Aqueous Al-Ion Supercapacitor with V2O5 Mesoporous Carbon Electrodes
Aqueous Al-Ion Supercapacitor with V2O5 Mesoporous Carbon Electrodes
复制标题
具有 V2O5 介孔碳电极的水系铝离子超级电容器
DOI：
10.1021/acsami.9b02030
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发表时间：
2019-05-01
影响因子：
9.5
通讯作者：
Cao, Guozhong
中科院分区：
文献类型：
--
作者：
Tian, Meng;Li, Ruihan;Cao, Guozhong
基于纳米V2 O 5浸渍介孔碳微球（MCM/V2 O 5）电极和Al-2（SO 4）（3）电解液制备了一种高性能、低成本的水溶液铝离子超级电容器。MCM/V2 O 5复合材料中V2 O 5纳米粒子高度分散于介孔碳基体中，有利于快速可逆的氧化还原反应，且扩散路径短，其电容器表现出明显的氧化还原行为，这可能是由于Al 3+的嵌入/脱嵌导致V5+/V4+的还原/氧化。它在147 W kg（-1）时提供18.0 Wh kg（-1）的高能量密度和长循环寿命，在10000次循环中保持88%以上的电容。这种竞争性的性能可以归因于MCM提供的双电层电容与纳米结构V2 O 5贡献的赝电容的集成。本研究为基于三价铝离子作为客体物种的高性能水溶液电容器的制备提供了可能性，为超级电容器的未来发展提供了新的方向。
A high-performance, low-cost, aqueous Al-ion supercapacitor was fabricated based on nanostructured V2O5 impregnated mesoporous carbon microspheres (MCM/V2O5) electrodes and Al-2(SO4)(3) electrolyte for efficient energy storage. MCM/V2O5 composites exhibit high dispersion of nanostructured V2O5 in a mesoporous carbon matrix, beneficial to fast reversible redox reactions with a short diffusion path. The corresponding capacitor illustrates the distinguishable redox behavior, most likely due to the Al3+ intercalation/deintercalation leading to the reduction/oxidation of V5+/V4+. It delivers a high-energy density of 18.0 Wh kg(-1) at 147 W kg(-1) and a long cycling lifespan with over 88% capacitance retention over 10 000 cycles. The competitive performance can be ascribed to the integration of the electric double layer capacitance provided from MCM with pseudocapacitance contributed by nanostructured V2O5. This work offers the possibilities of high-performance aqueous capacitors based on trivalent Al-ion as guest species, providing new directions for future development of supercapacitors.