Deng Ting, Shi Xiaoyuan, Zhang Wei, Wang Zizhun, Zheng Weitao
Key Laboratory of Mobile Materials Ministry of Education, School of Materials Science and Engineering, Electron Microscopy Center, and International Center of Future Science, Jilin University, Changchun 130012, People's Republic of China.
Key Laboratory of Polyoxometalate Science of Ministry of Education, Northeast Normal University, Changchun 130024, People's Republic of China.
Nanotechnology. 2021 Feb 12;32(7):075402. doi: 10.1088/1361-6528/abb975.
Metal organic frameworks (MOFs) with numerous potential pseudocapacitive sites are quite appealing to supercapacitors with high specific and areal capacitances. However, MOFs suffer from a low conductivity nature, resulting in a mediocre electrochemical performance. Herein, we propose a template-growth strategy of MOF to enhance both specific and areal capacitances of MOF as the electrode material for supercapacitor. As the loading mass of MOF increases from 2 to 5 mg, the specific capacitance also increases from 937 to 2387 Fg (431 to 1098 Cg) and areal capacitance 1.87 to 11.94 Fcm (0.86 to 5.49 Ccm). Accordingly, a hybrid MOF//AC supercapacitor can deliver a maximum energy density of 67 Wh kg and a maximum power density of 6000 W kg. These results point to a way to fabricate MOF electrode of supercapacitor with high specific and areal capacitance, which leads them to a more practical future.
具有众多潜在赝电容位点的金属有机框架（MOF）对具有高比电容和面积电容的超级电容器颇具吸引力。然而，MOF具有低电导率的特性，导致其电化学性能一般。在此，我们提出一种MOF的模板生长策略，以提高作为超级电容器电极材料的MOF的比电容和面积电容。随着MOF负载质量从2毫克增加到5毫克，比电容也从937 F/g（431 C/g）增加到2387 F/g（1098 C/g），面积电容从1.87 F/cm²（0.86 C/cm²）增加到11.94 F/cm²（5.49 C/cm²）。相应地，一种混合MOF//AC超级电容器可提供67 Wh/kg的最大能量密度和6000 W/kg的最大功率密度。这些结果指出了一种制造具有高比电容和面积电容的超级电容器MOF电极的方法，这使其拥有更具实用性的未来。
