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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Single Atom Ru Monolithic Electrode for Efficient Chlorine Evolution and Nitrate Reduction.

Yancai Yao1, Long Zhao1, Jie Dai1

  • 1School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.

Angewandte Chemie (International Ed. in English)
|August 30, 2022
PubMed
Summary

Researchers developed a novel single-atom electrode using ruthenium (Ru) atoms anchored to a titanium (Ti) support. This advanced electrode shows superior performance in chlorine evolution and nitrate reduction, paving the way for industrial electrocatalysis.

Keywords:
BifunctionalityChlorine Evolution ReactionInherent Oxide Anchoring StrategyNitrate Reduction ReactionSingle Atom Monolithic Electrode

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Advancing electrochemical technologies requires efficient lab-to-fab translation of electrode fabrication.
  • Single-atom electrodes offer high activity and selectivity due to maximized atom utilization.

Purpose of the Study:

  • To develop a scalable method for fabricating single-atom electrodes.
  • To investigate the electrocatalytic performance of isolated ruthenium (Ru) atoms on a monolithic titanium (Ti) support.

Main Methods:

  • An inherent oxide anchoring strategy was employed to immobilize ligand-free Ru atoms on a Ti support.
  • Electronic metal-support interactions were regulated to enhance atom anchoring.
  • Electrochemical chlorine evolution and nitrate reduction reactions were performed to evaluate catalytic activity.

Main Results:

  • The Ru single-atom electrode demonstrated a mass activity three orders of magnitude higher than commercial dimensionally stable anodes for chlorine evolution.
  • Exceptional selectivity for nitrate reduction to ammonia was achieved, with an unprecedented ammonia yield rate of 22.2 mol g⁻¹ h⁻¹ at -0.3 V.
  • Scalability was demonstrated, with electrodes successfully fabricated from 2x2 cm to 25x15 cm.

Conclusions:

  • The developed oxide anchoring strategy effectively fastens isolated Ru atoms, creating highly active and stable electrocatalysts.
  • The Ru single-atom monolithic electrode shows significant potential for industrial applications in electrocatalysis.
  • This work provides a viable pathway for the large-scale production of advanced single-atom electrocatalysts.