Solar-Driven Microbial Photoelectrochemical Cells with a Nanowire Photocathode
- 31 October 2010
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 10 (11), 4686-4691
- https://doi.org/10.1021/nl102977n
Abstract
We report a self-biased, solar-driven microbial photoelectrochemical cell (solar MPC) that can produce sustainable energy through coupling the microbial catalysis of biodegradable organic matter with solar energy conversion. The solar MPC consists of a p-type cuprous oxide nanowire-arrayed photocathode and an electricigen (Shewanella oneidensis MR-1)-colonizing anode, which can harvest solar energy and bioenergy, respectively. The photocathode and bioanode are interfaced by matching the redox potentials of bacterial cells and the electronic bands of semiconductor nanowires. We successfully demonstrated substantial current generation of 200 mu A from the MPC device based on the synergistic effect of the bioanode (projected area of 20 cm(2)) and photocathode (projected area of 4 cm(2)) at zero bias under white light illumination of 20 mW/cm(2). We identified the transition of rate-limiting step from the photocathode to the bioanode with increasing light intensities. The solar MPC showed self-sustained operation for more than 50 h in batch-fed mode under continuous light illumination, The ability to tune the synergistic effect between microbial cells and semiconductor nanowire systems could open up new opportunities for microbial/nanoelectronic hybrid devices with unique applications in energy conversion, environmental protection, and biomedical research.This publication has 34 references indexed in Scilit:
- Exoelectrogenic bacteria that power microbial fuel cellsNature Reviews Microbiology, 2009
- Towards environmental systems biology of ShewanellaNature Reviews Microbiology, 2008
- The Molecular Density of States in Bacterial NanowiresBiophysical Journal, 2008
- Shewanella secretes flavins that mediate extracellular electron transferProceedings of the National Academy of Sciences of the United States of America, 2008
- Effect of electron mediators on current generation and fermentation in a microbial fuel cellApplied Microbiology and Biotechnology, 2007
- Biofilm and Nanowire Production Leads to Increased Current in Geobacter sulfurreducens Fuel CellsApplied and Environmental Microbiology, 2006
- Mediating Electron Transfer from Bacteria to a Gold Electrode via a Self-Assembled MonolayerLangmuir, 2006
- Microbial Fuel Cells: Methodology and TechnologyEnvironmental Science & Technology, 2006
- Extracellular electron transfer via microbial nanowiresNature, 2005
- Harnessing microbially generated power on the seafloorNature Biotechnology, 2002