In Situ Preparation of a Ti3+ Self‐Doped TiO2 Film with Enhanced Activity as Photoanode by N2H4 Reduction1. (1st August 2014)

• Record Type: Journal Article
• Authors: Mao, Chengyu; Zuo, Fan; Hou, Yang; Bu, Xianhui; Feng, Pingyun
• Is Part Of: Angewandte Chemie. Volume 126:Number 39(2014)
• Page Start: 10653
• Page End: 10657
• Publication Date: 2014-08-01
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201406017
• Languages: English
• ISSNs: 0044-8249

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>A new synthetic method to fabricate Ti³⁺‐modified, highly stable TiO₂ photoanodes for H₂O oxidation is reported. With Ti foil as both the conducting substrate and the Ti³⁺/Ti⁴⁺ source, one‐dimensional blue Ti³⁺/TiO₂ crystals were grown by a one‐step hydrothermal reaction. The concentration of Ti³⁺ was further tuned by N₂H₄ reduction, leading to a greater photoelectrocatalytic activity, as evidenced by a high photocurrent density of 0.64 mA cm⁻² at 1.0 V vs RHE under simulated AM 1.5 G illumination. Electron paramagnetic resonance and Mott–Schottky plots reveal that higher charge‐carrier density owing to N₂H₄ reduction contributes to the observed improvement. The generality of this synthesis method was demonstrated by its effectiveness in improving the performance of other types of photoanodes. By integrating the advantages of the 1D TiO₂ architecture with those of Ti³⁺ self‐doping, this work provides a versatile tool toward the fabrication of efficient TiO₂ photoanodes.</p> </abstract>