TY - GEN
T1 - Self assembled monolayer (SAM) of metallomacrocycle as a synthetic cathode catalyst for a hybrid bio-fuel-cell
AU - Gervasio, D.
AU - Thomson, J.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - A hybrid bio-fuel-cell (HBFC) has one electrode with an enzyme catalyst and another with a synthetic catalyst. A new cobalt(II) porphyrin, Col, was synthesized as an oxygen reduction catalyst for a cathode in a HBFC. Col has a covalently attached phosphonate group, which gives Col affinity for metal oxide so it can form a self-assembled monolayer (SAM) on an electrode with an oxide surface. Voltammetry of a SAM of Col on an indium tin oxide (ITO) electrode in aqueous 0.01 molar TFMSA solution equilibrated with 1 atmosphere of Argon showed a surface charge corresponding to a monolayer of Col. In the same triflic acid solution equilibrated with oxygen, a bare ITO electrode did not reduce oxygen at any potential, but the same ITO electrode after coated with a SAM of Col exhibited substantial oxygen electro reduction current, which began at 0.65 V versus NHE and was not affected by the presence of methanol. This selectivity indicates that a SAM of Col is a promising catalyst for a cathode, which can selectively scavenge oxygen from biological sera which also contains alcohols and other organic species.
AB - A hybrid bio-fuel-cell (HBFC) has one electrode with an enzyme catalyst and another with a synthetic catalyst. A new cobalt(II) porphyrin, Col, was synthesized as an oxygen reduction catalyst for a cathode in a HBFC. Col has a covalently attached phosphonate group, which gives Col affinity for metal oxide so it can form a self-assembled monolayer (SAM) on an electrode with an oxide surface. Voltammetry of a SAM of Col on an indium tin oxide (ITO) electrode in aqueous 0.01 molar TFMSA solution equilibrated with 1 atmosphere of Argon showed a surface charge corresponding to a monolayer of Col. In the same triflic acid solution equilibrated with oxygen, a bare ITO electrode did not reduce oxygen at any potential, but the same ITO electrode after coated with a SAM of Col exhibited substantial oxygen electro reduction current, which began at 0.65 V versus NHE and was not affected by the presence of methanol. This selectivity indicates that a SAM of Col is a promising catalyst for a cathode, which can selectively scavenge oxygen from biological sera which also contains alcohols and other organic species.
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U2 - 10.1149/1.3036211
DO - 10.1149/1.3036211
M3 - Conference contribution
AN - SCOPUS:65849124138
SN - 9781605606590
T3 - ECS Transactions
SP - 51
EP - 66
BT - ECS Transactions - Biological Fuel Cells 3
T2 - Biological Fuel Cells 3 - 213th Meeting of the Electrochemical Society
Y2 - 18 May 2008 through 23 May 2008
ER -