Miss Rajshree Samantray is currently a research scholar in Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, Odisha, India. She has 4 years of research experience in material science domain. Her research focuses are advanced materials for sustainable energy systems and EDLC Supercapacitors.
Activated Carbon (AC) is one of the major promising and economical adsorbent due to large surface area and huge pore volume with micro pores, meso-pores or hierarchical pores. In recent years, it has been focused that biomass has great potential applications in energy storage devices, especially in super-capacitors. This work is focused on stem of saccharum spontaneum (Wild Sugarcane), i.e. abruptly available in the wastelands. Activation was done with ZnCl2 treated in an aqueous NaClO solution with impregnation ratio of 2 to 3. The electrochemical studies in an aqueous electrolyte showed high specific capacitance of 420 and 318 F/g, achieved in three electrode and symmetric two electrode system respectively. The structural and surface properties of the pore formed were studied with SEM and HR-TEM. Moreover, it was detected that the activation temperature has significant role in the electrochemical performance, as the activated sample at 700 ºC showed best results than activated at 500 ºC. The performance of fabricated supercapacitor devices using Saccharum Spontaneum derived AC in aqueous electrolyte medium is signifcantly high and suitable for applications on energy storage.
Dr Jin-Yong Hong is currently a senior research scientist at the carbon industry frontier research center of Korea Research Institute of Chemical Technology (KRICT). He has completed his PhD from Seoul National University, Korea and postdoctoral studies from Massachusetts Institute of Technology, USA. He has published more than 53 papers in reputed journals. His scientific interests focus on the synthesis and functionalization of carbonaceous nanomaterials for energy/environmental applications.
Degradation in intrinsic properties of chemical vapor deposition (CVD)-grown graphene, as a result of the imperfect transfer process, is a crucial issue that must be solved for successful applications of graphene. Up to date, various transfer approaches have been developed to apply the practical applications to maintain the graphene properties. Despite the high technological demand and the amount of efforts that have been devoted, at this stage there are still critical challenges that have not been solved. In this work, we develop a very simple, yet effective, approach, based on distinctive features (i.e. physical, mechanical, and chemical properties) of ethylene vinyl acetate (EVA) as a support/carrier material, for transferring CVD-grown graphene from a growth substrate onto substrates with rough features. This novel and facile method can not only result in satisfactory transfer on substrates with terraces or grooves, but also gives rise to a successful result for uneven growth substrates (textured and also crumpled). The outstanding mechanical properties of EVA as a support/carrier material provide a conformal graphene transfer onto such irregular substrates and avoiding tears in the graphene. Moreover, the well-matched solubility parameters between the polymer and the solvent give rise to a highly cleaned graphene surface with minimal polymer residue. Consequently, the graphene transferred with EVA support/carrier material exhibits superior electrical performance compared with most presently used transfer methods.
Jea Uk Lee has completed his PhD from Seoul National University, South Korea. He has published more than 40 papers in reputed journals and has been serving as an editorial board member of repute.
Thermally conductive but electrically insulating polymer composites are highly desired for thermal management of the microelectronic applications, because of their ease of processing, light weight, and low cost. Graphene has great potential in thermal management applications due to its inherent thermal conductivity and high aspect ratio. However, graphene-based composites show a high electrical conductivity even with a low loading of fillers, which greatly limits their thermal management applications in electronic devices. Therefore, it is critically required to minimize the electrical conductivity of graphene-based composites. In this work, polydopamine (PDA)-coated electrochemically exfoliated graphene (EEG)@Al hybrids, denoted as Al@EEG@PDA, was prepared by a one-step ball milling route. The resulting Al@EEG@PDA was composited with epoxy resin, resuliting in thermally conductive but electrically insulating polymer composites.
Doo-Hwan Jung has completed his PhD from Chungnam national university, Korea and postdoctoral studies from Kyushu University, Japan. He is the president of the Korean Carbon Conference. And he is the director of KIER, a fuel cell laboratory and the professor of UST. He has published many papers in reputed journals
Recently, the development of the industrial society and the high growth have caused various harmful substances and the problem of environmental pollution has been intensified, and development of hazardous substances treatment agents has been demanded. Wastewater contains various harmful substances and causes serious problems. Activated carbon is used as various adsorbents because it has a large specific surface area, is cheap, and has excellent adsorption performance. Activated carbon is widely used in industrial fields such as purification of gases and water, catalysts, catalytic reactions and separation processes. In this study, the possibility of activated carbon for the adsorption of phenol from aqueous solution was studied. N2 adsorption / desorption, specific surface area and pore size were investigated to evaluate the effects of contact time, initial concentration and adsorption / desorption characteristics of activated carbon. Adsorption of waste water from aqueous solution was investigated using activated carbon and compared with commercial activated carbon.