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Related Concept Videos

Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
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The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
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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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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
09:02

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Published on: April 27, 2018

Heterostructured electrode with concentration gradient shell for highly efficient oxygen reduction at low

Wei Zhou1, Fengli Liang, Zongping Shao

  • 1Division of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia.

Scientific Reports
|February 23, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel 3D heterostructured electrode with a concentration gradient shell, significantly enhancing oxygen surface exchange rates for improved electrochemical performance and stability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Science

Background:

  • Oxide heterostructures are crucial for optical, catalytic, and electrochemical applications due to unique interfacial properties.
  • Tailoring oxide interfaces can lead to enhanced material performance in various technological domains.

Purpose of the Study:

  • To fabricate a novel three-dimensional (3D) heterostructured electrode with a concentration gradient shell.
  • To investigate the impact of the concentration gradient shell on the electrochemical performance, specifically oxygen surface exchange rate and interfacial resistance.

Main Methods:

  • Fabrication of a 3D heterostructured electrode using a porous Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-δ) (BSCF) backbone.
  • Creation of a concentration gradient shell (BSCF-D) on the BSCF backbone via microwave-plasma treatment.
  • Electrochemical impedance spectroscopy (EIS) to analyze oxygen surface exchange rate and interfacial resistance.

Main Results:

  • The fabricated BSCF-D electrode exhibited a ~250% enhancement in oxygen surface exchange rate compared to the pristine BSCF.
  • The heterostructured electrode demonstrated a low interfacial resistance of 0.148 Ω cm² at 550°C.
  • The electrode maintained stable electrochemical performance after 200 hours of heating treatment.

Conclusions:

  • The concentration gradient shell significantly improves the electrochemical performance of oxide heterostructures.
  • The microwave-plasma treatment offers a facile method for preparing advanced heterostructured ceramic materials.
  • This approach holds promise for developing high-performance materials for electrochemical devices and other ceramic applications.