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Biohybrid Photoelectrochemical Nanoengineered Interfaces

Published online by Cambridge University Press:  31 January 2011

Arati Sridharan ,
Jit Muthuswamy  and
Vincent B. Pizziconi
Arati Sridharan
Affiliation:
[email protected], Arizona State University, Bioengineering, ECG 334, MB 9709, Tempe, Arizona, 85287, United States
Jit Muthuswamy
Affiliation:
[email protected], Arizona State University, Bioengineering, Tempe, Arizona, United States
Vincent B. Pizziconi
Affiliation:
[email protected], Arizona State university, Bioengineering, Tempe, Arizona, United States
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Abstract

Incorporation of biophotonic components in artificial devices is an emerging trend in exploring biomimetic approaches for green technologies. In this study, highly efficient, nanoscaled light antenna structures from green photosynthetic bacteria, known as chlorosomes, comprised of bacteriochlorophyll-c pigment arrays that are stable in aqueous environments are studied in an electrochemical environment for their photoelectrogenic capacity. Biohybrid electrochemical cells containing chlorosomes coupled to the native bacterial photosynthetic apparatus have a higher dark charge storage density (at least 10-fold) than electrochemical cells with decoupled chlorosomes. Nevertheless, upon light stimulation, the charge storage density, also known as charge injection capacity, for both electrochemical systems increased the charge stored near the electrode. Decoupled chlorosome-based systems showed a light-intensity dose-dependent response reaching a maximum change of ˜300 nC/cm2 at near sunlight intensities (˜80-100mW/cm2). Chronoamperometric studies under light stimulation conditions confirmed the photo-induced effect. Current studies are focused on optimization of the electrode/chlorosome interfacial properties across various heterogeneous interfaces. Successful implementation of harvesting photo-energy using the chlorosome or its derivatives may lead to substantial innovations in current biophotonic technologies, such as biofuel cells and retinal prosthetics.

Keywords

biologicaloptoelectronicenergy storage
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1191: Symposium OO – Materials and Strategies for Lab-on-a-Chip–Biological Analysis, Cell-Material Interfaces and Fluidic Assembly of Nanostructures , 2009 , 1191-OO03-19
Copyright
Copyright © Materials Research Society 2009

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