Journal
CHEMCATCHEM
Volume 7, Issue 16, Pages 2455-2459Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201500623
Keywords
atomic layer deposition; electrochemistry; iron oxide; mesoporous materials; oxygen evolution reaction
Categories
Funding
- Bundesministerium fur Bildung und Forschung (BMBF) project 'tubulAir +/-' [03SF0436G]
- Deutsche Forschungsgemeinschaft (DFG) Cluster of Excellence Engineering of Advanced Materials
Ask authors/readers for more resources
The geometric effects of nanostructuring a pure Fe2O3 surface on its electrochemical water oxidation performance at neutral pH were systematically explored. Atomic layer deposition was used to coat the inner walls of cylindrical anodic nanopores ordered in parallel arrays with a homogeneous Fe2O3 layer. Annealing and electrochemical treatments generated a roughened surface, as demonstrated by X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy, the larger geometric area of which increases current densities. Combining these treatments with the anodic pore geometry delivered an effective increase in turnover by almost three orders of magnitude with respect to a smooth, planar Fe2O3 surface. However, the current density depended on the pore length in a non-monotonic manner. An optimal length was found that maximized turnover by equating the rate of transport in the electrolyte with that of charge transfer across the interface.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available