物理化学学报 >> 1988, Vol. 4 >> Issue (04): 445-448.doi: 10.3866/PKU.WHXB19880425

研究简报 上一篇    

NH3/NH4Cl中镍(Ⅱ)-丁二肟体系在悬汞电极上电化学还原机理的研究

金文睿; 姜玮; 杨清峰   

  1. 山东大学化学系, 济南
  • 收稿日期:1987-01-06 修回日期:1987-06-22 发布日期:1988-08-15
  • 通讯作者: 金文睿

A STUDY ON THE MECHANISM OF THE ELECTROCHEMICAL REDUCTION OF NICKEL (Ⅱ) -DIMETHYLGLYOXIME SYSTEM ON HMDE IN NH3/NH4Cl

Jin Wenrui; Jiang Wei; Yang Qingfeng   

  1. Department of Chemistry; Shandong University; Jinan
  • Received:1987-01-06 Revised:1987-06-22 Published:1988-08-15
  • Contact: Jin Wenrui

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Abstract: The behaviour of the Nickel(Ⅱ) ion in the presence of dimethyl-glyoxime (DMG) on the hanging mercury drop electrode in NH_3/NH_4Cl media was investigated with different electrochemical techniques. It was found that: (1) the reactant was Ni(Ⅱ) complex with DMG, Ni(Ⅱ)A_2, adsorbed on the electrode surface; (2) the intermediate was Ni(Ⅰ)A_2 and (3) the product was metal amalgam Ni(0)(Hg). Two electrons were transferred in the overall reaction and the transfer coefficient was 1.8 which was measured experimentally. From experimental results, it was obvious that the reaction orders with respect to Ni(Ⅱ), DMG and H~+ were 1,2, and 1, respectively. A new compound, X, was detected. The reaction scheme could be written as follows
Ni(Ⅱ)A_2+Hg<=>Ni(Ⅱ)A_2(ads)(Hg)
Ni(Ⅱ)A_2(ads)(Hg)+e~-<=>Ni(Ⅰ)A_2(ads)(Hg)
Ni(Ⅰ)A_2(ads)(Hg)+H~++e~-→Ni(0)(Hg)+HA(des)+A~-(des)
→X+Hg