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In situ electrodeposition of nickel cobalt selenides?on FTO as an efficient counter electrode for dye-sensitized solar cells
摘要： Construction of transition metal selenides with high electrocatalytic performance is of significant importance, but it is still a challenge to develop the corresponding counter electrodes (CEs) by an electrodeposition technique. In the present work, nickel cobalt selenide (NixCoySe) films are prepared in situ on fluorine-doped tin oxide (FTO) glasses through a potential reversal electrodeposition technique. The morphology and electronic structure of NixCoySe films can be tuned by controlling the Ni/Co molar ratio in electroplating solution. Specially, NixCoySe-6 film (the Ni/Co molar ratio of 1:1) with the optimized interaction between the Ni and Co elements displays numerous particles composed of sheets attached with nanocrystals, resulting in the more electrocatalytic active sites. Benefiting from the unique morphology and optimized synergistic effect, NixCoySe-6 CE exhibits superior electrocatalytic activity for the triiodide reduction. Then, the dye-sensitized solar cell (DSC) fabricated by NixCoySe-6 CE has demonstrated a power conversion efficiency (PCE) over 7.40%, which is higher than that of platinum (Pt)-based device (6.32%). Furthermore, NixCoySe-6 array CE is also prepared by using polystyrene array as template. The PCE of the DSC with NixCoySe-6 array CE reaches its maximum value of 7.64% and 20.9% larger than that of Pt-based device.
关键词： Potential reversal electrodeposition technique,Synergistic effect,Nickel cobalt selenides,Counter electrodes,Array
更新于2025-09-16 10:30:52
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Enhanced photovoltaic performance of dye-sensitized solar cells based on electrodeposited sulfur-doped MSex (M=Co, Ni) films
摘要： Rational design of ternary transition metal sulfoselenide films by an electrodeposition technique remains a critical challenge to further improve their catalytic activity. This study reports a fabrication approach of sulfur-doped MSex (M ? Co, Ni) films, which are directly employed as efficient counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). The morphology and electronic structure of sulfur-doped MSex films are controlled by adjusting the molar ratio of S/Se in their electrodeposition solutions. It is found that sulfur-doped MSex films exhibit favorable electrocatalytic activity for the reduction of I3, owing to their more exposed activity sites and strong charge-transfer capability. Furthermore, the DSSC fabricated with the optimized sulfur-doped CoSex (sulfur-doped NiSex) CE has achieved the highest power conversion efficiency (PCE) of 7.44% (7.54%) than that of the DSSC fabricated with platinum (Pt) CE (6.38%). The results demonstrate that sulfur-doped MSex films have been applied as the attractive low-cost CEs with outstanding electrocatalytic activity for DSSCs.
关键词： Counter electrodes,Activity sites,CoSex,Electrodeposition technique,Sulfur doping,NiSex
更新于2025-09-11 14:15:04