Pd3Au@Pt/C core-shell electroccatalysts with enhanced stability and activity for oxygen reduction reaction

Title
Pd3Au@Pt/C core-shell electroccatalysts with enhanced stability and activity for oxygen reduction reaction
Authors
이상영박희영정남기정영훈장인준류재윤안도천박일규박융호장종현유성종
Keywords
core-shell; electrochecatalyst; stability; activity; oxygen reduction reaction
Issue Date
2014-09
Publisher
international society of electrochemistry
Abstract
Pt-M alloy catalysts and non Pt(core) –Pt(shell) catalysts have been studied for decreasing of Pt amount and enhancing of oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells(PEMFCs). While it is important to enhance the activity of ORR, electrocatalyst durability for application is important. The durability of only Pt electrocatalyst has been reported that 40-60% reduction for accelerated durability test (ADT) of half cells. Thus, the interaction of between core and shell enhanced ORR activity and durability has been studied. Until present, core-shell electrocatalysts were synthesized through galvanic replacement method. But the troubles of this method are difficult bulk scale and catalyst synthesis. Thus, the chemical synthesis method that we have used, can be synthesized more easily. The electrocatalysts made through chemical method, we confirmed that structure and activity of core-shell electrocatalysts for transmission electron microscopy (TEM), Cyclic voltammetry measurements (CV), electrochemical polarization curve. Also the stability and durability of electrocatalysts were analyzed for between initial and after 10,000 cycles of CV, reduced carbon dioxide (CO2) peak, ORR, size distribution of TEM. To determine the best shell layers of electrocatalyst for durability, we conducted analysis using three factors. The first factor is the Pt dissolution of Pt shell after 10,000 cycles. The second factor is the structure and shape of between Pt and core. The other is the interaction of between core and shell for shell layers in this study.
URI
http://pubs.kist.re.kr/handle/201004/48162
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KIST Publication > Conference Paper
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