Issue 46, 2013

Graphene–cobaltite–Pd hybrid materials for use as efficient bifunctional electrocatalysts in alkaline direct methanol fuel cells

Abstract

Hybrid materials comprising of Pd, MCo2O4 (where M = Mn, Co or Ni) and graphene have been prepared for use as efficient bifunctional electrocatalysts in alkaline direct methanol fuel cells. Structural and electrochemical characterizations were carried out using X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, chronoamperometry and cyclic, CO stripping, and linear sweep voltammetries. The study revealed that all the three hybrid materials are active for both methanol oxidation (MOR) and oxygen reduction (ORR) reactions in 1 M KOH. However, the Pd–MnCo2O4/GNS hybrid electrode exhibited the greatest MOR and ORR activities. This active hybrid electrode has also outstanding stability under both MOR and ORR conditions, while Pt- and other Pd-based catalysts undergo degradation under similar experimental conditions. The Pd–MnCo2O4/GNS hybrid catalyst exhibited superior ORR activity and stability compared to even Pt in alkaline solutions.

Graphical abstract: Graphene–cobaltite–Pd hybrid materials for use as efficient bifunctional electrocatalysts in alkaline direct methanol fuel cells

Supplementary files

Article information

Article type
Paper
Submitted
14 Sep 2013
Accepted
02 Oct 2013
First published
30 Oct 2013

Phys. Chem. Chem. Phys., 2013,15, 20333-20344

Graphene–cobaltite–Pd hybrid materials for use as efficient bifunctional electrocatalysts in alkaline direct methanol fuel cells

C. S. Sharma, R. Awasthi, R. N. Singh and A. S. K. Sinha, Phys. Chem. Chem. Phys., 2013, 15, 20333 DOI: 10.1039/C3CP53880J

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