论文标题
非对称超级电容器：当活性碳电极与纳米尺度的半导体点嵌入光学和热效应
Asymmetric supercapacitors: optical and thermal effects when active carbon electrodes are embedded with nano-scale semiconductor dots
论文作者
论文摘要
报道了不对称超级电容器的光学和热效应，其活性碳（AC）电极与纳米-SI（N-SI）量子点（QD）嵌入。我们描述了两个结构：（1）p-n，是通过使用聚乙基胺（PEI）粘合剂进行N样电极获得的，而Polvinylpyrrololidone（PVP）粘合剂获得了P-Like电极； （2）单个成分粘合剂，聚（甲基丙烯酸甲酯）（PMMA）。通常，AC在肉眼上看起来是黑色的，人们可能会认为它是黑体吸收器，即，不加选择地吸收所有光谱。然而，除了平坦的损失光谱外，AC（来自两个制造商）表现出两个不同的吸收带：一个是蓝色（〜400 nm），另一个在近IR（〜840 nm）中。 N-SI材料突显了蓝色的吸收并漂白了IR吸收。两种频段都导致电容增加：（a）当使用水溶液和PMMA粘合剂时，在低N-SI浓度下，光学相关的增加电容为20％，高浓度剂量的电容为100％； （b）当使用IL电解质时，大的热电容增加（CA 40％）与光学效应（Ca 42％）相当，因此被分配为光学诱导的热效应。实验数据表明，即使没有N-SI点，光学诱导的电容也会增加。这可以归因于AC在蓝色中的吸收。
Optical and thermal effects in asymmetric supercapacitors, whose active-carbon (AC) electrodes were embedded with nano-Si (n-Si) quantum dots (QD), are reported. We describe two structures: (1) p-n like, obtained by using a polyethylimine (PEI) binder for the n-like electrode and a polyvinylpyrrolidone (PVP) binder for the p-like electrode; (2) a single component binder, poly(methyl methacrylate) (PMMA). In general, AC appears black to the naked eye and one may assume that it acts as a black body absorber, namely, indiscriminately absorbing all light spectra. Yet, on top of a flat lossy spectra, AC (from two manufacturers) exhibited two distinct absorption bands: one in the blue (~ 400 nm) and the other one in the near IR (~ 840 nm). The n-Si material accentuated the absorption in the blue and bleached the IR absorption. Both bands contributed to capacitance increase: (a) when using aqueous solution and a PMMA binder, the optical related increased capacitance was 20% at low n-Si concentration and more than 100% for a high concentration dose; (b) when using IL electrolyte, the large, thermal capacitance increase (of ca 40%) was comparable to the optical effect (of ca 42%) and hence was assigned as an optically-induced thermal effect. The experimental data point to an optically induced capacitance increase even in the absence of the n-Si dots; this could be attributed to the absorption of AC in the blue.
