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• W4386852588 abstract "There has been a global shift in energy production emphasizing the reduction of fossil fuels by the augmentation of more renewable energy. Proton-exchange membrane fuel cells (PEMFC) and anion-exchange membrane fuel cells (AEMFC) can mitigate a need for fossil fuels and provide an alternative route of hydrogen-based energy production. Fuel cells utilize a catalyst at both the cathode and anode to increase the overall kinetics of the redox reactions and enhance the cell performance. 1 Current fuel cell technology employs a platinum based catalyst due to its efficiency and robust performance in both alkaline and acidic environments. 1,2 The drawbacks associated with Pt-based catalysts are centered around its economic viability and its affinity towards surface poisoning. 1 A catalyst using platinum nanoparticles (PtNPs) loaded onto a graphene support can address some of the aforementioned drawbacks. 1 To maximize the electrocatalytic activity of the PtNPs – all aspects of the PtNPs catalyst must be optimized, which includes the optimization of the support material. The effect that the different commercially available heteroatom-doped graphene had on the activity of the PtNPs was investigated during this study. The PtNPs were synthesized using the citrate method, which produces ≤ 5 nm size particles. Our study confirmed that the choice of doped graphene support has an effect on the overall activity of PtNPs. The results were confirmed via a comparison with PtNPs supported on Vulcan XC-72R carbon. All Pt catalysts supported on the doped graphene showed an improvement in the oxygen reduction reaction (ORR) half-wave potentials ( E 1/2 ) over PtNPs on Vulcan XC-72R carbon (Fig. 1A); with the nitrogen-doped graphene exhibiting the greatest improvements in the half-wave potential with the E 1/2 value of 0.85 V vs. RHE as compared to the 0.77 V of the Pt/C. A comparison of the Tafel slopes (Fig. 1B) confirmed that the transfer of the first electron was the rate-determining step for all of the Pt catalysts supported on doped graphene as all Tafel slopes were around -120 mV per decade. This has been confirmed in literature with Pt on various carbon supports. 2 Figure 1. A) Comparison of RDE polarization curves for oxygen reduction on Pt/NGr (pink), Pt/SGr (green) and Pt/N-PGr (blue) with Pt/C (black) at 1900 rpm in a O 2 -saturated 0.1 M HClO 4 solution ( v = 10 mV s −1 ). B) Mass transfer corrected Tafel plots derived from A References: (1) Holton, O. T.; Stevenson, J. W. The Role of Platinum in Proton Exchange Membrane Fuel Cells. Platin. Met. Rev. 2013 , 57 (4), 259–271. https://doi.org/10.1595/147106713X671222. (2) Hussain, S.; Erikson, H.; Kongi, N.; Sarapuu, A.; Solla-Gullón, J.; Maia, G.; Kannan, A. M.; Alonso-Vante, N.; Tammeveski, K. Oxygen Reduction Reaction on Nanostructured Pt-Based Electrocatalysts: A Review. Int. J. Hydrog. Energy 2020 , 45 (56), 31775–31797. https://doi.org/10.1016/j.ijhydene.2020.08.215. Figure 1" @default.
• W4386852588 created "2023-09-20" @default.
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• W4386852588 date "2023-08-28" @default.
• W4386852588 modified "2023-09-27" @default.
• W4386852588 title "The Effect of Heteroatom-Doped Graphene Supports on the PtNPs Electrocatalytic Activity for ORR" @default.
• W4386852588 doi "https://doi.org/10.1149/ma2023-01552708mtgabs" @default.
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