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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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Multimetallic core/interlayer/shell nanostructures as advanced electrocatalysts.

Yijin Kang1, Joshua Snyder, Miaofang Chi

  • 1Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.

Nano Letters
|October 10, 2014
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Summary
This summary is machine-generated.

Novel core-shell electrocatalysts (Ni@Au@PtNi) achieve a balance of activity and durability for oxygen reduction reactions. This design enhances electrocatalyst performance and longevity.

Keywords:
Core−shellactivitydurabilityelectrocatalysisnanoparticleoxygen reduction reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • High-performance electrocatalysts are vital for energy conversion technologies.
  • Achieving a balance between catalytic activity and operational durability remains a key challenge.
  • Atomic structure and compositional gradients are critical design principles for advanced electrocatalysts.

Purpose of the Study:

  • To design and synthesize a novel core-shell electrocatalyst with enhanced activity and durability.
  • To investigate the synergistic effects of a multimetallic composition on electrocatalytic performance.
  • To evaluate the electrocatalyst's efficacy for the oxygen reduction reaction (ORR).

Main Methods:

  • Synthesis of a Ni@Au@PtNi core-interlayer-shell electrocatalyst.
  • Characterization of the material's atomic structure and composition.
  • Electrochemical testing of the oxygen reduction reaction (ORR) performance and durability.

Main Results:

  • The Ni@Au@PtNi core-shell structure demonstrated an optimal balance of activity and durability.
  • Synergistic effects between Au interlayer and Ni/PtNi shell contributed to enhanced performance.
  • Electrocatalysts exhibited high intrinsic and mass activities for ORR with minimal activity loss (<10%) after 10,000 potential cycles.

Conclusions:

  • The Ni@Au@PtNi core-shell architecture represents a promising strategy for developing advanced electrocatalysts.
  • Subsurface gold and nickel interactions significantly modify the electronic structure of the platinum-nickel shell, improving performance.
  • This design offers a pathway to highly active and durable electrocatalysts for energy applications.