Cheng Tsai-Mu, Lu Yi-An, Lee Pin-Chun, Kongvarhodom Chutima, Husain Sadang, Yougbaré Sibidou, Chen Hung-Ming, Lin Lu-Yin
Graduate Institute for Translational Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei 11031, Taiwan.
Taipei Heart Institute, Taipei Medical University, Taipei 11031, Taiwan.
ACS Omega. 2025 Aug 22;10(35):40089-40100. doi: 10.1021/acsomega.5c04906. eCollection 2025 Sep 9.
Cobalt-based compounds have attracted considerable attention as electroactive materials for energy storage owing to their high theoretical capacitance and cost-effectiveness. Zeolitic imidazolate framework-67 (ZIF67) is a cobalt-containing metal-organic framework that features a high surface area and a tunable porous architecture, but inherently low conductivity limits its electrochemical performance. To address this issue, structure-directing agents (SDAs) have been employed to enhance the surface characteristics and energy storage behavior of ZIF67 derivatives. In particular, the redox activity of battery-type electrodes is largely governed by the nature of the metal species involved. In this study, a series of cobalt-based bimetallic compounds incorporating Ni, Cu, Al, Zn, and Mn are synthesized using NHF as the SDA in 2-methylimidazole medium. Morphology and composition of the resulting materials are strongly dependent on the secondary metal species. The cobalt-nickel (CoNi) electrode achieves the highest specific capacitance ( ) of 997.3 F/g at 20 mV/s, attributed to the synergistic redox behavior of cobalt and nickel. The contributions from both diffusion-controlled and surface-capacitive processes are also quantitatively assessed. A BSH assembled using the CoNi and carbon electrodes achieves a maximum energy density of 9.2 Wh/kg at 375 W/kg, along with a retention of 83.1% and a Coulombic efficiency of 94.2% after 10,000 cycles.
钴基化合物因其高理论电容和成本效益,作为储能的电活性材料受到了广泛关注。沸石咪唑酯骨架-67(ZIF67)是一种含钴的金属有机骨架材料,具有高比表面积和可调节的多孔结构,但固有低电导率限制了其电化学性能。为了解决这个问题,已采用结构导向剂(SDA)来增强ZIF67衍生物的表面特性和储能行为。特别是,电池型电极的氧化还原活性在很大程度上取决于所涉及的金属物种的性质。在本研究中,在2-甲基咪唑介质中以NHF作为SDA合成了一系列包含Ni、Cu、Al、Zn和Mn的钴基双金属化合物。所得材料的形貌和组成强烈依赖于第二金属物种。钴镍(CoNi)电极在20 mV/s时实现了997. 3 F/g的最高比电容( ),这归因于钴和镍的协同氧化还原行为。还定量评估了扩散控制过程和表面电容过程的贡献。使用CoNi和碳电极组装的BSH在375 W/kg时实现了9.2 Wh/kg的最大能量密度,在10000次循环后 保持率为83.1%,库仑效率为94.2%。