Nitrogen-Doped In2O3 Thin Film Electrodes for Photocatalytic Water Splitting

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• 作者：Karla R. Reyes-Gil ; Enrique A. Reyes-Garcí ; a ; Daniel Raftery
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：October 4, 2007
• 年：2007
• 卷：111
• 期：39
• 页码：14579 - 14588
• 全文大小：615K
• 年卷期：v.111,no.39(October 4, 2007)
• ISSN：1932-7455

文摘

New visible-light photocatalysts were prepared by doping In₂O₃ with nitrogen from ethylenediamine(NH₂(CH₂)₂NH₂) or ammonium chloride (NH₄Cl) as the nitrogen source. Nitrogen-doped In₂O₃ powder preparedfrom NH₂(CH₂)₂NH₂ shows a rhombic structure and a substitutional N-doping, while the powder preparedfrom NH₄Cl shows a cubic structure and NH_x in interstitial sites. N-doping extended the light absorption ofIn₂O₃ to the visible region ( < ~650 nm), narrowing the band gap from 3.5 eV to approximately 2.0 eV.The photocurrent densities of N-doped In₂O₃ electrodes are at least double those of undoped In₂O₃ andapproximately 50 times better than N-doped TiO₂ electrodes in the visible region, although optimization willbe needed to deliver high photocurrents. This present work shows that In₂O₃ can be suitably doped to producea promising photocatalyst with improved photoelectrochemical properties for solar hydrogen conversionapplications.