Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 22, Issue 7, Pages 1409-1416Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201101946
Keywords
catechol; chitosan; glucose dehydrogenase; reactive oxygen species; redox capacitor
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Funding
- Robert W. Deutsch Foundation
- National Science Foundation [EFRI-0735987]
- Department of Defense (Defense Threat Reduction Agency) [BO085PO008]
- Department of Defense (Office of Naval Research) [N000141010446]
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Electronic devices process information and transduce energy with electrons, while biology performs such operations with ions and chemicals. To establish bio-device connectivity, we fabricate a redox-capacitor film from a polysaccharide (i.e., chitosan) and a redox-active catechol. We report that these films are rapidly and repeatedly charged and discharged electrochemically via a redox-cycling mechanism in which mediators shuttle electrons between the electrode and film (capacitance 40 F/g or 2.9 mF/cm2). Further, charging and discharging can be executed under bio-relevant conditions. Enzymatic-charging is achieved by electron-transfer from glucose to the film via an NADPH-mediated redox-cycling mechanism. Discharging occurs by electron-donation to O2 to generate H2O2 that serves as substrate for peroxidase-mediated biochemical reactions. Thus, these films offer the capability of inter-converting electrochemical and biochemical inputs/outputs. Among potential applications, we anticipate that catecholchitosan redox-capacitor films could serve as circuit elements for molecular logic operations or for transducing bio-based chemical energy into electricity.
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