Crystal Structure‐ and Morphology‐Driven Electrochemistry of Iron Oxide Nanoparticles in Hydrogen Peroxide Detection

Advanced Materials Interfaces - Tập 6 Số 3 - 2019
Petr Jakubec1, Ondřéj Malina1, Jiří Tuček1, Ivo Medřík1, Zdenka Medříková1, Petr Slovák1, Josef Kašlík1, Radek Zbořil1
1Regional Centre of Advanced Technologies and Materials Departments of Experimental Physics and Physical Chemistry Faculty of Science Palacký University Olomouc Šlechtitelu˚ 27 783 71 Olomouc Czech Republic

Tóm tắt

AbstractVarious iron oxide nanoparticles with different morphologies are synthesized and subsequently tested for their conductivity and electrocatalytic activity toward hydrogen peroxide. The morphology and chemical and phase composition of iron oxide nanoparticles are evaluated employing scanning electron microscopy, X‐ray diffraction, 57Fe Mössbauer spectroscopy, and Brunauer–Emmett–Teller specific surface area measurements. The electrochemical properties of the as‐prepared sensors are estimated by electrochemical impedance spectroscopy. It is found that α‐Fe2O3 nanoparticles with the sticks morphology exhibit the best conductivity response among all the tested phases and morphologies. Moreover, it is predicted that conductivity of different iron oxides can be connected with a number of vacancies in their crystal structure. Furthermore, the influence of surface area and porosity of the material on the conductivity can be omitted. Finally, the electrocatalytic activity of iron oxide nanoparticles toward hydrogen peroxide is confirmed by means of cyclic voltammetry. The obtained results perfectly reflect those derived from electrochemical impedance spectroscopy and indicate that glassy carbon electrodes modified with the sticks morphology of α‐Fe2O3 hold a huge potential for hydrogen peroxide detection.

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Advanced Materials Interfaces

Tập 6 Số 3

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