Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 39, Pages 35641-35652Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b07966
Keywords
dye-sensitized solar cell; perovskite oxide; cathode; anion doping; electrocatalyst
Funding
- Australian Research Council [DP150104365, DP160104835]
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Triiodide/iodide (I-3(-)/I-) redox couple-mediated solar cells, batteries, and electrochromic devices require highly efficient and stable electrocatalysts for I-3(-) reduction reaction (IRR) to overcome performance limitations, whereas the widely used platinum (Pt) cathode for IRR has limitations of high price and unfavorable durability. In this work, we present a halogen element (chlorine) doping strategy to design low-cost perovskite-type electrocatalysts with enhanced IRR activity and stability. The dye-sensitized solar cell (DSSC) assembled by the LaFeO2.965-delta Cl0.035 cathode delivers an attractive power conversion efficiency (PCE) of 11.4% with a remarkable PCE enhancement factor of 23% compared with Pt, which is higher than most of the reported non-Pt DSSC cathodes. Attractively, LaFeO2.965-delta Cl0.035 displays superior IRR activity/stability and structural stability in the I-3(-)/I--based electrolyte compared to pristine LaFeO3 because chlorine doping facilitates the creation of oxygen vacancies (active sites) and enhances surface acidity simultaneously. This study provides a new way for designing outstanding IRR electrocatalysts, which could be applied to many redox couple-mediated photo/electrochemical devices.
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