Laser-assisted transformation of a phenol-based resin to high quality graphene-like powder for supercapacitor applications

Two Birds with One Stone: Hydrogel-Derived Hierarchical Porous Activated Carbon toward the Capacitive Performance for Symmetric Supercapacitors and Lithium-Ion Capacitors

“…(a) Galvanostatic charge–discharge profiles, (b) rate capabilities, (c) electrochemical impedance spectra, (d) Ragone plots, and (e) capacitance retention of H-HPAC in a coin-type symmetric cell. Inset of panel c illustrates the equivalent circuit model used for the parameter-fitting …”

Laser-assisted explosive synthesis and transfer of turbostratic graphene-related materials for energy conversion applications

“…T, L, O, and A stand for transverse, longitudinal, optic, and acoustic modes, respectively. Typically, the current findings demonstrate one of the very rare cases-a few examples being epitaxial graphene on SiC 8 , biomass-produced graphene 13 , and lastly polymer (phenol-based resin) derived graphene 11 -where laser-assisted decomposition of a precursor can lead to turbostratic graphene. Based on the evidence provided by three techniques, HRTEM, Raman scattering, and XRD, we conclude that the deposited films, for both cases of precursor materials, are composed of a 3D porous network of fewlayer turbostratic graphene flakes.…”

“…Laser-based methods for graphene and GRMs synthesis have much less been employed over the first decade of the graphene era, in comparison to classical wet-chemistry and hightemperature vacuum chamber methods. The sporadic attempts appearing initially have gained ground over the last years in view of the versatility offered by the use of lasers and their success in a wide variety of processes including epitaxial growth on SiC wafers 8 , and SiC particles 9 , decomposition of polymers 10,11 and biomass 12,13 , reduction of graphene oxide 14,15 , transformation of carbon materials from sp 3 to sp 2 networks 16 , and related cases 17 . These recent advances testify that laser-assisted synthesis of GRMs can confront the volume/quality trade-off without compromising on lower quality, and have thus grown awareness on their optimization.…”

Electrochemical Energy Storage in Nitrogen/Metal‐doped Carbon Aerogels Derived from Polyurea‐crosslinked Alginate Aerogels

“…The obtained spectra are shown in Figure 6 as data points, while the curves depict the corresponding fitted spectra using the equivalent electric circuit of Figure 6 inset. The chosen circuit was proposed by Kang et al., [39] and has been already used successfully in our previous study, [32] where also the physical meaning of each element is explained in detail. In short, the R 1 resistor accounts for the total ohmic resistances, R 2 represents the resistance due to current leakage processes formed in bulk electrolyte, while CPE 1 element describes the relative capacitance formation.…”