A binder-free wet chemical synthesis approach to decorate nanoflowers of bismuth oxide on Ni-foam for fabricating laboratory scale potential pencil-type asymmetric supercapacitor device

• Published in: Dalton transactions : an international journal of inorganic chemistry 2017-05, Vol.46 (2), p.661-6611
• Main Authors: Shinde, N. M, Xia, Qi Xun, Yun, Je Moon, Singh, Saurabh, Mane, Rajaram S, Kim, Kwang-Ho
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c7dt00953d

The present study involves the synthesis of a bismuth oxide (Bi 2 O 3 ) electrode consisting of an arranged nano-platelets for evolving a flower-type surface appearance on nickel-foam (Bi 2 O 3 -Ni-F) by a simple, inexpensive, binder-free and one-step chemical bath deposition (CBD) method, popularly known as a wet chemical method. The as-prepared Bi 2 O 3 on Ni-foam, as an electrode material, demonstrates 557 F g −1 specific capacitance (SC, at 1 mA cm −2 ), of which 85% is retained even after 2000 cycles. With specific power density of 500 kW kg −1 , the Bi 2 O 3 -Ni-F electrode documents a specific energy density of 80 Wh kg −1 . Furthermore, a portable asymmetric supercapacitor device, i.e. a pencil-type cell consisting of Bi 2 O 3 -Ni-F as an anode and graphite as a cathode in 6 M KOH aqueous electrolyte solution, confirms 11 Wh kg −1 and 720 kW kg −1 specific energy and specific power densities, respectively. An easy and a simple synthesis approach for manufacturing a portable laboratory scale pencil-type supercapacitor device is a major outcome of this study, which can also be applied for ternary and quaternary metal oxides for recording an enhanced performance. In addition, we presented a demonstration of lighting a light emitting diode (LED) using a home-made pencil-type supercapacitor device which, finally, has confirmed the scaling and technical potentiality of Bi 2 O 3 -Ni-F in energy storage devices. The synthesis and asymmetric supercapacitor application of a bismuth oxide (Bi 2 O 3 ) electrode consisting of arranged nano-platelets for evolving a flower-type surface appearance on nickel-foam (Bi 2 O 3 -Ni-F) are described.