Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 4, Pages 3851-3860Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00248
Keywords
dye-sensitized solar cells; carbon paper; CoP/CoMoP2; counter electrode; power conversion efficiency
Funding
- NSFC [61704047]
- Science and Technology Development Program of Henan Province [212102210126]
- Intelligence Introduction Plan of Henan Province [CXJD2021008]
- Key Research Project of Henan Provincial Higher Education [19A140007]
- Natural Science Foundation for Young Scientists of Henan Province [202300410060]
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The CoP/CoMoP2 composite CE designed with a sodium molybdate-assisted strategy showed better performance in DSSCs compared to traditional Pt and CoP CEs, achieving an impressive power conversion efficiency of 8.69%.
Designing efficient and economical dye-sensitized solar cells (DSSCs) free of precious metals is required to replace the platinum counter electrode (Pt CE) for further large-scale development. Herein, we have designed a sodium molybdate-assisted strategy for growing a transition-metal phosphide composite of cobalt phosphide and cobalt molybdenum phosphorus (CoP/CoMoP2) on carbon paper via the hydrothermal reaction and low-temperature phosphating methods. The CoP/CoMoP2 composite with a spherical polyhedral structure has been shown to exhibit better electrochemical and photoelectrochemical properties than the Pt and pure CoP CEs through a series of electrochemical and photoelectrochemical tests. Interestingly, the short-current density of the DSSC with the CoP/CoMoP2 CE has been greatly improved after adding sodium molybdate than that of the DSSC with the CoP CE. Under optimal conditions, the DSSC based on the CoP/CoMoP2 composite CE achieves impressive power conversion efficiency as high as 8.69%, which remarkably exceeds that of the DSSCs with the CoP CE (6.19%) and the Pt CE (7.74%).
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