Abstract
For fuel cells, to produce high-quality and low-platinum catalyst is a pressing technical problem. In this study, graphene cathode catalysts with controllable platinum content were decorated by pyrolyzing chloroplatinic acid under various process parameters to obtain a high catalytic activity and durability. The results show that platinum particles generated by pyrolyzing chloroplatinic acid are uniformly loaded on graphene without agglomeration. The average particle size of platinum particles is about 2.12 nm. The oxygen reduction reaction catalytic activity of catalyst samples first increases, then decreases with increasing platinum loading in cyclic voltammetry and LSV. Compared with the commercial Pt/C (20 wt% Pt) catalyst, the initial potential and the current density retention rate of the catalyst decorated with 8% platinum are 55 mV and 23.7% higher, respectively. From i-t curves, it was found that the stability of the catalyst prepared in this paper was improved compared with the commercial Pt/C catalyst. The catalysts prepared in the present research exhibits superior catalytic activity and stability.
Highlights
Fuel cells are of worldwide interest due to their advantages of emitting less pollution and their high energy-conversion rate; they are recognized as a green, efficient, clean power-generation technology
The peaks at 39.8, 46.3, 67.7, and 81.3 correspond to the (111), (200), (220), and 311) crystal planes of FCC Pt (PDF # 04–0,802). this indicates that chloroplatinic acid is pyrolyzed and reduced at 480 °C to form platinum
The results showed that the initial potential of commercial Pt/C was 0.048 V, which was lower than the initial potential of the prepared catalyst sample containing 8% platinum
Summary
Fuel cells are of worldwide interest due to their advantages of emitting less pollution and their high energy-conversion rate; they are recognized as a green, efficient, clean power-generation technology. Catalytic materials are one of the important components of such fuel cells. In the past few decades, many investigations have been undertaken on non-platinum-based cathode catalysts. Transition metal nitrogen-carbon catalysts have the advantages of low cost and high catalytic activity, the catalysts show the disadvantages of poor stability. Ru-based compounds are the most extensively studied cathode catalytic materials among transition metal chalcogenides, as a precious metal, Ru is scarce but expensive. Co-based transition metal chalcogenides are considered to be a potential material, it is difficult to meet requirements imposed on both high activity and good stability under the working
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