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Self-assembled multicomponent Pd6 aggregates showing low-humidity proton conduction.

Dipak Samanta1, Partha Sarathi Mukherjee

  • 1Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore-560 012, India. psm@ipc.iisc.ernet.in.

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Summary

New discrete molecular aggregates show high proton conductivity at low humidity, comparable to Nafion. These findings are significant for developing advanced fuel cell materials.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Proton conductivity is crucial for fuel cell performance.
  • Current materials like Nafion face limitations under low humidity conditions.
  • Developing novel materials with high proton conductivity at low humidity is an active research area.

Purpose of the Study:

  • To synthesize and characterize new discrete molecular aggregates.
  • To investigate the proton conductivity of these aggregates under varying humidity levels.
  • To compare their performance with existing fuel cell materials.

Main Methods:

  • Template-free three-component self-assembly process.
  • Synthesis of two specific Palladium-6 (Pd6) molecular aggregates.
  • Proton conductivity measurements at 300 K and low relative humidity (~46%).
  • Activation energy analysis.

Main Results:

  • Two discrete Pd6 molecular aggregates (1 and 2) were successfully synthesized.
  • Aggregate 1 exhibited a proton conductivity of 0.78 × 10⁻³ S cm⁻¹.
  • Aggregate 2 showed a proton conductivity of 0.22 × 10⁻³ S cm⁻¹.
  • Both aggregates demonstrated low activation energy, comparable to Nafion.

Conclusions:

  • The synthesized Pd6 molecular aggregates represent novel discrete architectures.
  • These materials exhibit very high proton conductivity at low relative humidity.
  • Their performance suggests potential as advanced materials for fuel cells.