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( Sadhasivam Thangarasu ),정호영 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
The organic-inorganic hybrid composite membrane of sulfonated poly (phenylene oxide) (sPPO)-nano sized sulfonated silica (sSiO2) was prepared to improve the ionic conductivity (IC) and decrease vanadium permeability for vanadium redox flow battery (VRFB). Comparatively, the sPPO with 2% sSiO2 showed higher WU, IC and IEC than sPPO alone. The IC of hybrid membranes are 0.050, 0.073, 0.077 and 0.073 S/cm for sPPO, sPPO-1, 2 and 4% sSiO2 membranes, respectively. The hybrid membranes has exhibited higher IC because of hydrophilic properties of SiO2-SO3H in sPPO polymer matrix. The VO2+ perme-ability of Nafion®212, sPPO and sPPO- 2% sSiO2 hybrid membranes are 2.22 × 10-7, 2.50 × 10-8 and 4.76 × 10-9 cm2 min-1, respec-tively. The inorganic nanofillers of sSiO2 in sPPO membrane appeared to act as a barrier to VO2+ ions crossover. Low cost, high IC and lower vanadium permeability of sPPO-sSiO2 hybrid membrane can be considered as a promising ion exchange membrane for advanced VRFB system.
Sulfonated poly(phenylene oxide)/graphene oxide composite membrane for vanadium redox flow battery
( Sadhasivam Thangarasu ),정호영,임민화,문건오,박미정,노현준 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Hybrid composite membrane of sulfonated poly(phenylene oxide) (sPPO) and graphene oxide were prepared for advanced vanadium redox flow battery system. Initially, the sulfonation functional group (-SO3H) was introduced in PPO polymer and then the various concentration of graphene oxide (GO) was mixed with sPPO polymer matrix. The inorganic properties of layered structured graphene oxide (GO) was introduced in sPPO polymer matrix for improve the mechanical stability and prevent the vanadium ion crossover. During VRFB unit cell operation, the GO act as barrier for vanadium ion permeability in membrane. Functional group and structural analysis of as prepared materials were confirmed by FTIR, XRD and TEM. Fundamental membrane properties of hybrid membrane were determined through the Degree of sulfonation, water uptake, swelling ratio, ion exchange capacity and ionic conductivity.
( Sadhasivam Thangarasu ),임민화,문건오,박미정,노현준,이정명,정호영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
This study elucidates the preparation of Mischmetal oxide (Mm-oxide) - graphene oxide (GO) nanocomposite for thermal and electrochemical properties. In nanocomposite, the Mm-oxide has supportive in improving the thermal stability of GO. Decreasing the decomposition temperatures of GO occurs by broken sp(2) system in earlier temperature. This result indicates that the Mm-oxide could improve the thermal stability and the decomposition reaction kinetics of GO. The determined non-isothermal activation energies are 137.61 and 107.25 kJ/mol for GO and GO-Mm-oxide composite, respectively. The current density is effectively increased for composite (1.741×10(-5)A) compared to GO (1.341×10(-5)A) and Mm-oxide (1.719×10(-5)A). It indicates that the nanocomposite materials have larger peak current. Therefore, the cost effective nanocomposite can be considered as a promising materials for electrochemical energy applications.
( Sadhasivam Thangarasu ),임민화,문건오,박미정,노현준,이정명,정호영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The Platinum (Pt) nanoparticles were dispersed on the surface of sulfonated silica (SiO2-SO3H) and used as a bifunctional oxygen electrode for the unitized regenerative fuel cell (URFC) system. The electrochemical (ORR) performance of the Pt/SiO2-SO3H and Pt/SiO2 electrocatalysts are 800 mA cm(-2) and 600 mA cm(-2), respectively, at 0.70 V in the FC mode. The electrocatalytic performance of Pt/SiO2-SO3H is 30% higher than the Pt/SiO2 catalyst. In the WE mode, both the sulfonated and non-sulfonated SiO2/Pt electrocatalysts exhibited stable performance. The improved performance of the Pt/SiO2-SO3H catalyst is probably due to the sulfonic acid functional group in the silica support material. Therefore, this work confirms that the silica-supported sulfonation process used in this study is more effective for the improvement of the URFC performance.
Graphitized carbon as a mesoporous layer for unitized regenerative fuel cell applications
( Sadhasivam Thangarasu ),임민화,문건오,노현준,박미정,이정명,정호영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The development and characterization of mesoporous layer (MPL) for application in unitized regenerative fuel cells (URFCs) are reported in this research work. The carbon corrosion is the major effect to the degradation of MEA and electrochemical performances in a unit cell process. Here, we have associated the Graphitized carbon (Gr-carbon) as a MPL in electrodes instead of Gr-carbon as a supportive material to the electrocatalysts. In FC mode, the performance of ORR has significantly improved to addition of MPL in MEA. The potential value of an anode with Gr-carbon MPL is 0.708 V at 1 A cm(-2), it is considerably higher than the non-MPL (0.461 V) and Am-carbon MPL (0.706 V) under identical conditions in FC mode. The round-trip energy efficiency values are 27.24, 41.79 and 43.77 for non-MPL, Am-carbon MPL and Gr-carbon MPL respectively, it revealing that the anode with Gr-carbon MPL has greater efficiency in electrochemical performances for further development to URFC devices.
