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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Manipulating Electrocatalysis using Mosaic Catalysts.

Yuting Luo1, Sum Wai Chiang2, Lei Tang1

  • 1Shenzhen Geim Graphene Center (SGC) Tsinghua-Berkeley Shenzhen Institute (TBSI) and Tsinghua Shenzhen International Graduate School (TSIGS) Tsinghua University Shenzhen 518055 P. R. China.

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Summary
This summary is machine-generated.

Researchers developed a mosaic catalyst with spatially isolated active areas to boost electrocatalysis efficiency. This novel structure significantly enhances activity for reactions like hydrogen evolution, offering a new design strategy for heterogeneous catalysts.

Keywords:
catalystscatalytic activityelectrocatalysisgas-liquid-solid interfacehydrogen evolution

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Efficient electrocatalysis at gas-liquid-solid interfaces is crucial but challenging.
  • Improving catalyst activity often involves modifying electronic properties through chemical composition and physical features.

Purpose of the Study:

  • To develop a novel catalyst structure, termed mosaic catalyst, for enhanced electrocatalytic performance.
  • To investigate the impact of spatially isolated active areas on catalyst activity and efficiency.

Main Methods:

  • Fabrication of mosaic catalysts with periodically distributed active sites.
  • Electrocatalytic testing for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).
  • Characterization of catalyst structure and performance, including specific activity and current densities.

Main Results:

  • Mosaic platinum (Pt) catalysts exhibited 11 times higher specific activity for HER compared to uniform Pt films.
  • Mosaic catalysts demonstrated superior current densities over commercial Pt/C and uniform Pt films.
  • The strategy proved effective for other catalysts (e.g., PtS) and reactions (e.g., OER).

Conclusions:

  • Mosaic catalysts significantly enhance electrocatalytic activity due to improved mass transferability and local electric field strength.
  • Catalyst occupation ratio is a key factor in determining performance.
  • Spatial structure manipulation offers a new paradigm for designing efficient heterogeneous catalysts.