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Impact of single-pulse, low-intensity laser post-processing on structure and activity of mesostructured cobalt oxide for the oxygen evolution reaction

DOI: 10.1021/acsami.1c08034 DOI Help

Authors: Eko Budiyanto (Max-Planck-Institut für Kohlenforschung) , Swen Zerebecki (University of Duisburg-Essen) , Claudia Weidenthaler (Max-Planck-Institut für Kohlenforschung) , Tim Kox (University of Duisburg-Essen) , Stephane Kenmoe (University of Duisburg-Essen) , Eckhard Spohr (University of Duisburg-Essen) , Serena Debeer (Max Planck Institute for Chemical Energy Conversion) , Olaf Rudiger (Max Planck Institute for Chemical Energy Conversion) , Sven Reichenberger (University of Duisburg-Essen) , Stephan Barcikowski (University of Duisburg-Essen) , Harun Tuysuz (Max-Planck-Institut für Kohlenforschung)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Applied Materials & Interfaces

State: Published (Approved)
Published: July 2021
Diamond Proposal Number(s): 25636

Open Access Open Access

Abstract: 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.

Journal Keywords: reactive laser processing; defect engineering; oxygen evolution reaction; cobalt oxide; electrocatalyst; X-ray spectroscopy

Subject Areas: Chemistry, Materials, Energy

Instruments: I20-Scanning-X-ray spectroscopy (XAS/XES)

Other Facilities: P02.1 at PETRA III

Added On: 02/08/2021 09:01


Discipline Tags:

Catalysis Earth Sciences & Environment Climate Change Energy Sustainable Energy Systems Materials Science Chemistry

Technical Tags:

Spectroscopy X-ray Emission Spectroscopy (XES)