title: High-Resolution Analysis of Photoanodes for Water Splitting by Means of Scanning Photoelectrochemical Microscopy.
abstract: In pursuance of efficient tools for the local analysis and characterization of novel photoelectrocatalytic materials, several SECM-based techniques have been developed, aiming on the combined benefit of a local irradiation of the analyzed sample and a microelectrode probe for the localized electrochemical analysis of the surface. We present the development and application of scanning photoelectrochemical microscopy (SPECM) for the laterally resolved characterization of photoelectrocatalytic materials. Particularly, the system was developed for the photoelectrochemical characterization of n-type semiconductor-based photoanodes for water splitting. By using the tip microelectrode simultaneously for local irradiation and as an electrochemical probe, SPECM was capable to simultaneously provide information about the local photocurrent generated at the sample under irradiation and to detect the photoelectrocatalytically evolved oxygen at the microelectrode. In combination with a novel means of irradiation of the interrogated sample, local analysis of semiconductor materials for light-induced water splitting with improved lateral resolution is achieved.
authors.affiliation: Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum , Universitätsstrasse 150, D-44780 Bochum, Germany.
authors.forename: Felipe
authors.identifier: 0000-0002-3316-2642
authors.initials: F
authors.lastname: Conzuelo
authors.affiliation: Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum , Universitätsstrasse 150, D-44780 Bochum, Germany.
authors.forename: Kirill
authors.initials: K
authors.lastname: Sliozberg
authors.affiliation: Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum , Universitätsstrasse 150, D-44780 Bochum, Germany.
authors.forename: Ramona
authors.initials: R
authors.lastname: Gutkowski
authors.affiliation: Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum , Universitätsstrasse 150, D-44780 Bochum, Germany.
authors.forename: Stefanie
authors.initials: S
authors.lastname: Grützke
authors.affiliation: Sensolytics GmbH , Universitätsstrasse 142, D-44799 Bochum, Germany.
authors.forename: Michaela
authors.initials: M
authors.lastname: Nebel
authors.affiliation: Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum , Universitätsstrasse 150, D-44780 Bochum, Germany.
authors.forename: Wolfgang
authors.identifier: 0000-0003-2916-5223
authors.initials: W
authors.lastname: Schuhmann