Nanostructured hematite for photoelectrochemical generation of hydrogen

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• 作者：Vibha R. Satsangi ; Saroj Kumari ; Aadesh P. Singh ; Rohit Shrivastav ; Sahab Dass
• 关键词：Hematite ; Photoelectrochemical ; Spray pyrolysis ; Hydrogen ; Swift heavy ion irradiation
• 刊名：International Journal of Hydrogen Energy
• 出版年：2008
• 出版时间：January 2008
• 年：2008
• 卷：33
• 期：1
• 页码：312-318
• 全文大小：426 K

文摘

With the advent of nanotechnology there has been a resurge of interest in α-Fe₂O₃, as suitable candidate for photoelectrochemical (PEC) splitting of water to generate hydrogen. This paper describes the enhanced PEC behaviour of nanostructured α-Fe₂O₃ thin films modified by various techniques. Nanostructured thin film/pellets of α-Fe₂O₃ prepared by various techniques and various dopants were investigated for their photoelectrochemical response. Thin films prepared by spray pyrolysis having particle size of 20–30 nm exhibited better photoresponse as compared to the films prepared by sol–gel methods, which further improved on doping with Zn. These films were further modified by (i) depositing Zn dots on the surface of α-Fe₂O₃ films using thermal evaporation method and (ii) irradiating it with 170 MeV Au¹³⁺ ions. When used as electrode in photoelectrochemical cell, a significant increase in the photoresponse of these modified films were observed, details of which are discussed.