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Related Concept Videos

Semiconductors01:22

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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High Temperature Fabrication of Nanostructured Yttria-Stabilized-Zirconia YSZ Scaffolds by In Situ Carbon Templating Xerogels
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Remarkable Ionic Conductivity in a LZO-SDC Composite for Low-Temperature Solid Oxide Fuel Cells.

Zhengwen Tu1, Yuanyuan Tian1, Mingyang Liu1

  • 1Key Laboratory of Ferro and Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, China.

Nanomaterials (Basel, Switzerland)
|September 28, 2021
PubMed
Summary

Semiconductor-ionic composites of zinc oxide (ZnO) and samarium-doped ceria (SDC) show promise for solid oxide fuel cells (SOFCs). The 5LZO-5SDC composite achieved high power density and ionic conductivity at 550 °C.

Keywords:
Li-doped ZnOSOFCscomposite electrolytehigh ionic conductivityinterfacial conduction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Ionic conduction in multifunctional semiconductors offers new pathways for solid oxide fuel cell (SOFC) electrolytes.
  • Lithium-doped zinc oxide (LZO) shows potential, but its electrolyte capabilities can be further enhanced.

Purpose of the Study:

  • To improve the electrolyte performance of LZO by creating semiconductor-ionic composites with Sm0.2Ce0.8O1.9 (SDC).
  • To investigate the electrochemical properties and ionic conductivity of LZO-SDC composites for low-temperature SOFC applications.

Main Methods:

  • Fabrication of LZO-SDC composites with varying mass ratios.
  • Testing of SOFCs utilizing the composite electrolytes at low operating temperatures.
  • Electrochemical and electrical analysis, including ionic conductivity measurements and interface inspection.

Main Results:

  • The 5LZO-5SDC composite demonstrated a peak power density of 713 mW cm-2 and open circuit voltages (OCVs) of 1.04 V at 550 °C.
  • Enhanced ionic conductivity of 0.16 S cm-1 at 550 °C was achieved, surpassing pure LZO and SDC.
  • The composite exhibited hybrid proton (H+) and oxygen ion (O2-) conduction, with a predominant H+ contribution.

Conclusions:

  • LZO-SDC composites are effective electrolytes for low-temperature SOFCs.
  • Enrichment of oxygen vacancies at the LZO-SDC hetero-interface significantly boosts ionic conductivity.
  • Semiconductor-ionic materials offer a promising route for developing advanced electrolytes for efficient SOFCs.