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Author(s): Tânia Lopes
Paula Dias
Luísa Andrade
Adélio Mendes
Title: An innovative photoelectrochemical lab device for solar water splitting
Issue Date: 2014
Abstract: A photoelectrochemical (PEC) device capable of splitting water into storable hydrogen fuel by the directuse of solar energy is becoming a very attractive technology since it is clean and sustainable. Indeed, realfield experiments are being developed in order to assess technological issues for large-scale usage underoutdoor conditions. Following the need for developing photoelectrochemical devices with an optimizeddesign that allows reaching a commercial performance level, the present works describes an innovativePEC cell for testing different photoelectrodes configurations, suitable for continuous operation and foreasily collect the evolved gases. Moreover, a porous Teflons diaphragm useable for a wide range ofaqueous electrolyte solutions is tested. Two semiconductors were investigated: tungsten trioxide andundoped hematite. The WO3 photoelectrodes were deposited in two different substrates: (i) anodizedWO3 photoelectrodes on a metal substrate and (ii) WO3 deposited by blade spreading method on a TCOglass substrate. The undoped-Fe2O3 photoanode was deposited by ultrasonic spray pyrolysis techniquein a TCO glass substrate. The material deposited on glass substrates allows to obtain transparentphotoelectrodes. Photocurrent-voltage characteristics were obtained for all samples characterized underthree different conditions: (i) no membrane separating the anode and the cathode evolution; (ii) using aTeflons diaphragm and (iii) using a Nafions 212 membrane. The transparent samples (photoanodesdeposited on glass substrates) produced the highest values of photocurrent when the Teflonsdiaphragm was used. This photocurrent enhancement was assigned to the high reflectance showed bythe diaphragm, which reflects back a significant fraction of the transmitted solar radiation.
Subject: Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/COMISSÃO EUROPEIA/7.º Programa-Quadro de IDT/321315/Building Integrated Dye Sensitized Solar Cells/BI-DSC
info:eu-repo/grantAgreement/COMISSÃO EUROPEIA/7.º Programa-Quadro de IDT/227179 /Nanostructured photoelectrodes for energy conversion/NanoPEC
info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-EQU/107990/2008/Células fotoelectroquímicas para produção de hidrogénio a partir de energia solar/H2Solar
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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