Liu Kang-Kai, Guan Zong-Jie, Ke Mengting, Fang Yu
State Key Laboratory for Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, People's Republic of China.
Innovation Institute of Industrial Design and Machine Intelligence Quanzhou-Hunan University, Quanzhou, Fujian 362801, People's Republic of China.
ACS Cent Sci. 2023 Apr 5;9(4):805-815. doi: 10.1021/acscentsci.3c00027. eCollection 2023 Apr 26.
Porous materials have been widely applied for supercapacitors; however, the relationship between the electrochemical behaviors and the spatial structures has rarely been discussed before. Herein, we report a series of porous coordination cage (PCC) flexible supercapacitors with tunable three-dimensional (3D) cavities and redox centers. PCCs exhibit excellent capacitor performances with a superior molecular capacitance of 2510 F mmol, high areal capacitances of 250 mF cm, and unique cycle stability. The electrochemical behavior of PCCs is dictated by the size, type, and open-close state of the cavities. Both the charge binding site and the charge transportation pathway are unambiguously elucidated for PCC supercapacitors. These findings provide central theoretical support for the "structure-property relationship" for designing powerful electrode materials for flexible energy storage devices.
多孔材料已被广泛应用于超级电容器；然而，此前很少有人讨论过其电化学行为与空间结构之间的关系。在此，我们报道了一系列具有可调三维（3D）空腔和氧化还原中心的多孔配位笼（PCC）柔性超级电容器。PCC表现出优异的电容性能，具有2510 F mmol的卓越分子电容、250 mF cm的高面积电容以及独特的循环稳定性。PCC的电化学行为由空腔的大小、类型和开闭状态决定。对于PCC超级电容器，电荷结合位点和电荷传输途径都得到了明确的阐释。这些发现为设计用于柔性储能装置的高性能电极材料的“结构-性能关系”提供了核心理论支持。
