Nitrogen and oxygen co-doped graphene quantum dots with high capacitance performance for micro-supercapacitors

One-step preparation of N,O co-doped 3D hierarchically porous carbon derived from soybean dregs for high-performance supercapacitors

“…In addition, N-Q can improve high conductivity and facilitate electron transfer of carbon materials. 57 The higher surface N/O ratio (Table S1 †) of N-O-HPC-3 compared with other samples is more favorable for electrochemical performance, because of higher electrochemical stability of the nitrogen groups than oxygen groups. 58,59 In a three-electrode system, electrochemical performances of all electrodes were rstly tested in a 1 M H 2 SO 4 electrolyte, as shown in Fig.…”

Graphene Quantum Dots as Flourishing Nanomaterials for Bio-Imaging, Therapy Development, and Micro-Supercapacitors

“…Generally, carbon-based micro-supercapacitors working on the principle of EDLC are limited by the energy loading densities and quite low specific capacitances and energy, since the corresponding electrode materials are derived from weakly active and huge carbon components [ 240 ]. To overcome this drawback, strongly active N and O co-doped GQDs can be used to obtain abundant active sites, increased hydrophilicity and extremely smaller sizes [ 240 ].…”

“…Generally, carbon-based micro-supercapacitors working on the principle of EDLC are limited by the energy loading densities and quite low specific capacitances and energy, since the corresponding electrode materials are derived from weakly active and huge carbon components [ 240 ]. To overcome this drawback, strongly active N and O co-doped GQDs can be used to obtain abundant active sites, increased hydrophilicity and extremely smaller sizes [ 240 ]. In a study reported in 2018, N-O-GQDs MSCs could offer higher volumetric capacitance of 325 F cm 3 in sulfuric acid owing to their elevated electrolyte wettability, high storage density, and excellent pseudo-capacitance property [ 240 ].…”

“…To overcome this drawback, strongly active N and O co-doped GQDs can be used to obtain abundant active sites, increased hydrophilicity and extremely smaller sizes [ 240 ]. In a study reported in 2018, N-O-GQDs MSCs could offer higher volumetric capacitance of 325 F cm 3 in sulfuric acid owing to their elevated electrolyte wettability, high storage density, and excellent pseudo-capacitance property [ 240 ].…”

Recent developments of advanced micro-supercapacitors: design, fabrication and applications

“…Moreover, the adoption of highly flexible substrates makes planar MSCs capable of gaining excellent mechanical properties. Thus, it is found that MSCs are more skilled and have higher practicability than micro-batteries in these particular areas [13][14][15][16] . Currently, MSCs have two types of structures: conventional sandwich structures and in-plane interdigital structures (Fig.…”