Highly Dispersed FeS@S-doped Graphene Oxide as High-Performance Cathode Catalysts for Green Solar Energy Utilization:Fast Interfacial Electronic Exchange
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- 英文论文题名：Highly Dispersed FeS@S-doped Graphene Oxide as High-Performance Cathode Catalysts for Green Solar Energy Utilization:Fast Interfacial Electronic Exchange
- 论文作者：李月强 ; 尹杰 ; 张宪玺 ; 周华伟 ; 王术皓
- 年：2017
- 作者机构：聊城大学化学化工学院山东省化学储能与新型电池技术重点实验室;聊城大学材料与工程学院;
- 英文论文关键词：FeS@S-doped Graphene Oxide ; Catalysts ; Solar Cell
- 会议召开时间：2017-05-27
- 会议录名称：第四届新型太阳能电池学术研讨会论文集
- 英文会议录名称：Abstract Book of the 4th Conference on New Generation Solar Cells
- 语种：英文
- 分类号：TM914.4
- 学会代码：ZKYQ
- 会议名称：第四届新型太阳能电池学术研讨会
- 会议地点：中国北京
- 主办单位：中国可再生能源学会光化学专业委员会
- 学会名称：中国科学院物理研究所清洁能源实验室
- 页数：1
- 文件大小：754k
- 原文格式：D
- 会议级别：全国
摘要
In the process of conversion of solar energy into electricity and fuel cells, efficient electrocatalysts are indispensable.Rieske Iron Sulfur protein and FeS play important role in natural photosynthesis(NPS), and in artificial photoelectrochemical cells, respectively.However, solar-to-electrical energy conversion efficiency of photoelectrochemical cell based FeS is very low.Herein, we prepared a nano-micro composite(NMC) of highly dispersed FeS nanoparticles fixed on sulfur-doped graphene oxide(S-GO) sheets(namely, FeS@S-GO-NMC) to be used as cathode in dye-sensitized solar cells(DSCs).Notably, DSCs based on FeS@S-GO-NMC cathode achieved a high solar-to-electrical conversion efficiency up to 7.23%.This value is, to the best of our knowledge, the highest energy conversion efficiency reported for a photoelectrochemical cell based on FeS material.Although the FeS@S-GO-NMC exhibited low thermodynamics possibility for the redox reactions, it showed higher kinetic rate than of Pt for the charge transfer between the reaction medium and the cathode.This indicates that a fast electronic exchange process occurs at the interface between reaction and cathode.The value of time constant(τ)corresponding to the charge exchange resistance based on FeS@S-GO –NMC(0.0215 ms) was smaller than that obtained with Pt(0.261 ms).Therefore, we ascribed the superior performance of photoelectrochemical device based on FeS@S-GO –NMC to the good electrocatalytic performance, rather than the properties of the photocathode in tandem DSC.Results are of great interest for fundamental research and practical applications of FeS in solar splitting-water, artificial photoelectrochemical cells, electrocatalysts and Li-S or Na-S batteries.
In the process of conversion of solar energy into electricity and fuel cells, efficient electrocatalysts are indispensable.Rieske Iron Sulfur protein and FeS play important role in natural photosynthesis(NPS), and in artificial photoelectrochemical cells, respectively.However, solar-to-electrical energy conversion efficiency of photoelectrochemical cell based FeS is very low.Herein, we prepared a nano-micro composite(NMC) of highly dispersed FeS nanoparticles fixed on sulfur-doped graphene oxide(S-GO) sheets(namely, FeS@S-GO-NMC) to be used as cathode in dye-sensitized solar cells(DSCs).Notably, DSCs based on FeS@S-GO-NMC cathode achieved a high solar-to-electrical conversion efficiency up to 7.23%.This value is, to the best of our knowledge, the highest energy conversion efficiency reported for a photoelectrochemical cell based on FeS material.Although the FeS@S-GO-NMC exhibited low thermodynamics possibility for the redox reactions, it showed higher kinetic rate than of Pt for the charge transfer between the reaction medium and the cathode.This indicates that a fast electronic exchange process occurs at the interface between reaction and cathode.The value of time constant(τ)corresponding to the charge exchange resistance based on FeS@S-GO –NMC(0.0215 ms) was smaller than that obtained with Pt(0.261 ms).Therefore, we ascribed the superior performance of photoelectrochemical device based on FeS@S-GO –NMC to the good electrocatalytic performance, rather than the properties of the photocathode in tandem DSC.Results are of great interest for fundamental research and practical applications of FeS in solar splitting-water, artificial photoelectrochemical cells, electrocatalysts and Li-S or Na-S batteries.
In the process of conversion of solar energy into electricity and fuel cells, efficient electrocatalysts are indispensable.Rieske Iron Sulfur protein and FeS play important role in natural photosynthesis(NPS), and in artificial photoelectrochemical cells, respectively.However, solar-to-electrical energy conversion efficiency of photoelectrochemical cell based FeS is very low.Herein, we prepared a nano-micro composite(NMC) of highly dispersed FeS nanoparticles fixed on sulfur-doped graphene oxide(S-GO) sheets(namely, FeS@S-GO-NMC) to be used as cathode in dye-sensitized solar cells(DSCs).Notably, DSCs based on FeS@S-GO-NMC cathode achieved a high solar-to-electrical conversion efficiency up to 7.23%.This value is, to the best of our knowledge, the highest energy conversion efficiency reported for a photoelectrochemical cell based on FeS material.Although the FeS@S-GO-NMC exhibited low thermodynamics possibility for the redox reactions, it showed higher kinetic rate than of Pt for the charge transfer between the reaction medium and the cathode.This indicates that a fast electronic exchange process occurs at the interface between reaction and cathode.The value of time constant(τ)corresponding to the charge exchange resistance based on FeS@S-GO –NMC(0.0215 ms) was smaller than that obtained with Pt(0.261 ms).Therefore, we ascribed the superior performance of photoelectrochemical device based on FeS@S-GO –NMC to the good electrocatalytic performance, rather than the properties of the photocathode in tandem DSC.Results are of great interest for fundamental research and practical applications of FeS in solar splitting-water, artificial photoelectrochemical cells, electrocatalysts and Li-S or Na-S batteries.
引文
[1]Huawei Zhou,Jie Yin*,Xianxi Zhang*,Zhaojin Yang,Dongjie Li,Junhu Wang,Xin Liu,Changzi Jin,Tingli Ma,Earth-abundant and Nano-micro composite catalysts of Fe3O4@Reduced Graphene Oxide for Green and Economical Mesoscopic Photovoltaics with High Efficiencies up to 9%,Journal of Materials Chemistry A,2016,4,67-73.