CaCl_2-NaCl熔盐中Fe^(3＋)电化学行为的循环伏安分析  

Investigation into electrochemical behavior of Fe^(3+) in CaCl_2-NaCl molten salt by cyclic voltammetry method

作　　者：胡宏波 高运明[1,2] 秦庆伟[1,2] 李光强[1,2] Hu Hongbo;Gao Yunming;Qin Qingwei;Li Guangqiang(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Provincial Key Laboratory for New Processes of Iron making and Steel making,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]武汉科技大学钢铁冶金新工艺湖北眚重点实验室,湖北武汉430081

出　　处：《武汉科技大学学报》2018年第4期262-267,共6页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(51174148); 国家自然科学基金委员会-辽宁省人民政府联合基金资助项目(U1508214)

摘　　要：利用ZrO_2(Y_2O_3)固体电解质管集成构建Pt,O_2(air)|ZrO_2作为参比电极的电化学电池,采用循环伏安法在1273、1323、1373、1393K温度下对溶解0.5%Fe2O3的CaCl2-NaCl共晶熔盐中Fe^(3+)的电化学行为进行研究,分析了Fe^(3+)在Pt电极上的还原机理,并计算了电极反应交换电子数、Fe^(3+)扩散系数与Fe^(3+)扩散活化能等电化学参数。结果表明,在实验温度范围内,熔盐中Fe^(3+)在Pt电极上还原为Fe的反应是一步还原并受扩散控制的可逆过程;随着温度升高,Fe^(3+)扩散系数增大,Fe^(3+)扩散活化能为97.91kJ·mol-1。另外,本实验测得的Fe^(3+)扩散系数与文献值基本相符,因此,可以认为利用该电化学电池装置研究溶解有Fe2O3的CaCl2-NaCl溶盐的电化学行为是可行的。An electrochemical cell with Pt,O_2（air）｜ZrO_2 as reference electrode was constructed integrally by using a one-end-closed ZrO_2（Y_2O_3）solid electrolyte tube.Cyclic voltammetry method was applied to study the electrochemical behavior of Fe^（3＋） ion in CaCl_2-NaCl eutectic molten salt containing0.5%Fe_2O_3（mass fraction）at 1273,1323,1373,1393 K.Based on that,the mechanism of Fe^（3＋） reduction on the Pt electrode was analyzed,and the electrochemical parameters such as electron transfer number,Fe^（3＋） diffusion coefficient as well as the corresponding diffusion activation energy were calculated.The results show that within the experimental temperature range,the electrochmical reduction of Fe^（3＋） to Fe on the Pt electrode in the molten salt is a single three-electron transfer and diffusion-controlled reversible process.With the increase of reaction temperature,the diffusion coefficient of Fe^（3＋） increases,and the activation energy of Fe^（3＋） diffusion is 97.91 kJ·mol-1.Moreover,the diffusion coefficient obtained by this research is basically consistent with those in the relevant literature.Therefore,it＇s feasible to investigate the electrochemical behavior of Fe_2O_3-containing CaCl_2-NaCl molten salt with the aid of the established electrochemical cell.

关 键 词：FE2O3 FE3+ CaCl2-NaCl熔盐 电化学行为 循环伏安 ZrO2(Y2O3) 扩散系数 

分 类 号：TF5[冶金工程—钢铁冶金] TQ151[化学工程—电化学工业]