Research ArticleNo Access

Facile hydrothermal synthesis of Fe₃O₄ nanoparticle and effect of crystallinity on performances for supercapacitor

Yue Xu

School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, P. R. China

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Ying Zhang

School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, P. R. China

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Xiaolan Song

http://orcid.org/0000-0002-6487-1564

School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, P. R. China

E-mail Address: xlsongtg@126.com

Corresponding author.

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, and

Hanjun Liu

School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, P. R. China

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https://doi.org/10.1142/S179360471950019XCited by:20 (Source: Crossref)

Abstract

Fe₃O₄ nanoparticles were synthesized by a facile hydrothermal method using triethanolamine. Effects of reaction times (2–8h) on crystallinity and electrochemical performances of Fe₃O₄ were investigated. Samples were analyzed by X-ray diffraction, infrared spectroscopy, N₂ adsorption–desorption, scanning electron microscope, galvanostatic charge/discharge, and cyclic voltammetry. Results showed that the crystallinity of Fe₃O₄ was increased with hydrothermal time, and the sample prepared at 2h displayed amorphous structure with small grain size and large surface area of 165.0m²g $^{- 1}$ $^{- 1}$ . The sample exhibited typical pseudocapacitive behavior with capacitance of 383.2Fg $^{- 1}$ $^{- 1}$ at 0.5 Ag $^{- 1}$ $^{- 1}$ in Na₂SO₃ electrolyte. After 2000 cycles, the capacitance retention of Fe₃O₄ at 2h was recorded as 83.6%, much higher than 26.3% for sample at 8h. It indicated that hydrothermal method was an effective approach to obtain amorphous Fe₃O₄, implying the potential application for preparing metal oxide electrode for supercapacitors.

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