Marchini Edoardo, Orlandi Michele, Bazzanella Nicola, Boaretto Rita, Cristino Vito, Miotello Antonio, Caramori Stefano, Carli Stefano
Department of Chemical, Pharmaceutical and Agrarian Sciences, University of Ferrara, 44121 Ferrara, Italy.
Department of Physics, University of Trento, Via Sommarive 14, 38123 Trento, Italy.
ACS Omega. 2022 Aug 11;7(33):29181-29194. doi: 10.1021/acsomega.2c03229. eCollection 2022 Aug 23.
PEDOT-based counter electrodes for dye-sensitized solar cells (DSSCs) are generally prepared by electrodeposition, which produces polymer films endowed with the best electrocatalytic properties. This translates in fast regeneration of the redox mediator, which allows the solar cell to sustain efficient photoconversion. The sustainable fabrication of DSSCs must consider the scaling up of the entire process, and when possible, it should avoid the use of large amounts of hazardous and/or inflammable chemicals, such as organic solvents for instance. This is why electrodeposition of PEDOT-based counter electrodes should preferably be carried out in aqueous media. In this study, PEDOT/Nafion was electrodeposited on FTO and comparatively evaluated as a catalytic material in DSSCs based on either cobalt or copper electrolytes. Our results show that the electrochemical response of PEDOT/Nafion toward Co(II/III-) or Cu(I/II)-based redox shuttles was comparable to that of PEDOT/ClO and significantly superior to that of PEDOT/PSS. In addition, when tested for adhesion, PEDOT/Nafion films were more stable for delamination if compared to PEDOT/ClO, a feature that may prove beneficial in view of the long-term stability of solar devices.
用于染料敏化太阳能电池（DSSC）的基于聚（3,4-乙撑二氧噻吩）（PEDOT）的对电极通常通过电沉积制备，该方法可制备出具有最佳电催化性能的聚合物薄膜。这使得氧化还原介质能够快速再生，从而使太阳能电池维持高效的光转换。DSSC的可持续制造必须考虑整个过程的扩大规模，并且在可能的情况下，应避免使用大量危险和/或易燃化学品，例如有机溶剂。这就是为什么基于PEDOT的对电极的电沉积最好在水性介质中进行。在本研究中，PEDOT/磺化聚醚砜（Nafion）被电沉积在氟掺杂氧化锡（FTO）上，并作为基于钴或铜电解质的DSSC中的催化材料进行了比较评估。我们的结果表明，PEDOT/Nafion对基于Co（II/III-）或Cu（I/II）的氧化还原穿梭体的电化学响应与PEDOT/高氯酸根（ClO）相当，并且明显优于PEDOT/聚苯乙烯磺酸钠（PSS）。此外，在测试附着力时，与PEDOT/ClO相比，PEDOT/Nafion薄膜更不易分层，鉴于太阳能器件的长期稳定性，这一特性可能被证明是有益的。
