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Related Concept Videos

Corrosion of Reinforcement01:27

Corrosion of Reinforcement

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The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
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The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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A TiN@C core-shell support for improving Pt catalyst corrosion resistance.

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Titanium nitride carbon composite supports enhance proton-exchange membrane fuel cell durability. The TiN@C material shows superior corrosion resistance compared to carbon alone, extending fuel cell lifespan.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Proton-exchange membrane fuel cells (PEMFCs) are crucial for clean energy, but support corrosion limits their development.
  • Developing durable and efficient electrode supports is essential for advancing PEMFC technology.

Purpose of the Study:

  • To engineer a novel composite support with enhanced corrosion resistance for PEMFCs.
  • To investigate the synergistic effects of titanium nitride and carbon on support stability.

Main Methods:

  • Fabrication of a TiN@C composite support with a TiN core and porous carbon shell.
  • Electrochemical testing of the TiN@C support's corrosion resistance at 1.2 V for 400 hours.
  • Analysis using X-ray photoelectron spectroscopy and density functional theory calculations.

Main Results:

  • The TiN@C composite support demonstrated significantly higher corrosion resistance than traditional carbon supports.
  • Titanium nitride's inherent stability and strong metal-support interactions (SMSI) between platinum and nitrogen contributed to improved performance.
  • The porous carbon nanolayer provided excellent conductivity.

Conclusions:

  • The TiN@C composite support offers a promising solution to overcome the challenge of support corrosion in PEMFCs.
  • This advanced material can substantially enhance the overall durability and operational lifespan of proton-exchange membrane fuel cells.