Acid Treatment Enables Suppression of Electron–Hole Recombination in Hematite for Photoelectrochemical Water Splitting. (5th February 2016)

• Record Type: Journal Article
• Authors: Yang, Yi; Forster, Mark; Ling, Yichuan; Wang, Gongming; Zhai, Teng; Tong, Yexiang; Cowan, Alexander J.; Li, Yat
• Is Part Of: Angewandte Chemie. Volume 128:Number 10(2016)
• Page Start: 3464
• Page End: 3468
• Publication Date: 2016-02-05
• Subjects: Hämatit -- Metalloxide -- Photoelektrochemische Wasserspaltung -- Säurebehandlung -- Transiente Absorptionsspektroskopie; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201510869
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: We report a strategy for efficient suppression of electron–hole recombination in hematite photoanodes. Acid‐treated hematite showed a substantially enhanced photocurrent density compared to untreated samples. Electrochemical impedance spectroscopy studies revealed that the enhanced photocurrent is partly due to improved efficiency of charge separation. Transient absorption spectroscopic studies coupled to electrochemical measurements indicate that, in addition to improved bulk electrochemical properties, acid‐treated hematite has significantly decreased surface electron–hole recombination losses owing to a greater yield of the trapped photoelectrons being extracted to the external circuit.