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Related Concept Videos

Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Reliability and Validity01:29

Reliability and Validity

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Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.
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Standard Electrode Potentials03:02

Standard Electrode Potentials

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
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New, Efficient, and Reliable Air Electrode Material for Proton-Conducting Reversible Solid Oxide Cells.

Daoming Huan, Nai Shi, Lu Zhang

  • 1National Synchrotron Radiation Laboratory, University of Science and Technology of China , Hefei 230026, P. R. China.

ACS Applied Materials & Interfaces
|December 29, 2017
PubMed
Summary

A new air electrode material, SrEu2Fe1.8Co0.2O7-δ (SEFC), enhances the reliability of proton-conducting reversible solid oxide cells (P-RSOCs). This stable SEFC material ensures efficient operation in both fuel cell and electrolysis modes, crucial for renewable energy storage.

Keywords:
air electrodeelectrochemical propertylong-term stabilitynovel Ruddlesden−Popper oxideproton-conducting reversible solid oxide cells

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Reversible solid oxide cells (RSOCs) are key for renewable energy storage but suffer from poor reliability in proton-conducting RSOCs (P-RSOCs) due to air electrode degradation from steam.
  • Traditional air electrode materials are susceptible to decay in the humid environments required for P-RSOC operation.

Purpose of the Study:

  • To design and implement a novel, highly stable, and efficient air electrode material for P-RSOCs.
  • To address the critical challenge of air electrode degradation in P-RSOCs caused by steam exposure.

Main Methods:

  • Synthesis and characterization of a layered perovskite oxide, SrEu2Fe1.8Co0.2O7-δ (SEFC).
  • Structural analysis using X-ray diffraction and High-angle annular dark-field scanning transmission electron microscopy.
  • Long-term performance testing of P-RSOCs with the SEFC air electrode in both fuel cell and electrolysis modes under various humid conditions.

Main Results:

  • SEFC exhibits a unique layered structure with specific Sr and Eu atom arrangements, reducing its reactivity with steam.
  • P-RSOCs with SEFC demonstrated stable and smooth switching between fuel cell and electrolysis modes over 135 hours.
  • A record stability of over 230 hours was achieved in electrolysis cell mode, significantly outperforming previous benchmarks.
  • SEFC showed superior catalytic activity compared to traditional La0.6Sr0.4Co0.2Fe0.8O3-δ air electrodes.

Conclusions:

  • The novel SEFC air electrode material offers exceptional stability and efficiency for P-RSOCs, overcoming key limitations.
  • SEFC's unique structure mitigates steam-induced degradation, paving the way for reliable P-RSOC applications.
  • This advancement positions P-RSOCs as a more viable component in sustainable energy systems.