One pot synthesis of nickel foam supported self-assembly of NiWO4 and CoWO4 nanostructures that act as high performance electrochemical capacitor electrodes

Author(s): Guanjie He ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Jianmin Li ⁶ ^, ⁷ ^, ⁸ ^, ⁹ ^, ¹⁰ , Wenyao Li ¹¹ ^, ¹² ^, ⁹ ^, ¹⁰ , Bo Li ² ^, ¹³ ^, ¹⁴ , Nuruzzaman Noor ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Kaibing Xu ⁶ ^, ⁷ ^, ⁸ ^, ⁹ ^, ¹⁰ , Junqing Hu ⁶ ^, ⁷ ^, ⁸ ^, ⁹ ^, ¹⁰ , Ivan P. Parkin ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵

Publication date (Electronic): 2015

Journal: Journal of Materials Chemistry A

Publisher: Royal Society of Chemistry (RSC)

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Abstract

Novel NiWO ₄ and CoWO ₄ nanostructures showed excellent electrochemical properties for supercapacitor electrodes, better than those previously reported for these materials.

Abstract

In this work, we report a facile one-step hydrothermal approach to synthesize NiWO ₄ and CoWO ₄ nanostructures on nickel foam as binder-free electrodes for use as supercapacitors. The as-synthesized materials showed excellent electrochemical performance, with a high specific capacitance of 797.8 F g ⁻¹ and 764.4 F g ⁻¹ at a current density of 1 A g ⁻¹ after 3000 cycles. On increasing the current density by 20 times, the rate capabilities still maintained 55.6% and 50.6% of the original value for NiWO ₄/Ni foam and CoWO ₄/Ni foam, respectively. Moreover, both of these materials exhibited outstanding cycling stability, the 6000th cycle at 50 mV s ⁻¹ demonstrated 2.06 and 2.81 times better capacitance than the initial cycles for NiWO ₄/Ni foam and CoWO ₄/Ni foam, respectively. To our knowledge, this capacitance performance is better than any previously reported value for these materials and is a consequence of the highly evolved surface area/microstructure of the materials formed by this technique.

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Tungsten oxide single crystal nanosheets for enhanced multichannel solar light harvesting.

Tuo Wang, Junqing Yan, Landong Li … (2015)

Substoichiometric tungsten oxide single-crystal nanosheets are successfully prepared via the exfoliation of layered tungstic acid and subsequent introduction of oxygen vacancies. The combination of different strategies, i.e., 2D-structure construction, the introduction of surface oxygen vacancies, and the creation of localized surface plasmon resonance can promote the light-harvesting performance of tungsten oxide through accumulative and synergistic effects.