Synthesis and electrocatalytic properties of Ag x Au y /Fe 3 O 4 composite microspheres and nanoparticles
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ORIGINAL PAPER
Synthesis and electrocatalytic properties of AgxAuy/Fe3O4 composite microspheres and nanoparticles Lu Pan1 · Qiyong Zhu1 · Li Li1 Received: 17 September 2019 / Accepted: 15 October 2020 © Iranian Chemical Society 2020
Abstract Two synthetic projects were designed to prepare AgxAuy/Fe3O4 composite microspheres and nanoparticles via one-step hydrothermal method. The as-prepared samples were characterized by using XRD, XPS, TEM and SEM techniques, respectively. The AgxAuy/Fe3O4 composite microspheres had the uniform size with 110 nm or so. The size of AgxAuy/Fe3O4 composite nanoparticles was not uniform and Ag and Au nanoparticles were dispersed in Fe3O4. The AgxAuy/Fe3O4 composite microspheres and nanoparticles were modified on glassy carbon electrodes and their electrocatalytic performances for p-nitrophenol reduction in a base medium were investigated. The results show that F e3O4 microspheres and nanoparticles mingled with Au showed higher electrocatalytic activity than the pure Fe3O4. As Fe3O4 was loaded with Ag and Au, the electrocatalytic activity of AgxAuy/Fe3O4 composite microspheres increased first then decreased with increasing Ag content, but the activity of AgxAuy/Fe3O4 composite nanoparticles increased with increasing Ag content. Keywords Double noble metals · AgxAuy/Fe3O4 composites · Electrocatalysis · p-Nitrophenol
Introduction The transition metal oxides are the kind of important inorganic nonmetal materials. Among them, the magnetic Fe3O4 with an inverse spinel structure has been studied extensively recently because of its outstanding functions. Particularly, the nanosized F e3O4 materials nanomaterials have been applied in many spheres including sensor [1], magnetism [2], catalysis [3], biology [4], etc. Particularly, the applications in catalysis of the nanosized F e3O4 materials have been taken seriously. To expand the catalytic application of Fe3O4, the design and synthesis of composite F e3O4 nanomaterials have been carried out. As well known, the noble metals have excellent catalytic activity because of their better electron transmission and outstanding stabilization. Hence, they have been used frequently in fabricating composite nanomaterials. Recently, a larger number of Fe3O4 composite nanomaterials with noble metals have been synthesized [5–10]. It is found * Lu Pan [email protected] 1
School of Chemistry and Materials Engineering, Huainan Normal University, Huainan 232038, Anhui, People’s Republic of China
that the doping of noble metals in F e3O4 can effectively improve or expand the catalytic performance of comparing with the single F e3O4. The main reason may be that both of the doped noble metals and F e3O4 may exhibit synergetic catalysis effect, leading to enhanced catalytic performances [11, 12]. Therefore, the attempt for synthesizing Fe3O4 composites doped with noble metals with different morphologies and structures has been conducted extensively. However, the synthesis of Fe3O4 composites containing noble metals with even and
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