Microwave-assisted high-yield exfoliation of vanadium pentoxide nanoribbons for supercapacitor applications
Microwave-assisted high-yield exfoliation of vanadium pentoxide nanoribbons for supercapacitor applications
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DOI：
10.1016/j.electacta.2019.135200
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发表时间：
2020-01
影响因子：
6.6
通讯作者：
Ya Chen;K. Muthukumar;Levon Leban;Jun Li
中科院分区：
文献类型：
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作者：
Ya Chen;K. Muthukumar;Levon Leban;Jun Li
超薄二维过渡金属氧化物材料作为电能存储材料具有很大的优势。目前，提高产量和加工技术是推动这些材料可扩展应用的首要任务之一。本文提出了一种新的微波辅助剥离技术，将α-V2 O 5晶体粉末剥离成褶皱纳米带。微波处理40 min后，V2 O 5纳米带的产率可达20%。剥离的V2 O 5纳米带进一步用于通过简单的阳离子介导的自组装过程与较大的氧化石墨烯（GO）纳米片形成强结合的杂化材料，并且通过热退火处理将2D GO模板转化为高导电的还原氧化石墨烯（rGO）纳米片。所获得的V2 O 5/rGO杂化材料表现出典型的电容行为，在1 A g-1下的比电容为423.6 F g-1，具有优异的高倍率性能和良好的循环稳定性。这些结果表明，令人兴奋的潜在的微波辅助技术的高产剥离的V2 O 5纳米带对未来的电能存储应用。
Ultrathin 2D transition metal oxide materials have great advantages as electrical energy storage materials. At present, improving the yield and processing techniques is one of the top priorities to push these materials for scalable applications. Here, a novel microwave-assisted technique is presented to exfoliate crystalline α-V2O5powder into wrinkled nanoribbons. The yield of the V2O5nanoribbons can reach up to 20% after 40 min of microwave treatment. The as-exfoliated V2O5nanoribbons are further used to form a strongly bound hybrid material with larger graphene oxide (GO) nanosheets through a simple cation-mediated self-assembly process, and the 2D GO template is converted into highly conductive reduced graphene oxide (rGO) nanosheets by thermal annealing treatment. The obtained V2O5/rGO hybrid material exhibits typical capacitive behavior with a specific capacitance of 423.6 F g−1at 1 A g−1, an excellent high-rate capability and good cycling stability. These results suggest the exciting potential of the microwave-assisted technique for high-yield exfoliation of V2O5nanoribbons toward future electrical energy storage applications.