Performance of Ag2O/Ag Electrode as Cathodic Electron Acceptor in Microbial Fuel Cell

doi:10.1007/s40195-017-0616-1

Abstract

Abstract:

An Ag₂O/Ag electrode was prepared through the electrochemical oxidation of sterling silver. This electrode was used as a cathodic electron acceptor in a microbial fuel cell (MFC). The Ag₂O/Ag electrode was characterized by scanning electron microscopy, X-ray powder diffraction and linear sweep voltammetry. The maximum voltage output of the MFC with the Ag₂O/Ag cathode was maintained at between 0.47 and 0.5 V in 100 cycles, indicating the good regenerative capacity of the Ag₂O/Ag electrode. The overpotential loss for silver oxide was 0.021-0.006 V, and the maximum power output, open circuit potential and short circuit current of the MFC were 1.796 W m^-3, 0.559 V and 9.3375 A m^-3, respectively. The energy required for electrochemical reoxidation ranged from 40% to 55% of the energy produced by the MFC. Results indicated that the Ag₂O/Ag electrode could be used as a cathodic electron acceptor in MFCs with excellent stability.

Key words: Ag₂O/Ag electrode, Cathodic electron acceptor, Microbial fuel cell, Regenerative capacity, Overpotential loss, Stability

Hong-Yan Dai, Hui-Min Yang, Xuan Jian, Xian Liu, Zhen-Hai Liang. Performance of Ag₂O/Ag Electrode as Cathodic Electron Acceptor in Microbial Fuel Cell[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(12): 1243-1428.

Figures/Tables 4

Fig. 1 SEM micrographs of Ag and the Ag2O/Ag electrode

Fig. 2 XRD patterns of the Ag2O/Ag electrode a, used silver oxide electrode b, sterling silver c

Fig. 3 LSV results (current density vs potential) of Ag and the Ag2O/Ag electrode

Fig. 4 Performance of MFC with the regenerated Ag2O/Ag cathode: a the voltage output of MFC in three consecutive cycles with a 1000-Ω loading, b maximum voltage output of MFC with the regenerated Ag2O/Ag cathode in 100 cycles, c potentials of the microbial anode and the Ag2O/Ag cathode, d power density

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Performance of Ag₂O/Ag Electrode as Cathodic Electron Acceptor in Microbial Fuel Cell

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