Quantifying the density and utilization of active sites in non-precious metal oxygen electroreduction catalysts
Technische Universität Berlin · Technische Universität Darmstadt · +1 more institution
Abstract
Carbon materials doped with transition metal and nitrogen are highly active, non-precious metal catalysts for the electrochemical conversion of molecular oxygen in fuel cells, metal air batteries, and electrolytic processes. However, accurate measurement of their intrinsic turn-over frequency and active-site density based on metal centres in bulk and surface has remained difficult to date, which has hampered a more rational catalyst design. Here we report a successful quantification of bulk and surface-based active-site density and associated turn-over frequency values of mono- and bimetallic Fe/N-doped carbons using a combination of chemisorption, desorption and (57)Fe Mössbauer spectroscopy techniques. Our…
Citation impact
- FWCI
- 14.55
- Percentile
- 100%
- References
- 47
Authors
8Topics & keywords
- Bimetallic strip
- Catalysis
- Active site
- Materials science
- Chemisorption
- Metal
- Electrochemistry
- Chemical engineering