Abstract The three-dimensional (3D), nitrogen doped reduced graphene oxide (N-RGO) monoliths have... more Abstract The three-dimensional (3D), nitrogen doped reduced graphene oxide (N-RGO) monoliths have been synthesized using graphene oxide and melamine through an ice-templated assembly. The self-assembled monoliths are accompanied with the considerable reduction of graphene oxide after annealing and specific surface area of 190 m 2 g −1 . The blue shift of approximately 22 cm −1 and 4 cm −1 in D and G bands for N-RGO is notified in Raman analysis, confirming the incorporation of nitrogen onto the graphene sheet. In addition, an extra peak at 1251 cm −1 appears possibly due to the stretching vibration of C–N bonds. The detailed doping configurations analyzed by x-ray photoemission spectroscopy indicate the nitrogen content of around 6.2 at% in the N-RGO with predominant pyridinic N-type configuration. The specific capacitance is enhanced up to 217 F g −1 at a scan rate of 5 mV s −1 , which is approximately three times higher than that of the pristine 3D RGO owing to the pseudocapacitive behavior of N-RGO. The high electronic conductivity of the N-RGO electrode with low charge transfer resistance as confirmed by electrochemical impedance spectroscopy is associated with good rate capability. Furthermore, the N-RGO sample exhibits an excellent cyclic stability with no decay in capacitance even after 5000 cycles at scan rate of 100 mV s −1 .
ABSTRACT Few-walled carbon nanotubes (CNTs) were synthesized by the arc discharge process. The st... more ABSTRACT Few-walled carbon nanotubes (CNTs) were synthesized by the arc discharge process. The study pertains to analyze the effect of buffer gas pressure (Helium) and density of graphite anodes on morphology and yield of CNTs. The synthesis of CNTs was carried out at different buffer pressures of Helium ranging from 80 Torr to 600 Torr using different anode densities specifically 1.6 and 1.8 gm/cc. FE-SEM and TGA studies indicated that the highest percentage of MWCNTs was formed around 450 Torr pressure as compared to other pressures. It was observed that the variation of gas pressure affects the current drawn capacity and also the evaporation rate of the graphite electrode. Micro-structure of CNTs synthesized at 450 Torr consists of 8 concentric graphene layers. Improved crystallinity with better thermal stability was observed in case of high density graphite anode.
Despite the clear benefits of Na and S active materials, Na–S hybrid energy storage devices have ... more Despite the clear benefits of Na and S active materials, Na–S hybrid energy storage devices have yet to be exploited, and existing Na–S batteries cannot provide fast kinetics and long-term stabilit...
Conventional boron nitride material is a resistant refractory compound of boron and nitrogen with... more Conventional boron nitride material is a resistant refractory compound of boron and nitrogen with various crystalline forms. The hexagonal form, which corresponds to graphite, is used as a lubricant and an additive to cosmetic products because of its higher stability and softness. Recently, various nanostructured boron nitride materials, including nanosheets, nanotubes, nanoparticles, and nanocomposites with diverse new properties, have been achieved through the development of advanced synthesis techniques as well as a deeper understanding of the properties and related applications. As nanostructured boron nitride materials exhibit high chemical, thermal and mechanical stability, the incorporation of nanostructured boron nitride materials into the key components (electrolytes, separators, and electrodes) of electrochemical systems can alleviate various inherent problems. This review article systematically summarizes the integration of nanostructured boron nitride into electrolytes, ...
Despite the clear benefits of Na and S active materials, Na–S hybrid energy storage devices have ... more Despite the clear benefits of Na and S active materials, Na–S hybrid energy storage devices have yet to be exploited, and existing Na–S batteries cannot provide fast kinetics and long-term stabilit...
Abstract The three-dimensional (3D), nitrogen doped reduced graphene oxide (N-RGO) monoliths have... more Abstract The three-dimensional (3D), nitrogen doped reduced graphene oxide (N-RGO) monoliths have been synthesized using graphene oxide and melamine through an ice-templated assembly. The self-assembled monoliths are accompanied with the considerable reduction of graphene oxide after annealing and specific surface area of 190 m 2 g −1 . The blue shift of approximately 22 cm −1 and 4 cm −1 in D and G bands for N-RGO is notified in Raman analysis, confirming the incorporation of nitrogen onto the graphene sheet. In addition, an extra peak at 1251 cm −1 appears possibly due to the stretching vibration of C–N bonds. The detailed doping configurations analyzed by x-ray photoemission spectroscopy indicate the nitrogen content of around 6.2 at% in the N-RGO with predominant pyridinic N-type configuration. The specific capacitance is enhanced up to 217 F g −1 at a scan rate of 5 mV s −1 , which is approximately three times higher than that of the pristine 3D RGO owing to the pseudocapacitive behavior of N-RGO. The high electronic conductivity of the N-RGO electrode with low charge transfer resistance as confirmed by electrochemical impedance spectroscopy is associated with good rate capability. Furthermore, the N-RGO sample exhibits an excellent cyclic stability with no decay in capacitance even after 5000 cycles at scan rate of 100 mV s −1 .
ABSTRACT Few-walled carbon nanotubes (CNTs) were synthesized by the arc discharge process. The st... more ABSTRACT Few-walled carbon nanotubes (CNTs) were synthesized by the arc discharge process. The study pertains to analyze the effect of buffer gas pressure (Helium) and density of graphite anodes on morphology and yield of CNTs. The synthesis of CNTs was carried out at different buffer pressures of Helium ranging from 80 Torr to 600 Torr using different anode densities specifically 1.6 and 1.8 gm/cc. FE-SEM and TGA studies indicated that the highest percentage of MWCNTs was formed around 450 Torr pressure as compared to other pressures. It was observed that the variation of gas pressure affects the current drawn capacity and also the evaporation rate of the graphite electrode. Micro-structure of CNTs synthesized at 450 Torr consists of 8 concentric graphene layers. Improved crystallinity with better thermal stability was observed in case of high density graphite anode.
Despite the clear benefits of Na and S active materials, Na–S hybrid energy storage devices have ... more Despite the clear benefits of Na and S active materials, Na–S hybrid energy storage devices have yet to be exploited, and existing Na–S batteries cannot provide fast kinetics and long-term stabilit...
Conventional boron nitride material is a resistant refractory compound of boron and nitrogen with... more Conventional boron nitride material is a resistant refractory compound of boron and nitrogen with various crystalline forms. The hexagonal form, which corresponds to graphite, is used as a lubricant and an additive to cosmetic products because of its higher stability and softness. Recently, various nanostructured boron nitride materials, including nanosheets, nanotubes, nanoparticles, and nanocomposites with diverse new properties, have been achieved through the development of advanced synthesis techniques as well as a deeper understanding of the properties and related applications. As nanostructured boron nitride materials exhibit high chemical, thermal and mechanical stability, the incorporation of nanostructured boron nitride materials into the key components (electrolytes, separators, and electrodes) of electrochemical systems can alleviate various inherent problems. This review article systematically summarizes the integration of nanostructured boron nitride into electrolytes, ...
Despite the clear benefits of Na and S active materials, Na–S hybrid energy storage devices have ... more Despite the clear benefits of Na and S active materials, Na–S hybrid energy storage devices have yet to be exploited, and existing Na–S batteries cannot provide fast kinetics and long-term stabilit...
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