Novel benzene-1,3,5-tricarboxylic acid-cobalt phosphate metal–organic framework (MOFCoP@rGOx, x = 1, 2, 3, 4) hybrid electrodes are synthesized via microwave route. The as-obtained MOFCoP@rGOx composites have been subjected to physico-chemical (XRD, Raman, SEM, and BET) and electrochemical (CV, GCD, and EIS) studies. Amongst, 50 mg reduced graphene oxide (rGO)-dispersed MOFCoP@rGO2 exhibits 3D architecture in SEM and synergistically improvises faradaic and non-faradaic reactions which enhanced specific capacitances and cyclability. The XRD reveals the monoclinic crystalline geometry. The I_D/I_G ratio of Raman analysis reveals carbon coordination, and the BET analysis shows enhanced specific surface area and increase in pore voids which are accommodating more number of ions for improved electrochemical performance. XPS studies identify inherent oxidation states and chemical constituents of MOFCoP@rGO2. The CV studies on all composites are compared @ 5 mV s⁻¹, and the GCD @ 1 A g⁻¹ shows higher specific capacitance only for 50 mg doped MOFCoP exhibiting EDLC and pseudocapacitance, and the same electrode in device performance with rGO registers 133 F g⁻¹ @ 1 A g⁻¹. The equivalent series resistance is lower (0.09 Ω cm⁻²) for MOFCoP@rGO2 which results increase in conductivity and comprehends this composite for hybrid supercapacitor applications.

Graphical abstract

中文翻译：

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用于混合超级电容器的磷酸钴-苯-1,3,5-三羧酸金属有机框架@还原氧化石墨烯电极

通过微波途径合成了新型苯-1,3,5-三羧酸-磷酸钴金属有机骨架(MOFCoP@rGOx, x  = 1,2,3,4)混合电极。所获得的 MOFCoP@rGOx 复合材料已进行物理化学（XRD、拉曼、SEM 和 BET）和电化学（CV、GCD 和 EIS）研究。其中，50 mg 还原氧化石墨烯 (rGO) 分散的 MOFCoP@rGO2 在 SEM 中呈现出 3D 结构，并协同即兴发生法拉第和非法拉第反应，从而增强了比电容和循环性能。XRD揭示了单斜晶体几何形状。拉曼分析的I _D / I _G比揭示了碳配位，BET 分析显示比表面积增加和孔隙增加，可容纳更多数量的离子，从而改善电化学性能。XPS 研究确定了 MOFCoP@rGO2 的固有氧化态和化学成分。对所有复合材料的 CV 研究在 5 mV s ⁻¹下进行比较，并且 GCD @ 1 A g ⁻¹仅对 50 mg 掺杂的 MOFCoP 显示出更高的比电容，表现出 EDLC 和赝电容，并且使用 rGO 寄存器的器件性能相同的电极 133 F g ^-1 @ 1 A g ^-1。MOFCoP@rGO2 的等效串联电阻较低（0.09 Ω cm ^-2），这导致电导率增加，并适合混合超级电容器应用。

图形概要