Preparation of platinum catalysts on multi-walled carbon nanotubes by deposition-precipitation method for cathode in microbial fuel cells
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Abstract
Microbial fuel cell (MFC) is a technology for simultaneous wastewater treatment and electricity production. Bacteria in wastewater are able to convert organic matter into carbon dioxide, water and energy. In this study, Pt catalysts on multi-walled carbon nanotubes with carboxyl group (Pt/MWCNTs-COOH) were prepared by deposition-precipitation (DP) method with varies pH, refluxing temperature and refluxing time. The morphology and dispersed of Pt were characterized by field emission scanning electron microscope coupled with energy dispersive x-ray (FESEM-EDX) and transmission electron microscope (TEM). The results showed that the optimal conditions for DP were at pH 7, refluxing temperature 70 oC and refluxing time 120 min. As results, Pt catalysts prepared on MWCNTs-COOH by DP method exhibited small size (2-3 nm) and highly uniform. Therefore, we expect that the Pt/MWCNTs-COOH will increase oxidation reduction reaction and improve electricity production in MFC.
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