Abstract:
:In bioelectrochemical system (BES) the extracellular electron transfer (EET) from bacteria to anode electrode is recognized as a crucial step that governs the anodic reaction efficiency. Here, we report a novel approach to substantially enhance the microbial EET by immobilization of a small active phenothiazine derivative, methylene blue, on electrode surface. A comparison of the currents generated by Shewanella oneidensis MR-1 and its mutants as well as the electrochemical analytical results reveal that the accelerated EET was attributed to enhanced interactions between the bacterial outer-membrane cytochromes and the immobilized methylene blue. A further investigation into the process using in situ Raman spectro-electrochemical method coupled with density functional theory calculations demonstrates that the electron shuttling was achieved through the change of the molecule conformation of phenothiazine in the redox process. These results offer useful information for engineering BES.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Liu XW,Sun XF,Chen JJ,Huang YX,Xie JF,Li WW,Sheng GP,Zhang YY,Zhao F,Lu R,Yu HQdoi
10.1038/srep01616subject
Has Abstractpub_date
2013-01-01 00:00:00pages
1616issn
2045-2322pii
srep01616journal_volume
3pub_type
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