Ma Xiaoxiao, Bai Yunfan, Chen Shuangli, He Zhixian, Wu Pingping, Qi Yabing, Zhang Sijing
School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
Instrumental Analysis Center, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
Phys Chem Chem Phys. 2024 Nov 20;26(45):28746-28756. doi: 10.1039/d4cp02882a.
Electrochemical energy storage heavily depends on the activity and stability of electrode materials. However, the direct use of metal-organic frameworks (MOFs) as supercapacitor electrode materials poses challenges due to their low electrical conductivity. In this study, pineapple leaf-derived biochar (PLB) was employed as a carrier for bimetallic ZnCo-MOF, resulting in the composite ZnCo-MOF@PLB-800, synthesized through growth and pyrolysis at 800 °C. The highly porous structure of PLB alleviated the aggregation of ZnCo-MOF particles, thereby enhancing the electron transfer rate and improving the conductivity of the electrode material. Electrochemical testing revealed that ZnCo-MOF@PLB-800 achieved a specific capacitance of 698.5 F g at a current density of 1 A g. The assembled asymmetric supercapacitor (ASC) demonstrated excellent specific capacitance and electrochemical stability, delivering a high energy density of 35.85 W h kg at a power density of 350 W kg, with robust cycle stability, retaining 90.4% capacitance after 8000 cycles. This work offers an effective integration of bimetallic MOFs with waste biomass-derived porous carbon for electrode materials, supporting both energy storage applications and environmental sustainability.
电化学储能严重依赖于电极材料的活性和稳定性。然而，直接将金属有机框架（MOF）用作超级电容器电极材料存在挑战，因为其电导率较低。在本研究中，菠萝叶衍生的生物炭（PLB）被用作双金属ZnCo-MOF的载体，通过在800℃下生长和热解合成了复合ZnCo-MOF@PLB-800。PLB的高度多孔结构减轻了ZnCo-MOF颗粒的聚集，从而提高了电子转移速率并改善了电极材料的导电性。电化学测试表明，ZnCo-MOF@PLB-800在1 A g的电流密度下实现了698.5 F g的比电容。组装的不对称超级电容器（ASC）表现出优异的比电容和电化学稳定性，在350 W kg的功率密度下提供35.85 W h kg的高能量密度，具有强大的循环稳定性，在8000次循环后保持90.4%的电容。这项工作为电极材料提供了双金属MOF与废弃生物质衍生的多孔碳的有效整合，支持储能应用和环境可持续性。
