TY - JOUR
T1 - Self-supported Pt-CoO networks combining high specific activity with high surface area for oxygen reduction
AU - Sievers, Gustav W.
AU - Jensen, Anders W.
AU - Quinson, Jonathan
AU - Zana, Alessandro
AU - Bizzotto, Francesco
AU - Oezaslan, Mehtap
AU - Dworzak, Alexandra
AU - Kirkensgaard, Jacob J.K.
AU - Smitshuysen, Thomas Erik Lyck
AU - Kadkhodazadeh, Shima
AU - Juelsholt, Mikkel
AU - Jensen, Kirsten M.Ø.
AU - Anklam, Kirsten
AU - Wan, Hao
AU - Schäfer, Jan
AU - Čépe, Klára
AU - Escribano, Maria Escudero
AU - Rossmeisl, Jan
AU - Quade, Antje
AU - Brüser, Volker
AU - Arenz, Matthias
PY - 2021
Y1 - 2021
N2 - Several concepts for platinum-based catalysts for the oxygen reduction reaction (ORR) are presented that exceed the US Department of Energy targets for Pt-related ORR mass activity. Most concepts achieve their high ORR activity by increasing the Pt specific activity at the expense of a lower electrochemically active surface area (ECSA). In the potential region controlled by kinetics, such a lower ECSA is counterbalanced by the high specific activity. At higher overpotentials, however, which are often applied in real systems, a low ECSA leads to limitations in the reaction rate not by kinetics, but by mass transport. Here we report on self-supported platinum-cobalt oxide networks that combine a high specific activity with a high ECSA. The high ECSA is achieved by a platinum-cobalt oxide bone nanostructure that exhibits unprecedentedly high mass activity for self-supported ORR catalysts. This concept promises a stable fuel-cell operation at high temperature, high current density and low humidification.
AB - Several concepts for platinum-based catalysts for the oxygen reduction reaction (ORR) are presented that exceed the US Department of Energy targets for Pt-related ORR mass activity. Most concepts achieve their high ORR activity by increasing the Pt specific activity at the expense of a lower electrochemically active surface area (ECSA). In the potential region controlled by kinetics, such a lower ECSA is counterbalanced by the high specific activity. At higher overpotentials, however, which are often applied in real systems, a low ECSA leads to limitations in the reaction rate not by kinetics, but by mass transport. Here we report on self-supported platinum-cobalt oxide networks that combine a high specific activity with a high ECSA. The high ECSA is achieved by a platinum-cobalt oxide bone nanostructure that exhibits unprecedentedly high mass activity for self-supported ORR catalysts. This concept promises a stable fuel-cell operation at high temperature, high current density and low humidification.
U2 - 10.1038/s41563-020-0775-8
DO - 10.1038/s41563-020-0775-8
M3 - Journal article
C2 - 32839587
VL - 20
SP - 208
EP - 213
JO - Nature Materials
JF - Nature Materials
SN - 1476-1122
ER -