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DOE OSTI · 1637574

Template-stabilized oxidic nickel oxygen evolution catalysts

Li, Nancy·Keane, Thomas P.·Veroneau, Samuel S.·Hadt, Ryan G. (ORCID:0000000160261358)·Hayes, Dugan (ORCID:0000000341715179)·Chen, Lin X. (ORCID:0000000284506687)·Nocera, Daniel G. (ORCID:000000015055320X)
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Abstract

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. In this paper, we report stable NiPbO x 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 NiO x catalyst films dissolve immediately. In situ X-ray absorption spectroscopy and ex situ X-ray photoelectron spectroscopy reveal that PbO 2 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 Fe 3+ in enhancing catalytic activity in Ni oxide catalysts arises from its Lewis acid properties.

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25 ENERGY STORAGE30 DIRECT ENERGY CONVERSION36 MATERIALS SCIENCE37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRYacid-stable templatingelectrocatalysisrenewable energysolar to fuelswater-splitting catalysis

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Li, Nancy, Keane, Thomas P., Veroneau, Samuel S., Hadt, Ryan G. (ORCID:0000000160261358), Hayes, Dugan (ORCID:0000000341715179), Chen, Lin X. (ORCID:0000000284506687), Nocera, Daniel G. (ORCID:000000015055320X). 2020-07-07. Template-stabilized oxidic nickel oxygen evolution catalysts. https://doi.org/10.1073/pnas.2001529117

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