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Multiscale Synergistic Design of High-Performance Electrocatalysts for Alkaline Hydrogen Evolution.

Dunyuan Jin1, Yirong Zhai1, Yuanze Huang1

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Small (Weinheim an Der Bergstrasse, Germany)
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Summary

A new catalyst, CuRu₁-1/Ni, enhances hydrogen evolution reaction (HER) kinetics in anion exchange membrane water electrolysis (AEMWE). This advanced catalyst boosts efficiency and stability for clean hydrogen production.

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CuRu single atom alloyTip effectalkaline hydrogen evolution reactionanion exchange membrane water electrolysis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Anion exchange membrane water electrolysis (AEMWE) is promising for energy storage due to high current density and cost advantages.
  • The hydrogen evolution reaction (HER) kinetics are a bottleneck in AEMWE, limiting overall efficiency.
  • Developing efficient catalysts is crucial for advancing AEMWE technology.

Purpose of the Study:

  • To engineer a multiscale catalyst (CuRu₁-1/Ni) for improved HER kinetics in AEMWE.
  • To optimize electronic structure and surface effects for enhanced hydrogen adsorption and hydroxyl desorption.
  • To investigate the catalyst's performance and stability for practical AEMWE applications.

Main Methods:

  • Synthesis of CuRu single-atom alloy nanosheets on Ni-wrapped Cu nanowires (CuRu₁-1/Ni).
  • Characterization using in situ Raman spectroscopy, CO stripping, and alkali metal ion probe experiments.
  • Performance evaluation through electrochemical measurements and finite element simulations.

Main Results:

  • The CuRu₁-1/Ni catalyst demonstrated optimized hydrogen adsorption and rapid adsorbed hydroxyl (OHad) desorption.
  • Achieved an overpotential of 30 mV at 10 mA cm⁻², a Tafel slope of 30.2 mV dec⁻¹, and a mass activity 12-fold higher than Pt/C.
  • Exhibited excellent stability, reaching a current density of 1 A cm⁻² in AEMWE.

Conclusions:

  • Multiscale engineering of CuRu₁-1/Ni effectively addresses HER kinetic limitations in AEMWE.
  • The catalyst's synergistic electronic interactions and tip effect significantly enhance catalytic activity and stability.
  • This development represents a significant advancement in efficient and cost-effective hydrogen production via AEMWE.