2,6-二氨基蒽醌/还原氧化石墨烯复合材料的制备及在锂有机电池的应用

采用水热合成法和冷冻干燥技术制备了2,6-二氨基蒽醌(2,6-AAQ)/rGO复合材料,通过氨基(—NH2)与羧基(—COOH)形成肽键(—CO—NH—)共价键,使其在电解液中的溶解问题从本质上得到了解决.SEM和EDS Mapping表明,2,6-AAQ/rGO-3复合材料中的2,6-AAQ呈现出高度的棒状结构,并且被石墨烯包裹得更紧密.这种独特的结构提高了2,6-AAQ在锂化过程中的电子导电性,可有效减少2,6-AAQ的聚集,利于电解质的浸润.XPS、XRD、FTIR和Raman结果表明,2,6-AAQ和rGO之间发生了水热辅助化学键合,形成了rGO包裹2,6-AAQ的结构.此外,非原位FTIR表征结果验证了2,6-AAQ/rGO-3具有良好的储锂性能,羰基(C=O)为反应位点.同时,紫外-可见光谱测试清楚表明,与2,6-AAQ相比,通过肽键连接的2,6-AAQ/rGO-3的溶解度显著降低,表明电化学性能大大提高.其中2,6-AAQ/rGO-3作为锂离子电池正极时,在100 mA·g^-1电流下,首圈放电容量高达212.2 mA·h·g^-1...     

SnO2 nanosheet as a photoanode interfacial layer for dyesensitized solar cells

SnO2 nanosheet films about 200 nm in thickness are successfully fabricated on fluorine-doped tin oxide (FTO) glass by a facile solution-grown approach. The prepared SnO2 nanosheet film is applied as an interfacial layer between the nanocrystalline TiO2 film and the FTO substrate in dye-sensitized solar cells (DSCs). Experimental results show that the introduction of a SnO2 nanosheet film not only suppresses the electron back-transport reaction at the electrolyte/FTO interface but also provides an efficient electron transition channel along the SnO2 nanosheets, and as a result, increasing the open circuit voltage and short current density, and finally improving the conversion efficiency for the DSCs from 3.89% to 4.62%.