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Type: Journal article
Title: Tungsten nitride nanodots embedded phosphorous modified carbon fabric as flexible and robust electrode for asymmetric pseudocapacitor
Author: Dubal, D.
Chodankar, N.
Qiao, S.
Citation: Small, 2019; 15(1):1-9
Publisher: Wiley
Issue Date: 2019
ISSN: 1613-6810
Statement of
Deepak P. Dubal, Nilesh R. Chodankar, and Shizhang Qiao
Abstract: Owing to the excellent physical properties of metal nitrides such as metallic conductivity and pseudocapacitance, they have recently attracted much attention as competitive materials for high-performance supercapacitors (SCs). However, the voltage window for metal nitride-based symmetric SCs is limited (0.6-0.8 V) in aqueous electrolyte due to the oxidation at high negative potentials. In this respect, ultra-small tungsten nitride particles onto the phosphorous modified carbon fabric (W₂N@P-CF) are engineered as a promising hybrid electrode for pseudocapacitors. Additionally, the fact that the W₂N@P-CF electrode can operate in the negative potential region is exploited to design asymmetric pseudocapacitors by coupling with a polypyrrole on carbon fabric (PPy@CF) as the positive electrode. Remarkably, the W₂N@P-CF//PPy@CF asymmetric cell can be cycled in a wide voltage window of 1.6 V that is almost two times higher than that of metal nitrides symmetric SCs. The pseudocapacitive behavior with matching different potential regions of W₂N@P-CF and PPy@CF, considerably enhance performance of asymmetric device. The device delivers high volumetric capacity (7.1 F cm⁻³), high energy (2.54 mWh cm⁻³ ), power densities, and good cycling stability (88%) over 20 000 cycles. Thus, pseudocapacitive metal nitride-based devices hold a great promise to provide high voltage and improved energy density in aqueous electrolyte.
Keywords: Asymmetric pseudocapacitors; flexible supercapacitors; high energy density; metal nitrides
Rights: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/smll.201804104
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