2014
DOI: 10.1002/cssc.201402377
|View full text |Cite
|
Sign up to set email alerts
|

Multiple Cathodic Reaction Mechanisms in Seawater Cathodic Biofilms Operating in Sediment Microbial Fuel Cells

Abstract: In this study, multiple reaction mechanisms in cathodes of sediment microbial fuel cells (SMFCs) were characterized by using cyclic voltammetry and microelectrode measurements of dissolved oxygen and pH. The cathodes were acclimated in SMFCs with sediment and seawater from San Diego Bay. Two limiting current regions were observed with onset potentials of approximately +400 mVAg/AgCl for limiting current I and -120 mVAg/AgCl for limiting current II. The appearance of two catalytic waves suggests that multiple c… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

0
22
0

Year Published

2015
2015
2023
2023

Publication Types

Select...
4
2
1

Relationship

2
5

Authors

Journals

citations
Cited by 23 publications
(22 citation statements)
references
References 23 publications
0
22
0
Order By: Relevance
“…27,40,42 The presence of both α-and γ-proteobacteria at the cathode, along with previous studies 33,34,42 may suggest some form of iron cycling as iron oxidizers (α-proteobacteria and γ-proteobacteria) and iron reducers (γ-proteobacteria) could both be present in the cathodic biofilm. Though, it is unclear if this activity is occuring at the cathode and should be studied with a more in-depth transcriptomic and proteomic study of SMFC biocathodes.…”
Section: Discussionmentioning
confidence: 54%
“…27,40,42 The presence of both α-and γ-proteobacteria at the cathode, along with previous studies 33,34,42 may suggest some form of iron cycling as iron oxidizers (α-proteobacteria and γ-proteobacteria) and iron reducers (γ-proteobacteria) could both be present in the cathodic biofilm. Though, it is unclear if this activity is occuring at the cathode and should be studied with a more in-depth transcriptomic and proteomic study of SMFC biocathodes.…”
Section: Discussionmentioning
confidence: 54%
“…27 The presence of competing reactions on the cathode (such as sulfate reduction, which has a standard reduction potential of −39 mV vs. Ag/AgCl 36 ) could also explain the relatively low cathode potential compared to similar SMFCs deployed in freshwater 2,25 and ocean water sediments. 32,37 We should note that sulfate reduction is possible in the presence of a thick biofilm in which the top layers consume oxygen and generate anoxic conditions for the sulfate reducers at the bottom of the biofilm. Figure 6B shows the capacitor potential recorded using an RSM-FCT with a 5-F capacitor which was charged between 300 and 400 mV.…”
Section: Resultsmentioning
confidence: 99%
“…[21] The long time powerg eneration resulted in the powerd ecrease to around1 mW after [21] The corresponding electrode potentials during the operation of SMFC-1 are shown in Figure 10 B, where both the cathodea nd the anode potentials are initially around7 5mV vs. Ag/AgCl (black arrow), the cathode potential increased to around3 75 mV vs. Ag/AgClw ithin af ew days, and then slowly increased to 395 mV vs. Ag/AgClw hile the anode potential decreasedi nitially to about À400 mV vs. Ag/AgCl and then increaseds lowly to av alue slightly below 0mVv s. Ag/AgCl. [21] The acclimated cathodes of SMGCs have distinct performance advantages as compared to unacclimated cathodes with possible implications for cathode scalinga nd size. [21] …”
Section: à2mentioning
confidence: 99%
“…[21] The acclimated cathodes of SMGCs have distinct performance advantages as compared to unacclimated cathodes with possible implications for cathode scalinga nd size. [21] …”
Section: à2mentioning
confidence: 99%
See 1 more Smart Citation