Abstract:As células solares de TiO 2 /corante são uma alternativa promissora para o desenvolvimento de uma nova geração de dispositivos fotovoltaicos. Estas células resultam de uma bem sucedida combinação de materiais: um eletrodo transparente revestido com um filme poroso de partículas nanocristalinas de TiO 2 sensibilizadas com um corante, um eletrólito contendo um par redox adequado e um contra-eletrodo revestido com platina. Em geral, utilizam-se complexos bipiridínicos de Ru como corantes fotosensibilizadores. O d… Show more
“…Antes de iniciar a reação verifica-se a vedação de todas as conexões e se todo sistema está isento de umidade. Com auxílio do funil de adição inicia-se a lenta adição do HCl ao kitasato contendo MnO 2 4 e dissolução em 15 mL de metanol num Becker de 100 mL. Para auxiliar na dissolução usa-se aquecimento suave com o auxílio de um banho-maria e, caso haja a formação de gel, deve-se filtrar a solução usando um funil de vidro sinterizado.…”
Section: Síntese Do Snclunclassified
“…Nos laboratórios de pesquisa estes eletrodos são usados para depositar filmes finos de materiais eletrocrômicos e estudá-los por técnicas espectrofotométricas acopladas a técnicas eletroquímicas como, por exemplo, espectrocronoamperometria 1 . Estes eletrodos também são usados extensivamente para construir células fotoeletroquímicas de óxido de titânio sensibilizado por corantes [2][3][4] .…”
Recebido em 5/1/04; aceito em 24/8/04; publicado na web em 17/2/05 PREPARATION OF OPTICALLY TRANSPARENT ELECTRODES. A simple experiment for the preparation of transparent conducting glass electrodes by deposition of pure and fluorine doped SnO 2 films is described. This procedure was tested in the undergraduate inorganic course at IQ-UNICAMP. The success in achieving a conducting layer was easily checked using the standard probes of a volt-ohm meter. The optical transmittance and thickness were studied by UV-vis spectrophotometry. To discuss the experimental results we place significant emphasis on molecular orbital and energy band model theories. The undergraduate students can also discuss the concepts related to the electronic properties of solids and to interesting new materials, such as transparent conducting films, which are the subject of significant current research and technological applications.
“…Antes de iniciar a reação verifica-se a vedação de todas as conexões e se todo sistema está isento de umidade. Com auxílio do funil de adição inicia-se a lenta adição do HCl ao kitasato contendo MnO 2 4 e dissolução em 15 mL de metanol num Becker de 100 mL. Para auxiliar na dissolução usa-se aquecimento suave com o auxílio de um banho-maria e, caso haja a formação de gel, deve-se filtrar a solução usando um funil de vidro sinterizado.…”
Section: Síntese Do Snclunclassified
“…Nos laboratórios de pesquisa estes eletrodos são usados para depositar filmes finos de materiais eletrocrômicos e estudá-los por técnicas espectrofotométricas acopladas a técnicas eletroquímicas como, por exemplo, espectrocronoamperometria 1 . Estes eletrodos também são usados extensivamente para construir células fotoeletroquímicas de óxido de titânio sensibilizado por corantes [2][3][4] .…”
Recebido em 5/1/04; aceito em 24/8/04; publicado na web em 17/2/05 PREPARATION OF OPTICALLY TRANSPARENT ELECTRODES. A simple experiment for the preparation of transparent conducting glass electrodes by deposition of pure and fluorine doped SnO 2 films is described. This procedure was tested in the undergraduate inorganic course at IQ-UNICAMP. The success in achieving a conducting layer was easily checked using the standard probes of a volt-ohm meter. The optical transmittance and thickness were studied by UV-vis spectrophotometry. To discuss the experimental results we place significant emphasis on molecular orbital and energy band model theories. The undergraduate students can also discuss the concepts related to the electronic properties of solids and to interesting new materials, such as transparent conducting films, which are the subject of significant current research and technological applications.
“…The color of the device can be easily varied by the choice of dye [67][68][69][70][71][72][73][74][75]. The chemical and physical composition and structure of electrolyte mainly effects on the stability and solar energy conversion efficiency of the DSSC [49][50][51][52][53][54][55].…”
Section: Fabrication Of a Dsscmentioning
confidence: 99%
“…Although the highest conversion efficiency has been achieved by using liquid electrolytes due to the stability problems generate mainly from the leakage of electrolyte, quasi gel electrolytes are introduced. However this kind of electrolytes could not solve the stability problem and also caused efficiency reductions generating from the low ionic mobility and trapping of the gel in the metal oxide pores [53][54][55][56]. The next proposed alternative is solid polymer electrolytes in which polyether's and biopolymer-salt complexes are playing the dominant role [76][77][78][79][80][81][82][83][84][85][86][87][88][105][106][107][108][109].…”
a b s t r a c tPhotovoltaic technologies represent one of the leading research areas of solar energy which is one of the most powerful renewable alternatives of fossil fuels. In a common photovoltaic application the batteries play a key role in storage of energy generated by solar panels. Although it will take time for dye sensitized solar cells (DSSCs) and batteries based on biopolymer electrolytes to take their places in the market, laboratory studies prove that they have a lot to offer. Most efficient DSSCs and batteries available in market are based on liquid electrolytes. The advantages of liquid electrolytes are having high conductivity and good electrode-electrolyte interface whereas, disadvantages like corrosion and evaporation limit their future sustainability. Biopolymer electrolytes are proposed as novel alternatives which may overcome the problems stated above. In this review, we focus on fabrication, working principle as well as up to date status of DSSCs and batteries using biopolymer electrolytes. The effects of structural and electrical properties of biopolymer based electrolytes on the solar energy conversion efficiencies of DSSCs and their compatibility with lithium or other salts in battery applications are summarized. Biopolymer electrolyte based DSSCs are categorized on the basis of types of additives and recent outcomes of author's laboratory studies on biopolymer electrolyte based DSSCs and batteries are also presented.
“…The goal of our work is to conduct the science required toward the design of a material coating system which can be applied on site by skilled labor that will generate electricity for a fraction of current PV cost. The technology of focus is the dye sensitized solar cell (DSSC), a hybrid organic/inorganic device with proven efficiencies of 10%, and estimated costs at just 10 to 20% of state of the art silicon devices [1][2][3]. The DSSC is a 3 rd generation PV just beginning commercialization [4][5].…”
A critical component of the dye sensitized solar cell (DSSC) is the nano-structured wide bandgap semiconductor (typically TiO 2 ). The particle size, crystal structure, orientation, and scale of interconnected porosity are all critical to cell performance. In our lab, we have engineered and produced ceramic pastes including a hierarchy of nano-to micron-sized particles of varying morphologies and texture which yield novel, hybrid microstructures. We assert that while the nano-material provides the surface area, the micro particles provide conduits for easier diffusion of photo-generated electrons through the titania and also a pore structure for percolation of dye and electrolyte, giving enhanced photo-current and power output. The pastes also are of practical benefit, as they avoid shrinkage cracks during drying, and result in high quality thick films.
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