Journal
ELECTROCHIMICA ACTA
Volume 176, Issue -, Pages 1338-1342Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.07.057
Keywords
Direct methanol fuel cell; 3D hybrid structure; Graphene sheets; CeO2; Pt nanoparticles
Categories
Funding
- National Natural Science Foundation of China [21266018]
- Science and technology projects of Science and Technology Department of Inner Mongolia Autonomous Region, P.R. China [20110401, 20130409]
- Natural Science Foundation of Inner Mongolia, P.R. China [2010MS0218]
- Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region [NJYT-15-A04]
- Ministry of Science and Technology China-South Africa Joint Research Program [CS08-L15]
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A designed rod-shaped CeO2 (NRCeO2) was successfully synthesized using an in situ growth method on graphene sheets (GNs), which act as a spacer to prevent graphene from stacking. When graphene sheets with rod-shaped CeO2 and embellished with Pt nanoparticles are stacked on one another, a three-dimensional (3D) layer-by-layer Pt-NRCeO2/GNs composite structure is created. For the TEM and SEM characterization, the 3D structure has been confirmed. In the electrochemical tests, the as-designed 3D Pt-NRCeO2/GNs catalyst shows the highest ESA value (72.6 m(2) g(-1)) and largest catalytic current density (498 mA mg(-1)) for methanol oxidation compared with other catalysts. Because of the effect of the rodshaped CeO2, which acts as a spacer to prevent graphene stacking, a large amount of Pt particles are exposed to the electrolyte solution. The designed 3D Pt-NRCeO2/GNs composite structure is an efficient method to improve the electrocatalytic performance. (C) 2015 Elsevier Ltd. All rights reserved.
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