Self-supported Pt-CoO networks combining high specific activity with high surface area for oxygen reduction

Gustav W. Sievers*, Anders W. Jensen, Jonathan Quinson, Alessandro Zana, Francesco Bizzotto, Mehtap Oezaslan, Alexandra Dworzak, Jacob J.K. Kirkensgaard, Thomas Erik Lyck Smitshuysen, Shima Kadkhodazadeh, Mikkel Juelsholt, Kirsten M.Ø. Jensen, Kirsten Anklam, Hao Wan, Jan Schäfer, Klára Čépe, Maria Escudero Escribano, Jan Rossmeisl, Antje Quade, Volker BrüserMatthias Arenz*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

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.
Original languageEnglish
JournalNature Materials
Volume20
Pages (from-to)208-213
ISSN1476-1122
DOIs
Publication statusPublished - 2021

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