Temperature-driven enhancement in pseudocapacitive charge storage of Sn-doped WO3 nanoflowers and its high-performance quasi-solid-state asymmetric supercapacitor
JOURNAL OF ENERGY STORAGE(2024)
摘要
The substitution of another metal cations in the WO3 matrix enhances their electrochemical performance due to the synergistic effect. In this report, Sn-doped WO3 nanoflowers are synthesized via a facile single-step hydrothermal method. Further, the temperature-dependent pseudocapacitive behavior of Sn-doped WO3 nanoflowers is investigated for quasi-solid state asymmetric supercapacitors (QSSAC). The electrochemical study reveals that the specific capacitance values of WO3 increase from 72 F g-1 to 138 F g-1 (Sn-doped WO3) at 1 A g-1. The temperature-dependent specific capacitance values of Sn-doped WO3 nanoflowers demonstrating six times enhancement with rising temperature, from 109 F g-1, 139 F g-1, 194 F g-1, 301 F g-1, to 603 F g-1 at 10 degrees C, 20 degrees C, 30 degrees C, 40 degrees C, to 50 degrees C respectively. Furthermore, the QSSAC exhibits better stability of 97.51 % up to 2500th cycles with an energy density of 8 W h kg-1 and a power density of 6400 W kg-1, attributed to enhanced conductivity, large diffusion capability, and high strength with multiple redox active sites. The experimental results emphasize the promising electrochemical features of the Sn-doped WO3 matrix, which is an effective approach for electrode materials development.
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关键词
Nanoflower,Pseudocapacitor,Quasi -solid-state asymmetric supercapacitors,Energy density,Sn-dopedWO3
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