Polyoxometalate-Based Sensitizers for p-Type Dye-Sensitized Solar Cells

用于 p 型染料敏化太阳能电池的多金属氧酸盐敏化剂

• 批准号: EP/M00452X/1
• 负责人: John Fielden
• 金额: $ 12.57万
• 依托单位: University of East Anglia
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2014
• 资助国家: 英国
• 起止时间: 2014 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FM00452X%2F1
• 关键词: Polyoxometalate; Based; Sensitizers; Type; Dye

Photonic materials interact with light in interesting and useful ways. They are vital to many current and emerging technologies, such as biological imaging, optical data processing, telecommunications and solar energy. This project will investigate the properties of a promising, but little explored class of photonic materials and test them as a means to improve the performance of an emerging type of solar cell - the p-type dye sensitized photocathode (p-DSSC). In this way, our long-term goal is to develop low cost, high-efficiency solar energy devices which will help reduce carbon emissions and dependence on imported fossil fuels. Dye-sensitized solar cells (DSSCs), based on a dye-sensitized n-type titanium dioxide photoanode, promise a low-cost alternative to conventional semiconductor photovoltaic (PV) materials like silicon. They function well in northern-European, low-light conditions but their peak power conversion lags far behind that of the best semiconductor designs, which combine several different semiconductors optimized to absorb different portions of the solar spectrum. DSSC performance may be improved through an analogous approach - tandem DSSCs which pair the usual dye-sensitized photoanode (n-DSSC) with a dye-sensitized photocathode (p-DSSC). With complementary absorption profiles, the n- and p-DSSCs absorb more sunlight together in the tandem DSSC than either can alone. Currently, though, the efficiency of the p-DSSC (record 1.3%) is far from matching that of n-DSSCs (10 to 15%). This means that tandem DSSCs perform worse than n-DSSCs by themselves, and p-DSSCs must improve dramatically for the tandem DSSC to become a viable device.Both n- and p-DSSCs depend on efficient charge separation at the interface between a dye and a metal oxide support to generate electricity. n-DSSCs achieve useful efficiencies because light causes the dyes to rapidly inject electrons into an n-type (electron transporting) metal oxide. Transport of electrons through the metal oxide, and filling of "holes" formed in the dyes by electrons from a redox electrolyte, is much faster than recombination (return of electrons) to the dye from the metal oxide. p-DSSCs work in the opposite sense, injecting holes into a p-type (hole transporting) metal oxide, with the redox electrolyte taking electrons from the dyes. The problem for p-DSSCs is that transport of holes through oxides is slow, and recombination from the dye and electrolyte is fast. This leads to low efficiency.In this project, we will synthesize a novel class of dye for the p-DSSC, based on connection of electron accepting multi-metallic clusters (polyoxometalates, POMs) to organic groups. By holding electrons away from the metal oxide surface, the POM electron acceptor groups will slow recombination and improve performance. The proposed POM-based sensitizers have an electronic structure that will favour charge separation, and are expected to have important advantages - in stability and ability to rapidly transfer electrons to the redox electrolyte - over the current purely organic materials.

光子材料以有趣且有用的方式与光相互作用。它们对于许多当前和新兴技术至关重要，例如生物成像，光学数据处理，电信和太阳能。该项目将研究有希望的有前途的特性，但很少探索的光子材料类别，并将其作为改善新兴类型的太阳能电池的性能的一种手段 - P型染料染料敏化光电座（PSSC）。这样，我们的长期目标是开发低成本，高效的太阳能设备，这将有助于减少碳排放量并依赖进口化石燃料。 染料敏化的太阳能电池（DSSC）基于染料敏化的N型二氧化钛光阳极，保证了传统半导体光伏（PV）材料（如硅）的低成本替代品。它们在北欧洲的低光条件下运作良好，但是它们的峰值功率转换远远落后于最佳半导体设计的峰值，它们结合了优化的几个不同的半导体，可吸收太阳光谱的不同部分。 DSSC性能可以通过类似的方法-TANDEM DSSC来提高，该方法将通常的染料敏化光阳极（N-DSSC）与染料敏化的光电座（PSSC）配对。借助互补的吸收曲线，N-和P-DSSC在串联DSSC中吸收更多的阳光，而不是单独吸收。但是，目前，P-DSSC的效率（创纪录的1.3％）远非与N-DSSC的效率（10％到15％）相匹配。这意味着串联DSSC的性能比N-DSSC本身要差，并且P-DSSC必须显着改进，以使串联DSSC成为可行的设备。n-和p-dsscs取决于在染料和金属氧化物之间的界面上有效的电荷分离，以产生电力。 N-DSSC达到有用的效率，因为光导致染料迅速将电子注入N型（电子传输）金属氧化物。电子通过金属氧化物的传输，并填充来自氧化还原电解质的电子在染料中形成的“孔”，比从金属氧化物中的重组（电子返回）到染料的速度要快得多。 P-DSSC的工作方式相反，将孔注入P型（孔传输）金属氧化物，氧化还原电解质从染料中取电子。 P-DSSC的问题在于，孔通过氧化物的运输很慢，染料和电解质的重组很快。这将导致低效率。在这个项目中，我们将基于电子接受多金属簇（多氧碱，POM）与有机基团的电子连接，将新型的染料用于P-DSSC。通过将电子远离金属氧化物表面，POM电子受体组将减慢重组并改善性能。提出的基于POM的敏化剂具有电子结构，该电子结构将有利于电荷分离，并且预计将在纯粹的有机材料上稳定和快速传递电子到氧化还原电解质的能力。

项目成果

Electrochemically-Switched 2nd Order Non-Linear Optical Response in an Arylimido-Polyoxometalate with High Contrast and Cyclability.

• DOI: 10.1002/anie.202215537
• 发表时间: 2023-01-26
• 期刊: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
• 影响因子: 16.6
• 作者: Hood, Bethany R. R.;de Coene, Yovan;Torre Do Vale Froes, Afonso V. V.;Jones, Claire F. F.;Beaujean, Pierre;Liegeois, Vincent;MacMillan, Fraser;Champagne, Benoit;Clays, Koen;Fielden, John
• 通讯作者: Fielden, John

Covalently Linked Polyoxometalate-Polypyrrole Hybrids: Electropolymer Materials with Dual-Mode Enhanced Capacitive Energy Storage

• DOI: 10.1021/acs.macromol.0c02354
• 发表时间: 2020-12-22
• 期刊: MACROMOLECULES
• 影响因子: 5.5
• 作者: Alshehri, Sarah A.;Al-Yasari, Ahmed;Fielden, John
• 通讯作者: Fielden, John

Electrochemically-Switched 2nd Order Non-Linear Optical Response in an Arylimido-Polyoxometalate with High Contrast and Cyclability

具有高对比度和可循环性的芳基酰亚胺多金属氧酸盐中的电化学切换二阶非线性光学响应

• DOI: 10.1002/ange.202215537
• 发表时间: 2022
• 期刊: Angewandte Chemie
• 作者: Hood B

Increasing p-type dye sensitised solar cell photovoltages using polyoxometalates.

• DOI: 10.1039/c7cp01558e
• 发表时间: 2017-07
• 期刊: Physical chemistry chemical physics : PCCP
• 作者: H. El Moll;Fiona A. Black;C. Wood;A. Al‐Yasari;A. Reddy Marri;I. Sazanovich;E. Gibson;J. Fielden-J.-Fi