Loading…
Immobilization of the [FeFe]-hydrogenase CrHydA1 on a gold electrode: Design of a catalytic surface for the production of molecular hydrogen
Hydrogenase-modified electrodes are a promising catalytic surface for the electrolysis of water with an overpotential close to zero. The [FeFe]-hydrogenase CrHydA1 from the photosynthetic green alga Chlamydomonas reinhardtii is the smallest [FeFe]-hydrogenase known and exhibits an extraordinary high...
Saved in:
Published in: | Journal of biotechnology 2009-06, Vol.142 (1), p.3-9 |
---|---|
Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | Hydrogenase-modified electrodes are a promising catalytic surface for the electrolysis of water with an overpotential close to zero. The [FeFe]-hydrogenase
CrHydA1 from the photosynthetic green alga
Chlamydomonas reinhardtii is the smallest [FeFe]-hydrogenase known and exhibits an extraordinary high hydrogen evolution activity. For the first time, we immobilized
CrHydA1 on a gold surface which was modified by different carboxy-terminated self-assembled monolayers. The immobilization was
in situ monitored by surface-enhanced infrared spectroscopy. In the presence of the electron mediator methyl viologen the electron transfer from the electrode to the hydrogenase was detected by cyclic voltammetry. The hydrogen evolution potential (−290
mV vs NHE, pH 6.8) of this protein modified electrode is close to the value for bare platinum (−270
mV vs NHE).
The surface coverage by
CrHydA1 was determined to 2.25
ng
mm
−2 by surface plasmon resonance, which is consistent with the formation of a protein monolayer. Hydrogen evolution was quantified by gas chromatography and the specific hydrogen evolution activity of surface-bound
CrHydA1 was calculated to 1.3
μmol
H
2
min
−1
mg
−1 (or 85
mol
H
2
min
−1
mol
−1). In conclusion, a viable hydrogen-evolving surface was developed that may be employed in combination with immobilized photosystems to provide a platform for hydrogen production from water and solar energy with enzymes as catalysts. |
---|---|
ISSN: | 0168-1656 1873-4863 |
DOI: | 10.1016/j.jbiotec.2009.01.018 |