Title

Bis(histidine)/Bis(imidazole) Heme complex - Polymer electrolyte fuel cell application as an alternative cathode electrode catalyst

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

e-Journal of Surface Science and Nanotechnology

Volume

3

First Page

233

Last Page

236

Publication Date

8-24-2005

Abstract

We focus on a variant of the heme protein, i.e., the recently discovered neuroglobin (NHb) and cytoglobin (CHb), looking for clues with regard to possible applications in polymer electrolyte fuel cells (PEFCs), in a quest to design nanomaterials that would replace the expensive platinum catalysts used in PEFC electrodes. The active heme sites of these two new members of the globin superfamily display a functionally-relevant heme iron atom, whose sixth coordination site is occupied by an endogenous (internal) protein ligand, in the absence of exogenous (external) ligands, such as O2, CO, and NO. Density Functional Theory (DFT)-based calculation results indicate a possible means of controlling the adsorption and desorption on adsorbed O2 through the endogenous protein ligand occupying the sixth coordination site of the central iron atom in the heme structure. © 2005 The Surface Science Society of Japan.

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Digitial Object Identifier (DOI)

10.1380/ejssnt.2005.233

Keywords

Cathodes; Catalysis; Proton exchange membrane fuel cells; Iron; Oxygen; Chemisorption; Density functionals; Nanostructures; Bioactive compounds

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