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Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
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Interfacial Push-Pull Dynamics Enable Rapid Had Desorption for Enhanced Formate Electrooxidation.

Zheng Tang1, Lanlan Shi1, Ningning Dai2

  • 1State Key Laboratory of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China.

ACS Applied Materials & Interfaces
|June 26, 2024
PubMed
Summary

This study introduces a novel catalyst for efficient formate electrocatalytic conversion in alkaline fuel cells. The new palladium/phosphorus-doped titanium dioxide (Pd/TiO2-P) catalyst enhances hydrogen desorption, significantly boosting performance.

Keywords:
adsorbed hydrogenelectron-rich Pdformate electrooxidationhydrogen migrationpush−pull effect

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Area of Science:

  • Electrocatalysis
  • Materials Science
  • Energy Conversion

Background:

  • Formate electrocatalytic conversion is crucial for fuel cells.
  • Adsorbed hydrogen (Had) hinders formate oxidation in alkaline media.
  • Developing efficient catalysts for alkaline formate oxidation is essential.

Purpose of the Study:

  • To overcome the challenge of adsorbed hydrogen (Had) inhibition in formate electrocatalytic conversion.
  • To design a catalyst that promotes efficient desorption and relocation of Had.
  • To enhance the catalytic activity of palladium-based catalysts in alkaline environments.

Main Methods:

  • Anchoring palladium (Pd) nanoparticles on a phosphorus-doped TiO2 substrate (TiO2-P).
  • Utilizing an interfacial push-pull effect to manage Had.
  • Investigating the electronic properties of Pd nanoparticles and their interaction with the TiO2-P support.

Main Results:

  • The Pd/TiO2-P catalyst demonstrated a mass activity of 4.38 A mgPd−1.
  • Achieved a 1.83-fold improvement in catalytic performance compared to Pd/TiO2.
  • Successfully promoted "push-pull" mechanism for Had desorption and relocation.

Conclusions:

  • The developed Pd/TiO2-P catalyst effectively suppresses Had adsorption, enhancing formate electrocatalytic conversion.
  • The interfacial push-pull strategy offers a scalable pathway for improving Pd-based catalysts in alkaline media.
  • This work provides significant advancements for fuel cell applications utilizing formate as a fuel.