In this paper, Pt nanodendrites are synthesized, and their use as an oxygen reduction catalyst in polymer electrolyte membrane fuel cells is examined. When the Pt nanoparticles are shape-controlled in a dendritic form, the Pt nanoparticles exhibit a high mass activity that is nearly twice as high as the commercial Pt/C catalyst for the oxygen reduction reaction. This high activity is only achieved when the Pt nanodendrites are supported on carbon. The unsupported Pt nanodendrites exhibit very poor catalytic activity due to the limited accessibility of the active sites in the catalyst layer of the fuel cells. Based on the durability study of Pt nanodendrites, however, the dendritic structure is not stable during repeated potential cycling test and its structure collapse is the primary reason for the performance loss in the fuel cells.
Bibliographical noteFunding Information:
This work was supported by the Priority Research Centers Program through the National Research Foundation of Korea ( 2009-0093823 ) and ( NRF-2009-C1AAA001-0092926 ) funded by the Ministry of Education, Science and Technology .
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology