Han Yuhao, Liu Zijie, Wang Chao, Guo Li, Wang Yanzhong
School of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China; Institute of Advanced Energy Materials and System, North University of China, Taiyuan 030051, PR China.
Institute of Advanced Energy Materials and System, North University of China, Taiyuan 030051, PR China.
J Colloid Interface Sci. 2024 May;661:139-149. doi: 10.1016/j.jcis.2024.01.152. Epub 2024 Jan 24.
Metal-organic frameworks (MOFs) have attracted considerable attention in the field of energy storage and conversion due to their large specific surface area, regulatable pore structure and composition. However, the poor electrical conductivity and few active sites of MOFs impede their application. Herein, highly conductive MXene nanosheets are introduced to modulate the electronic conductivity and structure of rod-like Co-pyridinedicarboxylic acid (Co-PDC), and thus enhancing the electrochemical performance of MOFs. The heterostructural Co-PDC/MXene (CPM) was facily synthesized at room temperature. The as-prepared CPM-30 with 30 % MXene only requires the overpotential of 75.1 mV to achieve a current density of 10 mA cm for hydrogen evolution reaction (HER), and the assembled electrolytic cell with CPM-30 and RuO as cathode and anode electrodes can achieve a current density of 10 mA cm at a voltage of 1.65 V. In addition, CPM-10 exhibits a high specific capacitance of 583.1 F g at 0.5 A g and an excellent rate performance of 41.6 % at 50 A g. Furthermore, the assembled asymmetric supercapacitor CPM-10//AC exhibited an energy density of 15.55 Wh kg at a power density of 750 W kg and excellent stability with a capacitance retention rate of 95 % after 10,000 cycles. The excellent electrochemical properties of Co-PDC/MXene are attributed to the unique structure and synergistic effect of Co-PDC and MXene.
金属有机框架材料（MOFs）因其大比表面积、可调控的孔结构和组成，在能量存储与转换领域受到了广泛关注。然而，MOFs的低电导率和较少的活性位点阻碍了它们的应用。在此，引入高导电性的MXene纳米片来调节棒状钴吡啶二甲酸（Co-PDC）的电子导电性和结构，从而提高MOFs的电化学性能。异质结构的Co-PDC/MXene（CPM）在室温下易于合成。所制备的含30%MXene的CPM-30在析氢反应（HER）中仅需75.1 mV的过电位即可达到10 mA cm的电流密度，以CPM-30为阴极、RuO为阳极组装的电解池在1.65 V电压下可实现10 mA cm的电流密度。此外，CPM-10在0.5 A g时表现出583.1 F g的高比电容，在50 A g时具有41.6%的优异倍率性能。此外，组装的不对称超级电容器CPM-10//AC在功率密度为750 W kg时能量密度为15.55 Wh kg，并且具有出色的稳定性，在10000次循环后电容保持率为95%。Co-PDC/MXene优异的电化学性能归因于Co-PDC和MXene的独特结构和协同效应。
