次亚磷酸根离子在多晶铂电极上氧化的原位红外光谱研究  

in-situ IR Spectroscopic Studies of Oxidation of Hypophosphite on Polycrystaline Platinum Electrode

作　　者：蒋太祥[1] 吴辉煌[1] 

机构地区：[1]厦门大学化学化工学院

出　　处：《应用化学》2004年第1期24-27,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金资助课题 (2 0 0 73 0 3 5 )

摘　　要：用SNIFTIRS和循环伏安法研究了酸性溶液和碱性溶液中次亚磷酸根离子在铂电极上的电氧化行为 ,并与镍电极上的反应比较。结果表明 ,铂电极上的吸附物种除氢原子外 ,主要有H2 PO2 (ad) ,最终氧化产物则与电极电位和溶液 pH值有关。当氧化电位不很正时 ,产物是H2 PO -3 (酸性溶液中 )或HPO -3 (碱性溶液中 ) ,而当氧化电位较正时 ,产物是H3 PO4(酸性溶液中 )或PO3 -4(碱性溶液中 )。讨论了氧化反应的可能机理。The electrochemical oxidation of hypophosphite ions on polycrystaline Pt electrode in both acid and alkaline solutions has been studied by SNIFTIRS(Subtractively Normalized Interfacial FTIR Spectroscopy) and cyclic voltammetry, and compared with that on Ni electrode. From the in-situ IR spectra as a function of the electrode potentials, it was concluded that there is H 2PO 2(ad) on Pt as the adsorbed species besides adsorbed hydrogen. The product variety of hypophosphite oxidation on Pt depends on the electrode potentials and the pH values of solutions. At less positive potentials the product is H 2PO - 3 in acidic solution or HPO - 3 in alkaline solution, and at more positive potentials the product is H 3PO 4 in acidic solution or PO 3- 4 in alkaline solution. The mechanism of hypophosphite oxidation on platinum electrode was discussed.

关 键 词：次亚磷酸根离子 电氧化 电催化 SNIFTIRS 

分 类 号：O646[理学—物理化学]