scholarly journals Biofilm conductivity is a decisive variable for high-current-density Geobacter sulfurreducens microbial fuel cells

2012 ◽  
Vol 5 (2) ◽  
pp. 5790 ◽  
Author(s):  
Nikhil S. Malvankar ◽  
Mark T. Tuominen ◽  
Derek R. Lovley
Keyword(s):  
Fuel Cells ◽  
Current Density ◽  
Microbial Fuel Cells ◽  
High Current Density ◽  
Geobacter Sulfurreducens ◽  
High Current

The Nature of Flooding and Drying in Polymer Electrolyte Fuel Cells

2005 ◽  
Author(s):  
P. A. Chuang ◽  
A. Turhan ◽  
A. K. Heller ◽  
J. S. Brenizer ◽  
T. A. Trabold ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Current Density ◽  
Liquid Water ◽  
High Current Density ◽  
Liquid Water Content ◽  
Small Mass ◽  
Neutron Imaging ◽  
Small Range ◽  
High Current ◽  
Voltage Loss

Two different 50 cm2 fuel cells operated at high current density (1.3A/cm2–1.5A/cm2) were visualized using neutron imaging, and the liquid water content in the flow channels and diffusion media under the lands and channels was calculated and compared. At high current density with fully humidified inlet flow, a direct comparison between flooded and non-flooded conditions was achieved by increasing the fuel cell temperature over a small range, until voltage loss from flooding was alleviated. Results indicate that a surprisingly small mass of liquid water is responsible for a significant voltage loss. The deleterious effects of flooding are therefore more easily explained with a locally segregated flooded pore model, rather than a homogeneously flooded pore and blockage phenomenon. Anode dryout was similarly observed and quantified, and results indicate that an exceedingly small mass of water is responsible for significant voltage loss, which is consistent with expectations. The results presented help to form a more complete vision of the flooding loss and anode dryout phenomena in PEFCs.

Performance and mass transport in open metallic element architecture fuel cells at ultra-high current density

2012 ◽  
Vol 218 ◽  
pp. 341-347 ◽  
Author(s):  
A.K. Srouji ◽  
L.J. Zheng ◽  
R. Dross ◽  
A. Turhan ◽  
M.M. Mench
Keyword(s):  
Fuel Cells ◽  
Mass Transport ◽  
Current Density ◽  
High Current Density ◽  
High Current ◽  
Metallic Element

scholarly journals Unexpected Genomic Features of High Current Density-Producing Geobacter sulfurreducens strain YM18

2021 ◽  
Author(s):  
Takashi Fujikawa ◽  
Yoshitoshi Ogura ◽  
Koki Ishigami ◽  
Yoshihiro Kawano ◽  
Miyuki Nagamine ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Current Density ◽  
Iron Reduction ◽  
High Current Density ◽  
Model Organism ◽  
Geobacter Sulfurreducens ◽  
Extracellular Electron Transfer ◽  
High Current ◽  
Current Production ◽  
Current Densities

Abstract Geobacter sulfurreducens produces high current densities and it has been used as a model organism for extracellular electron transfer studies. Nine G. sulfurreducens strains were isolated from biofilms formed on an anode poised at –0.2 V (vs. SHE) in a bioelectrochemical system in which river sediment was used as an inoculum. The maximum current density of an isolate, strain YM18 (9.29 A/m2), was higher than that of the strains PCA (5.72 A/m2), the type strain of G. sulfurreducens, and comparable to strain KN400 (8.38 A/m2), which is another high current producing strain of G. sulfurreducens. Genomic comparison of strains PCA, KN400, and YM18 revealed that omcB, xapD, spc, and ompJ, which are known to be important genes for iron reduction and current production in PCA, were not present in YM18. In the PCA and KN400 genomes, two and one region (s) encoding CRISPR/Cas systems were identified, respectively, but they were missing in the YM18 genome. These results indicate that there is genetic variation in the key components involved in extracellular electron transfer among G. sulfurreducens strains.

Sign in / Sign up

Export Citation Format

Share Document