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Study On Photoelectric Properties Of Dye-sensitized Solar Cells Based On Multi-alloy Counter Electrodes

Posted on:2021-01-29Degree:MasterType:Thesis
Country:ChinaCandidate:W JiangFull Text:PDF
GTID:2381330623483625Subject:Materials engineering
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Metal selenides and sulfides are widely used as counter-electrode materials for dye-sensitized solar cells?DSSC?due to their superior electrocatalytic activity and stability.In this thesis,binary Ru81.09Co18.91,Ru80.55Se19.45,Co20.85Se79.159.15 selenide were synthesized on the surface of FTO?SnO2:F?substrate by electrodeposition method,and ternary was synthesized on FTO surface by hydrothermal method The ternary sulfide NiRuS was synthesized on the surface of FTO by the electrodeposition method of NiCoSe and RuCoSe alloys.The effects of different chemical ratios of selenide/sulfide on the electrocatalytic activity of the electrode and the photoelectric conversion efficiency of the battery were systematically studied.Improved photoelectric efficiency was achieved by controllable preparation.A binary selenide alloy was prepared on the FTO substrate by electrodeposition method.The electrocatalytic activity and photoelectric conversion efficiency of different metal selenides on electrode materials were studied.The results show that the dye-sensitized battery of Co20.85Se79.159.15 selenide counter electrode has a photoelectric efficiency of 7.08%,which is 22%higher than the DSSC efficiency of metal Pt counter electrode by 5.80%.The excellent catalytic activity of binary Co20.85Se79.159.15 selenide on I3?is mainly attributed to the increase in the number of active sites for the adsorption of I3?ions in the electrolyte,the work function matching the I3?/I?redox couple,and the decreased impedance on the electrolyte?I3?/I??/counter electrode interface.A ternary selenide alloy was prepared on the FTO substrate by a hydrothermal method,and the synergistic effect and photoelectric conversion efficiency of the ternary metal selenide in the electrocatalytic reaction of the counter electrode were studied.The results show that compared with the binary selenides CoSe?6.79%?,NiSe?6.45%?,RuSe?5.51%?and metal Pt?6.53%?counter electrodes,the DSSC photoelectric efficiency of the ternary selenides NiCoSe and RuCoSe are improved to8.19%and 7.46%.The excellent electrocatalytic activity is mainly due to the synergistic effect of Ni?Ru?and Co atoms in the ternary selenide,the counter electrode interface enriched by free electrons,and the matched work function with I3?/I?redox couple,smaller counter electrode interface impedance.The ternary sulfide alloy was prepared on the FTO substrate by electrodeposition method.The performance of various metal sulfides in the electrocatalytic reaction of the counter electrode and the photoelectric conversion efficiency were studied.The results show that compared to the binary sulfide NiS?5.78%?,RuS?6.36%?and Pt?6.34%?counter electrodes,the DSSC of the ternary NiRuS sulfide counter electrode achieved a photoelectric efficiency of 6.96%.The improved electrocatalytic activity is mainly due to the enlarged active site of the ternary sulfide,the smaller counter electrode interface resistance,and the electron mobility.
Keywords/Search Tags:dye-sensitized solar cell, counter electrode, binary selenide, ternary selenide, ternary sulfide
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