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Shavorskiy A, Ye X, Karslıoğlu O, et al. Direct Mapping of Band Positions in Doped and Undoped Hematite during Photoelectrochemical Water Splitting. J Phys Chem Lett. 2017;8(22):5579-5586doi: 10.1021/acs.jpclett.7b02548.
Shavorskiy, A., Ye, X., Karslıoğlu, O., Poletayev, A. D., Hartl, M., Zegkinoglou, I., Trotochaud, L., Nemšák, S., Schneider, C. M., Crumlin, E. J., Axnanda, S., Liu, Z., Ross, P. N., Chueh, W., & Bluhm, H. (2017). Direct Mapping of Band Positions in Doped and Undoped Hematite during Photoelectrochemical Water Splitting. The journal of physical chemistry letters, 8(22), 5579-5586. https://doi.org/10.1021/acs.jpclett.7b02548
Shavorskiy, Andrey, et al. "Direct Mapping of Band Positions in Doped and Undoped Hematite during Photoelectrochemical Water Splitting." The journal of physical chemistry letters vol. 8,22 (2017): 5579-5586. doi: https://doi.org/10.1021/acs.jpclett.7b02548
Shavorskiy A, Ye X, Karslıoğlu O, Poletayev AD, Hartl M, Zegkinoglou I, Trotochaud L, Nemšák S, Schneider CM, Crumlin EJ, Axnanda S, Liu Z, Ross PN, Chueh W, Bluhm H. Direct Mapping of Band Positions in Doped and Undoped Hematite during Photoelectrochemical Water Splitting. J Phys Chem Lett. 2017 Nov 16;8(22):5579-5586. doi: 10.1021/acs.jpclett.7b02548. Epub 2017 Nov 02. PMID: 29083905.
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J Phys Chem Lett. 2017 Nov 16;8(22):5579-5586. doi: 10.1021/acs.jpclett.7b02548. Epub 2017 Nov 02.

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

The journal of physical chemistry letters

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

Affiliations

  1. Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
  2. Material Science and Engineering Division, Stanford University , Stanford, California 94305, United States.
  3. Peter-Grünberg-Institut-6, Forschungszentrum Jülich , 52425 Jülich, Germany.
  4. Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
  5. Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.

PMID: 29083905 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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