Durable Marimo-like carbon support for Platinum nanoparticle catalyst in polymer electrolyte fuel cell

Platinum nanocluster catalysts supported on Marimo carbon via scalable dry deposition synthesis

“…4(b) and (d) on KB. Because the reported sizes of Pt catalysts synthesized in the liquid phase 32,45 are similar to or larger than the size in this study, the results indicate that the DiPET method enables us to fabricate a smaller Pt catalyst on carbon material supports.…”

“…Pt NPs were loaded on MC or KB in liquid phase synthesis under a wet process. As previously reported, 32,33,45 an aqueous solution of chloroplatinic acid and citric acid was added and mixed in an aqueous solvent in which powders of MC or KB were dispersed, and the mixed solution was nally reduced with sodium borohydride to grow Pt NPs on the surface of MC or KB. Aer the supernatant solution was removed by centrifugation, the precipitation products composed of Pt particles on MC(Pt-NP(w)/MC) or KB(Pt-NP(w)/KB) were further used to fabricate the electrode.…”

“…The working electrodes were prepared using four types of Pt-NC(d)/MC, Pt-NC(d)/KB, Pt-NP(w)/MC, and Pt-NP(w)/KB. 32,33,45 First, catalyst inks were prepared by mixing 18.5 mg of the carbon-supported catalysts with 19 mL of deionized water, 6.0 mL of 2-propanol, and diluted ionomer (5 wt% Naon) solution. The amount of Naon solution was 33 and 100 mL for Pt-NC(NP)/MC and Pt-NC(NP)/KB, respectively.…”

“…In the evaluation of cell performance using the fabricated MEAs, current and voltage (I-V) measurements were performed for PEFCs. The I-V measurements were performed at a cell temperature of 80 C. Humidied hydrogen gas (200 mL min À1 , 100% relative humidity (RH) at 80 C) and humidied air (200 mL min À1 , 100% RH at 70 C) were supplied to the anode and cathode, respectively, 45 and gas utilization is approximately 70% at the anode and 40% at the cathode. 4(a)-(d).…”

“…For MC, the immobilization site is an edge of stacked graphene sheets, where carbon nanolaments of MC grow radially from diamond oxide in a stacked cup shape. 32,45 The stacked graphene edges appear to exhibit high selectivity for immobilizing Pt catalysts. For KB, in contrast, the immobilization sites of the mainly hexagonal structure of the graphite surface on KB 23 is not as active as the edge of the stacked graphene in MC, because KB has a porous carbon structure.…”