Tungsten oxide as electrocatalyst for improved power generation and wastewater treatment in microbial fuel cell

ABSTRACT

Microbial fuel cell (MFC) is a device that oxidizes the organic matter present in wastewater and simultaneously generates electricity from it. For practical applications, the power production of MFCs needs to be enhanced and the use of novel anode and cathode catalyst can certainly help in this regard. Such a novel catalyst, WO₃, was explored as both anode and cathode catalyst in this study. Performance of MFCs was enhanced when WO₃ was used as an electrocatalyst. The maximum power density of MFC was increased by five times when WO₃ was used as anode catalyst and by four times when it was used as cathode catalyst as compared to control MFC using electrode without any catalyst. Almost six times increment in maximum power production of MFC was observed when WO₃ was used as catalyst on both the electrodes. Electrochemical analysis of WO₃ also proved that it could enhance the current density of the modified electrode owing to its electrochemical catalytic properties. Furthermore, chemical oxygen demand (COD) removal of MFC having WO₃ coated electrodes was also observed to be higher, thus suggesting an overall enhancement in the performance of MFC by the use of WO₃ as an electrocatalyst.

GRAPHICAL ABSTRACT

KEYWORDS:

• Catalyst
• extracellular electron transfer
• microbial fuel cell
• tungsten oxide
• wastewater treatment

Acknowledgements

The help received from Dr. Pritha Chatterjee during the initial experimentation planning is acknowledged.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by Department of Science and Technology, Government of India grant number DST/TSG/NTS/2015/99].