Performance of microbial electrolysis cells with bioanodes grown at different external resistances

Laura Rago, Nuria Monpart, Pilar Cortés, Juan A. Baeza, Albert Guisasola

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)


© IWA Publishing 2016. Bioelectrochemical systems need an anode with a high abundance of exoelectrogenic bacteria for an optimal performance. Among all possible operational parameters for an efficient enrichment, the role of external resistance in microbial fuel cell (MFC) has gained a lot of interest since it indirectly poises an anode potential, a key parameter for biofilm distribution and morphology. Thus, this work aims at investigating and discussing whether bioanodes selected at different external resistances under MFC operation present different responses under both MFC and microbial electrolysis cell (MEC) operation. A better MEC performance (i.e. shorter start-up time, higher current intensity and higher H2 production rate) was obtained with an anode from an MFC developed under low external resistance. Quantitative real-time polymerase chain reaction (qPCR) confirmed that a low external resistance provides an MFC anodic biofilm with the highest content of Geobacter because it allows higher current intensity, which is correlated to exoelectrogenic activity. High external resistances such as 1,000 Ω led to a slower start-up time under MEC operation.
Original languageEnglish
Pages (from-to)1129-1135
JournalWater Science and Technology
Issue number5
Publication statusPublished - 1 Mar 2016


  • External resistance
  • Microbial electrolysis cell (MEC)
  • Microbial fuel cell (MFC)
  • Quantitative real-time PCR (qPCR)

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