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Engineering nanohaired 3D cobalt hydroxide wheels in electrospun carbon nanofibers for high-performance supercapacitors

Mukhiya, Tanka,Dahal, Bipeen,Ojha, Gunendra Prasad,Kang, Dawon,Kim, Taewoo,Chae, Su-Hyeong,Muthurasu, Alagan,Kim, Hak Yong Elsevier 2019 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.361 No.-
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Abstract Engineering nanostructures in the desired design and suitable size is one of the key issues for persuading high-performance supercapacitors (SCs). In this work, we report a successful synthesis of a new type of nanohaired three-dimensional cobalt hydroxide wheels/carbon nanofibers (3D Co(OH)2/CNFs) composite by a cost-effective electrospinning cum hydrothermal method. The 3D Co(OH)2 wheels are composed of many partially-fused, nanohaired and serrated sheet-like nanoleaflets furnishing abundant active sites. This novel architecture is quite significant for the stability of the composite since the wheels encircle one or more conductive CNFs firmly rather than the simple attachment on the surface of substrate. The growth process of 3D Co(OH)2 wheels on CNFs has been studied by synthesizing other two novel Co(OH)2/CNFs composites. The as-prepared material exhibits a specific capacitance of 1186 F g−1 at a current density of 1 A g−1 with excellent cyclic stability which is the highest reported value for Co(OH)2/CNFs composites. The asymmetric supercapacitor (ASC) device assembled using 3D Co(OH)2/CNFs as a positive electrode and nitrogen doped graphene hydrogel (NGH) as a negative electrode exhibits a high energy density of 60.31 W h kg−1 at power density of 740.8 W kg−1 which still remains 37 W h kg−1 even at a higher power density of 7500 W kg−1 with remarkable cycle life. Therefore, the composite stands as a promising candidate for SCs electrode material. This unique nanoengineering gives an insight into the synthesis of other stable nanocomposites for diverse applications like sensors, catalysis, etc. Highlights <UL> <LI> A novel nanohaired 3D cobalt hydroxide wheels have been uniformly inserted in CNFs. </LI> <LI> Growth process of 3D cobalt hydroxide wheels in CNFs has been proposed. </LI> <LI> 3D Co(OH)2/CNFs//NGH ASC exhibits high energy density with remarkable cycle life. </LI> </UL> Graphical abstract [DISPLAY OMISSION]
2
In-built fabrication of MOF assimilated B/N co-doped 3D porous carbon nanofiber network as a binder-free electrode for supercapacitors

Dahal, Bipeen,Mukhiya, Tanka,Ojha, Gunendra Prasad,Muthurasu, Alagan,Chae, Su-Hyeong,Kim, Taewoo,Kang, Dawon,Kim, Hak Yong Pergamon Press 2019 Electrochimica Acta Vol. No.
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Abstract Polyacrylonitrile (PAN) based carbon nanofibers (CNFs) show enormous potential as a high performance and cost-effective supercapacitor electrode material. However, there are two intrinsic limitations that prevent their deployment in this field, namely their low surface area and limited transporting channels for ion diffusion. Here, we design an approach that concurrently addresses both problems. We employ electrospinning of PAN and zeolitic imidazolate framework (ZIF-8) nanoparticles to fabricate highly porous CNFs, followed by a sodium borohydride treatment and freeze-drying to maintain the three-dimensionalities of carbon nanofibers networks. Nitrogen and boron co-doping could be achieved together by controlling the conditions for stabilization and carbonization after the ammonium borate tri-hydrate treatment. The novel ZIF-8 incorporated 3D nitrogen and boron co-doped carbon nanofiber electrode was tested as a binder-free supercapacitor electrode and delivered a high specific capacitance of 295 F g−1 at a 0.5 A g−1 current density, exceeding that of PAN-based carbon nanofiber supercapacitor electrodes. Indeed, the novel electrode also maintained a high rate capability and remarkable cyclic stability of 94.5% capacitance retention even after 10 000 charge-discharge cycles. This superior electrochemical performance is attributed to the large surface area, mesoporous nature and high wettability of the B and N doped carbon nanofiber electrode. This study will inspire the development of new 3D PAN and metal organic framework based porous electrode materials for high performance energy storage devices. Graphical abstract [DISPLAY OMISSION]

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