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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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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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A negative alloying energy may indicate long-term stability for platinum (Pt)-alloys used as cathode catalysts in fuel cells. This finding, supported by density functional theory, suggests improved durability for these crucial components.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Platinum-based alloys are critical cathode catalysts in low-temperature fuel cells.
  • Long-term stability of these catalysts is essential for efficient and durable fuel cell operation.
  • Dissolution of catalyst components can lead to performance degradation.

Purpose of the Study:

  • To investigate the relationship between alloying energy and catalyst stability.
  • To identify descriptors for predicting the long-term durability of platinum-alloys.
  • To explore the applicability of this relationship beyond platinum.

Main Methods:

  • Utilizing density functional theory (DFT) calculations.
  • Analyzing the correlation between alloying energy and diffusion barriers of minority components.
  • Examining alloys based on platinum (Pt), aluminum (Al), and palladium (Pd).

Main Results:

  • A negative alloying energy correlates with increased diffusion barriers for minority components.
  • Alloys exhibiting negative alloying energy demonstrate potential for improved long-term stability.
  • This trend was observed not only for Pt-alloys but also for Al- and Pd-based alloys.

Conclusions:

  • Negative alloying energy can serve as a descriptor for the long-term stability of cathode catalysts.
  • Understanding alloying energy provides insights into catalyst durability mechanisms.
  • The findings have implications for designing more stable and efficient fuel cell catalysts.