Impact of Single-Pulse, Low-Intensity Laser Post-Processing on Structure and Activity of Mesostructured Cobalt Oxide for the Oxygen Evolution Reaction
| Autor: | Stephan Barcikowski, Swen Zerebecki, Harun Tüysüz, Olaf Rüdiger, Serena DeBeer, Eko Budiyanto, Sven Reichenberger, Eckhard Spohr, Stephane Kenmoe, Tim Kox, Claudia Weidenthaler |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
X-ray absorption spectroscopy
Materials science Absorption spectroscopy reactive laser processing cobalt oxide Chemie Oxygen evolution Analytical chemistry chemistry.chemical_element Overpotential defect engineering symbols.namesake X-ray photoelectron spectroscopy chemistry oxygen evolution reaction Forum Article X-ray spectroscopy symbols electrocatalyst General Materials Science Raman spectroscopy ddc:600 Cobalt Cobalt oxide |
| Zdroj: | ACS applied materials & interfaces 13(44), 51962-51973 (2021). doi:10.1021/acsami.1c08034 ACS Applied Materials & Interfaces |
| DOI: | 10.3204/pubdb-2021-05206 |
| Popis: | ACS applied materials & interfaces 13(44), 51962 - 51973 (2021). doi:10.1021/acsami.1c08034 Herein, we report nanosecond, single-pulse laser post-processing (PLPP) in a liquid flat jet with precise control of the applied laser intensity to tune structure, defect sites, and the oxygen evolution reaction (OER) activity of mesostructured Co$_3$O$_4$. High-resolution X-ray diffraction (XRD), Raman, and X-ray photoelectron spectroscopy (XPS) are consistent with the formation of cobalt vacancies at tetrahedral sites and an increase in the lattice parameter of Co$_3$O$_4$ after the laser treatment. X-ray absorption spectroscopy (XAS) and X-ray emission spectroscopy (XES) further reveal increased disorder in the structure and a slight decrease in the average oxidation state of the cobalt oxide. Molecular dynamics simulation confirms the surface restructuring upon laser post-treatment on Co$_3$O$_4$. Importantly, the defect-induced PLPP was shown to lower the charge transfer resistance and boost the oxygen evolution activity of Co$_3$O$_4$. For the optimized sample, a 2-fold increment of current density at 1.7 V vs RHE is obtained and the overpotential at 10 mA/cm$^2$ decreases remarkably from 405 to 357 mV compared to pristine Co$_3$O$_4$. Post-mortem characterization reveals that the material retains its activity, morphology, and phase structure after a prolonged stability test. Published by Soc., Washington, DC |
| Databáze: | OpenAIRE |
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