Self-supported Pt–CoO networks combining high specific activity with high surface area for oxygen reduction
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- Self-supported Pt–CoO networks combining high specific activity with high surface area for oxygen reduction_(accepted_version)
Accepted author manuscript, 716 KB, PDF document
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 language | English |
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Journal | Nature Materials |
Volume | 20 |
Pages (from-to) | 208–213 |
Number of pages | 8 |
ISSN | 1476-1122 |
DOIs | |
Publication status | Published - 2021 |
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