Cost-Efficient Chemical Bath Synthesized Alloy Catalysts PtM0.05 (M = Fe, Co, Ni) Acting as Counter Electrodes for CdS Quantum Dot Sensitized Solar Cell
Dual functional counter electrode electrocatalysts with excellent electrochemical activity and stability are always pursued in dye or quantum dot-sensitized solar cells whilst quantum dots have garnered increasing interests due to the size-dependent bandgap, highly efficient photoluminescence and the great promise of light harvesting materials. In the present work, Pt alloys with transitional metals (M = Fe, Co, Ni) was synthesized using mild chemical bath solution and have been employed acting as counter electrodes. Cadmium sulphide quantum dots were prepared using successive ionic layer absorption and reaction. The results demonstrate that the binary Pt–Fe alloy can markedly enhance the electrocatalytic behaviour by 37% than pure Pt based device. The underlying origin for efficiency enhancement was explored in terms of the electrocatalytic activity and stability of counter electrodes, charge transfer resistance and charge carrier lifetime, etc. The alloyed engineering of Pt-based counter electrodes provides a pragmatic direction towards low-cost and stable sensitized solar devices.
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Document Type: Research Article
Publication date: October 1, 2018
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