The direct use of the original metal-organic framework (MOF) as an electrode material can reduce energy consumption and save costs during the commercialization of MOF-based energy storage materials. In this work, three kinds of ammonium solutions with different anions are introduced in the synthesis process and three forms of Co-based MOFs with different appearances are obtained: Co-BTC block, where BTC is trimesic acid; Co-BTC block microspheres; and Co-BTC nanoblock microspheres (CTNBMs). The CTNBMs have the highest specific capacitance among the three, which reveals that the nanonization of MOFs can effectively improve their energy storage performance. The CTNBMs exhibit a specific capacitance of 427.8 F g⁻¹ at 0.5 A g⁻¹ with a capacitance retention of 73.5% at 10 A g⁻¹. The energy storage mechanism shows that CTNBMs are affected mainly by diffusion control during the electrochemical process. Cyclic stability measurements demonstrate that the capacitance retention of CTNBMs after 3000 cycles at 8 A g⁻¹ is 85.9%, which is the best of the three as-prepared materials. In addition, the assembled CTNBM//activated carbon asymmetric supercapacitor device has a maximum energy density of 30.6 W h kg⁻¹ at a power density of 349.7 W kg⁻¹.

在基于MOF的储能材料商业化过程中，直接使用原始金属有机骨架（MOF）作为电极材料可以降低能耗，节约成本。在这项工作中，在合成过程中引入了三种不同阴离子的铵溶液，得到了三种形式不同外观的 Co 基 MOF：Co-BTC 嵌段，其中 BTC 为均苯三甲酸；Co-BTC 块状微球；和 Co-BTC 纳米块微球 (CTNBMs)。CTNBMs在三者中具有最高的比电容，这表明MOFs的纳米化可以有效提高其储能性能。CTNBM在 0.5 A g ^-1时表现出 427.8 F g ^-1的比电容，在 10 A g ^-1时的电容保持率为 73.5%^-1。储能机制表明，CTNBMs主要受电化学过程中扩散控制的影响。循环稳定性测量表明，CTNBMs 在 8 A g ^{-1 下}循环 3000 次后的电容保持率为85.9%，这是三种制备材料中最好的。此外，组装的CTNBM //活性炭不对称超级电容器装置具有30.6 W时公斤的最大能量密度^-1在349.7千克w ^的功率密度^-1。