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• W2103191570 abstract "Abstract Microbial fuel cells (MFCs) show large cathodic overpotentials for the O 2 reduction reaction. The local cathode pH is important, as OH − ions accumulate on the catalyst surface, resulting in a Nernstian concentration overpotential. Herein, we explore how various relevant buffers affect cathode performance at neutral pH, by reducing the concentration overpotential. We show that NH 4 + buffer results in the best performance at current densities >10 A m −2 , owing to buffering of the local pH close to its p K a (ca. 9.2). With other buffers, the local pH increases to >12 at similar current densities. We also show the importance of diffusion in buffer transport. Increasing the buffer concentration or improving the hydrodynamic conditions leads to lower overpotentials. We also present a mathematical model that includes buffer diffusion, for use in predicting cathode polarization curves. Overall, our results point to the promise of reducing cathode overpotentials in MFCs using naturally available buffers." @default.
• W2103191570 created "2016-06-24" @default.
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• W2103191570 date "2014-07-25" @default.
• W2103191570 modified "2023-10-18" @default.
• W2103191570 title "Buffer p<i>K</i>_aand Transport Govern the Concentration Overpotential in Electrochemical Oxygen Reduction at Neutral pH" @default.
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• W2103191570 doi "https://doi.org/10.1002/celc.201402058" @default.
• W2103191570 hasPublicationYear "2014" @default.
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