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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Molecular and Ionic Solids02:54

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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.
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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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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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Oxidation Numbers03:14

Oxidation Numbers

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In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
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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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Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
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High-Temperature CO2 Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects.

Yuefeng Song1,2, Xiaomin Zhang1, Kui Xie3

  • 1State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.

Advanced Materials (Deerfield Beach, Fla.)
|July 9, 2019
PubMed
Summary
This summary is machine-generated.

High-temperature CO2 electrolysis in solid-oxide electrolysis cells (SOECs) converts CO2 into fuels, aiding emission reduction and renewable energy storage. This technology offers higher efficiency than low-temperature methods.

Keywords:
CO2 electrolysisperovskitessolid oxide electrolysis cells

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Rising CO2 emissions necessitate innovative reduction strategies.
  • Renewable energy sources require effective energy storage solutions.
  • High-temperature electrolysis offers advantages over low-temperature CO2 reduction.

Purpose of the Study:

  • To review the fundamental mechanisms and materials for high-temperature CO2 electrolysis in SOECs.
  • To summarize degradation issues and introduce fuel-assisted SOEC advancements.
  • To outline future research challenges and prospects in this field.

Main Methods:

  • Review of historical development and fundamental mechanisms of SOECs for CO2 electrolysis.
  • Analysis of cathode, electrolyte, and anode materials.
  • Comprehensive summary of degradation phenomena at electrodes and interfaces.

Main Results:

  • High-temperature CO2 electrolysis in SOECs effectively activates the CO2 molecule for fuel conversion.
  • SOECs demonstrate higher current density and energy efficiency compared to low-temperature methods.
  • Degradation issues in SOECs are identified and summarized.

Conclusions:

  • High-temperature CO2 electrolysis in SOECs is a promising technology for CO2 emission reduction and renewable energy storage.
  • Advancements in materials and understanding degradation are crucial for commercialization.
  • Fuel-assisted SOECs and further research are key to overcoming current challenges.