NiAlP@Cobalt substituted nickel carbonate hydroxide heterostructure engineered for enhanced supercapacitor...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Transitional metal phosphides are promising electrode materials for supercapacitors due to their conductivity and properties.
• Enhancing specific capacity and structural stability is crucial for practical supercapacitor applications.

Purpose of the Study:

• To fabricate novel heterostructured NiAlP@Co-NiCH nanosheet arrays.
• To investigate the performance of these heterostructures as battery-type electrode materials for supercapacitors.

Main Methods:

• Sequential hydrothermal reactions and phosphorization treatment were used to synthesize NiAlP@Co-NiCH nanosheet arrays.
• Fabrication of an aqueous asymmetric supercapacitor device using the synthesized material and porous carbon.

Main Results:

• The NiAlP@Co-NiCH electrode exhibited a high specific capacity of 825.7 C g⁻¹ at 1 A g⁻¹.
• The electrode demonstrated excellent rate capability (78.9% retention) and long lifespan.
• The asymmetric supercapacitor achieved an energy density of 82.3 Wh kg⁻¹ and 88.2% capacity retention after 10,000 cycles.

Conclusions:

• The heterostructured NiAlP@Co-NiCH material offers synergistic benefits for supercapacitor performance.
• This work presents a viable strategy for developing advanced transitional metal phosphide-based heterojunctions for supercapacitors.