Pt/Graphene has been prepared by polyol method using pre-functionalized graphene and Pt salt solution, hexachloroplatinic acid. Electrochemical studies of the Pt supported onto graphene showed improved performance for hydrogen oxidation reaction and methanol oxidation reaction compared to state-of-the-art Pt/C catalyst. A thermal treatment applied to the catalysts improved the catalytic activity and stability of Pt/Graphene catalyst showing an electrochemical surface area of 58m2.g-1 and the stability was found 3-fold higher than the Pt/C conventional catalyst. The cyclic voltammetry measurements showed that the Pt/Graphene catalyst lost only 20% of the Pt initial ECSA, whereas the degradations of Pt /C catalyst was quite high showing 65% loss. The Pt/Graphene catalyst also exhibited a higher performance in the methanol electrooxidation for the promotion of C–H breaking and COad tolerance and good stability as well. Due to the homogenous distribution of Pt particles on the graphene as well as the availability of these surfaces for hydrogen adsorption and desorption processes, Pt/Graphene was reported to have 2-fold greater electrochemical performance towards methanol oxidation than Pt/C. Additionally, the findings contribute to improved mass movement in the catalyst layer. According to this research, the oxygenation groups and graphitization both have a dual role in the catalytic activity.
A significant step in commercializing zinc-air batteries is the development of a low platinum-group metal (PGM) concentration, high catalytic activity, and effective electrocatalyst for the oxygen evolution process. A nitrogen-doped carbon stabilized Pt-Co bimetallic nanoparticle (Pt@Co-NC-900) with very low Pt content (2 wt.%) was successfully produced using a metal-organic framework (MOF) templated technique. The as-developed Pt@Co-NC-900 demonstrates exceptional catalytic activity and long-term durability, exceeding commercial RuO2 catalysts and many previously reported catalysts with significant PGM content, attributed to its low overpotential of 223 mV. Using an N-containing MOF template, this research proposed a new approach for developing cost-effective and multifunctional catalysts.
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