Wang Hong, Wu Shuai, Zhao Peihua, Wang Chao, Guo Li, Wang Yanzhong
School of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China; Shanxi Key Laboratory of Efficient Hydrogen Storage & Production Technology and Application, North University of China, Taiyuan 030051, PR China.
School of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China.
J Colloid Interface Sci. 2024 Dec;675:712-720. doi: 10.1016/j.jcis.2024.07.071. Epub 2024 Jul 9.
Rationally designing metal organic frameworks (MOFs) as an ideal dual-function material for water electrolysis and supercapacitors is of great significance for energy storage and conversion. Herein, we successfully synthesized the nanoneedle-like structure CoNi-MOF by partially replacing 2, 5-thiophenedicarboxylic acid (TDA) with 1, 1'-Ferrocenedicarboxylate (Fc). The exchange of Fc ligand can modulate the morphology and electronic structure of CoNi-TDA, thus exposing the abundant active sites and improving the electrical conductivity. The as-prepared CoNi-TDA/0.2Fc exhibited a low overpotential of 236 mV at 10 mA cm for oxygen evolution reaction (OER) and a low Tafel slope of 40.44 mV dec. Additionally, CoNi-TDA/0.2Fc demonstrated a notable specific capacitance of 1409 F g at 1 A/g and excellent stability, maintaining a capacitance retention of 96.54 % after 20,000 cycles. The study proposes a new strategy to modulate the morphology and electronic structure of MOFs via the ligand exchange for high-performance energy storage and conversion device.
合理设计金属有机框架材料（MOFs）作为用于水电解和超级电容器的理想双功能材料，对于能量存储和转换具有重要意义。在此，我们通过用1,1'-二茂铁二甲酸酯（Fc）部分取代2,5-噻吩二甲酸（TDA），成功合成了纳米针状结构的CoNi-MOF。Fc配体的交换可以调节CoNi-TDA的形貌和电子结构，从而暴露出丰富的活性位点并提高电导率。所制备的CoNi-TDA/0.2Fc在10 mA cm时析氧反应（OER）的过电位低至236 mV，塔菲尔斜率为40.44 mV dec。此外，CoNi-TDA/0.2Fc在1 A/g时表现出1409 F g的显著比电容和优异的稳定性，在20000次循环后电容保持率为96.54%。该研究提出了一种通过配体交换调节MOFs的形貌和电子结构以用于高性能能量存储和转换装置的新策略。
