Integrated Carbon Dots-Matrix Structures: An Efficient Strategy for High-Performance Electric Double Layer Capacitors

Abstract

As a type of nanomaterials that has received much attention, carbon dots (CDs) have played distinctive roles in various energy storage materials, benefiting from their advantages of controllable surface structures, good solubility, stable chemical properties, and low cost. However, noncontinuous structures of CDs will hinder their further application due to their unsatisfactory charge transfer performance. Here, we develop a series of carbon materials with CDs-carbon matrix structure based on mixed biogels and through a facile calcination−activation method. The potential applications of theses carbon materials have been demonstrated by electric double layer capacitors (EDLCs), where the optimal sample shows 500 F g −1 (1 A g −1 ) and the maximum rate of increment will be over 73% compared with that of an Agglomerated-CDs sample.

Hierarchical Lignin-Based Carbon Matrix and Carbon Dot Composite Electrodes for High-Performance Supercapacitors

“…With the CDs fused into the carbon skeleton, the surface roughness was increased, thus achieving a high surface area, which led to the higher capacity. 32,33 CDs were also applied as the electrodes for batteries and achieved better cycle ability and higher capacity due to the special carbon frame structure with a larger interlayer space and a large surface area. 34 In this work, we applied N-doped CDs and mixed with lignin-based ACs under an optimized ratio, making the CDs fully and uniformly distributed on the surface of the highly porous AC matrix to form a three-dimensional (3D) carbon composite with an interior surface decorated with CDs.…”

“…Researchers have tried to integrate CDs into the porous carbon frameworks by the one-step calcination-activation method and employed them as the EDLC materials. With the CDs fused into the carbon skeleton, the surface roughness was increased, thus achieving a high surface area, which led to the higher capacity. , CDs were also applied as the electrodes for batteries and achieved better cycle ability and higher capacity due to the special carbon frame structure with a larger interlayer space and a large surface area …”

Effective Adsorption and Sensitive Detection of Cr(VI) by Chitosan/Cellulose Nanocrystals Grafted with Carbon Dots Composite Hydrogel

“…Many studies have shown that CDs can be used to detect Cr(VI) optically [11,12]. However, some issues remain in sensor probe application, such as CD agglomeration with increasing detection and storage time [13]. One possible solution to overcome this problem is to graft with other materials, such as CN [14].…”

Electrodeposition Coupled with Electrochemical Activation for Constructing High-Capacitance Carbon Quantum Dot-Based Films on Carbon Cloth as Electrodes

“…As a new class of carbon nanomaterial, carbon quantum dots (CQDs) have received widespread attention in SCs owing to their tunable redox activity, rich surface functional groups, high water dispersion, low production cost, and extensive raw materials . Until now, CQDs have been mainly used as an additive or a structure-directing agent for constructing advanced CQD-based nanocomposites, such as CQDs/metal oxides, − CQDs/metal sulfides, − CQDs/polymers, , CQDs/metal hydroxide, , and CQDs/activated carbon. , As electrode materials for SCs, these nanocomposites showed excellent capacitance performance. It has been found that CQDs can minimize charge transfer or internal resistance, accelerate ion transportation, and reduce the volume expansion effect of metal oxides as well as provide additional active sites and improve surface hydrophilicity for conductive polymers and activated carbon, which will be conducive to the improvement oin capacitive performance.…”