Membraneless ethanol fuel cell Pt–Sn–Re nano active catalyst on a mesoporous carbon support

Membraneless ethanol fuel cell Pt–Sn–Re nano active catalyst on a mesoporous carbon support M. Priya Department of Chemistry, School of Basic Sciences, Vels Institute of Science, Technology & Advanced Studies, Chennai, Tamilnadu, India http://orcid.org/0000-0001-7830-7174 B. Muthukumaran Department of Chemistry, Presidency College (Autonomous), Chennai 600 005, India

Addition of Re into the binary Pt–Sn catalyst increases electrical performance for ethanol oxidation reaction. Ternary based Pt–Sn–Re/MC (80 : 15 : 05) enhances the performance compared to the mono and bimetallic catalysts in the ethanol oxidation reaction in a membraneless fuel cell.
Herein, we report, for the first-time, mesoporous carbon-supported binary and ternary catalysts with different atomic ratios of Pt/MC (100), Pt–Sn/MC (50 : 50), Pt–Re/MC (50 : 50), Pt–Sn–Re/MC (80 : 10 : 10) and Pt–Sn–Re/MC (80 : 115 : 05) prepared using a co-impregnation reduction method as anode components for membraneless ethanol fuel cells (MLEFLs). Mechanistic and structural insights into binary Pt–Sn/MC, Pt–Re/MC and ternary Pt–Sn–Re/MC catalysts were obtained using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX) methods. In particular, chemical characterization via cyclic voltammetry, CO stripping voltammetry and chronoamperometry indicated that Pt–Sn–Re/MC (80 : 15 : 05) had better dynamics toward ethanol oxidation than Pt–Sn–Re/MC (80 : 10 : 10), Pt–Sn/MC (50 : 50) and Pt–Re/MC (50 : 50) catalysts. In terms of the single cell performance of the prepared catalysts, Pt–Sn–Re/MC (80 : 15 : 05) (31.5 mW cm −2 ) showed a higher power density and current density than Pt–Sn–Re/MC(80 : 10 : 10), Pt–Re/MC (50 : 50) and Pt–Sn/MC (50 : 50) at room temperature. The addition of Re into the binary Pt–Sn catalyst improved its electrical performance for ethanol oxidation in a membraneless ethanol fuel cell. As a result, the ternary-based Pt–Sn–Re/MC (80 : 15 : 05) catalyst demonstrated enhanced performance compared to monometallic and bimetallic catalysts in the ethanol oxidation reaction in a membraneless fuel cell.
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