SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 107: Poster Session VIII: Poster to Mini-Symposium: Manipulation and control of spins on functional surfaces IV
O 107.7: Poster
Donnerstag, 4. März 2021, 13:30–15:30, P
Chiral cupric oxide layers as spin-polarizing water splitting catalysts — •Paul Möllers1, Daniel Nürenberg1, Koyel Banerjee Ghosh2, Wenyan Zhang2, Francesco Tassinari2, Yitzhak Mastai2, Ortal Lidor-Shalev2, Simon Wei3, Emil Wierzbinski3, David Waldeck3, Ron Naaman2, and Helmut Zacharias1 — 1Center for Soft Nanoscience, Westfälische Wilhelms- Universität, 48149 Münster, Germany — 2Department of Chemical and Biological Physics, Weizmann Institute of Science, 76100 Rehovot, Israel — 3Chemistry Department, University of Pittsburgh, Pittsburgh, PA 15260, United States
Spin-polarized catalytic surfaces can greatly enhance the selectivity of chemical reactions, e.g., in an electrocatalytic water splitting process. The spin polarization can be can be generated by the introduction of a chiral catalyst surface. [1,2] Here, we confirm that spin-polarized photocurrents can be obtained from chiral cupric oxide (CuO) films, and explore the underlying mechanism. Chiral CuO films were electrochemically deposited on polycrystalline gold substrates using a method pioneered by Switzer et al [3]. Photoelectrons were excited with laser pulses at 213 nm, and their average spin polarization was measured in a Mott scattering apparatus. The polarization exceeds P = +10 % for 20 nm thin CuO films with ’L’ chirality and, notably, is reversed for oxide films of opposite ’D’ chirality.
[1] S. Ghosh et al., J. Phys. Chem. C, 123, 3024-3031 (2019)
[2] K. B. Ghosh et al., J. Phys. Chem. C, 124, 22610-22618 (2020)
[3] Kothari et al., Chem. Mater. 16, 4232-4244 (2004)