Back to Search
Start Over
Tracking high-valent surface iron species in the oxygen evolution reaction on cobalt iron (oxy)hydroxides
- Source :
- Energy & Environmental Science. 15:206-214
- Publication Year :
- 2022
- Publisher :
- Royal Society of Chemistry (RSC), 2022.
-
Abstract
- The oxygen evolution reaction (OER) is the bottleneck reaction of water splitting, which can be used to generate green hydrogen from renewable electricity. Cobalt iron oxyhydroxides (CoFeOxHy) are among the most active OER catalysts in alkaline medium. However, the active sites of these catalysts remain unclear. Here we use operando ultraviolet-visible (UV-Vis), X-ray absorption, and Raman spectroscopy to reveal oxidations of both Fe and Co ions in CoFeOxHy during the OER. By analyzing samples with different Fe contents and thickness, we find that the concentration of Fe4+ species at the surface, but not the concentration of Co4+ in the bulk, scales with the catalytic activity. These results indicate an Fe4+-containing active site in CoFeOxHy.
- Subjects :
- ni
nanosheets
Hydrogen
Inorganic chemistry
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
electrocatalysts
size
01 natural sciences
7. Clean energy
catalysts
Catalysis
state
symbols.namesake
Environmental Chemistry
biology
Renewable Energy, Sustainability and the Environment
Chemistry
Oxygen evolution
Active site
021001 nanoscience & nanotechnology
Pollution
0104 chemical sciences
water oxidation
Nuclear Energy and Engineering
13. Climate action
biology.protein
symbols
identification
Water splitting
nanoparticles
oxide
Absorption (chemistry)
0210 nano-technology
Raman spectroscopy
Cobalt
Subjects
Details
- ISSN :
- 17545706 and 17545692
- Volume :
- 15
- Database :
- OpenAIRE
- Journal :
- Energy & Environmental Science
- Accession number :
- edsair.doi.dedup.....e22db0fec7b55a04ab708951161696e4