Journal
NATURE MATERIALS
Volume 20, Issue 2, Pages 208-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41563-020-0775-8
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Funding
- Danish DFF [4184-00332]
- Villum Center for the Science of Sustainable Fuels and Chemicals [9455]
- Danish National Research Foundation Center for High-Entropy Alloys Catalysis (CHEAC)
- Swiss National Science Foundation (SNSF) [200021_184742]
- BMBF [FKZ 03VP06451]
- French National Research Agency (ANR) as part of the 'Investissements d'Avenir' programme [ANR10-EQPX45]
- DFG [FOR2213]
- Federal Ministry of Education and Research (BMBF, ECatPEMFC) [FKZ 03SF0539]
- Villum Foundation [VKR00015416]
- DANSCATT
- Danish Agency for Science and Higher Education
- DOE Office of Science [DE-AC02-06CH11357]
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A new concept of self-supported platinum-cobalt oxide networks has been proposed, combining high specific activity with a high ECSA, promising a stable fuel-cell operation. This concept exceeds the US Department of Energy targets for Pt-related ORR mass activity.
A high oxygen reduction reaction activity can usually be realized by increasing platinum specific activity at the expense of active surface area. Self-supported platinum-cobalt-oxide networks combining high activity and surface area now promise a stable fuel-cell operation. 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.
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