Preparation and electrochemical performances of silver (alloy) nanoparticles decorated on reduced graphene oxide, using self-polymerization of dopamine in an acidic environment
| Autor: | P.-K. Sun, X. Zhou, Ronald S. Besser, T.-L. Chang, J. Liang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Polymers and Plastics Alloy Oxide Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry Electrochemistry 01 natural sciences Catalysis law.invention Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry law Materials Chemistry Rotating disk electrode Nanocomposite Graphene technology industry and agriculture 021001 nanoscience & nanotechnology 0104 chemical sciences Electronic Optical and Magnetic Materials Surface coating Chemical engineering chemistry engineering 0210 nano-technology |
| Zdroj: | Materials Today Chemistry. 17:100312 |
| ISSN: | 2468-5194 |
| Popis: | Self-polymerization of dopamine, in either an alkaline or an acidic environment, to form polydopamine is a material-independent surface coating technique, influencing almost all areas of material science and engineering. We demonstrated a simple, two-step method to prepare in-situ silver or silver-copper alloy nanoparticles on the surface of reduced graphene oxides, using polydopamine formed in an acidic medium. The acidic medium was created by a nonthermal micro-hollow cathode discharge device and the device was operated at atmospheric pressure, using air as the working gas. The nanocomposites were characterized with SEM, EDX, ICP-OES, and FT-IR; the electrochemical catalytic activity was tested using rotating disk electrode. The characterization methods confirmed the formation of the nanocomposites, which contain polydopamine, reduced graphene oxides, and metal nanoparticles or nanoalloy. We hypothesized that by alloying silver and copper on the surface of reduced graphene oxides, the oxygen reduction reaction (ORR) catalytic activity of the nanocomposites will be enhanced through both alloying and substrate effects. The size range of the nanoparticles is between 10 nm and 15 nm. We find that both the silver and alloy samples catalyze the ORR via a four-electron mechanism. The alloy nanocomposites showed better performance indicator parameters than the silver one, in both mass activity and kinetic current density. This preparation method has paved a new way of synthesizing an ORR catalyst in an environmentally friendly manner. |
| Databáze: | OpenAIRE |
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