TY - JOUR
T1 - Carbon supported Pt-Y2O3 and Pt-Gd2O3 nanoparticles prepared via carbonyl chemical route towards oxygen reduction reaction
T2 - Kinetics and stability
AU - Luo, Yun
AU - Estudillo-Wong, Luis Alberto
AU - Alonso-Vante, Nicolas
N1 - Publisher Copyright:
© 2016 Hydrogen Energy Publications LLC
PY - 2016/11/16
Y1 - 2016/11/16
N2 - The Pt-M2O3/C (M = Y and Gd) catalysts were synthesized via carbonyl chemical route, and heat-treated at 300 °C. Both catalysts are nanoparticulated with a face-centered cubic (fcc) structure with no secondary phase present as revealed by X-ray diffraction (XRD) patterns similar to Pt/C, generated in the same way. Data analyses of Pt-M2O3/C XRD patterns via the Williamson–Hall method were performed. The stacking fault, and micro-strain values increased with respect to Pt/C catalyst. The transmission electron microscopy (TEM) further revealed that nano-particles are homogeneously dispersed in both Pt/C and Pt-M2O3/C (M = Y and Gd). The mean particle size is close, ca. 3.4 nm for Pt/C, ca. 4.1 nm for Pt-Y2O3/C and ca. 3.6 nm for Pt-Gd2O3/C sample. Although the surface electrochemical studies (cyclic and CO-stripping voltammograms) showed similar Pt surface behavior, the kinetics of oxygen reduction reaction (ORR) on Pt-M2O3/C (M = Y and Gd) catalysts was higher than the homemade Pt/C and commercial Pt/C catalysts (20 wt. %, Johnson Matthey). After 6000 potential cycles (0.6–1.0 V vs. RHE) of accelerated stability test (AST), the remaining Pt active surface (based on hydrogen underpotential deposition region) and kinetic current density (at 0.9 V vs. RHE) in Pt-M2O3/C (M = Y and Gd) catalysts were higher than the reference Pt/C, and commercial Pt/C catalysts. These findings assess the positive effect of M2O3 (M = Y and Gd) in improving the activity and stability of Pt NPs towards ORR.
AB - The Pt-M2O3/C (M = Y and Gd) catalysts were synthesized via carbonyl chemical route, and heat-treated at 300 °C. Both catalysts are nanoparticulated with a face-centered cubic (fcc) structure with no secondary phase present as revealed by X-ray diffraction (XRD) patterns similar to Pt/C, generated in the same way. Data analyses of Pt-M2O3/C XRD patterns via the Williamson–Hall method were performed. The stacking fault, and micro-strain values increased with respect to Pt/C catalyst. The transmission electron microscopy (TEM) further revealed that nano-particles are homogeneously dispersed in both Pt/C and Pt-M2O3/C (M = Y and Gd). The mean particle size is close, ca. 3.4 nm for Pt/C, ca. 4.1 nm for Pt-Y2O3/C and ca. 3.6 nm for Pt-Gd2O3/C sample. Although the surface electrochemical studies (cyclic and CO-stripping voltammograms) showed similar Pt surface behavior, the kinetics of oxygen reduction reaction (ORR) on Pt-M2O3/C (M = Y and Gd) catalysts was higher than the homemade Pt/C and commercial Pt/C catalysts (20 wt. %, Johnson Matthey). After 6000 potential cycles (0.6–1.0 V vs. RHE) of accelerated stability test (AST), the remaining Pt active surface (based on hydrogen underpotential deposition region) and kinetic current density (at 0.9 V vs. RHE) in Pt-M2O3/C (M = Y and Gd) catalysts were higher than the reference Pt/C, and commercial Pt/C catalysts. These findings assess the positive effect of M2O3 (M = Y and Gd) in improving the activity and stability of Pt NPs towards ORR.
KW - Carbonyl chemical route
KW - Oxygen reduction reaction
KW - Pt nanoparticles
KW - Rare-earth oxides
KW - Surface defect
UR - http://www.scopus.com/inward/record.url?scp=85027957740&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2016.02.102
DO - 10.1016/j.ijhydene.2016.02.102
M3 - Artículo
AN - SCOPUS:85027957740
SN - 0360-3199
VL - 41
SP - 19601
EP - 19609
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 43
ER -
