Abstract
For the case of the commercially available metal-organic framework (MOF) structure Basolite (TM) F300 or Fe (BTC) with BTC = benzene-1,3,5-tricarboxylate, it is shown that the Fe(III/II) electrochemistry is dominated by reductive dissolution rather than ion insertion (which in marked contrast is dominating the behaviour of Fe(III/I) open framework processes in Prussian blues). Solid Fe(BTC) immobilised onto graphite or platinum working electrodes is investigated and it is shown that well-defined and reversible Fe(III/II) reduction responses occur only on platinum and in the presence of aqueous acid. The process is shown to follow a CE-type mechanism involving liberation of Fe(III) in acidic media, in particular for high concentrations of acid. Effective electrocatalysis for the oxidation of hydroxide to O-2 (anodic water splitting) is observed in alkaline aqueous media after initial cycling of the potential into the reduction potential zone. A mechanism based on a MOF-surface confined hydrous iron oxide film is proposed.
| Original language | English |
|---|---|
| Pages (from-to) | 632-635 |
| Number of pages | 4 |
| Journal | Electrochemistry Communications |
| Volume | 12 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - May 2010 |
Keywords
- sensor
- Prussian blue
- water splitting
- voltammetry
- reductive dissolution
- MOF
- host guest electrochemistry