000184456 001__ 184456
000184456 005__ 20181203023017.0
000184456 0247_ $$2doi$$a10.1021/jp304254k
000184456 022__ $$a1932-7447
000184456 02470 $$2ISI$$a000307494600008
000184456 037__ $$aARTICLE
000184456 245__ $$aDirect Observation of Two Electron Holes in a Hematite Photoanode during Photoelectrochemical Water Splitting
000184456 260__ $$aWashington$$bAmerican Chemical Society$$c2012
000184456 269__ $$a2012
000184456 300__ $$a6
000184456 336__ $$aJournal Articles
000184456 520__ $$aVisible light active photoelectrodes for hydrogen generation by solar photoelectrochemical water splitting have been under scrutiny for many decades. In particular, the role of electron holes and charge transfer remains controversial. We have investigated the oxygen evolution of hematite in alkaline aqueous electrolyte under a bias potential during visible light illumination in a photoelectrochemical cell operando with soft X-ray (O 1s) spectroscopy. Only under these conditions, two new spectral signatures evolve in the valence band, which we identify as an O 2p hole transition into the charge transfer band and an Fe 3d type hole into the upper Hubbard band. Quantitative analysis of their spectral weight and comparison with the photocurrent reveals that both types of holes, contrary to earlier speculations and common perception, contribute to the photocurrent.
000184456 700__ $$aBraun, Artur$$uEmpa Swiss Fed Labs Mat Sci & Technol, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland
000184456 700__ $$0244210$$aSivula, Kevin$$g178220$$uEcole Polytech Fed Lausanne, Lab Photon & Interfaces, CH-1015 Lausanne, Switzerland
000184456 700__ $$aBora, Debajeet K.$$uEmpa Swiss Fed Labs Mat Sci & Technol, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland
000184456 700__ $$aZhu, Junfa$$uUniv Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China
000184456 700__ $$aZhang, Liang$$uUniv Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China
000184456 700__ $$0240191$$aGraetzel, Michael$$g105292$$uEcole Polytech Fed Lausanne, Lab Photon & Interfaces, CH-1015 Lausanne, Switzerland
000184456 700__ $$aGuo, Jinghua
000184456 700__ $$aConstable, Edwin C.$$uUniv Basel, Dept Chem, CH-4056 Basel, Switzerland
000184456 773__ $$j116$$k32$$q16870-16875$$tJournal Of Physical Chemistry C
000184456 909C0 $$0252060$$pLPI$$xU10101
000184456 909CO $$ooai:infoscience.tind.io:184456$$pSB$$particle
000184456 917Z8 $$x105528
000184456 937__ $$aEPFL-ARTICLE-184456
000184456 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000184456 980__ $$aARTICLE