Redox-active modification of Dawson-type copper molybdate cluster for advanced supercapacitor applications

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Cluster materials offer integrated electrochemical functionalities for energy storage.
• Dawson-type polyoxomolybdates are promising but require structural optimization for enhanced performance.

Purpose of the Study:

• To synthesize and characterize a novel symmetric supercapacitor based on a copper-incorporated Dawson-type polyoxomolybdate cluster.
• To evaluate the electrochemical performance and cycling stability of the developed supercapacitor device.

Main Methods:

• Synthesis of the polyoxomolybdate cluster [(DMA)3]3+[H9Cu2Mo18O62]3- (1) via reflux method.
• Structural elucidation using single-crystal X-ray diffraction and characterization via FT-IR, P-XRD, TGA, FE-SEM, EDX, XPS, and zeta potential analysis.
• Electrochemical evaluation in a symmetric two-electrode configuration using 1 M H2SO4 electrolyte.

Main Results:

• The cluster exhibited a highly negative zeta potential (-59.7 mV), facilitating ion transport and electrolyte accessibility.
• Maximum specific capacitance of 197.27 F g-1 (at 5 mV s-1) and 80.53 F g-1 (at 0.5 A g-1) were achieved.
• The device demonstrated excellent cycling stability, retaining 82.70% capacitance after 5000 cycles, with high energy (18.74 Wh kg-1) and power densities (332.58 W kg-1).

Conclusions:

• The novel copper-molybdate cluster demonstrates significant potential as an active material for high-performance symmetric supercapacitors.
• The material's structural integrity, stability, and favorable interfacial properties contribute to its superior electrochemical performance.
• This work highlights the utility of Dawson-type polyoxomolybdates in developing next-generation energy storage solutions.