多壁碳纳米管与镍钨酸盐纳米颗粒的复合用于下一代储能

The demand for supercapacitors with high energy and power densities has accelerated the search for efficient electrode materials. In this study, we prepared a binary composite of multi-walled carbon nanotubes (MWCNT) and nickel tungstate (NiWO 4 ) using a simple hydrothermal method, achieving a specific capacitance of 885 F g −1 at 1 A g −1 with strong cyclic stability, maintaining 86% capacity after 5000 cycles. Electrochemical analysis revealed a shift in the charge storage mechanism of MWCNT/NiWO 4 composite with “ b -values” of 0.84 to low indicating a capacitive-dominant behavior with increased scan rate likely due to the formation of a double-layer and the presence of MWCNTs. The composite exhibited enhanced conductivity with a charge transfer resistance ( R ct ) of 0.9 Ω compared to 3.2 Ω for NiWO 4 alone. This study highlights the potential of MWCNT/NiWO 4 as a cost-effective, high-performance electrode material for next-generation supercapacitors.