Enhanced Activated Carbon Cathode Performance for Microbial Fuel Cell by Blending Carbon Black

Handle URI:
http://hdl.handle.net/10754/598176
Title:
Enhanced Activated Carbon Cathode Performance for Microbial Fuel Cell by Blending Carbon Black
Authors:
Zhang, Xiaoyuan; Xia, Xue; Ivanov, Ivan; Huang, Xia; Logan, Bruce E.
Abstract:
Activated carbon (AC) is a useful and environmentally sustainable catalyst for oxygen reduction in air-cathode microbial fuel cells (MFCs), but there is great interest in improving its performance and longevity. To enhance the performance of AC cathodes, carbon black (CB) was added into AC at CB:AC ratios of 0, 2, 5, 10, and 15 wt % to increase electrical conductivity and facilitate electron transfer. AC cathodes were then evaluated in both MFCs and electrochemical cells and compared to reactors with cathodes made with Pt. Maximum power densities of MFCs were increased by 9-16% with CB compared to the plain AC in the first week. The optimal CB:AC ratio was 10% based on both MFC polarization tests and three electrode electrochemical tests. The maximum power density of the 10% CB cathode was initially 1560 ± 40 mW/m2 and decreased by only 7% after 5 months of operation compared to a 61% decrease for the control (Pt catalyst, 570 ± 30 mW/m2 after 5 months). The catalytic activities of Pt and AC (plain or with 10% CB) were further examined in rotating disk electrode (RDE) tests that minimized mass transfer limitations. The RDE tests showed that the limiting current of the AC with 10% CB was improved by up to 21% primarily due to a decrease in charge transfer resistance (25%). These results show that blending CB in AC is a simple and effective strategy to enhance AC cathode performance in MFCs and that further improvement in performance could be obtained by reducing mass transfer limitations. © 2014 American Chemical Society.
Citation:
Zhang X, Xia X, Ivanov I, Huang X, Logan BE (2014) Enhanced Activated Carbon Cathode Performance for Microbial Fuel Cell by Blending Carbon Black. Environ Sci Technol 48: 2075–2081. Available: http://dx.doi.org/10.1021/es405029y.
Publisher:
American Chemical Society (ACS)
Journal:
Environmental Science & Technology
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
4-Feb-2014
DOI:
10.1021/es405029y
PubMed ID:
24422458
Type:
Article
ISSN:
0013-936X; 1520-5851
Sponsors:
The authors thank Valerie Watson and Marta Hatzell for the help with RDE and EIS analyses and David Jones for laboratory support. This research was supported by the Strategic Environmental Research and Development Program (SERDP) and Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST). The authors thank the anonymous reviewers for their instructive comments.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorZhang, Xiaoyuanen
dc.contributor.authorXia, Xueen
dc.contributor.authorIvanov, Ivanen
dc.contributor.authorHuang, Xiaen
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T13:14:07Zen
dc.date.available2016-02-25T13:14:07Zen
dc.date.issued2014-02-04en
dc.identifier.citationZhang X, Xia X, Ivanov I, Huang X, Logan BE (2014) Enhanced Activated Carbon Cathode Performance for Microbial Fuel Cell by Blending Carbon Black. Environ Sci Technol 48: 2075–2081. Available: http://dx.doi.org/10.1021/es405029y.en
dc.identifier.issn0013-936Xen
dc.identifier.issn1520-5851en
dc.identifier.pmid24422458en
dc.identifier.doi10.1021/es405029yen
dc.identifier.urihttp://hdl.handle.net/10754/598176en
dc.description.abstractActivated carbon (AC) is a useful and environmentally sustainable catalyst for oxygen reduction in air-cathode microbial fuel cells (MFCs), but there is great interest in improving its performance and longevity. To enhance the performance of AC cathodes, carbon black (CB) was added into AC at CB:AC ratios of 0, 2, 5, 10, and 15 wt % to increase electrical conductivity and facilitate electron transfer. AC cathodes were then evaluated in both MFCs and electrochemical cells and compared to reactors with cathodes made with Pt. Maximum power densities of MFCs were increased by 9-16% with CB compared to the plain AC in the first week. The optimal CB:AC ratio was 10% based on both MFC polarization tests and three electrode electrochemical tests. The maximum power density of the 10% CB cathode was initially 1560 ± 40 mW/m2 and decreased by only 7% after 5 months of operation compared to a 61% decrease for the control (Pt catalyst, 570 ± 30 mW/m2 after 5 months). The catalytic activities of Pt and AC (plain or with 10% CB) were further examined in rotating disk electrode (RDE) tests that minimized mass transfer limitations. The RDE tests showed that the limiting current of the AC with 10% CB was improved by up to 21% primarily due to a decrease in charge transfer resistance (25%). These results show that blending CB in AC is a simple and effective strategy to enhance AC cathode performance in MFCs and that further improvement in performance could be obtained by reducing mass transfer limitations. © 2014 American Chemical Society.en
dc.description.sponsorshipThe authors thank Valerie Watson and Marta Hatzell for the help with RDE and EIS analyses and David Jones for laboratory support. This research was supported by the Strategic Environmental Research and Development Program (SERDP) and Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST). The authors thank the anonymous reviewers for their instructive comments.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleEnhanced Activated Carbon Cathode Performance for Microbial Fuel Cell by Blending Carbon Blacken
dc.typeArticleen
dc.identifier.journalEnvironmental Science & Technologyen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
dc.contributor.institutionTsinghua University, Beijing, Chinaen
kaust.grant.numberKUS-I1-003-13en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.