Qin Shumin, Liang Jianying, Luo Shuang, Feng Jinglv, Xu Pengfei, Liu Kang, Li Jien
State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, and School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China.
Department of Materials Science & Engineering, City University of Hong Kong, Hong Kong, China.
J Colloid Interface Sci. 2024 Nov;673:321-332. doi: 10.1016/j.jcis.2024.06.044. Epub 2024 Jun 7.
Binder-free self-supported carbon cloth electrode provides novel strategies for the preparation of MOFs, effectively improving the conductivity and promoting charge transfer. Combining MOFs with vanadate to form a unique heterogeneous structure provides a large specific surface area and more active sites, further enhancing the kinetics of MOFs. Herein, a self-supported carbon cloth electrode is prepared by in-situ growth of CoNi-MOFs on activated carbon cloth (AC) and coating with NiVO. The heterostructure increases the specific surface area and exposes more active sites to promote the adsorption and diffusion of ions, thus enhancing the kinetic activity and optimizing charge storage behavior. As expected, the NiVO@CoNi-MOF/AC exhibits a specific capacitance of up to 19.20 F/cm at 1 mA/cm. The asymmetric supercapacitors (ASCs) assembled by NiVO@CoNi-MOF/AC and annealed activated carbon cloth achieve an energy density of 1.27 mWh/cm at a power density of 4 mW/cm and have a capacitance retention of 96.43 % after 10,000 cycles. In addition, the NiVO@CoNi-MOF/AC as electrocatalyst has an overpotential of 370 mV at 10 mA/cm and a Tafel slope of 208 mV dec, demonstrating remarkable electrocatalytic oxygen evolution reaction performance. These unique heterostructures endow the electrode with more electrochemical selectivity and provide new key insights for designing multifunctional materials.
无粘结剂自支撑碳布电极提供了制备金属有机框架材料（MOFs）的新策略，有效提高了导电性并促进了电荷转移。将MOFs与钒酸盐结合形成独特的异质结构，提供了大的比表面积和更多的活性位点，进一步增强了MOFs的动力学性能。在此，通过在活性炭布（AC）上原位生长CoNi-MOFs并涂覆NiVO制备了一种自支撑碳布电极。这种异质结构增加了比表面积并暴露出更多活性位点，以促进离子的吸附和扩散，从而增强动力学活性并优化电荷存储行为。正如预期的那样，NiVO@CoNi-MOF/AC在1 mA/cm²时表现出高达19.20 F/cm²的比电容。由NiVO@CoNi-MOF/AC和退火后的活性炭布组装的不对称超级电容器（ASCs）在4 mW/cm²的功率密度下实现了1.27 mWh/cm³的能量密度，并且在10000次循环后电容保持率为96.43%。此外，NiVO@CoNi-MOF/AC作为电催化剂在10 mA/cm²时过电位为370 mV，塔菲尔斜率为208 mV/dec，展现出卓越的电催化析氧反应性能。这些独特的异质结构赋予电极更多的电化学选择性，并为设计多功能材料提供了新的关键见解。
