Enhanced methanol oxidation and CO tolerance using CeO2-added eggshell membrane-templated Pd network electrocatalyst

Abstract

Macroporous Pd and CeO 2 -added Pd network catalysts have been synthesized using eggshell membrane (ESM) as a template for enhanced methanol oxidation and CO tolerance. The microstructural characterization revealed a hierarchically ordered macroporous network of Pd reproducing the fibrous structure of ESM for a Pd-only catalyst, and a flower-like CeO 2 -decorated Pd morphological architecture for the CeO 2 -added Pd catalyst synthesized by a precipitation method. XRD patterns indicated Pd and CeO 2 phases with good crystallinity. The cyclic voltammetry studies showed an enhanced electrocatalytic activity for methanol oxidation in acidic aqueous medium. Because of the preferential formation of Ce-CO bonds over Pd-CO bonds, the incorporation of CeO 2 into Pd-based catalysts results in an increased CO tolerance, making it a robust catalyst for methanol oxidation in direct methanol fuel cells.

Palladium-ceria nanocatalyst for hydrogen oxidation in alkaline media: Optimization of the Pd–CeO2 interface

“…Ceria (CeO 2 ) is a well-known catalytic material, sometimes also used as a catalyst support [31]. In electrocatalysis, ceria has been employed in direct alcohol fuel cells due to its ability to promote the oxidation of the catalyst poisoning carbon monoxide produced in alcohol oxidation reactions [32][33][34][35]. It has been hypothesized that ceria promotes the formation of Pd-OH ad species which facilitates ethanol oxidation kinetics [35].…”

Influence of nanostructured ceria support on platinum nanoparticles for methanol electrooxidation in alkaline media

“…Ceria is a common catalyst support for Pt-based direct alcohol fuel cells because of its ability to oxidize the catalystpoisoning carbon monoxide produced in alcohol oxidation reactions. [18][19][20] Nanostructured ceria of various shapes (NPs, NRs, nanotubes and mesoporous structures) have been shown to enhance the catalytic activities of metal NPs towards carbon monoxide oxidation, the water gas shi reaction and reforming reactions at low temperatures. [21][22][23] The differences in their activities have been attributed to the ceria crystal plane facets, 24 density of oxygen vacancy sites 21 and crystallinity 25 of the ceria component.…”

Application of biowaste and nature-inspired (nano)materials in fuel cells

“…ESM was also demonstrated as a template to synthesize macroporous Pd and CeO 2 -containing Pd network catalysts. 198 The CeO 2 -containing Pd network catalyst was synthesized via the precipitation method. The CeO 2 -containing Pd catalyst possessed a flower-like morphology, which provided a large surface area for electrochemical methanol oxidation.…”