Effects of azide on electron transport of exoelectrogens in air-cathode microbial fuel cells

Xiangtong Zhou, Youpeng Qu, Byung Hong Kim, Pamela Yengfung Choo, Jia Liu, Yue Du, Weihua He, In Seop Chang, Nanqi Ren, Yujie Feng

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The effects of azide on electron transport of exoelectrogens were investigated using air-cathode MFCs. These MFCs enriched with azide at the concentration higher than 0.5. mM generated lower current and coulomb efficiency (CE) than the control reactors, but at the concentration lower than 0.2. mM MFCs generated higher current and CE. Power density curves showed overshoot at higher azide concentrations, with power and current density decreasing simultaneously. Electrochemical impedance spectroscopy (EIS) showed that azide at high concentration increased the charge transfer resistance. These analyses might reflect that a part of electrons were consumed by the anode microbial population rather than transferred to the anode. Bacterial population analyses showed azide-enriched anodes were dominated by Deltaproteobacteria compared with the controls. Based on these results it is hypothesized that azide can eliminate the growth of aerobic respiratory bacteria, and at the same time is used as an electron acceptor/sink.

Original languageEnglish
Pages (from-to)265-270
Number of pages6
JournalBioresource Technology
Volume169
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

Microbial fuel cells
Azides
fuel cell
Anodes
Cathodes
electron
air
Air
Electrons
Electrochemical impedance spectroscopy
Charge transfer
Bacteria
Current density
spectroscopy
bacterium
Electron Transport
effect

Keywords

  • Azide
  • Azide reduction
  • Coulomb efficiency
  • Electron acceptor
  • Power overshoot

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Waste Management and Disposal

Cite this

Effects of azide on electron transport of exoelectrogens in air-cathode microbial fuel cells. / Zhou, Xiangtong; Qu, Youpeng; Kim, Byung Hong; Choo, Pamela Yengfung; Liu, Jia; Du, Yue; He, Weihua; Chang, In Seop; Ren, Nanqi; Feng, Yujie.

In: Bioresource Technology, Vol. 169, 2014, p. 265-270.

Research output: Contribution to journalArticle

Zhou, X, Qu, Y, Kim, BH, Choo, PY, Liu, J, Du, Y, He, W, Chang, IS, Ren, N & Feng, Y 2014, 'Effects of azide on electron transport of exoelectrogens in air-cathode microbial fuel cells', Bioresource Technology, vol. 169, pp. 265-270. https://doi.org/10.1016/j.biortech.2014.07.012
Zhou, Xiangtong ; Qu, Youpeng ; Kim, Byung Hong ; Choo, Pamela Yengfung ; Liu, Jia ; Du, Yue ; He, Weihua ; Chang, In Seop ; Ren, Nanqi ; Feng, Yujie. / Effects of azide on electron transport of exoelectrogens in air-cathode microbial fuel cells. In: Bioresource Technology. 2014 ; Vol. 169. pp. 265-270.
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AU - Liu, Jia

AU - Du, Yue

AU - He, Weihua

AU - Chang, In Seop

AU - Ren, Nanqi

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AB - The effects of azide on electron transport of exoelectrogens were investigated using air-cathode MFCs. These MFCs enriched with azide at the concentration higher than 0.5. mM generated lower current and coulomb efficiency (CE) than the control reactors, but at the concentration lower than 0.2. mM MFCs generated higher current and CE. Power density curves showed overshoot at higher azide concentrations, with power and current density decreasing simultaneously. Electrochemical impedance spectroscopy (EIS) showed that azide at high concentration increased the charge transfer resistance. These analyses might reflect that a part of electrons were consumed by the anode microbial population rather than transferred to the anode. Bacterial population analyses showed azide-enriched anodes were dominated by Deltaproteobacteria compared with the controls. Based on these results it is hypothesized that azide can eliminate the growth of aerobic respiratory bacteria, and at the same time is used as an electron acceptor/sink.

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