A carbon quantum dot decorated RuO2 network: outstanding supercapacitances under ultrafast charge and discharge

Electrochemical kinetics of nanostructure LiFePO 4 /graphitic carbon electrodes

“…This means that the peak B (amorphous LFP) characteristic is associated with a fast, nondiffusionlimited, surface reaction such as observed for pseudocapacitive materials. Differently from MnO 2 [4,5], TiO 2 [6] or Nb 2 O 5 [16], this pseudocapacitive behavior is extrinsic in origin, since it is related to the presence of Fe 3+ defects in the structure [15,21,22]. To get further insights on the electrochemical reaction kinetics in the two different potential ranges (peaks A and B), we divided the total current into two contributions such as proposed by Dunn's group [15,16,26,27].…”

“…A promising route to increase the energy density of supercapacitors is designing hybrid supercapacitors where an activated carbon electrode is combined with a fast, faradic charge storage electrode [3]. Pseudocapacitive materials with fast redox reactions confined at the surface of materials have been proposed as the faradic electrode, such as transition metal oxides [4][5][6][7] or two-dimensional transition metal carbides [8,9]. However, most of these pseudocapacitive materials operate in aqueous electrolytes, thus limiting their practical interest for high-energy supercapacitor applications.…”

Template-grown graphene/porous Fe2O3 nanocomposite: A high-performance anode material for pseudocapacitors

“…The second strategy extends the first one by introducing a porous morphology, which render large interfacial contact with the electrolyte and thus allow fast ionic transfers [25][26][27]. The third approach is to build heterostrucured composite materials by integrating pseudocapacitive materials with conductive skeletons (e.g., nano-carbon, graphene) [28][29][30][31][32][33]. This approach could in principle provide efficient pathways to transport electrons, thus reducing electrochemical polarization and enhancing pseudocapacitive kinetics.…”

High Energy Density Asymmetric Supercapacitors From Mesoporous NiCo2S4 Nanosheets

“…Despite significant advance has been made in SCs, the practical applications of SCs are still hindered by the relatively poor electrochemical performances of the electrode materials, such as poor cycling stability of conductive polymers, low specific capacitance of carbon-based materials, and high cost of typical transition metal oxides of RuO2 [3]. Note that RuO2 has the benefits of high specific capacitance and excellent cycling stability, except for the high cost and rare resource [4,5]. Additionally, since the pioneer work reported by Hu et al [6], spinel NiCo2O4 has sparked worldwide attention with many unique advantages, which has been a promising candidate to substitute noble metal oxide of RuO2 for supercapacitor applications.…”