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首页> 外文会议>Nanostructures for energy conversion >Nickel Oxide Carbon Nanofiber Composite for Electrochemical Oxidation of Methanol
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Nickel Oxide Carbon Nanofiber Composite for Electrochemical Oxidation of Methanol

机译：氧化镍碳纳米纤维复合材料对甲醇的电化学氧化

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摘要

Electrospun fibers of a mixture of polyvinylpyrrolidone (PVP), polyaniline (PANI) and graphene were stabilized for 2 h at 200 ℃ and then carbonized at 800 ℃ for 5 h. Composites were prepared by depositing Ni(OH)_2 on the carbon nanofibers (CNFs) and calcining them at different temperatures. The composites were characterized using XRD, TEM and SEM. The effect of the calcination temperatures on the electrochemical catalytic properties towards methanol (MeOH) oxidation was studied using cyclic voltammetry and electrochemical impedance spectroscopy. The analysis of the chronoamperometry measurements confirmed a significant increase in the real surface area for the CNF/NiO composite as the calcination temperature increases. The real surface area is increased at calcination temperatures of 400 and 500 ℃ more than 20 times higher than that calcined at 300 ℃. The oxidation of MeOH was not found to be a purely diffusion controlled process. The CNF/NiO composite has shown, not only, a good stability as the potential was cycled between a large potential window, but also, the electrocatalytic properties was enhanced which was attributed to the surface activation during the cyclic process. The impedance parameters were calculated from the EIS measurements proved that this system has two time constants: one for the adsorption and the other for the charge transfer.
机译：聚乙烯吡咯烷酮（PVP），聚苯胺（PANI）和石墨烯的混合物的电纺纤维在200℃下稳定2 h，然后在800℃下碳化5 h。通过将Ni（OH）_2沉积在碳纳米纤维（CNF）上并在不同温度下煅烧来制备复合材料。使用XRD，TEM和SEM对复合材料进行表征。使用循环伏安法和电化学阻抗谱研究了煅烧温度对甲醇（MeOH）氧化电化学催化性能的影响。计时电流分析法的分析证实，随着煅烧温度的升高，CNF / NiO复合材料的实际表面积显着增加。在400和500℃的煅烧温度下，实际表面积的增加比在300℃下煅烧的表面积高20倍以上。没有发现MeOH的氧化是纯扩散控制的过程。 CNF / NiO复合材料不仅显示出良好的稳定性，因为在较大的电位窗口之间循环电势，而且由于循环过程中的表面活化，电催化性能得到了增强。通过EIS测量得出的阻抗参数证明该系统具有两个时间常数：一个用于吸附，另一个用于电荷转移。

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  • 会议地点 Orlando FL(US)
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    A. M. Al-Enizi; A. A. El-Zatahry; A. M. Abdullah; S. S. Al-Deyab;

  • 作者单位

    Petrochemical research chair, Department of chemistry, King Saud University, PO Box: 2455, Riyadh 11451, Riyadh, Kingdom of Saudi Arabia;

    Petrochemical research chair, Department of chemistry, King Saud University, PO Box: 2455, Riyadh 11451, Riyadh, Kingdom of Saudi Arabia ,Advanced Technology and New Materials Research Institute, City of Scientific Research and Technology Applications, New Borg El-Arab City, Alexandria 21934, Egypt;

    Center for Advanced Materials, Qatar University, Doha 2713, Qatar ,Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt;

    Petrochemical research chair, Department of chemistry, King Saud University, PO Box: 2455, Riyadh 11451, Riyadh, Kingdom of Saudi Arabia;

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