Regensburg 2016 – scientific program

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O: Fachverband Oberflächenphysik

O 82: Structure of Solid/Liquid Interfaces I

O 82.2: Talk

Thursday, March 10, 2016, 10:45–11:00, H6

An Electrochemical, resonant Photoemission and Ambient Pressure-X-ray Photoelectron Spectroscopic Investigation of Si/TiO2/Ni/Electrolyte Interfaces — •Matthias H. Richter1,2,7, Michael F. Lichterman1,2, Shu Hu1,2, Ethan J. Crumlin3, Stephanus Axnanda3, Marco Favaro3,4, Walter Drisdell3,4, Zahid Hussain3, Bruce S. Brunschwig1, Zhi Liu3,5,6, Nathan S. Lewis1,2, and Hans-Joachim Lewerenz1,21Caltech, Pasadena, USA. — 2Joint Center for Artificial Photosynthesis, Pasadena, USA. — 3Lawrence Berkeley National Laboratory, Berkeley, USA. — 4Joint Center for Artificial Photosynthesis, Berkeley, USA. — 5Chinese Academy of Sciences, China. — 6ShanghaiTech University, China. — 7BTU C-S, Cottbus, Germany.

Photoelectrochemical cells based on semiconductor-liquid interfaces provide a method of converting solar energy to electricity or fuels. Recently, we have demonstrated operational systems that involved stabilized semiconductor-liquid junctions [1]. The electrical and spectroscopic properties of the TiO2/Ni protection layer system have been investigated in contact with electrolyte solutions [2, 3, 4]. From the response of the photoelectron binding energies to variations in applied potential the energetics of the solid/electrolyte interface are elucidated. The degree of conductivity depended on the chemical state of the Ni on the TiO2 surface. The combinations of these techniques provide a powerful tool for the investigation of hybrid electrode/solution contacts. [1] Science 344 (2014) 1005; [2] Sci Rep 5 (2015) 9788; [3] Ener & Env Sci 8 (2015) 2409; [4] J Electrochem Soc 162 (2016) H1

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