Nickel nanoparticles-decorated graphene as highly effective and stable electrocatalyst for urea electrooxidation
Nickel nanoparticles-decorated graphene as highly effective and stable electrocatalyst for urea electrooxidation
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DOI：
10.1016/j.molcata.2016.05.011
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发表时间：
2016-09-01
影响因子：
--
通讯作者：
Al-Deyab, Salem S.
中科院分区：
文献类型：
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作者：
Barakat, Nasser A. M.;Motlak, Moaaed;Al-Deyab, Salem S.
在各种碳质材料中，石墨烯由于其优异的导电性和极大的表面积而被高度认为是为电催化材料提供最佳载体。在文献中，根据我们最好的知识，很少有研究报告，介绍了有效的电催化剂尿素氧化。在这项研究中，镍修饰的石墨烯片被引入作为有效的和稳定的电催化剂尿素氧化。通过将氧化石墨烯与乙酸镍在120 ° C下回流10小时，然后在氩气气氛中在850 ° C下煅烧2小时来制备引入的复合材料。X射线衍射仪（XRD）、透射电子显微镜（TEM）和拉曼光谱技术证实了由镍纳米颗粒修饰的石墨烯片的形成。所合成的镍修饰石墨烯对尿素的氧化表现出明显的电催化活性。数值上，使用2 M尿素溶液（在1 M KOH中），相应的电流密度为150 mAcm（-2）（2100 mAcm（-2）g（-1）），在正向和反向扫描中具有清晰的尿素氧化峰。研究金属负载量的影响表明，镍纳米颗粒的量应进行优化，因为当在制备过程中使用等量的乙酸镍和氧化石墨烯时观察到最佳性能。引入的修饰石墨烯在各种施加电压下显示出良好的稳定性。总体而言，该研究强调了使用石墨烯作为支撑体以显著增强尿素电氧化的优势。(C)© 2016 Elsevier B. V.版权所有。
Among the various carbonaceous materials, graphene is highly considered to provide the optimum support for the electrocatalytic materials due to its excellent electrical conductivity and extremely large surface area. In literature, based on our best knowledge, few studies have been reported to introduce effective electrocatalysts for urea oxidation. In this study, Ni-decorated graphene sheets are introduced as effective and stable electrocatalyst for urea oxidation. The introduced composite was prepared by reflux of graphene oxide with nickel acetate at 120 degrees C for 10h followed by calcination in argon atmosphere at 850 degrees C for 2 h. X-ray diffractometer (XRD), transmission electron microscope (TEM) and Raman spectroscopy techniques confirmed formation of graphene sheets decorated by nickel nanoparticles. The synthesized Ni-decorate graphene shows distinct electrocatalytic activity toward urea oxidation. Numerically, using 2 M urea solution (in 1 M KOH) the corresponding current density was 150 mAcm(-2) (2100 mAcm(-2) g(-1)) with clear urea oxidation peaks in the forward and reverse scans. Study the influence of metal loading indicated that the amount of nickel nanoparticles should be optimized as the best performance has been observed when equal amounts of nickel acetate and graphene oxides were utilized during the preparation process. The introduced decorated graphene reveals good stability at various applied voltages. Overall, the study emphasizes the advantage of using graphene as support to distinctly enhancing urea electrooxidation. (C) 2016 Elsevier B.V. All rights reserved.