高等学校化学学报 ›› 1997, Vol. 18 ›› Issue (6): 932.

• 论文 • 上一篇    下一篇

碱性介质中高择优取向(220)镍电极上丙醇的电氧化

黄令, 许书楷, 周绍民   

  1. 厦门大学化学系, 厦门, 361005
  • 收稿日期:1996-05-23 出版日期:1997-06-24 发布日期:1997-06-24
  • 通讯作者: 许书楷.
  • 作者简介:黄令, 32岁, 讲师, 博士研究生.
  • 基金资助:

    国家自然科学基金

Electrooxidation of Propanol on Highly Preferred Orientation(220) Nickel Electrode in Alkaline Media

HUANG Ling, XU Shu-Kai, ZHOU Shao-Min   

  1. Department of Chemistry, Xiamen University, Xiamen, 361005
  • Received:1996-05-23 Online:1997-06-24 Published:1997-06-24

摘要: 对1.0mol/LNiSO4和0.5mol/LH3BO3体系,控制电位为-1.25V,沉积60min,制得高择优取向镍电极.该镍电极经X射线衍射测定其织构度TC220为92%.采用循环伏安法研究了1mol/LNaOH溶液中高择优取向镍电极上丙醇的电催化氧化机理及活性,结果表明:高择优取向镍电极对正面醇的电催化活性高,对异丙醇的电催化活性小;推导出正丙醇的电氧化动力学方程,运用稳态极化曲线测定了其电氧化过程的动力学参数.Ni(Ⅱ)氧化为Ni(Ⅲ)的反应速度常数K1(E)=5.25×10-13exp(0.488FE/RT),Ni(Ⅲ)还原为Ni(Ⅱ)的反应速度常数K-1(E)=2.46×10-4exp(-0.512FE/RT),Ni(Ⅲ)氧化正丙醇的反应速度常数K2=5.64×10-6L·mol-1s-1.

关键词: 高择优取向镍电极, 正丙醇, 异而醇, 电催化氧化

Abstract: Ni electrode with (220) highly preferred orientation was obtained with potentio-static electrodeposition in the solution containing1.0mol/L NiSO4 and 0. 5 mol/L H3BO3.The Ni electrode deposited at - 1.25 Vfor 60 min was examined with X-ray diffaction. It was shown that the Ni electrode has a highly preferred orientation with texture degree of 92%. The mechanism and catalytic activities of propanol oxidation on the highly preferred orientation (220) Ni electrode were studied with cyclic voltammetry. It was shown that the electrocatalytic activity of the Ni electrode for propanol oxidation is higher than that for iso-propanol. The kinetic equation of propanol electrooxidation was derived. The kinetic param-eters were measured with polarization curves- The rate constant [K1, (E)] for the oxidation of Ni(Ⅱ) to Ni(Ⅲ) is 5. 25×10-13exp(0. 488FE/RT), The rate constant [k-1(E)j]for the re-duction of Ni(Ⅲ) to Ni(Ⅲ) is 2. 46×10-4exp(-0.512FE/RT) and the rate constant (k2)for the oxidation of propanol by Ni(Ⅲ) is 5. 64×10-6 L. mol-1s-1.

Key words: Highly preferred orientation Ni electrode, Propanol, Isopropanol, Electrocatalytic oxidation

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