A Laser Irradiation Synthesis of Strongly-coupled VOx-reduced Graphene Oxide Composites as Enhanced Performance Supercapacitor Electrodes
A Laser Irradiation Synthesis of Strongly-coupled VOx-reduced Graphene Oxide Composites as Enhanced Performance Supercapacitor Electrodes
复制标题
激光辐照合成强耦合 VOx 还原氧化石墨烯复合材料作为增强性能超级电容器电极
DOI：
10.1016/j.mtener.2017.07.004
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发表时间：
2017
影响因子：
9.3
通讯作者：
Chun Cheng
中科院分区：
文献类型：
--
作者：
Zhang LinFei;Jun Tang;ShiYuan Liu;OuWen Peng;Run Shi;B. N. Ch;ru;Yan Li;Xin Li;XiangNan Li;BaoMin Xu;Chun Cheng
提出了一种独特的技术，通过激光照射V2 O 5纳米带和GO纳米片的混合物来合成三维分级钒氧化物/还原氧化石墨烯复合材料（表示为3D VOx/rGO复合材料）。电子显微镜和X射线光电子能谱（XPS）研究表明，多分散的V2 O 5/VO 2异质结构纳米粒子与rGO形成了强耦合。结果，3D VOx/rGO复合材料在用作超级电容器电极时实现了252 F g-1的比电容，并且即使在100 A g-1的电流密度下经过10000次循环后，电容也可以保持初始比电容的92%。三维VOx/rGO复合材料的比表面积显著增加，有利于电解质的进入，提供了较大的电活性表面积，VOx纳米颗粒与rGO之间形成了较强的V单键C键，有利于有效的电荷转移，从而提高了超级电容器的性能.我们相信，简易的激光照射方法不仅是简单有效地制造高性能电极的重要一步，而且在激光加工合成其他功能性分级纳米复合材料的实际应用中也是如此。
A unique technique is present to synthesize three dimensional hierarchical vanadium oxides/reduced graphene oxide composites (denoted as 3D VOx/rGO composites) by laser irradiation over the mixture of V2O5nanobelts and GO nanosheets. Electron microscopy and X-ray photoelectron spectroscopy (XPS) examinations reveal that polydisperse V2O5/VO2heterostructured nanoparticles form strong coupling with rGO. As a result, a specific capacitance of 252 F g−1is achieved for 3D VOx/rGO composites when used as supercapacitor electrodes, and the capacitance can retain 92% of the initial specific capacitance even after 10000 cycles at a current density of 100 A g−1. The improvement of supercapacitor performance is achieved by significantly increase on specific surface area of 3D VOx/rGO composites, which favors the easy access of the electrolyte and provides large electroactive surface, and strong Vsingle bondOsingle bondC bond between VOxnanoparticles and rGO, which benefits the effective charge transfer. We believe that the facile laser irradiation approach represents a major step not only for the simple and efficient fabrication of high performance electrodes but also in the practical application of laser processing to synthesize other functional hierarchical nanocomposites.