低共熔溶剂中直接电解Bi_(2)O_(3)/CNTs制备Bi/CNTs复合材料  

Preparation of Bi/CNTs Composites by Direct Electrolysis of Bi_(2)O_(3)/CNTs in Deep Eutectic Solvent

作　　者：薛伟健 李敏[1] 邓逸凡 厉英[1] XUE Wei-jian;LI Min;DENG Yi-fan;LI Ying(Key Laboratory for Ecological Metallurgy of Multimetallic Mineral,Ministry of Education,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报(自然科学版)》2024年第11期1565-1570,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51904068);中央高校基本科研业务费专项资金资助项目(N2325023);辽宁省自然科学基金资助项目(2023-MSBA-091)。

摘　　要：针对低温下金属氧化物溶解度及溶解速率低的现状,以多孔固态Bi_(2)O_(3)/CNTs(碳纳米管)复合圆片作为阴极,石墨棒作为阳极,在氯化胆碱-乙二醇低共熔溶剂电解液中直接进行电解获得Bi/CNTs复合材料.采用循环伏安法研究了固态Bi_(2)O_(3)电还原过程的电化学行为,伏安曲线上只存在一对氧化还原峰,表明固态Bi_(2)O_(3)被电还原为Bi是一步还原反应.采用恒电压电解法研究了电解电压对固态Bi_(2)O_(3)电脱氧的影响,XRD与EDS结果表明,在80℃,2.6 V电解4 h,固态Bi_(2)O_(3)/CNTs被完全电还原为Bi/CNTs;SEM结果表明,电解电压越大,产物的颗粒越大,表面孔隙越疏松.本文结果可为低共熔溶剂直接电解金属氧化物制备金属提供一种简单且绿色的方法.To address the low solubility and slow dissolution rate of metal oxides at low temperatures,a porous Bi_(2)O_(3)/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 Bi_(2)O_(3)was investigated via cyclic voltammetry.A single pair of redox peaks was observed on the cyclic voltammogram,indicating that the electroreduction of solid Bi_(2)O_(3)to Bi is a one‑step reduction reaction.The effect of electrolysis voltage on the electro‑deoxidation of Bi_(2)O_(3)was studied through constant voltage electrolysis.XRD and EDS analyses confirmed that Bi_(2)O_(3)/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.

关 键 词：Bi_(2)O_(3)/CNTs 低共熔溶剂 Bi/CNTs 电化学还原 

分 类 号：TF817[冶金工程—有色金属冶金]