کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1284172 | 1497972 | 2014 | 12 صفحه PDF | دانلود رایگان |
• A two-step approach is demonstrated to fabricate a porous, ultrathin PANI-RGO electrode.
• The thickness can be self-controlled by pH adjustment.
• The well-designed PANI-RGO electrodes exhibit excellent photovoltatic performances.
• The incorporation of RGO raises the transparency of PANI and photo harvest.
• A universal approach is well-designed to fabricate PANI-RGO-based conductive thin films.
A powerful synthesis strategy is proposed for fabricating porous polyaniline-reduced graphene oxide (PANI-RGO) composites with transparency up to 80% and thickness from 300 to 1000 nm for the counter electrode (CE) of bifacial dye-sensitizing solar cells (DSSCs). The first step is to combine the in-situ positive charge transformation of graphene oxide (GO) through aniline (ANI) prepolymerization and the electrostatic adsorption of ANI oligomer-GO to effectively control the thickness of ultrathin PANI-GO films by adjusting pH of the polymerization media. In the second step, PANI-GO films are reduced with hydroiodic acid to simultaneously enhance the apparent redox activity for the I3−/I− couple and their electronic conductivity. Incorporating the RGO increases the transparency of PANI and facilitates the light-harvesting from the rear side. A DSSC assembled with such a transparent PANI-RGO CE exhibits an excellent efficiency of 7.84%, comparable to 8.19% for a semi-transparent Pt-based DSSC. The high light-harvesting ability of PANI-RGO enhances the efficiency retention between rear- and front-illumination modes to 76.7%, compared with 69.1% for a PANI-based DSSC. The higher retention reduces the power-to-weight ratio and the total cost of bifacial DSSCs, which is also promising in other applications, such as windows, power generators, and panel screens.
Figure optionsDownload as PowerPoint slide
Journal: Journal of Power Sources - Volume 260, 15 August 2014, Pages 326–337