In:
Angewandte Chemie International Edition, Wiley, Vol. 60, No. 29 ( 2021-07-12), p. 15821-15826
Kurzfassung:
The instability and expense of anodes for water electrolyzers with acidic electrolytes can be overcome through the implementation of a cobalt‐iron‐lead oxide electrocatalyst, [Co–Fe–Pb]O x , that is self‐healing in the presence of dissolved metal precursors. However, the latter requirement is pernicious for the membrane and especially the cathode half‐reaction since Pb 2+ and Fe 3+ precursors poison the state‐of‐the‐art platinum H 2 evolving catalyst. To address this, we demonstrate the invariably stable operation of [Co–Fe–Pb]O x in acidic solutions through a cobalt‐selective self‐healing mechanism without the addition of Pb 2+ and Fe 3+ and investigate the kinetics of the process. Soft X‐ray absorption spectroscopy reveals that low concentrations of Co 2+ in the solution stabilize the catalytically active Co(Fe) sites. The highly promising performance of this system is showcased by steady water electrooxidation at 80±1 °C and 10 mA cm −2 , using a flat electrode, at an overpotential of 0.56±0.01 V on a one‐week timescale.
Materialart:
Online-Ressource
ISSN:
1433-7851
,
1521-3773
DOI:
10.1002/anie.202104123
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2021
ZDB Id:
2011836-3
ZDB Id:
123227-7