Vanadyl phosphate/reduced graphene oxide nanosheet hybrid material and its capacitance
Vanadyl phosphate/reduced graphene oxide nanosheet hybrid material and its capacitance
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磷酸氧钒/还原氧化石墨烯纳米片杂化材料及其电容
DOI：
10.1016/j.electacta.2015.08.007
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发表时间：
2015-10
影响因子：
6.6
通讯作者：
Liu Zong-Huai
中科院分区：
文献类型：
--
作者：
He Yibo;Yang Xiaofan;Bai Yonglong;Zhang Jinyang;Kang Liping;Lei Zhibin;Liu Zong-Huai
采用短程溶胀脱层-插层反应过程研究了二水磷酸氧钒（VOPO 4·2 H2O）的层状结构稳定性，其层间距可可逆控制，层状结构可保持到400 °C以上。通过在2-丙醇中使用分层的磷酸氧钒（VOPO 4）纳米片，不同VOPO 4纳米片与氧化石墨烯质量比的超级电容器用VOPO 4/还原氧化石墨烯杂化电极材料已经基于剥离的VOPO 4纳米片和GO纳米片之间的纳米片重组反应制备了纳米片，然后在管式炉中在400 °C下煅烧3小时，在0.5M K2 SO 4电解液中，通过循环伏安法和恒电流充放电研究了它们的电化学性能。VOPO 4/RGO质量比为1的VOPO 4/RGO杂化电极在5 mV s-1的扫描速率下表现出378 F g-1的高比电容，具有良好的倍率性能。该方法拓宽了VOPO 4纳米片的应用领域，也为超级电容器电极提供了有前景的候选材料。
The layered structure stability of bulk vanadyl phosphate dihydrate (VOPO4·2H2O) is investigated by using a deintercalation-intercalation reaction process involving short-range swelling, its basal spacing can be reversibility controlled and the layered structure can be maintained to above 400 °C. By using delaminated vanadyl phosphate (VOPO4) nanosheets in 2-propanol, VOPO4/reduced graphene oxide (RGO) hybrid electrode materials for supercapacitor with different mass ratios of VOPO4nanosheets to graphene oxide (GO) nanosheets have been prepared based on a nanosheet reassembling reaction between the exfoliated VOPO4nanosheets and GO nanosheets and followed by calcinating in a tubular furnace at 400 °C for 3 h under N2atmosphere, and their electrochemical properties are systematically investigated by cyclic voltammetry and galvanostatic charge-discharge in 0.5 M K2SO4electrolyte. The VOPO4/RGO hybrid electrode with a mass ratio of VOPO4/RGO = 1 exhibits a high specific capacitance of 378 F g−1at a scan rate of 5 mV s−1with a good rate capability. This method broadens the application filed of VOPO4nanosheets, and also supplies promising electrode candidates for supercapacitor.
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