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Updated: Jul 1, 2025
Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area
Published on: February 19, 2018
An Immobilized (Carbene)Nickel Catalyst for Water Oxidation
Zhiyao Lu1, Debanjan Mitra1, Sri R Narayan1
1Donald P. and Katherine B. Loker Hydrocarbon Institute, Wrigley Institute for Environment and Sustainability, and Department of Chemistry, University of Southern California, Los Angeles, California, 90089-1661, United States.
Researchers developed robust nickel-carbene catalysts for efficient water splitting. These catalysts form stable films on electrodes, advancing electrochemical energy storage and inspiring new catalyst designs.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Water splitting's oxygen evolution reaction (OER) is crucial for energy storage.
- Homogeneous nickel catalysts for OER remain underexplored compared to heterogeneous nickel electrodes.
- Developing efficient and stable OER catalysts is a key challenge.
Purpose of the Study:
- To report novel carbene-ligated nickel(II) complexes as homogeneous OER catalysts.
- To investigate the formation of supported heterogeneous catalysts from these complexes.
- To evaluate the catalytic performance and stability of these new systems.
Main Methods:
- Synthesis of two carbene-ligated nickel(II) complexes.
- Assembly of a thin film of these complexes onto a metal electrode via poly-imidazole bridges.
- Electrochemical characterization of the oxygen evolution reaction (OER).
Main Results:
- The nickel complexes demonstrated exceptional robustness and efficiency as homogeneous OER catalysts.
- A stable, electrode-supported heterogeneous catalyst was formed, resilient to leaching.
- The catalysts exhibited excellent current densities, high efficiency, low Tafel slope, and good longevity.
- Imidazole carbene ligands remained bonded to nickel(II) centers during catalysis.
Conclusions:
- Carbene-ligated nickel(II) complexes are effective homogeneous and supported heterogeneous OER catalysts.
- Electrode-supported metal-complex catalysts offer a promising, rare alternative to molecular and nanoparticle catalysts.
- This work provides a new design strategy for robust and efficient electrochemical water oxidation.
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