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- 저자 : Ganesan Vinoth (검색결과 4 건)
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Ganesan, Vinoth,Ramasamy, Parthiban,Kim, Jinkwon Elsevier 2017 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.42 No.9
<P><B>Abstract</B></P> <P>Developing highly efficient and cost-effective electrocatalysts for oxygen evolution reaction (OER) is crucial for renewable energy storage technologies. Here, we synthesized hierarchical Co-based bimetallic sulfide nanostructures as an efficient electrocatalyst for OER. Ni<SUB>3.5</SUB>Co<SUB>5.5</SUB>S<SUB>8</SUB> nanostructures were synthesized by solvothermal sulfurization and thermal annealing of pre-synthesized homogenous bimetallic metal–organic frameworks (MOFs). Electron microscopy studies revealed that the Ni<SUB>3.5</SUB>Co<SUB>5.5</SUB>S<SUB>8</SUB> has hollow nanocage like morphology with thin nanosheets grown on the surface. In addition, Co<SUB>9</SUB>S<SUB>8</SUB> hollow nanocages were also synthesized for comparative electrocatalytic evaluation with the Ni<SUB>3.5</SUB>Co<SUB>5.5</SUB>S<SUB>8</SUB> nanosheet-assembled hollow nanocages (NAHNs). The Ni<SUB>3.5</SUB>Co<SUB>5.5</SUB>S<SUB>8</SUB> NAHNs has exhibited a low overpotential of 333 mV at the current density of 10 mA cm<SUP>−2</SUP> (1.563 V <I>vs</I> RHE) and Tafel slope of 48.5 mV dec<SUP>−1</SUP> for the oxygen evolution reaction in 1 M KOH. Benefitting from their structural merits, Ni<SUB>3.5</SUB>Co<SUB>5.5</SUB>S<SUB>8</SUB> NAHNs manifest excellent OER electrocatalytic activity compared to most of the recently reported non-precious catalyst for OER.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hierarchical Ni<SUB>3.5</SUB>Co<SUB>5.5</SUB>S<SUB>8</SUB> nanosheet assembled hollow nanocages (NAHNs) were successfully synthesized. </LI> <LI> Ni<SUB>3.5</SUB>Co<SUB>5.5</SUB>S<SUB>8</SUB> NAHNs provide high porous nature and large surface area. </LI> <LI> Explored as efficient, low potential electrocatalyst to drive the oxygen evolution reaction. </LI> <LI> Ni<SUB>3.5</SUB>Co<SUB>5.5</SUB>S<SUB>8</SUB> NAHNs catalyst exhibited better OER stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Ganesan, Vinoth,Kim, Jinkwon Elsevier 2018 Materials letters Vol.223 No.-
<P><B>Abstract</B></P> <P>Hollow nanoparticles with tailored shell structures have been attractive for electrochemical energy storage applications. CoSe<SUB>2</SUB> nanoboxes (NBs) were synthesized successfully using Co-Prussian blue analogue (PBA) metal organic framework (MOF) as a template. Co-PBA NBs were obtained by etching the cube-shaped crystals of Co-PBA with ammonia. Subsequent selenization of Co-PBA NBs afforded CoSe<SUB>2</SUB> NBs. Due to the hollow and conductive nature, the CoSe<SUB>2</SUB> NBs provided excellent electrocatalytic activity for oxygen evolution reaction (OER). In 1 M KOH aqueous solution, CoSe<SUB>2</SUB> NBs delivered overpotential of 335 mV at a current density of 10 mA cm<SUP>−2</SUP>, Tafel slop of 54.2 mV dec<SUP>−1</SUP>, and good cycling stability, suggesting possibility of being used as a electrochemical catalyst for alkaline fuel cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Prussian blue analogue-derived synthesis of CoSe<SUB>2</SUB> nanoboxes. </LI> <LI> Excellent catalytic performance due to large active sites and metallic nature of CoSe<SUB>2</SUB> hollow structures. </LI> <LI> Superior electrocatalytic oxygen evolution reaction activity with low overpotential and Tafel slope. </LI> <LI> Long-term stability in alkaline aqueous solution. </LI> </UL> </P>
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Ganesan Vinoth,Kim Jinkwon 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.4
Colloidal Cu2GeSe3 nanosheets (NSs) (0.5–1.5 μm) and Cu2GeSe3 nanoparticles (NPs) (8–10 nm) were synthesized for electrochemical performance comparison. The galvanostatic measurements show the maximum capacitance of 118 F/g and 77 F/g for Cu2GeSe3 NSs and NPs, respectively. Each type of nanomaterials exhibits shape dependence in its capacitance reduction behavior with increasing current density due to differences in surface area and electrical conductivity. The cyclic stability tests for Cu2GeSe3 NSs showed a capacity retention of about 90% after 1000 cycles.
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Porous polyhedral carbon matrix for high‑performance Li/Na/K‑ion battery anodes
Vinoth Ganesan,Young‑Han Lee,Heechul Jung,Cheol‑Min Park 한국탄소학회 2023 Carbon Letters Vol.33 No.7
A carbon matrix for high-capacity Li/Na/K-alloy-based anode materials is required because it can effectively accommodate the variation in the volume of Li/Na/K-alloy-based anode materials during cycling. Herein, a nanostructured porous polyhedral carbon (PPC) was synthesized via a simple two-step method consisting of carbonization and selective acid etching, and their electrochemical Li/Na/K-ion storage performance was investigated. The highly uniform PPC, with an average particle size of 800 nm, possesses a porous structure and large specific surface area of 258.82 cm2 g– 1. As anodes for Li/Na/K-ion batteries (LIBs/NIBs/KIBs), the PPC matrix exhibited large initial reversible capacity, fast rate capability (LIB: ~ 320 mAh g– 1 at 3C; NIB: ~ 140 mAh g– 1 at 2C; KIB: ~ 110 mAh g– 1 at 2C), better cyclic performance (LIB: ~ 550 mAh g– 1; NIB: ~ 210 mAh g– 1; KIB: ~ 190 mAh g– 1 at 0.2C over 100 cycles), high ionic diffusivity, and excellent structural robustness upon cycling, which demonstrates that the PPC matrix can be highly used as a carbon matrix for high-capacity alloy-based anode materials for LIBs/NIBs/KIBs.
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