Development of 3D compound structures and highly wettable carbonate hydroxide electrodes for high-performance...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Supercapacitors are crucial for energy storage.
• Developing high-performance electrode materials is essential.
• Transition metal compounds offer promising electrochemical properties.

Purpose of the Study:

• To fabricate tailored NiCo(CO3)(OH)2 electrodes for supercapacitors.
• To investigate the impact of 3D nickel foam substrates on electrode performance.
• To evaluate an asymmetric supercapacitor configuration.

Main Methods:

• Facile hydrothermal synthesis of NiCo(CO3)(OH)2 electrodes.
• Comparative analysis of electrodes with and without 3D Ni foam substrates.
• Fabrication and testing of an asymmetric supercapacitor using NiCo(CO3)(OH)2 and graphene.

Main Results:

• NiCo(CO3)(OH)2 electrodes with Ni foam substrates showed a specific capacitance of 2576.4 F g-1.
• The asymmetric supercapacitor achieved an energy density of 35.5 Wh kg-1 and power density of 2555.6 W kg-1.
• The asymmetric supercapacitor retained ~71.3% capacity after 10,000 cycles.

Conclusions:

• 3D Ni foam substrates significantly enhance supercapacitor performance.
• The NiCo(CO3)(OH)2 electrodes and asymmetric configuration show great potential for practical energy storage.
• Hydrophilic carbonate-based transition metal electrodes benefit aqueous electrolytes.