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Biocarbon-supported CeO2/co3O4 hybrid counter electrode for enhanced DSSC efficiency
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DOI：10.1007/s10934-025-01909-4.png)
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Abstract
En 中文
Dye-sensitized solar cells (DSSCs) are a promising new type of ecologically friendly solar panel, but their widespread application has been dragged down by the high cost and restricted supply of the platinum (Pt) needed as a counter electrode. To get around this problem, a new hybrid counter electrode made of biocarbon and cerium oxide/cobalt oxide (BC@CeO2/Co3O4) was made utilizing a simple hydrothermal technique. This combined arrangement used thin biocarbon nanosheets to cover evenly spaced cubic CeO2 and Co3O(4) nanoparticles, which made a tightly packed and interrelated nanostructured assembly. Using XRD, FTIR, FESEM, and TEM to look into the structure and form showed that CeO2 and Co3O(4) crystalline phases may exist together without any noticeable lattice distortion. XPS spectra showed mixed oxidation states of Ce3+/Ce4+ and Co3+/Co3+, which has implications for speeding up redox reactions at the electrode-electrolyte junction. The BET surface area analysis showed that the BC@CeO2/ Co3O(4) composite was much better than the CeO2/ Co3O(4) composite, with a value of 112.5 m2 g- 1. Because the material's average pore diameter was about 3.5 nm, there were many places where ions could move and electrolytes could diffuse. Different electrochemical tests, like CV, Tafel, and EIS, have shown that BC@CeO2/ Co3O(4) has a good charge-transfer efficiency. This is obvious from the low charge-transfer resistance (Rct = 1.95 Omega), low series resistance (Rs = 0.52 Omega), and high double-layer capacitance (Cdl = 36.7 mF cm- 2). The readings for the CeO2/ Co3O(4) electrode (Cdl = 12.5 mF cm- 2) are much lower. The DSSC with the BC@CeO2/ Co3O(4) counter electrode has a power conversion efficiency (PCE) of 8.5%, which is higher than the CeO2/Co3O(4) (5.6%) and the conventional Pt-based device (6.7%). The BC@CeO2/ Co3O(4) electrode improves redox kinetics, speeds up the flow of electrons, and makes charge transfer more efficient at the interfacial boundary. This leads to excellent photovoltaic efficiency and long-term stability. So, the BC@CeO2/ Co3O(4) hybrid material is a great, cheap, and long-lasting replacement for Pt in next-generation DSSC applications.
Keywords:
Dye-sensitized solar cells
Biocarbon
CeO2/co(3)O(4)
Counter electrode
Charge transfer
Photovoltaic performance
Pt-free catalyst
Journal
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3.2
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154
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