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Related Concept Videos

Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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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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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Reactions01:27

Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Balancing Redox Equations02:58

Balancing Redox Equations

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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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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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Redox-Reversible Electrode Material for Direct Hydrocarbon Solid Oxide Fuel Cells.

Peng Qiu1, Xin Yang1, Wanhua Wang1

  • 1Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States.

ACS Applied Materials & Interfaces
|March 10, 2020
PubMed
Summary
This summary is machine-generated.

A novel double perovskite oxide, Sr2Co0.4Fe1.2Mo0.4O6-δ (SCFM), shows excellent performance as both cathode and anode materials for solid oxide fuel cells (SOFCs). This material offers enhanced stability and efficiency for hydrocarbon fuel utilization.

Keywords:
Ruddlesden−Popperalloy nanoparticlesdouble perovskitehydrocarbon fuelsredox reversibility

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Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Solid oxide fuel cells (SOFCs) offer direct hydrocarbon fuel utilization but face anode challenges like coking and sulfur poisoning with traditional nickel-based materials.
  • Developing stable and efficient anode and cathode materials is crucial for advancing SOFC technology.

Purpose of the Study:

  • To introduce a novel double perovskite oxide, Sr2Co0.4Fe1.2Mo0.4O6-δ (SCFM), as a versatile material for both cathode and anode applications in SOFCs.
  • To investigate the redox reversibility, catalytic activity, and conductivity of SCFM for improved SOFC performance.

Main Methods:

  • Synthesis and characterization of the double perovskite oxide SCFM.
  • Evaluation of SCFM's structural transformation under different atmospheres (reducing and oxidizing) at 900 °C.
  • Testing SCFM as both cathode and anode materials in SOFCs, assessing performance with hydrocarbon fuels and sulfur-containing fuels.

Main Results:

  • SCFM exhibits excellent redox reversibility, transforming between double perovskite and a composite with Co-Fe alloy nanoparticles.
  • SCFM demonstrates high catalytic activity for oxygen reduction reactions and possesses mixed ionic-electronic conductivity, making it suitable as a cathode.
  • As an anode, SCFM shows excellent performance and stability when directly oxidizing methane and operating with sulfur-containing fuels.

Conclusions:

  • The novel double perovskite oxide SCFM possesses outstanding redox reversibility, electrical conductivity, and catalytic properties.
  • SCFM's dual functionality as both cathode and anode material offers a promising solution for overcoming limitations in current solid oxide fuel cell technology.
  • The unique properties of SCFM open avenues for broad applications in advanced energy conversion systems.