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Related Concept Videos

Electrochemical Cells01:28

Electrochemical Cells

Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not electrons—to...
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Heterogeneous Catalysis

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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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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Nonprecious Core-Shell Catalysts for Durable High-Performance Water Electrolysis.

Qihao Li1, Meixue Hu1, Saptarshi Das2

  • 1Department of Chemistry and Chemical Biology,Cornell University,Ithaca,New York 14853,United States.

Journal of the American Chemical Society
|June 1, 2026
PubMed
Summary
This summary is machine-generated.

Developing cost-effective, non-precious metal electrocatalysts for the oxygen evolution reaction (OER) is crucial. This study introduces a novel Ni@FeCo catalyst with a metallic Ni core and an active oxide shell, demonstrating high performance and stability in anion exchange membrane water electrolyzers (AEMWEs).

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Platinum-group metals (PGMs) are effective electrocatalysts but are expensive, hindering large-scale applications.
  • Alkaline systems allow for cheaper transition metal catalysts, but achieving high stability for the oxygen evolution reaction (OER) with non-PGMs remains difficult.

Purpose of the Study:

  • To develop a cost-effective, durable, and highly active non-precious metal electrocatalyst for the oxygen evolution reaction (OER).
  • To investigate the structural and electronic properties of a novel Ni@FeCo catalyst under operating conditions in anion exchange membrane water electrolyzers (AEMWEs).

Main Methods:

  • Synthesis of metallic Ni catalysts with a Co- and Fe-rich shell (Ni@FeCo).
  • Electrochemical testing in anion exchange membrane water electrolyzers (AEMWEs).
  • Operando X-ray characterizations, scanning transmission electron microscopy (STEM), and electron energy loss spectroscopy (EELS) to analyze catalyst structure and composition.

Main Results:

  • The Ni@FeCo catalyst achieved excellent performance in AEMWEs, reaching 10 A cm-2 at 2.18 V.
  • Operando characterizations confirmed the formation of an active Ni-Fe-Co spinel oxide shell while the Ni core remained metallic.
  • The catalyst demonstrated long-term stability, operating continuously for over 1700 hours.

Conclusions:

  • The developed Ni@FeCo metal-core/oxide-shell heterostructure is a promising non-precious metal electrocatalyst for OER.
  • This catalyst design offers efficient electron transport and high OER activity with remarkable stability in AEMWEs.
  • The study presents a viable strategy for designing advanced nonprecious metal electrocatalysts for water electrolysis.