The effect of supporting carbons on the gas phase synthesis of octahedral Pt₃Ni electrocatalysts with various H₂:CO ratios.

ABSTRACT: The gas phase synthesis of octahedral Pt₃Ni/C electrocatalysts using several carbon substrates (Ketjen black, Graphene, and Vulcan XC-72R) was investigated. Different carbon substrates altered the morphology and alloy of Pt₃Ni nanoparticles, with octahedral morphology and alloy metal preferentially developing on Ketjen black and Graphene, while spherical shape and bimetallic metal preferentially developing on Vulcan. Furthermore, the shape was shown to be regulated throughout the reduction process, with the H₂:CO ratio playing a crucial role in controlling octahedral morphology and carrying out the ORR activity. At a 1:3 H₂:CO ratio, the Pt₃Ni/Ketjen black exhibited the highest ORR activity for both mass activity (1.02 A mgPt^-1

SUBMITTER: Payattikul L 

PROVIDER: S-EPMC9307833 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature