Chang Jung-Hsien, Chen Song-Yu, Kuo Yu-Lin, Yang Chii-Rong, Chen Jian-Zhang
Graduate Institute of Applied Mechanics, National Taiwan University, Taipei City 10617, Taiwan.
Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei City 10617, Taiwan.
Materials (Basel). 2021 May 24;14(11):2777. doi: 10.3390/ma14112777.
Pastes containing reduced graphene oxide (rGO) and SnCl solution were screen printed on carbon cloth and then calcined using a CO tornado-type atmospheric-pressure plasma jet (APPJ). The tornado circulation of the plasma gas enhances the mixing of the reactive plasma species and thus ensures better reaction uniformity. Scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS) were performed to characterize the synthesized rGO-SnO nanocomposites on carbon cloth. After CO tornado-type APPJ treatment, the pastes were converted into rGO-SnO nanocomposites for use as the active electrode materials of polyvinyl alcohol (PVA)-HSO gel-electrolyte flexible supercapacitors (SCs). Various APPJ scanning times were tested to obtain SCs with optimized performance. With seven APPJ scans, the SC achieved the best areal capacitance of 37.17 mF/cm in Galvanostatic charging/discharging (GCD) and a capacitance retention rate of 84.2% after 10,000-cycle cyclic voltammetry (CV) tests. The capacitance contribution ratio, calculated as pseudocapacitance/electrical double layer capacitance (PC/EDLC), is ~50/50 as analyzed by the Trasatti method. GCD data were also analyzed to obtain Ragone plots; these indicated an energy density comparable to those of SCs processed using a fixed-point nitrogen APPJ in our previous study.
将含有还原氧化石墨烯（rGO）和SnCl溶液的浆料丝网印刷在碳布上，然后使用CO龙卷风型大气压等离子体射流（APPJ）进行煅烧。等离子体气体的龙卷风循环增强了反应性等离子体物种的混合，从而确保了更好的反应均匀性。进行扫描电子显微镜（SEM）、能量色散光谱（EDS）和X射线光电子能谱（XPS）以表征碳布上合成的rGO-SnO纳米复合材料。经过CO龙卷风型APPJ处理后，浆料转化为rGO-SnO纳米复合材料，用作聚乙烯醇（PVA）-HSO凝胶电解质柔性超级电容器（SCs）的活性电极材料。测试了各种APPJ扫描时间以获得性能优化的SCs。经过7次APPJ扫描，该SCs在恒电流充放电（GCD）中实现了37.17 mF/cm的最佳面积电容，在10000次循环伏安法（CV）测试后电容保持率为84.2%。通过Trasatti方法分析，电容贡献比（计算为赝电容/双电层电容（PC/EDLC））约为50/50。还对GCD数据进行了分析以获得Ragone图；这些图表明能量密度与我们之前研究中使用定点氮APPJ处理的SCs相当。
