Engineering Coordination-Modulated Binary Nickel Cobalt MOF Nanoarchitectures for Enhanced Supercapacitor Performance

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Supercapacitors require advanced electrode materials for improved energy storage.
• Metal-organic frameworks (MOFs) offer tunable properties for electrochemical applications.
• Nickel-cobalt (NiCo) bimetallic MOFs are promising due to their synergistic effects.

Purpose of the Study:

• To investigate the impact of coordination modulation (CM) on NiCo MOF synthesis and electrochemical performance.
• To understand the role of pH in controlling NiCo MOF structure, properties, and supercapacitor efficiency.
• To optimize NiCo MOFs for high-performance supercapacitor applications.

Main Methods:

• Synthesis of NiCo MOFs using a coordination modulation strategy at varying pH levels.
• Characterization of structural, textural, and surface charge properties of synthesized MOFs.
• Electrochemical testing of NiCo MOFs as supercapacitor electrodes and in asymmetric devices.

Main Results:

• Coordination modulation at different pH levels yielded NiCo MOFs with distinct morphologies and properties.
• NiCo MOFs synthesized at pH 6.0 exhibited a specific capacitance of 576.4 F/g at 1 A/g.
• An asymmetric supercapacitor device using pH 6.0 NiCo MOF demonstrated excellent energy density (20.4 Wh/kg) and stability (87.50% retention over 2500 cycles).

Conclusions:

• Coordination modulation is a key strategy for tailoring NiCo MOF properties for supercapacitors.
• pH plays a critical role in the pH-induced surface charge effect, influencing material performance.
• NiCo MOF synthesized at pH 6.0 is a highly promising candidate for advanced energy storage applications.