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Spectroscopic Studies of Nanoparticulate Thin Films of a Cobalt-Based Oxygen Evolution Catalyst
Abstract
Nanoparticle (NP) cobalt–phosphate (Co-P<sub>i</sub>) water oxidation catalysts are prepared as thin films by anodic electrodeposition from solutions of Co<sup>2+</sup> dissolved in proton-accepting electrolytes. Compositional and structural insight into the nature of the catalyst film is provided from advanced spectroscopy. Infrared spectra demonstrate that counteranions incorporate into the Co-P<sub>i</sub> thin films and that the phosphate ion, among various anion electrolytes, exhibits the highest binding affinity to the cobalt centers. Atomic force microscopy images show a highly porous morphology of the thin film that is composed of Co-P<sub>i</sub> NPs. Whereas conventional X-ray powder diffraction technique shows catalyst films to be amorphous, synchrotron-based X-ray grazing incidence diffraction reveals well-defined diffraction patterns that are indicative of long-range ordering within the film. Azimuthal scans imply that as-prepared films possess a highly preferred orientation and texture on the electrode surface- Text
- Journal contribution
- Biochemistry
- Medicine
- Biotechnology
- Evolutionary Biology
- Ecology
- Inorganic Chemistry
- Plasma Physics
- Space Science
- Environmental Sciences not elsewhere classified
- Chemical Sciences not elsewhere classified
- Physical Sciences not elsewhere classified
- Azimuthal scans
- catalyst film
- phosphate ion
- Spectroscopic Studies
- Atomic force microscopy images show
- anion electrolytes
- catalyst films
- anodic electrodeposition
- water oxidation catalysts
- incidence diffraction
- NP
- cobalt centers
- electrode surface
- binding affinity
- Infrared spectra
- diffraction patterns