Ni-In(OH) nanosheets-like structure on 3D current collector for supercapacitors

초록

Here, we studied the synthesis and electrochemical behavior of Ni-In(OH)3 nanosheets as electrode materials for supercapacitors. Ni-In(OH)3 nanosheets were directly grown on nickel foam (NF) through a simple hydrothermal method, resulting in a porous nanosheet architecture with abundant electroactive sites and efficient charge transport pathways. The Ni-In(OH)3 nanosheets exhibited excellent pseudocapacitive behavior with a high specific capacitance of 968 F g(-)& sup1; and a specific capacity of 387 C g(-)& sup1; at 1 A g(-)& sup1;. With an increase in current density, the material exhibited good rate capability, retaining a capacitance of 350 F g(-)& sup1; at 10 A g(-)& sup1;. Long-term stability tests revealed that the material retained 89.7% of its initial capacitance after 4000 cycles, with a Coulombic efficiency of almost 100%, confirming excellent cycling stability and highly reversible charge-discharge behavior. The superior electrochemical performance is attributed to the porous nanosheet morphology, which facilitates rapid ion diffusion, provides a large electrochemically active surface area, and promotes efficient electron transport. These findings demonstrate that Ni-In(OH)3 is a promising electrode material for high-performance supercapacitors, offering high capacitance, good rate capability, and excellent long-term stability.

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