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Related Experiment Video

Updated: Jan 20, 2026

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
09:12

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Programmable Exposure of Pt Active Facets for Efficient Oxygen Reduction.

Guanzhi Wang1, Zhenzhong Yang2, Yingge Du2

  • 1NanoScience Technology Center, Department of Materials Science and Engineering, Energy Conversion and Propulsion Cluster, University of Central Florida, Orlando, FL, 32826, USA.

Angewandte Chemie (International Ed. in English)
|September 3, 2019
PubMed
Summary

New platinum-nickel porous films (PtNi PFs) offer efficient oxygen reduction reaction (ORR) catalysis with minimal platinum. This breakthrough utilizes a novel templating method to maximize exposed active sites for enhanced performance.

Keywords:
dynamic oxygen-bubble templatefacet selectivitylow Pt loadingoxygen reductionporous films

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient oxygen reduction reaction (ORR) catalysts are crucial for energy conversion technologies.
  • Reducing platinum (Pt) content in catalysts is economically and environmentally important.
  • Controlling catalyst morphology and active site exposure is key to enhancing performance.

Purpose of the Study:

  • To design efficient ORR catalysts with significantly reduced platinum content.
  • To develop a method for creating porous platinum-nickel films (PtNi PFs) with exposed active sites.
  • To investigate the effect of surface species and morphology on ORR activity.

Main Methods:

  • Combined electrochemical bottom-up (electrodeposition) and top-down (anodization) processes.
  • Utilized a dynamic oxygen-bubble template (DOBT) controlled by square-wave potential.
  • Adjusted surface-bounded species (e.g., hydroxyl) via anodic voltage to influence oxygen adsorption.

Main Results:

  • Successfully fabricated PtNi PFs with tunable morphology and exposed Pt active facets.
  • Achieved a PtNi PF enriched in Pt(111) facets (Pt$_{3.5\%}$ Ni PF) using the DOBT method.
  • Demonstrated prominent ORR activity with an onset potential of 0.92 V (vs. RHE) at ultra-low Pt loading (0.015 mg cm$^{-2}$).

Conclusions:

  • The developed combined electrodeposition and anodization approach effectively produces efficient ORR catalysts with low Pt content.
  • The DOBT method is a viable strategy for controlling catalyst morphology and maximizing active Pt surface area.
  • The Pt$_{3.5\%}$ Ni PF exhibits excellent ORR performance, highlighting its potential for practical applications.