Nanocomposite electrodes made of carbon nanofibers and black wax. Anodic stripping voltammetry of zinc and lead
| Autor: | Claire E. Madden, Nicholas J. Van Dijk, Stephen Fletcher, Frank Marken |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Wax
Aqueous solution Nanocomposite Materials science Stripping (chemistry) Carbon nanofiber Analytical chemistry chemistry.chemical_element Zinc Biochemistry Analytical Chemistry Anodic stripping voltammetry chemistry Chemical engineering visual_art Electrode Electrochemistry visual_art.visual_art_medium Environmental Chemistry Spectroscopy |
| Zdroj: | The Analyst. 126:1878-1881 |
| ISSN: | 1364-5528 0003-2654 |
| DOI: | 10.1039/b104816n |
| Popis: | Nanocomposite electrodes offer exciting new possibilities in electroanalytical chemistry. In this preliminary study, nanocomposite electrodes made of carbon nanofibers and black wax were characterized and investigated as novel substrates for metal deposition and stripping processes. Carbon nanofibers were grown from ethylene-hydrogen gas mixtures over Fe-Ni-Cu (85:10:5) nanoparticle catalysts at 600 degrees C and then embedded in Apiezon black wax under vacuum at 140 degrees C. The resulting nanocomposite electrodes showed (i) good conductivity, (ii) a wide potential window in aqueous solutions, (iii) low background currents, (iv) near steady state voltammetric responses with substantial Faradaic currents and (v) sharply peaked fast scan metal stripping responses. Zinc is a notoriously difficult metal to determine in aqueous solutions, because its deposition and stripping are accompanied by hydrogen evolution at extreme negative potentials. It therefore provided a challenging test for our new nanocomposite electrode. Although numerous complications associated with the hydrogen evolution process could not be eliminated, remarkably clear voltammograms could be obtained even at scan rates of 40 V s(-1). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|