Preparation of Bi/CNTs Composites by Direct Electrolysis of Bi2O3/CNTs in Deep Eutectic Solvent

doi:10.12068/j.issn.1005-3026.2024.11.006

Abstract

Abstract:

To address the low solubility and slow dissolution rate of metal oxides at low temperatures， a porous Bi₂O₃/CNTs （carbon nanotubes） composite pellet was used as the cathode， and a graphite rod served as the anode to obtain Bi/CNTs composites through direct electrolysis in a deep eutectic solvent electrolyte composed of choline chloride and ethylene glycol. The electrochemical behavior of the electroreduction process of solid Bi₂O₃ was investigated via cyclic voltammetry. A single pair of redox peaks was observed on the cyclic voltammogram， indicating that the electroreduction of solid Bi₂O₃ to Bi is a one?step reduction reaction. The effect of electrolysis voltage on the electro?deoxidation of Bi₂O₃ was studied through constant voltage electrolysis. XRD and EDS analyses confirmed that Bi₂O₃/CNTs were completely reduced to Bi/CNTs at 2.6 V and 80 ℃ with 4 hours. SEM results revealed that increasing the electrolysis voltage led to larger particle sizes and more porous surface structures in the final products. The study provides a simple and environmentally friendly method for preparing metals by direct electrolysis of metal oxides using deep eutectic solvents.

Key words: Bi₂O₃/CNTs, deep eutectic solvent, Bi/CNTs, electrochemical reduction

CLC Number:

TF 817

Wei-jian XUE, Min LI, Yi-fan DENG, Ying LI. Preparation of Bi/CNTs Composites by Direct Electrolysis of Bi₂O₃/CNTs in Deep Eutectic Solvent[J]. Journal of Northeastern University(Natural Science), 2024, 45(11): 1565-1570.

Figures/Tables 7

Fig.1 Linear scan voltammogram of graphite cavity electrode in ChCl-EG DES at 80 ℃

Fig.2 Cyclic voltammogram of graphite cavity electrode filled with Bi2O3 in a ChCl-EG DES at 80 °C

Fig.3 I-t plots of solid Bi2O3/CNTs complex recorded in a ChCl-EG DES at 80 °C under different constant voltages for 4 h

Fig.4 XRD patterns of raw material and the electrolytic products obtained by electrolysis under different constant voltages for 4 h

Fig.5 SEM images of raw material and the electrolytic products obtained by electrolysis under different constant voltages for 4 h（a）—CNTs；（b）—Bi2O3/CNTs；（c）—B2O3/CNTs，放大；（d）—2.2 V；（e）—2.4 V；（f）—2.6 V.

Fig.6 EDS of the electrolytic products obtained by electrolysis under different constant voltages for 4 h at 80 °C

Fig.7 Schematic illustration of the electrochemical reduction mechanism for the solid Bi2O3/CNTs complex in a ChCl-EG DES

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Preparation of Bi/CNTs Composites by Direct Electrolysis of Bi₂O₃/CNTs in Deep Eutectic Solvent

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