Xu Juan, Li Chongyang, Chen Lulu, Li Zhongyang, Bing Pibin
Institute of Electric Power, North China University of Water Resources and Electric Power Zhengzhou Henan 450000 China
RSC Adv. 2019 Sep 12;9(49):28793-28798. doi: 10.1039/c9ra03886h. eCollection 2019 Sep 9.
Herein, novel hierarchical carbon layer-anchored WO /C ultra-long nanowires were developed a facile solvent-thermal treatment and a subsequent rapid carbonization process. The inner anchored carbon layers and abundant oxygen vacancies endowed the WO /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 WO /C electrode exhibited outstanding specific capacitance of 1032.16 F g at the current density of 1 A g in a 2 M HSO electrolyte and maintained the specific capacitance of 660 F g when the current density increased to 50 A g. Significantly, the constructed WO /C//WO /C symmetric supercapacitors achieved specific capacitance of 243.84 F g at the current density of 0.5 A g and maintained the capacitance retention of 94.29% after 5000 charging/discharging cycles at the current density of 4 A g. These excellent electrochemical performances resulted from the fascinating structure of the WO /C nanowires, showing a great potential for future energy storage applications.
在此，通过简便的溶剂热法和随后的快速碳化过程，制备出了新型的具有分级碳层锚定的WO₃/C超长纳米线。内部锚定的碳层和丰富的氧空位赋予了WO₃/C纳米线电极高导电性，单根纳米线的测量结果表明，这极大地增强了氧化还原反应活性位点和倍率性能。令人惊讶的是，在2 M H₂SO₄电解液中，WO₃/C电极在1 A g⁻¹的电流密度下展现出1032.16 F g⁻¹的出色比电容，当电流密度增加到50 A g⁻¹时，比电容仍保持在660 F g⁻¹。值得注意的是，构建的WO₃/C//WO₃/C对称超级电容器在0.5 A g⁻¹的电流密度下比电容达到243.84 F g⁻¹，在4 A g⁻¹的电流密度下经过5000次充放电循环后，电容保持率为94.29%。这些优异的电化学性能源于WO₃/C纳米线迷人的结构，显示出其在未来储能应用中的巨大潜力。
