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Atomically deviated Pd-Te nanoplates boost methanol-tolerant fuel cells.

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  • 1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China.

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|August 25, 2020
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Summary
This summary is machine-generated.

Developing advanced catalysts for direct methanol fuel cells (DMFCs) is crucial. New palladium-tellurium (Pd-Te) hexagonal nanoplates show high oxygen reduction reaction (ORR) activity and excellent methanol tolerance, improving fuel cell performance.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Methanol crossover in direct methanol fuel cells (DMFCs) significantly degrades oxygen reduction reaction (ORR) performance and fuel efficiency.
  • Existing catalysts struggle to achieve both high ORR activity and effective resistance to methanol poisoning.

Purpose of the Study:

  • To develop novel electrocatalysts that overcome the limitations of methanol crossover in alkaline DMFCs.
  • To investigate catalysts with enhanced ORR activity and superior methanol tolerance.

Main Methods:

  • Synthesis of Palladium-Tellurium (Pd-Te) hexagonal nanoplates (HPs) with a specific Pd20Te7 phase.
  • Electrochemical characterization of Pd-Te HPs/C compared to commercial Pt/C.
  • Density Functional Theory (DFT) calculations to elucidate the catalytic mechanism.

Main Results:

  • Pd-Te HPs/C exhibited significantly higher ORR performance and exceptional methanol tolerance compared to commercial Pt/C.
  • The unique atomic arrangement in Pd-Te HPs deviated from standard hexagonal close-packing, contributing to improved properties.
  • DFT calculations confirmed that Pd-Te HPs break the linear scaling relationship between OOH* and OH* adsorption, optimizing ORR activity while suppressing methanol oxidation.

Conclusions:

  • The developed Pd-Te HPs represent a promising class of electrocatalysts for DMFC applications.
  • These catalysts offer a practical solution for concurrent high ORR activity and excellent methanol tolerance.
  • The findings pave the way for more efficient and durable fuel cell technologies.