Details

Autor(en) / Beteiligte

• Li, Nancy
• Keane, Thomas P.
• Veroneau, Samuel S.
• Hadt, Ryan G.
• Hayes, Dugan
• Chen, Lin X.
• Nocera, Daniel G.

Titel

Template-stabilized oxidic nickel oxygen evolution catalysts

Ist Teil von

• Proceedings of the National Academy of Sciences - PNAS, 2020-07, Vol.117 (28), p.16187-16192

Ort / Verlag

United States: National Academy of Sciences

Erscheinungsjahr

2020

Link zum Volltext

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• Earth-abundant oxygen evolution catalysts (OECs) with extended stability in acid can be constructed by embedding active sites within an acid-stable metal-oxide framework. Here, we report stable NiPbOₓ films that are able to perform oxygen evolution reaction (OER) catalysis for extended periods of operation (>20 h) in acidic solutions of pH 2.5; conversely, native NiOₓ catalyst films dissolve immediately. In situ X-ray absorption spectroscopy and ex situ X-ray photoelectron spectroscopy reveal that PbO₂ is unperturbed after addition of Ni and/or Fe into the lattice, which serves as an acid-stable, conductive framework for embedded OER active centers. The ability to perform OER in acid allows the mechanism of Fe doping on Ni catalysts to be further probed. Catalyst activity with Fe doping of oxidic Ni OEC under acid conditions, as compared to neutral or basic conditions, supports the contention that role of Fe3+ in enhancing catalytic activity in Ni oxide catalysts arises from its Lewis acid properties.