Reduced graphene oxide-supported Pd@Au bimetallic nano electrocatalyst for enhanced oxygen reduction reaction in alkaline media
| Autor: | G. Vishwakshan Reddy, Prakash S. Raghavendra, L. Subramanyam Sarma, R. Sivasubramanian, P. Sri Chandana |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Graphene Ammonia borane Inorganic chemistry Oxide Energy Engineering and Power Technology Nanoparticle Infrared spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis law.invention chemistry.chemical_compound Fuel Technology Chemical engineering chemistry law 0210 nano-technology Bimetallic strip |
| Zdroj: | International Journal of Hydrogen Energy. 43:4125-4135 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2017.07.199 |
| Popis: | Rational design and synthesis of core-shell bimetallic nanoparticles with tailored structural and functional properties is highly sought to realize clean and energy-efficient fuel cell systems. Herein, Pd Au bimetallic nanoparticles (NPs) with core-shell morphology (PdCore–AuShell) were fabricated on the surface of reduced graphene oxide (RGO) support by a facile two-step protocol. In the first step, PdCore–AgShell bimetallic NPs were synthesized on RGO support by reducing Pd2+and Ag+ ions with methyl ammonia borane (MeAB). Later, PdCore–AuShell bimetallic NPs were conveniently fabricated on RGO support via a galvanic replacement strategy involving sacrificial oxidation of metallic silver and reduction of gold ions. The resulting core/shell bimetallic NPs were characterized by X-ray diffraction (XRD), High-resolution transmission electron microscopy (HR-TEM), Energy dispersive X-ray spectroscopy (EDS), Fourier-Transform Infrared Spectroscopy (FT-IR) and cyclic voltrammetry (CV). The electrocatalytic performance of core/shell nanostructures for the room temperature oxygen reduction reaction (ORR) in alkaline media were systematically performed by CV. The electrode-area-normalized ORR activity of RGO-supported PdCore–AuShell NPs was higher than the corresponding commercially available carbon-supported Pt nanoparticles (Pt/C) at −0.8 V vs Ag/AgCl (satd. KCl) (6.24 vs 5.34 mA cm−2, respectively). Further, methanol-tolerant ORR activities of as-synthesized catalysts were also studied. The Au-on-Pd/RGO bimetallic NPs presented enhanced ORR activity both in presence and in the absence of methanol in comparison with a commercial Pt/C catalyst and as-synthesized Pd/RGO and Au/RGO catalysts. The enhanced catalytic activities of core/shell structures might be resulted owing to the optimized core/shell structure comprising of a small Pd core and a thin Au shell and synergistic effects offered by Pd and Au. The present synthesis protocol demonstrated for two-layer structure can be extended to multi-layered structures with desired functions and activities. |
| Databáze: | OpenAIRE |
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