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Controlled Doping of Electrocatalysts through Engineering Impurities.

Se-Ho Kim1, Su-Hyun Yoo1, Sangyong Shin2

  • 1Max-Planck Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237, Düsseldorf, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|May 6, 2022
PubMed
Summary

Boron doping in palladium nanocatalysts enhances hydrogen oxidation reaction (HOR) activity in alkaline conditions for anion-exchange membrane fuel cells (AEMFCs). This impurity engineering approach offers a pathway to cost-effective, platinum-free catalysts for the hydrogen economy.

Keywords:
atom probe tomographyhydrogen-oxidation reactionimpurity engineeringwet-chemical synthesis

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Anion-exchange membrane fuel cells (AEMFCs) offer a carbon-emission-free power source.
  • High pH operation in AEMFCs can improve power density but is limited by sluggish hydrogen oxidation reaction (HOR) kinetics.
  • Developing efficient, low-cost catalysts is crucial for AEMFC commercialization.

Purpose of the Study:

  • To investigate the effect of boron (B) doping on palladium (Pd) nanocatalysts for HOR activity in alkaline media.
  • To develop platinum-free catalysts for next-generation AEMFCs.
  • To understand the mechanism of B-doping on Pd catalyst performance.

Main Methods:

  • Synthesis of B-doped Pd nanocatalysts using wet-chemistry.
  • Electrochemical evaluation of HOR activity in alkaline conditions.
  • Ab initio calculations to study H- and OH-adsorption on B-doped Pd.

Main Results:

  • Unexpected B ingress into Pd nanocatalysts was observed and controlled.
  • B-doped Pd nanocatalysts exhibited significantly enhanced HOR activity in alkaline conditions.
  • Ab initio calculations confirmed that B-doping modifies H and OH adsorption, improving catalytic performance.

Conclusions:

  • Impurity engineering by B-doping is an effective strategy to enhance Pd catalyst activity for HOR in AEMFCs.
  • Pt-free B-doped Pd catalysts offer a promising solution for cost-effective and stable electrochemical energy conversion.
  • This approach supports the development of the hydrogen economy by enabling economically viable AEMFCs.