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Related Concept Videos

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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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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Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells
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High-Performance Hydroxide Exchange Membrane Fuel Cell Comprising an Atomic Layer-Deposited Silver Cathode.

Jong Seon Park1, Beum Geun Seo1, Junmo Koo1

  • 1School of Mechanical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu Seoul 02841, Republic of Korea.

Nano Letters
|August 28, 2023
PubMed
Summary
This summary is machine-generated.

Atomic layer deposition (ALD) enabled the creation of a cost-effective, platinum-free catalyst for hydroxide exchange membrane fuel cells (HEMFCs). This novel Ag electrocatalyst achieved high performance, overcoming limitations in fuel cell electric vehicles (FCEVs).

Keywords:
PGM-free catalystatomic layer depositioncathodehydroxide exchange membrane fuel cellsilver

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Fuel cell electric vehicles (FCEVs) require cost-efficient, high-performance catalysts to compete with battery electric vehicles (BEVs).
  • Hydroxide exchange membrane fuel cells (HEMFCs) offer a promising alternative, but catalyst development remains a challenge.
  • Platinum-based catalysts are expensive, driving the need for alternative materials.

Purpose of the Study:

  • To develop a platinum-free cathode catalyst for HEMFCs using Atomic Layer Deposition (ALD).
  • To investigate the efficacy of silver (Ag) electrocatalysts fabricated via ALD for oxygen reduction reactions.
  • To assess the performance of ALD-Ag nanoparticles on carbon nanotubes (CNTs) for HEMFC applications.

Main Methods:

  • Fabrication of Ag electrocatalysts on CNTs using Atomic Layer Deposition (ALD).
  • Microstructural analysis to confirm nanoparticle distribution and step coverage.
  • Performance testing of the fabricated cathode in a hydroxide exchange membrane fuel cell (HEMFC) at 65 °C.

Main Results:

  • ALD successfully created Ag nanoparticles with excellent step coverage on porous CNTs.
  • The Pt-free HEMFC cathode demonstrated high oxygen reduction activity.
  • A peak power density of 2154 mW mgAg-1 was achieved in an alkaline environment.

Conclusions:

  • ALD is a viable technique for manufacturing highly active, low-cost electrocatalysts.
  • ALD-Ag/CNTs show significant potential for high-performance HEMFCs.
  • This approach offers a cost-effective alternative to platinum catalysts in fuel cell technology.