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Catalysis02:50

Catalysis

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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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Template-stabilized oxidic nickel oxygen evolution catalysts.

Nancy Li1, Thomas P Keane1, Samuel S Veroneau1

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138.

Proceedings of the National Academy of Sciences of the United States of America
|July 9, 2020
PubMed
Summary
This summary is machine-generated.

Stable oxygen evolution catalysts (OECs) were created using nickel and lead oxides (NiPbOx) for efficient performance in acidic conditions. This breakthrough enables new possibilities for electrochemical applications requiring robust and long-lasting catalysts.

Keywords:
acid-stable templatingelectrocatalysisrenewable energysolar to fuelswater-splitting catalysis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing earth-abundant oxygen evolution catalysts (OECs) with enhanced stability in acidic media is crucial for electrochemical applications.
  • Native nickel oxide (NiOx) catalysts lack the necessary stability in acidic environments, limiting their practical use.

Purpose of the Study:

  • To engineer stable NiPbOx films for efficient oxygen evolution reaction (OER) catalysis in acidic solutions.
  • To investigate the role of lead oxide as an acid-stable framework for embedded catalytic active sites.
  • To explore the mechanism of iron doping in nickel-based OECs under acidic conditions.

Main Methods:

  • Fabrication of NiPbOx films for OER catalysis.
  • Performance testing in acidic solutions (pH 2.5) with extended operation times (>20 h).
  • In situ X-ray absorption spectroscopy (XAS) and ex situ X-ray photoelectron spectroscopy (XPS) for material characterization.

Main Results:

  • NiPbOx films demonstrated stable OER catalysis for over 20 hours in pH 2.5 solutions, unlike rapidly dissolving NiOx films.
  • PbO2 in the NiPbOx lattice remained unperturbed, serving as an acid-stable conductive framework.
  • Fe doping in Ni OECs under acidic conditions enhanced catalytic activity, supporting a Lewis acid mechanism for Fe3+.

Conclusions:

  • Embedding active sites within an acid-stable metal-oxide framework, such as NiPbOx, is an effective strategy for creating durable OECs.
  • The stability and conductivity of the PbO2 framework are key to the performance of NiPbOx catalysts in acid.
  • The study provides insights into the catalytic mechanism of Fe-doped Ni OECs in acidic media, highlighting the importance of Lewis acid properties.