结晶度与粘合剂对多孔钴酸镁超电容电极能量传递效率的影响

摘要

The magnesium/cobalt ternary oxide,porous MgCo2O4 nanostructures were synthesized by thermal decomposition of crystalline bimetallic coordination polymer precursors.As a result,various hydrothermal reaction time results in isostructural precursors with different crystallinity.When the pyrolysis temperature and binder are chose to be 500 ℃ and PTFE respectively,the superior practical capacitance with good energy delivery efficiency (η) is obtained.The corresponding MgCo2O4 electrode with high surface area and moderate crystallinity achieves a largest specific capacitance of 348 F ·g-1,maximum η value (92.9％) and 93.7％ of capacitance retention after 1000 continuous charge-discharge cycles.%通过热解晶态的双金属配位聚合物前驱体得到镁/钴三元氧化物、多孔MgCo2O4纳米结构.研究表明,不同的水热反应时间产生具不同结晶度的同构前驱体,并且当热解温度与粘合剂分别选择500℃和聚四氟乙烯(PTFE)时,便可以获得具有好的能量传递效率(η)的最优电容量.相应的具有高比表面积与适中结晶度的MgCo2O4电极材料具有最大电容量(348 F·g-1),η值可达92.9％,经历1 000次循环后电容量保持率为93.7％的优异电化学性能.