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Flexible Bifunctional Electrode for Alkaline Water Splitting with Long-Term Stability.

Abhijit Ganguly1, Ruairi J McGlynn1, Adam Boies2

  • 1School of Engineering, Ulster University, Belfast BT15 1AP, Northern Ireland, U.K.

ACS Applied Materials & Interfaces
|March 1, 2024
PubMed
Summary

This study presents a novel carbon nanotube ribbon and NiO quantum dot electrode for efficient alkaline water-splitting. The bifunctional electrode demonstrates excellent stability and low energy requirements for green hydrogen production.

Keywords:
alkaline electrolyzer cellbifunctional and flexible electrodehydrogen evolution reaction (HER)long-term OWS stabilitymacroscopically assembled carbon nanotube (CNT) ribbonsnickel oxides (NiO) quantum dots (QDs)overall water splitting (OWS) in alkaline mediaoxygen evolution reaction (OER)plasma-induced nonequilibrium electrochemistry (PiNE)water electrolysis

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Area of Science:

  • Materials Science and Engineering
  • Electrochemistry
  • Renewable Energy Technologies

Background:

  • Efficient and earth-abundant bifunctional electrocatalysts are crucial for advancing electrochemical water-splitting devices.
  • Current research focuses on developing cost-effective and scalable electrode materials for clean energy generation.

Purpose of the Study:

  • To develop a novel flexible and bifunctional electrode for stable and efficient overall water-splitting (OWS).
  • To investigate the catalytic activity of hybridized carbon nanotube ribbons and NiO quantum dots in alkaline electrolytes.

Main Methods:

  • Hybridization of macroscopically assembled carbon nanotube ribbons with atmospheric plasma-synthesized NiO quantum dots.
  • Fabrication of bifunctional electrodes with varied NiO quantum dot loadings.
  • Electrochemical testing in alkaline electrolytes using a two-electrode electrolyzer cell configuration.

Main Results:

  • The developed electrode exhibited strong bifunctional activity for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media.
  • Achieved a low cell potential of 1.81 V at 10 mA/cm² with minimal NiO quantum dot loading (83 μg/cm²).
  • Demonstrated remarkable long-standing stability, retaining ~100% of initial current after 100 hours of OWS.

Conclusions:

  • The synergistic coupling between NiO quantum dot catalysts and the carbon nanotube ribbon matrix enhances catalytic performance and stability.
  • This study presents a cost-effective and scalable pathway for developing advanced electrodes for alkaline water-splitting and green hydrogen generation.