-67/GNPs) 和 97.1% (ZIF-8/GNPs) 的优异电容以及接近 100% 的显着库伦效率(0.0–1.5 V) 的范围。