Controlled Fabrication of Pt Nanocauliflowers on PEDOT Support and Their Superior Electrocatalytic Activity of Methanol Oxidation Reaction
To reduce the usage of Pt catalyst in (monolayer(s) of Pt catalyst) DMFC or PEMFC, galvanic displacement reaction technique was chosen for the decoration of Pt nanocatalyst in PEDOT (Scheme). Non-precious metal nanoparticles such as Cu and Co were electrochemically deposited on PEDOT and were galvanically replaced by Pt nanoparticles as monolayer coverage.
Formation of Pt nanocauliflowers on nanofibrillar morphology of PEDOT support was found to be an alternative to carbon support.
Various loading (14.91µg/cm2, 26.85 µg/cm2, 32.51µg/cm2, 34.93µg/cm2, and 42.10µg/cm2) of Pt monolayer(s) were achieved on PEDOT and tested for electrocatalytic activity of methanol oxidation reaction (MOR) (Fig.1C). MOR was found to be enhanced by six orders of magnitude compared to direct deposition of Pt nanoparticles. SEM results clearly indicate the formation of Pt nanocauliflowers on nanofibrillar morphology of PEDOT (Fig.1B). Other characterizations like FT-IR, XRD and AFM were carried out to confirm the interactions of Pt nanocatalysts with polymer matrices, Pt facets, surface morphology and synergistic effect of catalyst support. Further, TEM results confirm the size of Pt nanoparticles in the range of 8-30 nm. Fabrication of Pt nanocatalysts on PEDOT by GDR of Cu has superior electrocatalytic performance of MOR. This Pt nanocauliflower-PEDOT catalyst will provide additional option to design and fabrication of catalysts for DMFC/PMFC.
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