Hydrogen evolution reaction at PdNPs decorated 1:1 clay minerals and application to the electrocatalytic determination of p-nitrophenol
| Autor: | Melissa Ramel Topet Saheu, Emmanuel Ngameni, Charles Péguy Nanseu-Njiki, Gaëlle Ngnie, Emmanuel Pameté Yambou, Gustave Kenne Dedzo, Christian Detellier |
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| Rok vydání: | 2017 |
| Předmět: |
Aqueous solution
Hydrogen Chemistry General Chemical Engineering Inorganic chemistry chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Electrocatalyst 01 natural sciences Halloysite 0104 chemical sciences Analytical Chemistry Catalysis chemistry.chemical_compound Nitrophenol Ionic liquid engineering 0210 nano-technology |
| Zdroj: | Journal of Electroanalytical Chemistry. 801:49-56 |
| ISSN: | 1572-6657 |
| DOI: | 10.1016/j.jelechem.2017.07.030 |
| Popis: | Hydrogen evolution reaction (HER) was studied on carbon paste electrodes modified by series of 1:1 clay minerals (kaolinite and halloysite) supported palladium nanoparticles (PdNPs). To improve the compatibility of PdNPs with clay minerals, these were functionalized by an imidazolium based ionic liquid. Despite the better accessibility of PdNPs loaded on kaolinite external surfaces, halloysite based materials were the most efficient catalysts for HER, plausibly because of the exceptional localisation of PdNPs in the lumen. The capacity of these materials to easily produce hydrogen was used to develop an original method for the electrocatalytic determination of p -nitrophenol (P-NP) in trace levels in aqueous solution. The catalytic mechanism proceeds via the chemical reduction of p -hydroquinoimine (P-QI) into p -aminophenol (P-AP) by hydrogen, followed by the electrochemical oxidation of the later to yield P-QI. The signal obtained was very stable and five times higher than the one obtained from the direct reduction of P-NP frequently used for its determination. At optimal experimental conditions, a detection limit of 22 nM with a relative standard deviation of 2.5% was obtained. |
| Databáze: | OpenAIRE |
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