Mesoporous carbon hollow sphere with dandelion‐like radial‐hierarchy for high‐performance supercapacitors

Abstract

Ordered mesoporous carbons (OMCs) possess great advantages, such as large surface area, uniform pore distribution, high porosity, and physical and chemical stability. However, the monotonic and long porous channels in OMCs hinder their further application, especially in energy storage. Here, we synthesized mesoporous carbon hollow spheres (MCHSs) with a "Dualtemplating method" using dandelion-like silica spheres (DSSs) as the template.Through the dual-templating method, the MCHSs directly replicated the mesoporous edge of DSSs as a thick mesoporous shell but substituted the clogged central core with hollow-core. The combined structure with mesoporous carbon spheres and hollow-core has various advantages over conventional OMCs.The radial and hierarchical pores in the sphere provide a large surface area (1319 m 2 g À1 ), short diffusion path, and open-pore that facilitates ion transfer to any direction. Simultaneously, the hollow sphere carved in the center of the MCHSs allows space for the improvement of ion mobility and electrolyte retention. Also, the dense structure of the MCHSs allows more compact packing and high tap density when MCHSs were applied as an electrode. The MCHSs exhibit high specific capacitance and present a well-developed EDLC shape at all scan rates (10 to 1000 mV s À1 ), the results show a superior electrochemical performance compared with other recent mesoporous carbon allotropes.

Preparation and properties of mesoporous SiO2/polyimide composite films

“…23 In addition, it has excellent dielectric constant and loss characteristics, which can improve the performance and stability of the device. 24 Also, it can be used as a substrate or coating material for optical devices with good transparency and low dielectric constant, 25,26 which helps to improve the optical performance and stability of the devices, thus attracting much attention of scholars. 27 There are various methods for the preparation of hollow mesoporous SiO 2 , [28][29][30][31] and the hard template method and soft template method are the commonly used preparation methods.…”

“…Hollow mesoporous SiO 2 materials have various advantages such as simple preparation, large specific surface area, 16–18 large pore volume, 13,19 ordered mesoporous structure, good biocompatibility, 20,21 stability, 22 and easy surface modification 23 . In addition, it has excellent dielectric constant and loss characteristics, which can improve the performance and stability of the device 24 . Also, it can be used as a substrate or coating material for optical devices with good transparency and low dielectric constant, 25,26 which helps to improve the optical performance and stability of the devices, thus attracting much attention of scholars 27 …”

Ultrasensitive catechin electrochemical sensor based on uniform ordered mesoporous carbon hollow spheres (MCHSs) advanced carbon-based conductive materials

“…[14][15][16][17] With the continuous development of hollow porous materials, silica, metal oxides and carbon have been involved. [18][19][20][21] Mesoporous carbon hollow spheres (MCHSs) have attracted great attention from researchers because of their advantages, such as large pore and low density with richer active sites, porous shells and high surface area, and they are widely used for super capacitors, 22,23 drug carriers, 24 lithium-ion batteries 25 and energy storage. 26 However, MCHSs have rarely been used in electrochemical sensors for the detection of phenolic compounds, and the control of the mesoporous structure of carbon spheres remains a challenge.…”

Agarose Gel-Templating Synthesis of a 3D Wrinkled Graphene Architecture for Enhanced Supercapacitor Performance

“…The power output of most renewable energy sources, such as sunlight and wind, exhibits natural fluctuations, necessitating the use of energy storage devices to achieve a balance between energy supply and demand [ 1 ]. Among the various types of energy storage devices (e.g., rechargeable battery [ 2 ], supercapacitor [ 3 ]), supercapacitors are especially significant because they offer rapid charge–discharge ability with low energy losses, as well as a long cycling life and excellent power density [ 4 ]. However, their relatively low energy density is a critical limitation that has hindered the broad application of supercapacitor systems [ 5 ].…”