Insight into the Origin of the Positive Effects of Imidazolium Salt on Electrocatalytic Activity: Ionic Carbon Nanotubes as Metal‐Free Electrocatalysts for Oxygen Reduction Reaction

Kim, Youn Soo; Shin, Ju Yeon; Jeon, Hyun Ji; Cha, Areum; Lee, Chongmok; Lee, Sang Gi

doi:10.1002/asia.201200800

Cited by 8 publications

(2 citation statements)

References 57 publications

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“…Jeon et al observed enhanced ORR activity of metal‐free sulfonic acid functionalized graphite due to improved adsorption and diffusion of oxygen 62. Kim et al 63 explained the positive effect of the sulfonate group of the imidazolium salt on the ORR by the fact that the sulfonate anion could bring protons present in the electrolyte into vicinity of the electrochemically generated oxygen radical anion species, thereby increasing the rate of ORR. Additionally, it was reported in the literature that the presence of sulfur traces (H 2 S) surprisingly can increase the activity of the Pt ORR catalyst due to electronic effects 64.…”

Section: Discussionmentioning

confidence: 99%

Synthesis, Stabilization and Activation of Pt Nanoparticles for PEMFC Applications

2015

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Amongst the main challenges of catalyst materials for Proton Exchange Membrane Fuel Cells (PEMFCs) are activity and durability. Here we report on the synthesis of monodisperse nanoparticles and stabilization with traces of the surfactant, here Na‐AOT (bis‐(2‐ethylhexyl) sulfosuccinate sodium salt), used in the synthesis procedure. The surfactants prevent agglomeration and reduce Ostwald ripening. We compare the performance of Pt catalyst nanoparticles synthesized in dense microemulsions, Na‐AOT/heptane/water and Triton X‐100/toluene/water, with a commercial state‐of‐the‐art catalyst for the Oxygen Reduction Reaction (ORR). The produced catalyst nanoparticles were extracted onto a carbon support, Vulcan XC‐72R, washed and activated by heat‐treatment, which led to heavy agglomeration, or by electrochemical treatment, which led to an enhanced activity for ORR. Additionally, in comparison to the other two catalysts an increased durability of the platinum nanoparticles synthesized in the microemulsion of Na‐AOT/heptane/water was observed.

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Section: Discussionmentioning

confidence: 99%

Synthesis, Stabilization and Activation of Pt Nanoparticles for PEMFC Applications

2015

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“…(1) CNTs were modified by liquid ionic salts to induce polarization of the π electrons of CNTs, thus accelerating interfacial electron transfer. Kim et al have shown recently that imidazolium salt-functionalized MWCNTs show a high ORR activity, attributed to the induced polarization of the π electrons of CNTs. The zwitterionic MWCNTs functionalized with poly(vinylimidazolium sulfonate) have a more positive surface charge and exhibit a better electrocatalytic activity than the poly(vinylbutylimidazolium chloride)-functionalized MWCNTs.…”

Section: Nanocarbons In Catalytic Reactionsmentioning

confidence: 99%

Nanocarbons for the Development of Advanced Catalysts

2013

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1. Introduction 2. Synthesis of Novel Nanostructured Carbon Materials 2.1. Carbon Nanotubes 2.2. Graphene 2.3. Ordered Mesoporous Carbon 2.4. Carbon Hierarchy 2.5. Macroscopic Shaping of Nanocarbon 3. Functionalization of Nanocarbon Materials 3.1. Liquid-Phase Functionalization of Nanocarbon 3.2. Gas-Phase Functionalization of Nanocarbon 4. Characterization and Modeling 4.1. Characterization of Carbon 4.1.1. Microcalorimetry 4.1.2. Temperature-Programmed and Ambient Pressure Photoelectron Spectroscopy 4.1.3. Advanced Electron Microscopy 4.2. Theoretical Modeling 5. Nanocarbons in Catalytic Reactions 5.1. Enhanced Characteristics as a Support for Catalytic Functionalities 5.2. Stabilization of Small Catalytic Particles with Enhanced Catalytic Behavior 5.3. Direct Catalytic Role of Nanocarbon Functional Groups 5.4. Nanoconfinement 5.5. Electron-Transfer Induced Changes in the Properties of Supported Nanoparticles 5.6. Defect-Related Catalytic Reactivity 5.7. Catalysis by Two-Dimensional Carbon Nanomaterials 6. Concluding Remarks and Perspective

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Conversion of CuO Nanoplates into Porous Hybrid Cu₂O/Polypyrrole Nanoflakes through a Pyrrole‐Induced Reductive Transformation Reaction

Zhu

Liu

et al. 2013

Chemistry An Asian Journal

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Porous hybrid Cu2O/polypyrrole nanoflakes have been synthesized from solid CuO nanoplate templates through the pyrrole-induced reductive transformation reaction at elevated temperature. The conversion mechanism involves the reductive transformation of CuO to Cu2O and the in situ oxidative polymerization of pyrrole to polypyrrole. In addition, the morphology of the as-converted nanohybrids depends on the shape of the CuO precursors. The strategy enables us to transform single-crystalline CuO nanosheets into hollow hybrid Cu2O/polypyrrole nanoframes. The ability to transform CuO and an organic monomer into porous hybrid materials of conducting polymer and Cu2O with macrosized morphological retention opens up interesting possibilities to create novel nanostructures. Electrochemical examinations show that these porous hybrid Cu2O/polypyrrole nanostructures exhibit efficient catalytic activity towards oxygen reduction reaction (ORR), excellent methanol tolerance ability, and catalytic stability in alkaline solution, thus making them promising nonprecious-metal-based catalysts for ORR in alkaline fuel cells and metal-air batteries.

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Insight into the Origin of the Positive Effects of Imidazolium Salt on Electrocatalytic Activity: Ionic Carbon Nanotubes as Metal‐Free Electrocatalysts for Oxygen Reduction Reaction

Cited by 8 publications

References 57 publications

Synthesis, Stabilization and Activation of Pt Nanoparticles for PEMFC Applications

Synthesis, Stabilization and Activation of Pt Nanoparticles for PEMFC Applications

Nanocarbons for the Development of Advanced Catalysts

Conversion of CuO Nanoplates into Porous Hybrid Cu₂O/Polypyrrole Nanoflakes through a Pyrrole‐Induced Reductive Transformation Reaction

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Insight into the Origin of the Positive Effects of Imidazolium Salt on Electrocatalytic Activity: Ionic Carbon Nanotubes as Metal‐Free Electrocatalysts for Oxygen Reduction Reaction

Cited by 8 publications

References 57 publications

Synthesis, Stabilization and Activation of Pt Nanoparticles for PEMFC Applications

Synthesis, Stabilization and Activation of Pt Nanoparticles for PEMFC Applications

Nanocarbons for the Development of Advanced Catalysts

Conversion of CuO Nanoplates into Porous Hybrid Cu2O/Polypyrrole Nanoflakes through a Pyrrole‐Induced Reductive Transformation Reaction

Contact Info

Product

Resources

About

Conversion of CuO Nanoplates into Porous Hybrid Cu₂O/Polypyrrole Nanoflakes through a Pyrrole‐Induced Reductive Transformation Reaction