Review of recent technologies for transforming carbon dioxide to carbon materials

Recent advances in carbon nanostructures prepared from carbon dioxide for high-performance supercapacitors

Metal oxide based supercapacitors can provide much higher energy densities as compared with carbon-based ones. However, metal oxides usually suffer from low power densities together with poor cycle life, which is a big barrier for their practical applications. In this work, purposely confined NiO nanoparticles have been deposited uniformly on a three-dimensional graphite foam–carbon nanotube forest substrate, giving rise to a well-integrated free-standing electrode (GF–CNT@NiO) with strong synergetic effects generated from nickel oxide and the carbon support. The electrode with 57.6% mass content of NiO delivers a high specific capacity of 196.5 mA h g−1 and excellent cycling stability for 30000 cycles. By coupling with a graphene–CNT paper anode, an asymmetric supercapacitor (GF–CNT@NiO//G–CNT) is assembled, which demonstrates excellent cycling ability (only 18.3% of capacitance drop after 30000 cycles) and high power density (1.06–7.14 kW kg−1), suggesting its great promise for advanced supercapacitors.

Conformally deposited NiO on a hierarchical carbon support for high-power and durable asymmetric supercapacitors

Perovskite LaNiO3-δ oxide as an anion-intercalated pseudocapacitor electrode

Rational assembly of carbon nanostructures into large-area films is a key step to realize their applications in ubiquitous electronics and energy devices. Here, a self-assembly methodology is devised to organize diverse carbon nanostructures (nanotubes, dots, microspheres, etc.) into homogeneous films with potentially infinite lateral dimensions. On the basis of studies of the redox reactions in the systems and the structures of films, the spontaneous deposition of carbon nanostructures onto the surface of the copper substrate is found to be driven by the electrical double layer between copper and solution. As a notable example, the as-assembled multiwalled carbon nanotube (MWCNT) films display exceptional properties. They are a promising material for flexible electronics with superior electrical and mechanical compliance characteristics. Finally, two kinds of all-solid-state supercapacitors based on the self-assembled MWCNT films are fabricated. The supercapacitor using carbon cloth as the current collector delivers an energy density of 3.5 Wh kg−1 and a power density of 28.1 kW kg−1, which are comparable with the state-of-the-art supercapacitors fabricated by the costly single-walled carbon nanotubes and arrays. The supercapacitor free of foreign current collector is ultrathin and shows impressive volumetric energy density (0.58 mWh cm−3) and power density (0.39 W cm−3) too.

General Method for Large-Area Films of Carbon Nanomaterials and Application of a Self-Assembled Carbon Nanotube Film as a High-Performance Electrode Material for an All-Solid-State Supercapacitor

Facile synthesis of nanographene sheet hybrid α-MnO2 nanotube and nanoparticle as high performance electrode materials for supercapacitor

The invention discloses a method for preparing a three-dimensional carbon nano tube net, which comprises the steps that active metal: sodium, potassium, magnesium, calcium or carbon dioxide serves as a raw material; a metal net serves as a template; the active metal and the metal net are put into a high-temperature furnace; heating is performed under argon or nitrogen shield; carbon dioxide or mixed gas of carbon dioxide and nitrogen or argon is supplied; and the three-dimensional carbon nano tube net is directly prepared on the metal net by utilizing oxidation reduction reaction between the active metal and carbon dioxide. The size of a carbon nano tube can be controlled by adjusting reaction temperature, reaction time and supplied gas flow. The raw material is cheap, and easy to obtain; the method is low in cost and simple in synthesis technology; greenhouse gas carbon dioxide serves as the raw material, so that the method is environment-friendly; and the obtained carbon nano tube net has better conductivity and mechanical property, and can be widely applied to preparation of electrode materials of supercapacitors or lithium ion batteries.

Method for preparing three-dimensional carbon nano tube net

The invention discloses a preparation method of a mesoporous carbon hybrid manganese peroxide nano material. The method comprises the following steps: combusting a certain amount of simple substance magnesium in an acidic potassium permanganate solution into which sufficient carbon dioxide is introduced; and reacting the obtained mixed solution in the high-pressure reaction kettle at 40-200 DEG C for 1-48 hours, naturally cooling, carrying out centrifuge washing, and drying to obtain the mesoporous carbon hybrid manganese peroxide nano material. The invention also discloses a mesoporous carbon hybrid manganese peroxide nano material prepared by the preparation method. Two shapes, including mesoporous carbon hybrid manganese peroxide nanotubes and mesoporous carbon hybrid manganese peroxide pseudocubic nano boxes, can be obtained under different reaction conditions.

Mesoporous carbon hybrid manganese peroxide nano material and preparation method thereof

Fabrication of three dimensional carbon nanotube foam by direct conversion carbon dioxide and its application in supercapacitor

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Facile synthesis of nanographene sheet hybrid α-MnO2 nanotube and nanoparticle as high performance electrode materials for supercapacitor

Method for preparing three-dimensional carbon nano tube net

Mesoporous carbon hybrid manganese peroxide nano material and preparation method thereof

Fabrication of three dimensional carbon nanotube foam by direct conversion carbon dioxide and its application in supercapacitor