Impedance Characteristics of Transparent GNP-Pt Ink Catalysts for Flexible Dye Sensitized Solar Cells
Impedance Characteristics of Transparent GNP-Pt Ink Catalysts for Flexible Dye Sensitized Solar Cells
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DOI：
10.1149/2.0961508jes
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发表时间：
2015
影响因子：
3.9
通讯作者：
J. Baker;J. Mcgettrick;D. Gethin;T. Watson
中科院分区：
文献类型：
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作者：
J. Baker;J. Mcgettrick;D. Gethin;T. Watson
通过将铂热还原到石墨烯纳米片（GNP）颗粒的表面上，可以显著提高染料敏化太阳能电池（DSC）中的碘化物/三碘化物反应的催化活性。GNP-Pt颗粒可用于配制高催化性但透明的油墨，其可通过多种不同技术沉积，例如柔性版印刷、K-棒、狭缝模头和旋涂。用阻抗谱表征了该油墨的催化性能，阻抗谱呈现出碳电极常见的高频阻抗曲线。这种阻抗的起源有许多相反的假设，这些假设被严格审查。数据支持这样的假设：高频曲线是由于GNP-Pt墨水和FTO之间的接触电阻造成的。除了高频曲线之外，还识别了先前未解决的低频阻抗。当制造成DSC时，油墨催化剂显示出高达5.2%的电池效率，并且当用于反向照射DSC（通过对电极）时，显示出与常规溅射铂具有相似的性能。报道了第一个具有GNP-Pt油墨催化剂的柔性反向照射DSC，其适用于卷对卷沉积，效率为2.6%。
By thermally reducing platinum onto the surface of Graphene Nanoplatelet (GNP) particles the catalytic activity of the iodide/triiodide reaction in dye-sensitized solar cells (DSC) can be improved significantly. The GNP-Pt particles can be used to formulate a highly catalytic yet transparent ink, which can be deposited by a number of different technologies such as flexographic printing, K-bar, slot-die and spin coating. The catalytic performance of the ink has been characterized using impedance spectroscopy, the impedance spectra show a high frequency impedance curve often seen in carbon electrodes. The origin of this impedance has a number of opposing hypotheses which are critically examined. The data supports the hypothesis that the high frequency curve is due to a contact resistance between the GNP-Pt ink and the FTO. In addition to the high frequency curve, a previously unresolved low frequency impedance is identified. When fabricated into DSCs the ink catalyst demonstrates cell efficiencies up to 5.2% and is shown to have a similar performance to conventional sputtered platinum when used in a reverse illuminated DSC (through the counter electrode). The first flexible reverse illuminated DSC with a GNP-Pt ink catalyst, suitable for roll-to-roll deposition is reported with an efficiency of 2.6%.