Ni-Mo-PTFE复合电极的制备及其对甲醇电氧化的催化性能  

NiMoPTFE Electrode: Preparation and Catalytic Property on Electrooxidation of Methanol

作　　者：黄令[1] 许书楷[1] 汤皎宁[1] 杨防祖[1] 周绍民[1] 

机构地区：[1]厦门大学化学系

出　　处：《应用化学》1997年第4期21-24,共4页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金

摘　　要：在０．２２ｍｏｌ／Ｌ硫酸镍，０．０６ｍｏｌ／Ｌ钼酸钠，０．３ｍｏｌ／Ｌ柠檬酸钠，３０ｇ／ＬＰＴＦＥ乳液，０．１ｇ／ＬＦＣ－４００表面活性剂的电解液（ｐＨ＝９）中，于温度４５℃，通以１０ｍＡ／ｃｍ２的电流，在纯Ｃｕ片上沉积出Ｎｉ－Ｍｏ－ＰＴＦＥ复合沉积层，ＸＲＤ、ＸＰＳ表征结果表明，该复合沉积层属立方晶系，其点阵型式为面心点阵Ｆ，晶胞参数ａ为０．３５７３ｎｍ，镍钼合金为固溶体结构，其（１１１）织构度ＴＣ（１１１）为６８％，表明该沉积层呈（１１１）择优取向．沉积层表面的氟以（ＣＦ２）ｎ的形式存在，ＳＥＭ观察结果表明沉积层含有ＰＴＦＥ时表面的粗糙度增大．镍－钼－ＰＴＦＥ复合电沉积过程经历吸附态物种氢氧化镍和钼的氧化物，它们继续捕获电子被还原为镍钼合金，ＰＴＦＥ粒子以包埋的形式沉积于镀层中．循环伏安结果表明该复合电极在ＮａＯＨ溶液中对甲醇的电氧化具有催化活性．NiMoPTFE composite electrode was obtained from a mixture containing 022 mol/L NiSO4·6H2O, 006 mol/L Na2MoO4·2H2O, 03 mol/L Na3C6H5O7·2H2O, 30 g/L PTFE and 01 g/L FC400 surfactant (pH=9) in 45 ℃ with current density of 10 mA/cm2. XRD of the composite deposit reveals that it is a face centered cubic solid solution and exhibits (111) preferred orientation. Xray photoelectron energy spectra of the composite deposit indicate that fluorine exists in form of (CF2)n. SEM showed the larger surface roughness of the electrode. The mechanism of NiMoPTFE composite electrodeposition has been discussed. The cyclic voltammetric study showed that the electrocatalytic activity of NiMoPTFE electrode on methanol oxidation is bigger than that of NiMo electrode.

关 键 词：镍 钼 PTFE 复合电极 甲醇 电催化氧化 燃料电池 

分 类 号：O646.54[理学—物理化学] O623.411[理学—化学]