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Anchored Fe 3 O 4 Nanoparticles on rGO Nanosheets as High‐Power Negative Electrodes for Aqueous Batteries
Author(s) -
Sanchez Jaime S.,
Pendashteh Afshin,
Palma Jesus,
Anderson Marc,
Marcilla Rebeca
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700048
Subject(s) - nanocomposite , materials science , cyclic voltammetry , dielectric spectroscopy , aqueous solution , electrode , electrochemistry , nanoparticle , chemical engineering , raman spectroscopy , oxide , horizontal scan rate , nanotechnology , chemistry , metallurgy , organic chemistry , physics , optics , engineering
Abstract Fe 3 O 4 nanoparticles were anchored on GO nanosheets and evaluated as negative electrode materials for high‐performance aqueous batteries. The prepared samples were characterized by using XRD, Raman spectroscopy, TGA, and TEM. The energy‐storage behavior of the samples was investigated by testing high‐mass‐loaded (ca. 8.5 mg ⋅ cm −2 ) Fe 3 O 4 −rGO electrodes with different electrochemical techniques, including cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. The nanocomposites showed better electrochemical storage properties than pure Fe 3 O 4 nanoparticles and rGO nanosheets, suggesting superior performance through synergistic effects. Accordingly, the Fe 3 O 4 −rGO nanocomposite with an optimized composition of [60 : 40] showed a maximum capacity of 402 C ⋅ g −1 (111.6 mA ⋅ h ⋅ g −1 ) and superior rate capability (ca. 40 % capacity retention with a 20‐fold increase in scan rate) compared to the pure oxide. To further evaluate the applicability of the Fe 3 O 4 −rGO nanocomposite, aqueous batteries based on the Fe 3 O 4 −rGO [60 : 40] nanocomposite as negative electrodes and NiCoMnO 4 as positive electrodes were assembled and examined by using various electrochemical techniques. Fe 3 O 4 −rGO//NiCoMnO 4 cells demonstrated a maximum specific energy of 26 Wh ⋅ kg −1 and a maximum specific power of 6.8 kW ⋅ kg −1 , with a desirable rate capability. All of the obtained results suggest the Fe 3 O 4 −rGO nanocomposite as a promising negative electrode material for high‐power aqueous batteries.