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Updated: May 21, 2026

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

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Co Single Atom Coupled with 3D-Printed Electrodes for High-Efficiency Solar-Driven Oxygen Evolution.

Xinxin Liu^1,2, Sichao Wang^1,2, Jiyuan Yu³

¹School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.

|May 19, 2026

Summary

Highly efficient electrocatalysts are crucial for water electrolysis. This study presents a novel cobalt-based single-atom catalyst (Co2(CN)5NH2) integrated into a 3D nickel electrode, demonstrating exceptional oxygen evolution reaction activity and stability for large-scale applications.

Keywords:

3D-printed electrodes Co2(CN)5NH2 electrocatalysts oxygen evolution reaction single-atom

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Efficient electrocatalysts are vital for water electrolysis to produce hydrogen and oxygen.
Current limitations in electrocatalyst efficiency hinder large-scale water splitting.

Purpose of the Study:

To develop a highly efficient and stable electrocatalyst for the oxygen evolution reaction (OER).
To engineer a self-supported electrode with enhanced catalytic activity and durability for water electrolysis.

Main Methods:

Synthesized a single-atom dispersed bimetallic cyanide-bridged structure (Co2(CN)5NH2) using 2-methylimidazole as a coordination anchor.
Fabricated a self-supported Co2(CN)5NH2/Ni-3D electrode.
Evaluated the electrode's OER performance in 1.0 M KOH.

Main Results:

The Co2(CN)5NH2 catalyst achieved an overpotential of 218.5 mV at 10 mA cm-2.
The Co2(CN)5NH2/Ni-3D electrode exhibited stable operation for over 110, 100, and 140 hours at 20, 50, and 100 mA cm-2, respectively.
The electrode's interconnected pore structure facilitated rapid bubble release, enhancing long-term performance.

Conclusions:

The Co2(CN)5NH2/Ni-3D electrode offers a versatile platform for large-scale water electrolysis and oxygen production.
Synergistic optimization of macrostructure and microscale catalytic activity ensures excellent adaptability for long-term OER applications.