Co²⁺, Fe²⁺, and Ni²⁺: Modifiers for Photocatalytic Deposition of Highly Active Pt on Graphene-Based Supports

This study focuses on photocatalytic syntheses, in which transition metal ions (Co2+, Fe2+, or Ni2+), as the hole scavengers and surface modifiers of partially reduced graphene oxide, PRGO, were utilized to photoreduce Pt4+. A pulsed UV reactor was used illuminate precursors. The electrostatic interaction between Ni2+) oxygen functional groups PRGO main parameter, proposed be reason controlling Pt4+ reduction Pt structure activity. alternative assumption managing oxidation states variation rates scavengers. electrocatalysts’ structural electrochemical characteristics revealed that utilizing cobalt-based scavenger caused a dominant growth phase particles at preferred positions with metallic improved electrocatalytic activities (ECSA value 191 m2·g–1 for Co2+ vs 141 127 Fe2+ Ni2+, respectively). Density theory (DFT) calculation, other hand, suggested greater affinity cobalt iron could detach more “O” from plane. Based DFT results, less vicinity gave an amorphous morphology facilitated hydrogen reaction (HOR).