Stability Enhancement of Pd Catalysts by Compositing with Polypyrrole Layer for Polymer Electrolyte Fuel Cell Electrodes

Abstract

Pd catalyst composited with a conducting polymer of polypyrrole is prepared and investigated as a stable H 2 electrooxidation catalyst in an acidic condition. A significant stability enhancement of Pd by compositing electropolymerized polypyrrole can be observed and its mechanistic scheme for the stability is discussed through several electrochemical and physicochemical characterizations on the polypyrrole-composited Pd catalysts.

Oxidation of Benzyl Alcohol and Carbon Monoxide Using Gold Nanoparticles Supported on MnO2 Nanowire Microspheres

“…The slight peak shifts observed in the negative and positive scans after coating with PyPBI are clearly indicative of the surface coverage of 2 . Similar peak shifts were also observed in the Pt coating with other polymers 16. Quite interestingly, the ECSA value, which represent the accessible surface area for hydrogen, for 2 (44.8 m 2 g Pt −1 ) was shown to be identical to that of 1 (43.6 m 2 g Pt −1 ).…”

Correlation between theoretical descriptor and catalytic oxygen reduction activity of graphene supported palladium and palladium alloy electrocatalysts

“…Despite high kinetic activity and cost benefits over state of the art Pt catalysts, Pd based catalysts have not been used in the cathode of the most widely used acidic electrolyte PEMFC due to its inferior electrochemical instability compared to Pt [12,24,85]. The fundamental understanding of the stability issues of Pd based catalysts would be essential in order to further optimize the catalyst design and enhance their catalytic activity.…”

Synthesis and characterization of Pt–Pd nanoparticles with core-shell morphology: Nucleation and overgrowth of the Pd shells on the as-prepared and defined Pt seeds

“…for obtaining the high ORR activity [36,37]. At present, Pt or Pd based nanocatalysts are increasingly developed because they are highly active electrocatalysts in fuel cells, especially for the commercialization and realization of direct methanol fuel cells (DMFC) [38][39][40][41][42][43][44]. Thus, Pt-Pd nanocatalysts become a suitable choice of replacing Pt-Ru nanocatalysts in DMFCs because the cost of Pt-Ru nanocatalysts is much higher [45][46][47][48][49][50][51].…”

“…In order to improve their catalytic performance, new Pt-nanoparticles catalysts are developed [12]. Because of pure Pt-based catalyst of high cost, various kinds of Pt-based alloy and core-shell catalysts, ternary Pt-based catalysts, and even more various compositions have been developed and tested in proton exchange membrane fuel cells (PEMFCs) [3,12,[38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55].…”