Probing the influence of morphological transformation on the electrochemical properties of hydrated tungsten oxide (WO3−x·H2O) for a high-rate aqueous asymmetric supercapacitor

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Nishad, Harishchandra S. and Gupta, Shobhnath P. and Ivaturi, Aruna and Walke, Pravin S. (2025) Probing the influence of morphological transformation on the electrochemical properties of hydrated tungsten oxide (WO3−x·H2O) for a high-rate aqueous asymmetric supercapacitor. Nanoscale, 17 (32). pp. 18571-18582. ISSN 2040-3372 (https://doi.org/10.1039/d5nr01658d)

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Abstract

The present study aims to probe morphological tuning of hydrated tungsten oxide (WO3−x·H2O) nanostructures and investigate their electrochemical performance for energy storage in supercapacitors. The WO3−x·H2O nanostructures have been prepared via a single-step wet chemical method. Furthermore, a morphological transition of WO3−x·H2O nanostructures from nanosheet-assembled nanoflowers (W1) to nanoribbons (W2) as a result of regulating the reaction time has been achieved without disturbing the orthorhombic crystal structure. The morphological transformation from W1 to W2 exhibited a decrease in crystallinity and other physical properties, significantly affecting electrochemical behavior. Electrochemical investigations revealed that W1 has a higher specific capacitance (70 F g−1) thanW2 (37 F g−1) at a current density of 1 A g−1. Moreover, an aqueous asymmetric supercapacitor (AASC) device was fabricated using WO3−x·H2O as the negative electrode. The device exhibited a specific capacitance of 40 F g−1 at 0.5 A g−1 with an energy density of 12.5 W h kg−1 and a power density of 3784 W kg−1. Additionally, it demonstrated excellent cycling stability with 97% capacitance retention over 5000 cycles. These findings highlight the potential of morphology-controlled WO3−x·H2O nanostructures for advanced energy storage applications.

ORCID iDs

Nishad, Harishchandra S., Gupta, Shobhnath P., Ivaturi, Aruna ORCID logoORCID: https://orcid.org/0000-0003-0485-6570 and Walke, Pravin S.;
CORE (COnnecting REpositories)