期刊
FARADAY DISCUSSIONS
卷 155, 期 -, 页码 43-62出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1fd00098e
关键词
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资金
- UNC EFRC: Solar Fuels and Next Generation Photovoltaics, Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001011]
- National Institutes of Health [GM-48043, GM-71628]
- DOE ASCR under SciDAC-e [DE-FC02-06ER25764]
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM048043, R01GM071628] Funding Source: NIH RePORTER
Extracellular appendages of the dissimilatory metal-reducing bacterium Shewanella oneidensis MR-1 were recently shown to sustain currents of 1010 electrons per second over distances of 0.5 microns [El-Naggar et al., Proc. Natl. Acad. Sci. U. S. A., 2010, 107, 18127]. However, the identity of the charge localizing sites and their organization along the nanowire'' remain unknown. We use theory to predict redox cofactor separation distances that would permit charge flow at rates of 10 10 electrons per second over 0.5 microns for voltage biases of <= 1V, using a steady-state analysis governed by a non-adiabatic electron transport mechanism. We find the observed currents necessitate a multi-step hopping transport mechanism, with charge localizing sites separated by less than 1 nm and reorganization energies that rival the lowest known in biology.
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