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Related Experiment Video

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Atomic-level tungsten doping triggered low overpotential for electrocatalytic water splitting.

Mengmeng Jin1, Jiewei Li1, Jingchang Gao1

  • 1Key Laboratory of Flexible Electronics & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, 5 XinMofan Road, Nanjing 210009, China.

Journal of Colloid and Interface Science
|November 25, 2020
PubMed
Summary

Adding tungsten (W) to cobalt hydroxide carbonate (CCH) significantly enhances its oxygen evolution reaction (OER) activity. This W-doped CCH requires less energy for efficient water splitting, making it a promising electrocatalyst.

Keywords:
ElectrochemistryHeterometal dopingOxygen evolution reactionWater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient electrocatalysts are crucial for water splitting to produce clean energy.
  • Cobalt hydroxide carbonate (CCH) is a potential electrocatalyst, but its performance needs improvement.

Purpose of the Study:

  • To investigate the effect of tungsten (W) doping on the oxygen evolution reaction (OER) activity of cobalt hydroxide carbonate (CCH).
  • To explore W-doped CCH as an electrocatalyst for efficient water splitting.

Main Methods:

  • Atomic doping of cobalt hydroxide carbonate (CCH) with W6+ to create W-CCH.
  • Electrochemical characterization to evaluate OER activity and water splitting performance.

Main Results:

  • 5 at % W doping reduced the OER overpotential of CCH by 95.3 mV at 15 mA cm-2.
  • Current density increased by 2.8 times at 1.65 V with W doping.
  • A W-CCH-based electrolyzer achieved 10 mA cm-2 for full water splitting at a low potential of 1.65 V.

Conclusions:

  • W6+ acts as an active site for O2- adsorption, enhancing charge transfer during electrocatalysis.
  • W6+ doping is an effective strategy to boost the performance of transition-metal carbonate hydroxides for water splitting.