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Anchoring carbon layers and oxygen vacancies endow WO3-x/C electrode with high specific capacity and rate performance for supercapacitors

机译:锚固碳层和氧空位赋予WO3-X / C电极,具有超级电容器的高特定容量和速率性能

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Herein, novel hierarchical carbon layer-anchored WO3-x/C ultra-long nanowires were developed via a facile solvent-thermal treatment and a subsequent rapid carbonization process. The inner anchored carbon layers and abundant oxygen vacancies endowed the WO3-x/C nanowire electrode with high conductivity, as measured with a single nanowire, which greatly enhanced the redox reaction active sites and rate performance. Surprisingly, the WO3-x/C electrode exhibited outstanding specific capacitance of 1032.16 F g(-1) at the current density of 1 A g(-1) in a 2 M H2SO4 electrolyte and maintained the specific capacitance of 660 F g(-1) when the current density increased to 50 A g(-1). Significantly, the constructed WO3-x/C//WO3-x/C symmetric supercapacitors achieved specific capacitance of 243.84 F g(-1) at the current density of 0.5 A g(-1) and maintained the capacitance retention of 94.29% after 5000 charging/discharging cycles at the current density of 4 A g(-1). These excellent electrochemical performances resulted from the fascinating structure of the WO3-x/C nanowires, showing a great potential for future energy storage applications.
机译:这里,通过容易溶剂 - 热处理和随后的快速碳化过程开发了新型等级碳层锚定的WO3-X / C超长纳米线。内锚定的碳层和丰富的氧空位赋予WO3-X / C纳米线电极,具有高导电性,用单个纳米线测量,大大提高了氧化还原反应活性位点和速率性能。令人惊讶的是,WO3-X / C电极在2M H 2 SO 4电解质中的电流密度为1Ag(-1)的突出特异性电容为1032.16 f g(-1),并保持660 f g的特定电容( - 1)当电流密度增加到50Ag(-1)时。显着地,构造的WO3-X / C // WO3-X / C对称超级电容器以0.5Ag(-1)的电流密度,在电流密度下实现了243.84fg(-1)的特定电容,并将电容保留为94.29% 5000充电/放电循环,电流密度为4Ag(-1)。这些优异的电化学性能由WO3-X / C纳米线的迷人结构产生,显示未来能量存储应用的巨大潜力。

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    《RSC Advances》 |2019年第49期|共6页
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  • 正文语种 eng
  • 中图分类 化学;
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