Direct Mapping of Band Positions in Doped and Undoped Hematite during Photoelectrochemical Water Splitting

Shavorskiy, Andrey; Ye, Xiaofei; Karslgolu, Osman; Poletayev, Andrey D.; Hartl, Matthias; Zegkinoglou, Ioannis; Trotochaud, Lena; Nemsak, Slavomir; Schneider, Claus M.; Crumlin, Ethan J.; Axnanda, Stephanus; Liu, Zhi; Ross, Philip N.; Chueh, William; Bluhm, Hendrik

doi:10.1021/acs.jpclett.7b02548

Title: Direct Mapping of Band Positions in Doped and Undoped Hematite during Photoelectrochemical Water Splitting

Journal Article · 30 October 2017 · Journal of Physical Chemistry Letters

DOI: https://doi.org/10.1021/acs.jpclett.7b02548 · OSTI ID:1440006

Shavorskiy, Andrey ^[1]; Ye, Xiaofei ^[2]; Karslgolu, Osman ^[1]; Poletayev, Andrey D. ^[2]; Hartl, Matthias ^[1]; Zegkinoglou, Ioannis ^[1];

^[1];

^[3];

^[4]; Axnanda, Stephanus ^[4];

^[4]; Ross, Philip N. ^[5];

^[2];

^[6]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
Stanford Univ., CA (United States). Material Science and Engineering Division
Forschungszentrum Julich (Germany). Peter-Grunberg-Inst.
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

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. Here, 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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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1440006

Journal Information:: Journal of Physical Chemistry Letters, Vol. 8, Issue 22; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Direct Mapping of Band Positions in Doped and Undoped Hematite during Photoelectrochemical Water Splitting

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