镍氧化膜对 H_2PO_2~- 电氧化的去活化效应

CORC > 厦门大学 > 1999年第5卷

	镍氧化膜对 H_2PO_2~- 电氧化的去活化效应; Deactivation of Nickel Oxide/Hydroxide to Electrooxidation of H 2PO - 2 Anions on Nickel Electrodes in Alkaline Solutions
	蒋太祥 ; 吴辉煌 ; Jiang Taixiang ; Wu Huihuang
刊名	http://electrochem.xmu.edu.cn/CN/abstract/abstract9400.shtml
	1999-08-28
关键词	次亚磷酸盐,电氧化,镍电极 Hypophosphite Electrooxidation Nickel electrode
英文摘要	应用开路电位测量和循环伏安法研究碱性介质中Ｈ２ＰＯ－２在镍电极上的电氧化过程，并对镍氧化膜的去活化机理进行了探讨．结果表明，镍电极在碱性介质中由于氧化膜的快速形成而显示出明显的非催化活性．Ｈ２ＰＯ－２的氧化发生在较负的电位范围，ＨＰＯ２－３为氧化的最终产物．Ｈ２ＰＯ－２的氧化过程分为Ｈ２ＰＯ－２吸附、Ｐ－Ｈ键断裂、活性中间物形成及其氧化等步骤．Ｈ２ＰＯ－２与活性镍充分的相互作用是形成活性基团及随后氧化的必要条件．; Electrooxidation of hypophosphite anions on polycrystalline nickel in alkaline solutions has been investigated by cyclic voltammetry and open circuit potential measurements.The results are explained based on the mechanism that the first step of hypophosphite oxidation is the adsorption of hypophosphite ions on nickel,followed by the homolysis of its hydrogen bond with the formation of radicals.The oxidation of hypophosphite on nickel in alkaline medium occurs at lower potentials between ca.-0.8 V—-1.1 V(SCE)and phosphite ion is the only oxidation product.There is no indication of hypophosphite oxidation at higher potentials.Severe deactivation of the surface occurs when the nickel surface is covered with surface oxide/hydroxide films which separates the hypophosphite ion from nickel substrate.The results show that the rate of the anodic oxidation of hypophosphite depends strongly on the nature of the nickel substrate,operation temperature,hypophosphite concentration and sweep rate.; 作者联系地址：厦门大学化学系!固体表面物理化学国家重点实验室厦门361005,厦门大学化学系!固体表面物理化学国家重点实验室厦门361005; Author's Address: Dept. of Chem.,Xiamen Univ. and State Key Lab. for Phys.Chem. of the Solid Surfaces, Xiamen 361005,P.R.China
语种	中文
出版者	厦门大学《电化学》编辑部
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/57439]
专题	1999年第5卷
推荐引用方式 GB/T 7714	蒋太祥,吴辉煌,Jiang Taixiang,等. 镍氧化膜对 H_2PO_2~- 电氧化的去活化效应, Deactivation of Nickel Oxide/Hydroxide to Electrooxidation of H 2PO - 2 Anions on Nickel Electrodes in Alkaline Solutions[J]. http://electrochem.xmu.edu.cn/CN/abstract/abstract9400.shtml,1999.
APA	蒋太祥,吴辉煌,Jiang Taixiang,&Wu Huihuang.(1999).镍氧化膜对 H_2PO_2~- 电氧化的去活化效应.http://electrochem.xmu.edu.cn/CN/abstract/abstract9400.shtml.
MLA	蒋太祥,et al."镍氧化膜对 H_2PO_2~- 电氧化的去活化效应".http://electrochem.xmu.edu.cn/CN/abstract/abstract9400.shtml (1999).