材料科学
光电流
三氧化钨
分解水
阳极
基质(水族馆)
光电化学电池
振膜(声学)
光电子学
电解质
化学工程
纳米技术
钨
光催化
电极
化学
冶金
电气工程
扬声器
催化作用
物理化学
工程类
生物化学
地质学
海洋学
作者
Teresa da Silva Lopes,Paula Dias,Luísa Andrade,Adélio Mendes
标识
DOI:10.1016/j.solmat.2014.05.051
摘要
A photoelectrochemical (PEC) device capable of splitting water into storable hydrogen fuel by the direct use of solar energy is becoming a very attractive technology since it is clean and sustainable. Indeed, real field experiments are being developed in order to assess technological issues for large-scale usage under outdoor conditions. Following the need for developing photoelectrochemical devices with an optimized design that allows reaching a commercial performance level, the present works describes an innovative PEC cell for testing different photoelectrodes configurations, suitable for continuous operation and for easily collect the evolved gases. Moreover, a porous Teflon® diaphragm useable for a wide range of aqueous electrolyte solutions is tested. Two semiconductors were investigated: tungsten trioxide and undoped hematite. The WO3 photoelectrodes were deposited in two different substrates: (i) anodized WO3 photoelectrodes on a metal substrate and (ii) WO3 deposited by blade spreading method on a TCO glass substrate. The undoped-Fe2O3 photoanode was deposited by ultrasonic spray pyrolysis technique in a TCO glass substrate. The material deposited on glass substrates allows to obtain transparent photoelectrodes. Photocurrent–voltage characteristics were obtained for all samples characterized under three different conditions: (i) no membrane separating the anode and the cathode evolution; (ii) using a Teflon® diaphragm and (iii) using a Nafion® 212 membrane. The transparent samples (photoanodes deposited on glass substrates) produced the highest values of photocurrent when the Teflon® diaphragm was used. This photocurrent enhancement was assigned to the high reflectance showed by the diaphragm, which reflects back a significant fraction of the transmitted solar radiation.
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