Combinatorial biomimetics. optimization of a composition of copper(II) poly-L-histidine complex as an electrocatalyst for O2 reduction by scanning electrochemical microscopy.
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.
Weng
Yu Ching
YC
Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712, USA.
Fan
Fu-Ren F
FR
Bard
Allen J
AJ
D040761:Biomimetic Materials / Q000737:chemistry*; D002384:Catalysis; D002413:Cations, Divalent; D003300:Copper / Q000737:chemistry*; D004563:Electrochemistry; D006639:Histidine / Q000737:chemistry*; D008667:Metalloproteins / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*
D002413:Cations, Divalent; D008667:Metalloproteins; C033223:polyhistidine; D006639:Histidine; D003300:Copper; D010100:Oxygen