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Updated: Jul 7, 2026
12:00
Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
A pH-Tolerant Nickel-Vanadium Phosphonate Framework for Stable Aqueous Supercapacitor Cycling
Tim Müller1, Jean G A Ruthes2,3, Lukas Wagner4,5
1Department of Inorganic Chemistry, Heinrich Heine University Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf, Germany.
ACS Nano
|July 6, 2026
Summary
We developed a novel hybrid metal-phosphonate framework for energy storage. This material shows excellent capacitance and stability across a wide pH range, making it promising for future aqueous batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Development of advanced materials for energy storage is crucial for sustainable energy solutions.
- Metal-organic frameworks and phosphonate-based materials offer tunable properties for electrochemical applications.
Purpose of the Study:
- To synthesize and characterize a novel hybrid layered metal-phosphonate framework.
- To investigate the electrochemical properties, redox activity, and stability of the material for energy storage applications.
Main Methods:
- Synthesis of a hybrid layered metal-phosphonate framework: [Ni(2,2'-bpy)3]2+[(VO(H2O))2(VO)4(μ-O)2(C6H5PO3)6]2-·2H2O.
- X-ray photoelectron spectroscopy (XPS) for surface elemental and oxidation state analysis.
- Electrochemical characterization including cyclic voltammetry and galvanostatic charge-discharge in aqueous electrolytes.
- Photoluminescence and magnetic susceptibility measurements.
Main Results:
- The material exhibits a dynamic redox system with coexisting Ni2+, V2+, V3+, and V4+/V5+ species.
- High specific capacitances of 79 F/g (Na2SO4, pH 7) and 43 F/g (H3PO4, pH 4) at 1 A/g were achieved.
- Exceptional capacitance retention of over 10,000 cycles at 1 mV/s in Na2SO4 (pH 7) and stability between pH 2-10.
Conclusions:
- The hybrid metal-phosphonate crystals demonstrate robust electrochemical performance and stability.
- The material's properties make it a strong candidate for next-generation aqueous energy-storage devices.
- Sustainable synthesis combined with excellent performance highlights its potential for practical applications.
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