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Ultrasonic-assisted synthesis of the ternary-component Ni3AlxFe1-x-layered double hydroxides nanoparticles for oxygen evolution reaction in neutral solution

Abstract

In this work, ultrasonic method, a facile and rapid process, was utilized to preparation of the ternary-component layered double hydroxides (LDHs), Ni3AlxFe1-x-LDHs, as the electrocatalyst materials for oxygen evaluation reaction (OER) in neutral solution. Despite bivalent metal ions such as Ni2+, Co2+ and Zn2+ have been demonstrated to play a highly specialized role in water oxidation or OER, but the role of the trivalent metal ions in LDHs structure within these areas requires a lot of research. So, here, we demonstrated that the Al3+ has a positive effect on the size and bandgap energy of synthesized LDHs, which leads to improvement of the electrochemical performance. According to powder X-ray diffraction and field-emission scanning electron microscopy, it was found that the Al3+ ions could regulate the crystallinity and size of Ni3AlxFe1-x-LDHs nanoparticles. Ni3AlxFe1-x-LDHs were used as electrocatalyst materials in carbon paste electrode (CPE) form toward OER in neutral solution. The obtained results show that the electrocatalytic activity of the Ni3Al0.25Fe0.75-LDH is much better than other binary-component LDHs. The Tafel slope of the OER in 0.1 M phosphate buffer (pH=7) at the ternary-component Ni3Al0.25Fe0.75-LDH electrocatalyst (15 mV/dec) is lower than that of Ni3Fe-LDH (61 mV/dec) and Ni3Al-LDH (98 mV/dec) and also it exhibits a low overpotential for this process. The high electrocatalytic activity of Ni3Al0.25Fe0.75-LDH may be attributed to the co-existence of Al3+ and Fe3+ active sites and also to decrease of its bandgap in compared to Ni3Fe-LDH and Ni3Al-LDH.

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Publication details

The article was received on 29 May 2018, accepted on 11 Jul 2018 and first published on 11 Jul 2018


Article type: Paper
DOI: 10.1039/C8NJ02652A
Citation: New J. Chem., 2018, Accepted Manuscript
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    Ultrasonic-assisted synthesis of the ternary-component Ni3AlxFe1-x-layered double hydroxides nanoparticles for oxygen evolution reaction in neutral solution

    L. Jafari Foruzin, B. Habibi and Z. Rezvani, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02652A

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