TY - JOUR
T1 - PtxCo1-x alloy NPs prepared by colloidal tool-box synthesis
T2 - the effect of de-alloying on the oxygen reduction reaction activity
AU - Spanos, Ioannis
AU - Rellán, César Pelegrín
AU - Altmann, Lena
AU - Baeumer, Marcus
AU - Arenz, Matthias
PY - 2014/6/5
Y1 - 2014/6/5
N2 - In the presented work we investigate the influence of de-alloying carbon supported PtxCo1-x alloy nanoparticles (NPs) on their oxygen reduction reaction (ORR) activity. In our study we used a modification of a recently developed colloidal synthesis approach in order to prepare NPs of similar size, i.e. around 2 nm in diameter, but varying initial Pt:Co ratios. The results show that using a surfactant is favorable to control the initial Pt:Co ratio. The initial composition of the catalyst however is lost upon introduction into an acid environment, i.e. the well-known effect of chemical de-alloying occurs. Interestingly, despite the fact that due to de-alloying almost all Co is removed from the PtxCo1-x NPs, a clear trend of increasing ORR activity with increasing initial Co content is observed. The results indicate that the process of chemical de-alloying is favorable for producing active ORR catalysts.
AB - In the presented work we investigate the influence of de-alloying carbon supported PtxCo1-x alloy nanoparticles (NPs) on their oxygen reduction reaction (ORR) activity. In our study we used a modification of a recently developed colloidal synthesis approach in order to prepare NPs of similar size, i.e. around 2 nm in diameter, but varying initial Pt:Co ratios. The results show that using a surfactant is favorable to control the initial Pt:Co ratio. The initial composition of the catalyst however is lost upon introduction into an acid environment, i.e. the well-known effect of chemical de-alloying occurs. Interestingly, despite the fact that due to de-alloying almost all Co is removed from the PtxCo1-x NPs, a clear trend of increasing ORR activity with increasing initial Co content is observed. The results indicate that the process of chemical de-alloying is favorable for producing active ORR catalysts.
U2 - 10.1016/j.ijhydene.2014.03.199
DO - 10.1016/j.ijhydene.2014.03.199
M3 - Journal article
SN - 0360-3199
VL - 39
SP - 9143
EP - 9148
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 17
ER -