Reduced graphene oxide-supported Pd@Au bimetallic nano electrocatalyst for enhanced oxygen reduction reaction in alkaline media期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Reduced graphene oxide-supported Pd@Au bimetallic nano electrocatalyst for enhanced oxygen reduction reaction in alkaline media

Authors:	P. Raghavendra G. Vishwakshan Reddy R. Sivasubramanian P. Sri Chandana L. Subramanyam Sarma

Affiliation:	1. Nanoelectrochemistry Laboratory, Department of Chemistry, Yogi Vemana University, Kadapa, Andhra Pradesh, India;2. Department of Chemistry, PSG College of Technology, Peelamedu, Coimbatore, 641 004, Tamil Nadu, India;3. Annamacharya Institute of Technology & Sciences, Kadapa, Andhra Pradesh, India

Abstract:	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 (Pd<sub>Core</sub>–Au<sub>Shell</sub>) were fabricated on the surface of reduced graphene oxide (RGO) support by a facile two-step protocol. In the first step, Pd<sub>Core</sub>–Ag<sub>Shell</sub> bimetallic NPs were synthesized on RGO support by reducing Pd<sup>2+</sup>and Ag<sup>+</sup> ions with methyl ammonia borane (MeAB). Later, Pd<sub>Core</sub>–Au<sub>Shell</sub> 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 Pd<sub>Core</sub>–Au<sub>Shell</sub> 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<sup>?2</sup>, 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.</td> </tr> <tr> <td align=$
Keywords:	Electrocatalysis Oxygen reduction reaction Core-shell nanoparticles Graphene oxide support
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