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RISS 인기검색어
- 검색키워드
- 저자 : Rajendiran Jothi, Vasanth (검색결과 4 건)
- 무료
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Karuppasamy, K.,Jothi, Vasanth Rajendiran,Vikraman, Dhanasekaran,Prasanna, K.,Maiyalagan, T.,Sang, Byoung-In,Yi, Sung-Chul,Kim, Hyun-Seok Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.478 No.-
<P><B>Abstract</B></P> <P>Exploring efficient electrocatalyst for H<SUB>2</SUB> evolution reaction (HER) and replacing the noble metal-based catalysts with inexpensive non-noble metal-based HER catalyst is of great importance for the practicality of hydrogen powered clean technologies. Here, we explore a new class of metal organic framework (MOF) composite (NiMo polyhedron) as an active electrocatalyst material for HER application - synthesized through the conventional hydrothermal process. The bimetallic MOF system having grown on Nickel foam (NiMo/NiMoO<SUB>4</SUB>@NC/NF) delivers higher catalytic activity by achieving a current density of 10 mA cm<SUP>−2</SUP> at a low overpotential of 80 mV, with a Tafel slope of 98.9 mV dec<SUP>−1</SUP> (0.5 M H<SUB>2</SUB>SO<SUB>4</SUB>), comparing favorably with the electrochemical enactment of existing bimetallic MOF-based catalysts. The enhanced HER activity of the synthesized MOF, is primarily due to the structural merits of MOF and the synergy between the MOF and the guest species (Ni and Mo metal atoms). Adding to the excellent HER performance, the electrode also exhibits good stability in acidic medium for a prolonged duration of 24 h. Hence, the synthesized low-cost, non-Pt electrode MOFs with its greater HER performance can be an auspicious applicant as an HER catalyst for water splitting and hydrogen generation applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Noble, Pt free alternate electrocatalysts for HER were identified. </LI> <LI> Ni, Mo based bimetallic MOFs were prepared by hydrothermal process. </LI> <LI> The synthesized NiMO-MOFs possessed polyhedron morphology. </LI> <LI> It achieved a current density of 10 mA cm<SUP>−2</SUP> at a low overpotential of 98.9 mV. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Bose, Ranjith,Patil, Bebi,Rajendiran Jothi, Vasanth,Kim, Tae-Hyun,Arunkumar, Paulraj,Ahn, Heejoon,Yi, Sung Chul THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.65 No.-
<P><B>Abstract</B></P> <P>Co<SUB>3</SUB>Se<SUB>4</SUB> on nitrogen doped carbon nanotube (N-CNT) with applications for supercapacitor and hydrogen evolution reaction (HER) is synthesized by pyrolysis and solvothermal processes. The catalyst due to improved electrical conductivity and increased rate of removal of H<SUB>2</SUB> liberated, delivers a high HER activity, by reaching <I>η</I> <SUB>10</SUB> at 174mV and 240mV, Tafel slope of 73.2 and 43.8mVdec<SUP>−1</SUP> in alkaline and acidic medium respectively. Co<SUB>3</SUB>Se<SUB>4</SUB>/N-CNT as supercapacitor electrodes, yields a capacitance of 114Fg<SUP>−1</SUP> at a 2mVs<SUP>−1</SUP> scan rate, with an excellent capacitive retention of 96% of the initial capacitance after 5000 cycles.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Koh, Beom-Soo,Yoo, Jung-Hun,Jang, Eun-Kwang,Jothi, Vasanth Rajendiran,Jung, Chi-Young,Yi, Sung Chul Elsevier 2018 Electrochemistry Communications Vol.93 No.-
<P><B>Abstract</B></P> <P>One major challenge associated with proton exchange membrane fuel cells is to preserve higher proton conductivity under low-humidity atmosphere. Elevation of water uptake in the perfluorinated polymeric membrane is crucial for the facilitated transportation of proton, which dominates the fuel cell performance. Development of an intrinsic mechanism that controls water balance through the membrane electrode assembly (MEA), eliminates the need for external water management system and thus makes the system suitable for portable applications, where size is an important criterion to be considered. Herein, we report a nano-sized dense-structure (NSDS) layer coated onto the conventional catalyst layer, forming a dual-layered electrode architecture that is favorable in promoting the self-humidification process. This self-humidifying layer is fabricated by the electrostatic spray deposition with sufficiently low deposition rate, which allows for a creation of more uniformly distributed porous structure with diameters smaller than 80 nm, enabling recirculation of the water generated for proper humidification. When experimentally investigated, the MEA employing the dual-layered electrode reveals a 3.15 times elevated current density at 0.6 V than conventional MEA under 0% relative humidity. Mechanism for the water retention in the proposed electrode is further evaluated by X-ray computed tomography, which reveals dramatically increased tortuosity of 4.43 for the NSDS layer in comparison to 1.9 for the conventional catalyst layer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Self-humidifying layer is coated onto conventional electrode by electrospraying. </LI> <LI> Proton conductivity is promoted by the retention of water after the use of new electrode. </LI> <LI> Cell performance is dramatically improved particularly at 0% RH. </LI> <LI> Mechanism for the retention of water is suggested by X-ray computed tomography. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>We report a nano-sized dense-structure (NSDS) layer coated onto the conventional catalyst layer for the self-humidification of MEA, fabricated by electrostatic spray deposition. This method allows formation of more uniformly distributed porous structure with diameters smaller than 80 nm, which enables recirculation of the water generated during oxygen reduction reaction and therefore leading to the improved cell performance under 0% RH.</P> <P>[DISPLAY OMISSION]</P>
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