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000842074 1001_ $$0P:(DE-HGF)0$$aShavorskiy, Andrey$$b0
000842074 245__ $$aDirect Mapping of Band Positions in Doped and Undoped Hematite during Photoelectrochemical Water Splitting
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000842074 520__ $$aPhotoelectrochemical water splitting is a promising pathway for the direct conversion of renewable solar energy to easy to store and use chemical energy. The performance of a photoelectrochemical device is determined in large part by the heterogeneous interface between the photoanode and the electrolyte, which we here characterize directly under operating conditions using interface-specific probes. Utilizing X-ray photoelectron spectroscopy as a noncontact probe of local electrical potentials, we demonstrate direct measurements of the band alignment at the semiconductor/electrolyte interface of an operating hematite/KOH photoelectrochemical cell as a function of solar illumination, applied potential, and doping. We provide evidence for the absence of in-gap states in this system, which is contrary to previous measurements using indirect methods, and give a comprehensive description of shifts in the band positions and limiting processes during the photoelectrochemical reaction.
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000842074 7001_ $$0P:(DE-HGF)0$$aYe, Xiaofei$$b1
000842074 7001_ $$0P:(DE-HGF)0$$aKarslıoğlu, Osman$$b2
000842074 7001_ $$0P:(DE-HGF)0$$aPoletayev, Andrey D.$$b3
000842074 7001_ $$0P:(DE-HGF)0$$aHartl, Matthias$$b4
000842074 7001_ $$0P:(DE-HGF)0$$aZegkinoglou, Ioannis$$b5
000842074 7001_ $$00000-0002-8816-3781$$aTrotochaud, Lena$$b6
000842074 7001_ $$0P:(DE-Juel1)164137$$aNemšák, Slavomir$$b7
000842074 7001_ $$0P:(DE-Juel1)130948$$aSchneider, Claus M.$$b8
000842074 7001_ $$00000-0003-3132-190X$$aCrumlin, Ethan J.$$b9
000842074 7001_ $$0P:(DE-HGF)0$$aAxnanda, Stephanus$$b10
000842074 7001_ $$00000-0002-8973-6561$$aLiu, Zhi$$b11
000842074 7001_ $$0P:(DE-HGF)0$$aRoss, Philip N.$$b12
000842074 7001_ $$00000-0002-7066-3470$$aChueh, William$$b13
000842074 7001_ $$0P:(DE-Juel1)172019$$aBluhm, Hendrik$$b14$$eCorresponding author$$ufzj
000842074 773__ $$0PERI:(DE-600)2522838-9$$a10.1021/acs.jpclett.7b02548$$gVol. 8, no. 22, p. 5579 - 5586$$n22$$p5579 - 5586$$tThe @journal of physical chemistry letters$$v8$$x1948-7185$$y2017
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