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Related Experiment Video

Updated: Oct 17, 2025

Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets
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Efficient Alkaline Water Oxidation with a Regenerable Nickel Pseudo-Complex.

Peikun Zhang1, Pai Wang1, Wei Wang1,2

  • 1Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China.

ACS Applied Materials & Interfaces
|October 8, 2021
PubMed
Summary

A new nickel catalyst, (bpy)NiOH, shows superior oxygen evolution reaction (OER) activity and stability in alkaline conditions. This molecular-oxide hybrid catalyst offers a promising strategy for efficient water oxidation electrocatalysis.

Keywords:
in situ UV−Vispseudo-complexregenerableturnover frequencywater oxidation

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Area of Science:

  • Electrocatalysis
  • Materials Science
  • Green Chemistry

Background:

  • Efficient electrocatalysts are crucial for the oxygen evolution reaction (OER).
  • Photosystem II-inspired catalysts show promise but face challenges in alkaline media.
  • Existing catalysts struggle with current density and stability in practical applications.

Purpose of the Study:

  • To develop a highly active and stable electrocatalyst for OER in alkaline electrolytes.
  • To investigate a nickel pseudo-complex catalyst bridging molecular and solid-state properties.
  • To demonstrate a general strategy for enhancing transition metal catalyst performance.

Main Methods:

  • Synthesis and characterization of a nickel pseudo-complex, (bpy)NiOH (bpy = 2,2'-bipyridine).
  • Electrochemical evaluation of OER activity and stability in alkaline media.
  • Comparison with existing nickel-based catalysts, including iron-incorporated variants.

Main Results:

  • (bpy)NiOH exhibited the highest OER activity among nickel catalysts, with a turnover frequency of 1.1 s⁻¹ at 0.30 V overpotential.
  • The catalyst demonstrated exceptional long-term stability, maintaining performance at 1.0 mA cm⁻² for over 200 h and 20 mA cm⁻² for over 60 h.
  • Performance surpassed iron-incorporated nickel (oxy)hydroxide under identical nickel mass loading.

Conclusions:

  • Dynamically coordinating 2,2'-bipyridine ligands in the catalyst layer sustains highly active nickel sites for water oxidation.
  • The (bpy)NiOH catalyst offers a robust and efficient solution for OER in challenging alkaline environments.
  • This work presents a generalizable strategy for improving transition metal catalyst performance using active ligands.