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( Mohanraj Vinothkannan ),김애란,유동진 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
In this work, the proton conductivity of Nafion membrane significantly improved by incorporating sulfonated, nitrogen and fluorinated graphene nanoribbons (SO<sub>3</sub>H-NFGNF) as potential multifunctional fillers. The membrane was then exploited as potential candidate for PEMFC operating under low relative humidity condition. SO<sub>3</sub>H-NFGNF/Nafion composite membrane increases the compactness of ionic domains and enhances the water absorption. The 1 wt% SO<sub>3</sub>H-NFGNF was incorporated into the Nafion matrix that constructing efficient paths for proton conduction at the SO<sub>3</sub>H-NFGNF and Nafion interface. The proton conductivity of SO<sub>3</sub>H-NFGNF/Nafion and pristine Nafion membranes were measured at low humidity condition. As a result, SO<sub>3</sub>H-NFGNF/Nafion membrane exhibited higher proton conductivity.
김애란,( Mohanraj Vinothkannan ),김현진,유동진 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Amine functionalized carbon nanotubes (ANCTs) are employed as the potential proton conducting material in the sulfonated poly (ether ether ketone) (SPEEK) matrix. ACNTs tubular like backbone structure make Π-Π stacking with SPEEK aromatic chains; thereby provide extended mechanical strength. Whereas, amino functional groups on surface of ACNTs generate acid-base interactions with sulfonic groups on SPEEK chains, which improves the proton conductivity under low relative humidity. The structural, morphological, physiochemical and electrochemical properties of SPEEK/ACNTs and were explored and compared the obtained results with bare SPEEK. The proton conductivity of SPEEK/ACNTs is found to be few fold better that of bare SPEEK under 20% RH. Consequently, the PEMFC performance of SPEEK/ACNTs is observed to be better than that of bare SPEEK under 20% RH at 60℃. While operate the long-term PEMFC durability around 50 h under identical condition, the SPEEK/ACNTs retain reasonable voltage.
Arukula, Ravi,Vinothkannan, Mohanraj,Kim, Ae Rhan,Yoo, Dong Jin Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.771 No.-
<P><B>Abstract</B></P> <P>In this article, we report a wet reflux strategy for the synthesis of reduced graphene oxide (rGO)/polyaniline (PANI)/Pt-Pd composite, which was exploited as a potential anode catalyst with enhanced methanol oxidation capacity for direct methanol fuel cells (DMFCs). The construction of rGO/PANI/Pt-Pd involves two steps such as synthesis of PANI on GO and in-situ reduction of GO and metal precursors. The spherical shaped Pt-Pd particles with the average size of 3.5 nm are scattered throughout the surface of rGO/PANI, as observed from transmission electron microscope (TEM). PANI tailors the surface of rGO to allow the uniform scattering of Pt-Pd, which is beneficial for adsorption and decomposition of methanol. Besides, PANI generates strong interaction with Pt-Pd through nitride bond, thereby enhances the durability of composite. The cumulative features of rGO/PANI/Pt-Pd include active carbon support, extended architecture of electron conducting channels and number of methanol oxidation centers endows excellent DMFC power density of 117.45 mW/cm<SUP>2</SUP> and concrete cell durability over 70 h. Therefore, the proposed rGO/PANI/Pt-Pd can be used to address various critical issues associated with commercial Pt/C catalyst.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel rGO/PANI/Pt-Pd catalyst had been successfully fabricated. </LI> <LI> rGO/PANI/Pt-Pd catalyst exhibited enhanced catalytic activity toward methanol oxidation. </LI> <LI> The prepared nanocomposite was applied as potential anode in DMFC. </LI> <LI> The enhanced catalytic activity and active carbon/conductive polymer support promoted DMFC performance and durability. </LI> </UL> </P>