- LSF ID
- 58104
- ORCID
- 0000-0003-3006-1333
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 1121141544
- LSF ID
- 55953
- ORCID
- 0000-0003-3622-2716
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 143257005
- LSF ID
- 49123
- ORCID
- 0000-0001-8148-7575
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 1137216204
- LSF ID
- 58243
- ORCID
- 0000-0002-7166-9428
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 129006084
- LSF ID
- 52773
- ORCID
- 0000-0002-9739-7272
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
Abstract in Englisch:
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 Co3O4. 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 Co3O4 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 Co3O4. Importantly, the defect-induced PLPP was shown to lower the charge transfer resistance and boost the oxygen evolution activity of Co3O4. 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/cm2 decreases remarkably from 405 to 357 mV compared to pristine Co3O4. Post-mortem characterization reveals that the material retains its activity, morphology, and phase structure after a prolonged stability test.