Fractional structured molybdenum oxide catalyst as counter electrodes of all-solid-state fiber dye-sensitized solar cells

• Published in: Journal of colloid and interface science 2021-02, Vol.584, p.520-527
• Main Authors: Utomo, Drajad Satrio, Kim, Jae Ho, Lee, Daseul, Park, Juyun, Kang, Yong-Cheol, Kim, Yong Hyun, Choi, Jin Woo, Song, Myungkwan
• Format: Article
• Language: English
• Subjects: Catalyst; Counter electrode; Dye-sensitized solar cell; Fiber electronics; Molybdenum oxide
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2020.10.003

[Display omitted] •Stable and washable solid state fiber solar cells are important for future wearable electronics.•New sol-gel processed MoO3 counter electrodes were fabricated.•Micro fractional MoO3 shows efficient catalytic charge transfer characteristic•MoO3 counter electrode shows stable characteristics even after bending and laundry test. A novel hierarchical solution-processed fractional structured molybdenum oxide (MoO3) catalyst is fabricated from tricarbonyltris (propionitrile) molybdenum and used as the counter electrode of all-solid-state fiber-shaped dye-sensitized solar cells (S-FDSSC). The Tafel plot results and electrical impedance spectroscopy suggest that the use of the fractional structured MoO3 catalyst enhances the efficiency of the reduction of I3− to 3I− at the counter electrode/electrolyte interface. Because of the improvements of the short-current circuit and fill factor, the power conversion efficiency of the MoO3-modified S-FDSSC improves by 60% compared with that of the reference S-FDSSC. In addition, because of the robust fractional structure of MoO3, the MoO3-modified S-FDSSC maintains 90% and 95% of efficiency after 350-fold bending and the incident light angle dependency test, respectively. At 65% humidity and at 65 °C, the power conversion efficiency of the MoO3-modified device decreases by