Emerging Vanadium-Doped Cobalt Chloride Carbonate Hydroxide for Flexible Electrochromic Micro-Supercapacitor:...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Multifunctional devices combining electrochromic and supercapacitance properties are crucial for modern electronics.
• Vanadium-doped cobalt chloride carbonate hydroxide hydrate nanostructures (V-C³H NSs) offer potential for such applications.

Purpose of the Study:

• To synthesize and characterize V-C³H NSs for their electrochromic and supercapacitor capabilities.
• To evaluate the performance of V-C³H NSs in flexible/wearable electrochromic micro-supercapacitor devices (FEMSDs).

Main Methods:

• Synthesis of V-C³H NSs.
• In situ spectroelectrochemical measurements for electrochromic analysis.
• Fabrication of FEMSDs using mask-assisted vacuum filtration.
• Artificial neural network (ANN) modeling for performance prediction.

Main Results:

• V-C³H NSs demonstrated a high specific capacitance (1219.9 F g^-1) with excellent capacitance retention (100% over 30,000 cycles).
• Superior electrochromic properties were observed, including fast switching times (15.7-18.8 s), high coloration efficiency (65.85 cm² C^-1), and optical modulation (69%).
• Fabricated FEMSDs achieved an areal capacitance of 47.15 mF cm^-2 and high energy/power densities (104.78 Wh kg^-1 and 0.04 mW cm^-2).

Conclusions:

• The synthesized V-C³H NSs exhibit promising multifunctional properties for energy storage and electrochromic applications.
• The developed FEMSDs are suitable for flexible/wearable electronic devices.
• The integration of ANN modeling aids in predicting device performance.