Organic-inorganic hybrid composite membrane for Vanadium Redox Flow Battery Applications
( Sadhasivam Thangarasu ),정호영,임민화,문건오,박미정,노현준 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Sulfonated poly (phenylene oxide) - nano sized silica (SiO<sub>2</sub>) hybrid composite membrane was prepared for enhance the unit cell performance of vanadium redox flow battery application. Compared to other hydrocarbon polymers, the low cost of PPO were sulfonated through the chlorosulfonic acid (CSA). The inorganic SiO<sub>2</sub> nano particles were dispersed in the polymer matrix through the facile chemical synthetic techniques. Fourier transform infrared spectroscopy FTIR, x-ray diffraction (XRD) and transmission electron microscopy (TEM) analysis were characterized for functional group and structural analysis. The physicochemical characterization of degree of sulfonation (DS), water uptake, swelling ratio, ion exchange capacity (IEC) and ionic conductivity (IC) were measured to the sPPO and hybrid membranes. Compared to various concentration of organic-inorganic materials, the composition of sPPO/1% SiO<sub>2</sub> membrane shows the excellent performances in the physico-chemical characterizations.
( Sadhasivam Thangarasu ),박미정,문건오,임민화,신동석,김건주,이정명,정호영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The cost effective GO-Mm-oxide nanocomposite was successfully synthesized by facile sonochemical technique in an ethanol medium. The current densities are 1.341, 1.719 and 1.741×10-5A for GO, Mm-oxide and nanocomposite, respectively. This higher conductivity of nanocomposite implies that the nanoparticles are anchored on the large surface area of GO. The calculated charge transfer resistance (Rct) values are 4479, 1458 and 1126 ohms for GO, Mm-oxide and composite. The materials of low Rct values can have good conductivity properties and functional to energy applications. We can propose from all the characteristic studies, that the cost effective Mm-oxide will be a better source for making composite with GO for futuristic electrochemical energy storage studies and applications.
Performance evaluation of Nafion/silica composite membranes for redox flow battery
문건오,( Sadhasivam Thangarasu ),이정명,신동석,김건주,임민화,박미정,정호영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Efforts to build a renewable energy to environmental problems caused by the depletion of fossil energy and CO2 emissions are concentrated. to solve this problem, such as the Smart Grid and the ESS has been introduced. Because of redox flow batteries can operate at room temperature and burden on maintenance costs and environmental issues are relatively small, It is advantageous for the energy storage system. But the biggest problem is capacity loss of redox flow battery and lifetime degradation due to cross contamination. In this study, in order to prevent cross contamination in the vanadium redox flow battery, sulfonated silica was dispersed in Nafion solution. and it was prepared by casting a solution of Nafion membrane. By changing the amount of silica was to evaluate the performance of the produced silica/Nafion composite membrane. These membranes for dimensional change, conductivity, impedance, the change in performance was observed over a silica content in accordance with the charge/ discharge test.
Murugan Nagaraj,Thangarasu Sadhasivam,Seo Sol Bin,Choi Yu Rim,Magdum Sahil S.,Oh Tae Hwan,Yoong Ahm Kim 한국탄소학회 2023 Carbon Letters Vol.33 No.3
Biomass-derived porous carbon is an excellent scientific and technologically interesting material for supercapacitor applications. In this study, we developed biomass-derived nitrogen-doped porous carbon nanosheets (BDPCNS) from cedar cone biomass using a simple KOH activation and pyrolysis method. The BDPCNS was effectively modified at different temperatures of 600 °C, 700 °C, and 800 ℃ under similar conditions. The as-prepared BDPCNS-700 electrode exhibited a high BET surface area of 2883 m2 g−1 and a total pore volume of 1.26 cm3 g−1. Additionally, BDPCNS-700 had the highest electrical conductivity (11.03 cm−1) and highest N-doped content among the different electrode materials. The BDPCNS-700 electrode attained a specific capacitance of 290 F g−1 at a current density of 1 A g−1 in a 3 M KOH electrolyte and an excellent long-term electrochemical cycling stability of 93.4% over 1000 cycles. Moreover, the BDPCNS-700 electrode had an excellent energy density (40.27 Wh kg−1) vs power density (208.19 W kg−1). These findings indicate that BDPCNS with large surface areas are promising electrode materials for supercapacitors and energy storage systems.