Enhancement of Catalytic Activity of Reduced Graphene Oxide Via Transition Metal Doping Strategy

Lee, Hangil; Hong, Jung A.

doi:10.1186/s11671-017-2196-4

Cited by 10 publications

(1 citation statement)

References 38 publications

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“…In the similar way, Hanwen Xu and his group explored the catalytic properties of 2D MoS 2 based materials for ORR [11]. Hangil Lee asserted the enhanced catalytic activity of rGO by the addition of various transiton metals (Cr, Fe, Co) [12]. Likewise, Yexin Dai et al fabricated transitional metals (Ni, Co, Fe) reduced graphene oxide nanocomposites doped with nitrogen (N) and sulfur (S) for possible applications in fuel cells [13].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Integration of Functionalized N-rGO-Ni/Ag and N-rGO-Ni/Co Nanocomposites as Synergistic Oxygen Electrocatalysts in Fuel Cells

2022

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Fabrication of composites by developing simple techniques can be an efficient way to modify the desire properties of the materials. This paper presents a detailed study on synthesis of low cost and efficient nitrogen doped reduced graphene oxide nickle-silver (N-rGO-Ni/Ag) and nickel-cobalt (N-rGO-Ni/Co) nanocomposites as electrocatalysts in fuel cell using one-pot blended reflux condensation route. An admirable correlation in the structures and properties of the synthesized nanocomposites was observed. The Oxygen Reduction Reaction (ORR) values for N-rGO-Ni/Ag and N-rGO-Ni/Co calculated from the onset potential, using Linear Sweep Voltammetry (LSV), were found to be 1.096 and 1.146. While the half wave potential were determined to be 1.046 and 1.106, respectively, N-rGO-Ni/Ag and N-rGO-Ni/Co. The Tafel and bi-functional (ORR/OER) values were calculated as 76 and 35 mV/decade and 1.23 and 1.12 V, respectively, for N-rGO-Ni/Ag and N-rGO-Ni/Co. The lower onset and half wave potential, low charge transfer resistance (Rct = 1.20 Ω/cm2) and internal solution resistance (Rs = 8.84 × 10−1 Ω/cm2), lower Tafel values (35 mV), satisfactory LSV measurements and mass activity (24.5 at 1.056 V for ORR and 54.9 at 1.056 for OER) demonstrate the remarkable electrocatalytic activity of N-rGO-Ni/Co for both ORR and OER. The chronamperometric stability for synthesized nanocomposites was found satisfactory up to 10 h.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Integration of Functionalized N-rGO-Ni/Ag and N-rGO-Ni/Co Nanocomposites as Synergistic Oxygen Electrocatalysts in Fuel Cells

2022

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Synthesis of GO and rGO@Fe₃O₄@Ni as remarkable nanocatalyst systems for solvent‐free and chemoselective coupling reactions of dimedone with aromatic aldehydes

Esmati

Zeynizadeh

2021

Applied Organom Chemis

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In this work, we synthesized modified GO and rGO@Fe3O4@Ni nanocomposite. The synthesized nanomaterials were characterized using Fourier‐transform infrared spectroscopy (FT‐IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy‐dispersive X‐ray spectroscopy (EDX), X‐ray powder diffraction (XRD), vibrating sample magnetometer (VSM), Brunauer‐Emmett‐Teller (BET), and inductively coupled plasma optical emission spectroscopy (ICP‐OES). Furthermore, GO and rGO@Fe3O4@Ni were applied as catalysts in multicomponent coupling reactions (MCRs) of dimedone with structurally diverse aromatic aldehydes. All reactions were fulfilled rapidly and efficiently in solvent‐free conditions at 90°C. The results showed that GO and rGO@Fe3O4@Ni expedited the coupling reactions chemoselectively in such a way that GO directed the MCRs to the production of bisdimedones while rGO@Fe3O4@Ni drove the reactions one more step forward and afforded xanthenediones as the cyclization products. In addition, reusability of the examined nanocatalyst systems was carried out for four consecutive cycles without the significant loss of catalytic activity.

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Solvothermal Synthesis of Mesoporous 3D‐CuCo₂O₄ Hollow Tubes as Efficient Electrocatalysts for Methanol Electro‐Oxidation

et al. 2019

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Transition metal oxides have attracted attention as promising electrode materials for energy storage and conversion devices with high electrochemical activity and stability. In this study, a simple and cost-effective solvothermal synthesis of rectangular 3D CuCo 2 O 4 hollow tubes have been developed for methanol electro-oxidation application. Electrochemical analysis shows that CuCo 2 O 4 hollow tubes exhibit superior electrochemical performance in terms of current density and cycling stability, with 75 mA cm À 2 and 90 % retention rate after 1000 cycles, respectively. The high electrochemical performances are mainly due to the morphological structure of CuCo 2 O 4 hollow tubes, which possess high surface area and porosity, resulting to a faster electron-ion transfer, enhanced reactivity and stability. Given that the synthesis of CuCo 2 O 4 hollow tubes involve a facile and cost-effective technique, the present approach, thus, opens a new era to novel materials for large-scale processes in different electrochemical applications.

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Enhancement of Catalytic Activity of Reduced Graphene Oxide Via Transition Metal Doping Strategy

Cited by 10 publications

References 38 publications

Fabrication and Integration of Functionalized N-rGO-Ni/Ag and N-rGO-Ni/Co Nanocomposites as Synergistic Oxygen Electrocatalysts in Fuel Cells

Fabrication and Integration of Functionalized N-rGO-Ni/Ag and N-rGO-Ni/Co Nanocomposites as Synergistic Oxygen Electrocatalysts in Fuel Cells

Synthesis of GO and rGO@Fe₃O₄@Ni as remarkable nanocatalyst systems for solvent‐free and chemoselective coupling reactions of dimedone with aromatic aldehydes

Solvothermal Synthesis of Mesoporous 3D‐CuCo₂O₄ Hollow Tubes as Efficient Electrocatalysts for Methanol Electro‐Oxidation

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Enhancement of Catalytic Activity of Reduced Graphene Oxide Via Transition Metal Doping Strategy

Cited by 10 publications

References 38 publications

Fabrication and Integration of Functionalized N-rGO-Ni/Ag and N-rGO-Ni/Co Nanocomposites as Synergistic Oxygen Electrocatalysts in Fuel Cells

Fabrication and Integration of Functionalized N-rGO-Ni/Ag and N-rGO-Ni/Co Nanocomposites as Synergistic Oxygen Electrocatalysts in Fuel Cells

Synthesis of GO and rGO@Fe3O4@Ni as remarkable nanocatalyst systems for solvent‐free and chemoselective coupling reactions of dimedone with aromatic aldehydes

Solvothermal Synthesis of Mesoporous 3D‐CuCo2O4 Hollow Tubes as Efficient Electrocatalysts for Methanol Electro‐Oxidation

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Synthesis of GO and rGO@Fe₃O₄@Ni as remarkable nanocatalyst systems for solvent‐free and chemoselective coupling reactions of dimedone with aromatic aldehydes

Solvothermal Synthesis of Mesoporous 3D‐CuCo₂O₄ Hollow Tubes as Efficient Electrocatalysts for Methanol Electro‐Oxidation