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Combinatorial Biomimetics. Optimization of a Composition of Copper(II) Poly-l-Histidine Complex as an Electrocatalyst for O2 Reduction by Scanning Electrochemical Microscopy

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journal contribution
posted on 21.12.2005, 00:00 by Yu Ching Weng, Fu-Ren F. Fan, Allen J. Bard
A simple approach to prepare and characterize biomaterial-based electrocatalysts for oxygen reduction was carried out. Poly-l-histidine was used as a matrix and ligand to complex Cu2+ to mimic the active sites of laccases. A modified glassy carbon (GC) electrode with Cu2+-poly-l-histidine complex decreases the oxygen reduction overpotential as compared with the bare GC electrode. An array of Cu2+-poly-l-histidine spots with different compositions was deposited on a GC substrate, and their catalytic activity for oxygen reduction was evaluated by a scanning electrochemical microscopy-based screening technique. The electrocatalytic activities of complexes for oxygen reduction strongly depended on the mole ratio of Cu2+ to poly-l-histidine and the applied potential of the substrate.