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Electrochemical Communication Between Electrodes and Rhodobacter capsulatus Grown in Different Metabolic Modes

Hasan, Kamrul LU ; Reddy, Kesava Vijalapuram Raghava; Essmann, Vera; Gorecki, Kamil LU ; Conghaile, Peter O.; Schuhmann, Wolfgang; Leech, Donal; Hägerhäll, Cecilia LU and Gorton, Lo LU (2015) In Electroanalysis 27(1). p.118-127
Abstract
The majority of efforts on microbial and photosynthetic microbial fuel cells are both curiosity driven and made to possibly meet the future growing demand for sustainable energy. The most metabolically versatile purple bacteria Rhodobacter capsulatus is a potential candidate for this purpose. However, utilizing bacteria in such systems requires efficient electronic transfer communication between the microbial cells and the electrodes, which is one of the greatest challenges. Previous studies demonstrated that osmium redox polymers (ORPs) could be used for extracellular electron transfer between the cells and electrodes. Recently, heterotrophically grown R. capsulatus has been wired with ORP modified electrodes. Here in this communication,... (More)
The majority of efforts on microbial and photosynthetic microbial fuel cells are both curiosity driven and made to possibly meet the future growing demand for sustainable energy. The most metabolically versatile purple bacteria Rhodobacter capsulatus is a potential candidate for this purpose. However, utilizing bacteria in such systems requires efficient electronic transfer communication between the microbial cells and the electrodes, which is one of the greatest challenges. Previous studies demonstrated that osmium redox polymers (ORPs) could be used for extracellular electron transfer between the cells and electrodes. Recently, heterotrophically grown R. capsulatus has been wired with ORP modified electrodes. Here in this communication, we report electron transfer from R. capsulatus grown under heterotrophic as well as under photoheterotrophic conditions to electrodes. The cells, immobilized on bare graphite and ORP modified graphite electrodes, were excited with visible light and subsequent photosynthetic electron transfer was recorded using cyclic voltammetric and chronoamperometric measurements. Photoheterotrophically grown R. capsulatus cells on bare graphite generate a significant photocurrent density of 3.46 mu A cm(-2), whereas on an ORP modified electrode the current density increases to 8.46 mu A cm(-2). Furthermore, when 1 mM p-benzoquinone is added to the electrolyte the photocurrent density reaches 12.25 mu A cm(-2). Our results could have significant implications in photosynthetic energy conversion and in development of photobioelectrochemical devices. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Microbial fuel cell, Rhodobacter capsulatus, Photosynthesis, Light, Electrodes
in
Electroanalysis
volume
27
issue
1
pages
118 - 127
publisher
John Wiley & Sons
external identifiers
  • wos:000347838300015
  • scopus:84920996829
ISSN
1040-0397
DOI
10.1002/elan.201400456
language
English
LU publication?
yes
id
837c730f-22ba-4431-b8cd-17996672dddb (old id 5069975)
date added to LUP
2015-02-25 15:07:13
date last changed
2017-10-22 04:27:45
@article{837c730f-22ba-4431-b8cd-17996672dddb,
  abstract     = {The majority of efforts on microbial and photosynthetic microbial fuel cells are both curiosity driven and made to possibly meet the future growing demand for sustainable energy. The most metabolically versatile purple bacteria Rhodobacter capsulatus is a potential candidate for this purpose. However, utilizing bacteria in such systems requires efficient electronic transfer communication between the microbial cells and the electrodes, which is one of the greatest challenges. Previous studies demonstrated that osmium redox polymers (ORPs) could be used for extracellular electron transfer between the cells and electrodes. Recently, heterotrophically grown R. capsulatus has been wired with ORP modified electrodes. Here in this communication, we report electron transfer from R. capsulatus grown under heterotrophic as well as under photoheterotrophic conditions to electrodes. The cells, immobilized on bare graphite and ORP modified graphite electrodes, were excited with visible light and subsequent photosynthetic electron transfer was recorded using cyclic voltammetric and chronoamperometric measurements. Photoheterotrophically grown R. capsulatus cells on bare graphite generate a significant photocurrent density of 3.46 mu A cm(-2), whereas on an ORP modified electrode the current density increases to 8.46 mu A cm(-2). Furthermore, when 1 mM p-benzoquinone is added to the electrolyte the photocurrent density reaches 12.25 mu A cm(-2). Our results could have significant implications in photosynthetic energy conversion and in development of photobioelectrochemical devices.},
  author       = {Hasan, Kamrul and Reddy, Kesava Vijalapuram Raghava and Essmann, Vera and Gorecki, Kamil and Conghaile, Peter O. and Schuhmann, Wolfgang and Leech, Donal and Hägerhäll, Cecilia and Gorton, Lo},
  issn         = {1040-0397},
  keyword      = {Microbial fuel cell,Rhodobacter capsulatus,Photosynthesis,Light,Electrodes},
  language     = {eng},
  number       = {1},
  pages        = {118--127},
  publisher    = {John Wiley & Sons},
  series       = {Electroanalysis},
  title        = {Electrochemical Communication Between Electrodes and Rhodobacter capsulatus Grown in Different Metabolic Modes},
  url          = {http://dx.doi.org/10.1002/elan.201400456},
  volume       = {27},
  year         = {2015},
}