X-ray Photoelectron Spectroscopy and Resonant X-ray Spectroscopy Investigations of Interactions between Thin Metal Catalyst Films and Amorphous Titanium Dioxide Photoelectrode Protection Layers
Source abstract
Abstract
The use of electrochemistry, X-ray photoelectron spectroscopy, and resonant X-ray spectroscopy has unlocked the paradox of interfacial hole conduction through amorphous TiO2 (a-TiO2) to deposited Ni, Ir, and Au metal catalysts. Although electrocatalysts for the oxygen-evolution reaction derived from metallic Ir and Ni have mutually similar overpotentials in alkaline media, Si/a-TiO2/Ir interfaces exhibit higher overpotentials than Si/a-TiO2/Ni interfaces. The data allow formulation of full band energy diagrams for n-Si/a-TiO2/metal interfaces for M = Ni, Ir, or Au. Although both Ni and Ir produce band bending in a-TiO2 favoring hole conduction, only Ni creates multiple states within the a-TiO2 band gap at the a-TiO2/Ni interface, which produces a quasi-metallic interface at the a-TiO2/Ni junction. Au, however, produces a flat-band interface that limits hole conduction without any new band gap states.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Copper-based nanomaterials and applications · Semiconductor materials and devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
Department of Applied Physics and Material Science, California Institute of Technology, Pasadena, California 91125, United States
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
Kavli Nanoscience Institute, California Institute of Technology, Pasadena, California 91125, United States
BTU Cottbus, Applied Physics, Konrad-Wachsmann-Allee 17, Cottbus 03046, Germany
Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States
Funding
Basic Energy Sciences · U.S. Department of Energy
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