Journal Article

FZJ-2018-00355

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Direct Mapping of Band Positions in Doped and Undoped Hematite during Photoelectrochemical Water Splitting

Shavorskiy, A. ; Ye, X. ; Karslıoğlu, O. ; Poletayev, A. D. ; Hartl, M. ; Zegkinoglou, I. ; Trotochaud, L. ; Nemšák, S.FZJ* ; Schneider, C. M.FZJ* ; Crumlin, E. J. ; Axnanda, S. ; Liu, Z. ; Ross, P. N. ; Chueh, W. ; Bluhm, H. (Corresponding author)FZJ*

2017
ACS Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.jpclett.7b02548

Abstract: Photoelectrochemical water splitting is a promising pathway for the direct conversion of renewable solar energy to easy to store and use chemical energy. The performance of a photoelectrochemical device is determined in large part by the heterogeneous interface between the photoanode and the electrolyte, which we here characterize directly under operating conditions using interface-specific probes. Utilizing X-ray photoelectron spectroscopy as a noncontact probe of local electrical potentials, we demonstrate direct measurements of the band alignment at the semiconductor/electrolyte interface of an operating hematite/KOH photoelectrochemical cell as a function of solar illumination, applied potential, and doping. We provide evidence for the absence of in-gap states in this system, which is contrary to previous measurements using indirect methods, and give a comprehensive description of shifts in the band positions and limiting processes during the photoelectrochemical reaction.

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Contributing Institute(s):

1. Elektronische Eigenschaften (PGI-6)
2. JARA Institut Quanteninformation (PGI-11)

Research Program(s):

1. 522 - Controlling Spin-Based Phenomena (POF3-522) (POF3-522)

Appears in the scientific report 2017

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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