Pd3Au@Pt/C core-shell electroccatalysts with enhanced stability and activity for oxygen reduction reaction
- Pd3Au@Pt/C core-shell electroccatalysts with enhanced stability and activity for oxygen reduction reaction
- 이상영; 박희영; 정남기; 정영훈; 장인준; 류재윤; 안도천; 박일규; 박융호; 장종현; 유성종
- core-shell; electrochecatalyst; stability; activity; oxygen reduction reaction
- Issue Date
- international society of electrochemistry
- 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.
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