Understanding and improving the microbial fuel cell anodic electron transfer process
The cell surface c-type cytochromes (c-Cyts) of Shewanella oneidensis demonstrated irreversible electrochemistry and sluggish electron transfer (ET) rate. c-Cyts could accumulate at the Shewanella-electrode interface when a more positive potential was applied to the electrode. Such accumula...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2012
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/48051 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | The cell surface c-type cytochromes (c-Cyts) of Shewanella oneidensis demonstrated
irreversible electrochemistry and sluggish electron transfer (ET) rate. c-Cyts could
accumulate at the Shewanella-electrode interface when a more positive potential was
applied to the electrode. Such accumulation may insulate the electrode from flavins, a
more effective ET pathway utilized by Shewanella. This potential-dependent
physiology had been observed with Ferrimonas balearica as well, which is genetically
distant from S. oneidensis. This supported the representiveness of the model
exoelectrogen.
To promote the heterogeneous ET through S. oneidensis outer membrane c-Cyts, the
electrode was modified with carbon nanotubes (CNTs). This modification transformed
the rectification behavior of the OM c-Cyts and enhanced their heterogeneous rate
constant. The bioelectrocatalytic current generation recorded by chronoamperometry
was increased for over 80 times. Furthermore, in a fuel cell catalyzed by mixed
microbial consortium, the CNT modified anode was shown to enhance power
generation with promoted ET kinetics. |
|---|