Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (10): 956-960.doi: 10.3866/PKU.WHXB20021019

• Note • Previous Articles    

Mechanism of Na2SeO3 Reduction and Adsorption on Fe Electrode

Fu De-Xue;Miao Juan;Wang Yun-Yan;Shu Yu-De   

  1. Department of Chemical Engineering, Jiaozuo University, Jiaozuo 454100;Jiaozuo Technology College, Jiaozuo 454100;Department of Metallurgical Science and Engineering, Central South University, Changsha 410083
  • Received:2002-01-15 Revised:2002-04-18 Published:2002-10-15
  • Contact: Miao Juan

Abstract: It is found by experiment that Na2SeO3 can improve the current efficiency remarkably. The reaction mechanism of the promotion of the current efficiency of electro-deposition 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 Se32-, which is adsorbed on the surface of cathode, because of the adsorption of Se32-, 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.

Key words: Na2SeO3, Reduce and adsorption, Mechanism