Electrocatalytic carbohydrate oxidation with 4-benzoyloxy-TEMPO heterogenised in a polymer of intrinsic microporosity

Adam Kolodziej, Sunyhik D. Ahn, Mariolino Carta, Richard Malpass-Evans, Neil B. Mckeown, Robert S. L. Chapman, Steven D. Bull, Frank Marken

OAI: oai:purehost.bath.ac.uk:openaire_cris_publications/d067da79-38fd-4a98-8645-d439d9822580 • DOI: https://doi.org/10.1016/j.electacta.2015.01.106

The enzymeless and operationally simple electrocatalytic oxidation of carbohydrates by "heterogenised" 4-benzoyloxy-TEMPO either (i) immobilised as microcrystals at a glassy carbon electrode surface or (ii) embedded into a polymer of intrinsic microporosity (PIM-EA-TB with 1027 m²g^-1 BET surface area and highly rigid framework structure) has been studied in aqueous phosphate buffer of pH 12. It is shown that in contrast to microcrystal deposits, 4-benzolyoxy-TEMPO co-immobilised within PIM-EA-TB give stable catalytic responses for both, stationary and rotating disc electrode systems and for oxidation of glucose, sorbitol, and sucrose. The rigidity and intrinsic microporosity of PIM-EA-TB allow (slow) substrate and product diffusion, whilst maintaining 4-benzoyloxy-TEMPO immobilised in active molecular form.

Carbohydrate EC'mechanism catalyst Electrocatalysis fuel cell heterogenisation multi-electron sensor