Jump to main content
Jump to site search


Hierarchical urchin-like CoSe2/CoSeO3 electro-catalysts for dye-sensitized solar cells: up to 19% PCE under dim light illumination

Author affiliations

Abstract

A hierarchical urchin-like structure of CoSe2/CoSeO3 (denoted as CoSe2/CoSeO3-UL) is synthesized by a one-step hydrothermal method and investigated as the electro-catalyst for the counter electrode (CE) of dye-sensitized solar cells (DSSCs). The evolution of the CoSe2/CoSeO3 nanostructures as a function of the synthesis time has been identified by scanning electron microscopy. The growth mechanism is proposed and the desired CoSe2/CoSeO3 hierarchical UL structure is noticed at 4 h. CoSe2/CoSeO3-UL consists of nanoparticles and hexagonal prisms for providing a high surface area for catalytic reactions and a one dimensional charge transport route, respectively. The results show that DSSCs using the CoSe2/CoSeO3-UL CE exhibit a higher power conversion efficiency (η) of 9.29 ± 0.24% than that of the cell using a Pt CE (8.33 ± 0.07%). Under various dim light conditions (i.e., a T5 lamp), the DSSC with the CoSe2/CoSeO3-UL CE shows outstanding η's of 19.88 ± 0.10%, 18.24 ± 0.06%, and 16.00 ± 0.13% at 7000 lux (2.21 mW cm−2), 6000 lux (1.89 mW cm−2) and 4800 lux (1.55 mW cm−2), respectively. This study demonstrates that CoSe2/CoSeO3-UL has great potential to replace Pt in DSSCs, and the application of DSSCs can be extended from outdoor to indoor conditions.

Graphical abstract: Hierarchical urchin-like CoSe2/CoSeO3 electro-catalysts for dye-sensitized solar cells: up to 19% PCE under dim light illumination

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Aug 2019, accepted on 21 Oct 2019 and first published on 21 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA09166A
J. Mater. Chem. A, 2019, Advance Article

  •   Request permissions

    Hierarchical urchin-like CoSe2/CoSeO3 electro-catalysts for dye-sensitized solar cells: up to 19% PCE under dim light illumination

    Y. Huang, H. Chen, S. Ann, C. Li, J. T. Lin, C. Lee and K. Ho, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA09166A

Search articles by author

Spotlight

Advertisements