High resolution, binder-free investigation of the intrinsic activity of immobilized NiFe LDH nanoparticles on etched carbon nanoelectrodes
| Autor: | Wolfgang Schuhmann, Edgar Ventosa, Stefan Barwe, Patrick Wilde, Corina Andronescu |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Faradaic current Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrocatalyst Electrochemistry 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Catalysis Nanomaterials chemistry.chemical_compound Chemical engineering chemistry Hydroxide General Materials Science Electrical and Electronic Engineering Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Nano Research. 11:6034-6044 |
| ISSN: | 1998-0000 1998-0124 |
| Popis: | The determination of the intrinsic properties of nanomaterials is essential for their optimization as electrocatalysts, however it poses great challenges from the standpoint of analytical tools and methods. Herein, we report a novel methodology that allows for a binder-free investigation of electrocatalyst nanoparticles. The potential-assisted immobilization of a non-noble metal catalyst, i.e., nickel-iron layered double hydroxide (NiFe LDH) nanoparticles, was employed to directly attach small nanoparticle ensembles from a suspension to the surface of etched carbon nanoelectrodes. The dimensions of this type of electrodes allowed for the immobilization of the catalyst material below the picogram scale and resulted in a high resolution towards the faradaic current response. In addition the effect of the electrochemical aging on the intrinsic activity of the catalyst was investigated in alkaline media by means of continuous cyclic voltammetry. A change in the material properties could be observed, which was accompanied by a substantial decrease in its intrinsic activity. |
| Databáze: | OpenAIRE |
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