Efficient Suppression of Electron–Hole Recombination in Oxygen-Deficient Hydrogen-Treated TiO2 Nanowires for Photoelectrochemical Water Splitting | Zendy

Federico M. Pesci | Zendy; Gongming Wang | Zendy; David R. Klug | Zendy; Yat Li | Zendy; Alexander J. Cowan | Zendy

Open Access

Efficient Suppression of Electron–Hole Recombination in Oxygen-Deficient Hydrogen-Treated TiO₂ Nanowires for Photoelectrochemical Water Splitting

Author(s) -

Federico M. Pesci,

Gongming Wang,

David R. Klug,

Yat Li,

Alexander J. Cowan

Publication year - 2013

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/jp4099914

Subject(s) - microsecond , water splitting , materials science , oxygen evolution , charge carrier , nanowire , recombination , hydrogen , photocatalysis , electron , optoelectronics , oxygen , carrier generation and recombination , absorption (acoustics) , photochemistry , ultrafast laser spectroscopy , chemical physics , chemistry , electrode , optics , electrochemistry , catalysis , physics , laser , semiconductor , biochemistry , organic chemistry , quantum mechanics , composite material , gene

There is an increasing level of interest in the use of black TiO 2 prepared by thermal hydrogen treatments (H:TiO 2 ) due to the potential to enhance both the photocatalytic and the light-harvesting properties of TiO 2 . Here, we examine oxygen-deficient H:TiO 2 nanotube arrays that have previously achieved very high solar-to-hydrogen (STH) efficiencies due to incident photon-to-current efficiency (IPCE) values of >90% for photoelectrochemical water splitting at only 0.4 V vs RHE under UV illumination. Our transient absorption (TA) mechanistic study provides strong evidence that the improved electrical properties of oxygen-deficient TiO 2 enables remarkably efficient spatial separation of electron-hole pairs on the submicrosecond time scale at moderate applied bias, and this coupled to effective suppression of microsecond to seconds charge carrier recombination is the primary factor behind the dramatically improved photoelectrochemical activity.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research