Na_2SeO_3在Fe电极上还原和吸附机理  

Mechanism of Na_2SeO_3 Reduction and Adsorption on Fe Electrode

作　　者：符德学[1] 缪绢[2] 王云燕[3] 舒余德[3] 

机构地区：[1]焦作大学化学工程系,焦作454100 [2]焦作工学院,焦作454100 [3]中南大学冶金科学与工程系,长沙410083

出　　处：《物理化学学报》2002年第10期956-960,共5页Acta Physico-Chimica Sinica

摘　　要：采用循环伏安法、恒电势电解法、恒电流阶跃法及交流阻抗法研究Na2SeO3提高锌锰合金电沉积电流效率的作用机理.证明在锌锰合金电沉积的条件下,Na2SeO3阴极被还原为Se_3～2-并吸附在阴极表面上,从而阻止了氢原子在阴极表面的吸附,因而减少了氢离子的阴极还原.拟定了Na2SeO3的反应和吸附机理,用交流阻抗法进一步证明了所拟机理的正确性.It is found by experiment that Na2SeO3 can improve the current efficiency remarkably. The reaction mechanism of the promotion of the current efficiency of electrodeposition of Zn-Mn alloy by the addition of Na2SeO3 to the cathode has been studied by cyclic voltammetry, linear sweep voltammetry, chronopotentiometry and electro-chemical impedance methods. It is found that under the conditions of Zn-Mn alloys electro-deposition, Na2SeO3 is reduced to Se-3(2-), which is adsorbed on the surface of cathode, because of the ad adsorption of Se-3(2-), the adsorption of H is prevented, the partial potential curve of hydrogen moves to negative region about 0. 2 V in the presence of 0. 1 g . L-1 Na2SeO3.

关 键 词：Fe电极 Na2SeO3 还原 吸附 机理 硒酸钠 铁电极 锌锰合金 电沉积 

分 类 号：O646[理学—物理化学]