纳米Ni(OH)_2/Ni-Ti-O纳米管阵列复合电极的制备及其对甲醇的电催化氧化性能  

Preparation of Ni-Ti-O Nanotube Arrays Supported Nano-Ni(OH)_2 Electrode and Its Electrocatalytic Oxidation of Methanol

作　　者：谢芸芸 侯广亚[1] 曹华珍[1] 唐谊平[1] 伍廉奎[1] 郑国渠[1] 

机构地区：[1]浙江工业大学,浙江杭州310014

出　　处：《稀有金属材料与工程》2018年第2期636-641,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51101140);浙江省自然科学基金(LY16E010004)

摘　　要：阳极氧化NiTi合金板获得了Ni-Ti-O纳米管阵列(NTOs),并将其在氢气气氛中加热至500℃还原处理2 h。采用简单的溶盐浸渍法,将Ni(OH)_2纳米颗粒负载在NTOs上制备Ni(OH)_2/NTOs/Ni Ti复合电极。采用场发射扫描电子显微镜(FESEM),X射线光电子能谱(XPS)和循环伏安法(CV)表征电极的表面形貌、电极表面的元素价态和其对甲醇氧化的电催化性能。研究了不同浸渍时间和Ni源浓度等工艺参数对电极微观形貌和电催化氧化性能的影响。结果表明:随着浸渍时间的延长和Ni源浓度的增加,电极上负载的催化纳米颗粒尺寸逐渐增大,氧化峰电流密度先升后降。在25℃时,将NTOs依次浸渍在0.2 mol/L NiCl_2·6H_2O乙醇溶液和0.2 mol/L NH_4OH乙醇溶液中各12 h后,可得到电催化性能良好的纳米Ni(OH)_2/NTOs电极,氧化峰电流密度达到38.41 m A·cm^(-2)。经1000次循环后,电极峰电流密度为原来的75.7%,表明纳米Ni(OH)_2/NTOs电极有良好的循环稳定性。Ni-Ti-O nanotube arrays（NTOs） were fabricated by the anodized Ni-Ti alloy and then annealed in hydrogen atmosphere at 500 ℃ for 2 h. The Ni（OH）2/NTOs electrodes were prepared by a convenient impregnating method. The FESEM, XPS and CV were used to characterize the microstructure, surface electronic states and catalytic performance of Ni（OH）2/NTOs. The effect of the process factors such as impregnation time and concentration of Ni^2＋ on catalytic activity were investigated. The results show that with prolonging impregnation time and increasing concentration of Ni^2＋, the catalyst particle size gradually increases and the peak current density firstly increases and then decreases. When the Ni-Ti-O NTs is impregnated in 0.2 mol/L NiCl2·6H2O ethanol solution and 0.2 mol/L NH4OH ethanol solution for 12 h in sequence at 25 ℃, the resulting sample has the best catalytic performance and its peak current density is 38.41 m A·cm^-2. Meanwhile, the peak current density of Ni（OH）2/NTOs remains 75.7% of the original value after a consecutive sweep for 1000 times, indicating its excellent cyclic stability.

关 键 词：直接甲醇燃料电池 镍催化剂 浸渍法 Ni-Ti-O纳米管阵列 电催化氧化 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O643.36[理学—物理化学]