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Lookup NU author(s): Taiwo Alaje,
Emeritus Professor Keith Scott
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In this work, Pd nanoparticles were supported on two types of three-dimensional cubic highly ordered mesoporous carbon (CMK-8) by the sodium borohydride reduction method and the activity of the Pd/CMK-8 electro-catalysts towards formic acid oxidation was evaluated and compared with that of commercial Pd/C (E-TEK) catalyst. The catalysts were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), cyclic voltammetry, and chronoamperometry. Cyclic voltammetry revealed Pd/CMK-8 with larger pores as being the most electroactive with a mass specific activity (mA mg(Pd)(-1)) of 486.4 that exceeded not only that of the Pd/C (E-TEK) (386.5 mA mg(Pd)(-1)) but also that of recently reported Pd/CNT (200 mA mg(Pd)(-1)), Pd/Graphene (210 mA mg(Pd)(-1)) and Pd/Vulcan XC 72 (193 mA mg(Pd)(-1)). As demonstrated with chronoamperometry, the larger pore Pd/CMK-8 also proved to be the most stable catalyst. This exceptional performance can be ascribed to the very high surface area and la3d symmetry that yields a relatively isotropic graphitized structure with a high conductivity. In addition, the open framework of the 3-D bicontinous channels and highly ordered mesopores allows for an advanced mass transfer characteristics. The results show that CMK-8 support would significantly improve the power output and stability of Pd-based electro-catalysts for formic acid oxidation. (C) 2012 Elsevier B.V. All rights reserved.
Author(s): Maiyalagan T, Nassr AA, Alaje TO, Bron M, Scott K
Publication type: Article
Publication status: Published
Journal: Journal of Power Sources
Print publication date: 10/04/2012
ISSN (print): 0378-7753
ISSN (electronic): 1873-2755
Publisher: Elsevier SA
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