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Network Covalent Solids02:18

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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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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Remarkable solid-state proton conduction in sulfur- and nitrogen-functionalized few-layer graphene.

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Sulfur- and nitrogen-functionalized graphene shows high proton conductivity, matching Nafion. This advanced material offers excellent stability for fuel cell applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Proton exchange membranes are crucial for fuel cells.
  • Nafion is a leading material but has limitations.
  • Developing alternative proton conductors is essential.

Purpose of the Study:

  • To investigate the proton conductivity of sulfur- and nitrogen-functionalized few-layer graphene.
  • To evaluate the stability and performance of this novel material.

Main Methods:

  • Synthesis of sulfur- and nitrogen-functionalized few-layer graphene.
  • Proton conductivity measurements at 95 °C and 95% relative humidity (RH).
  • Long-term stability testing over one month.

Main Results:

  • Achieved a proton conductivity of 0.0865 S cm-1, comparable to Nafion.
  • Demonstrated a low activation barrier for proton conduction.
  • Exhibited exceptional material stability over extended testing periods.
  • Observed acid-base synergism and excess charge carriers due to functionalization.

Conclusions:

  • Sulfur- and nitrogen-functionalized graphene is a promising alternative proton conductor.
  • The material's properties are suitable for fuel cell applications.
  • Functionalization strategy enhances proton conduction and stability.