青岛科技大学  English 
李霞
赞  

教师拼音名称:LI

移动电话:

邮箱:

手机版

访问量:

最后更新时间:..

Influence of Fe(III) doping on the crystal structure and properties of hydrothermally prepared &beta;-Ni(OH)<inf>2</inf>nanostructures

关键字:Nickel compounds;Catalyst activity - Crystal structure - Doping (additives) - Energy dispersive spectroscopy - Fourier transform infrared spectroscopy - High resolution transmission electron microscopy - Infrared devices - Iron compounds - Scanning electron microscopy - Solutions - Thermogravimetric analysis - Transmission electron microscopy - X ray powder diffraction;Electrochemical measurements - Energy dispersive X ray spectroscopy - Fourier transform infra red (FTIR) spectroscopy - Interstratification - Iron doping - Nickel hydroxides - Scanning and transmission electron microscopy - Ssbauer spectroscopies

摘要:This paper systematically examines the influence of the level of Fe(III) doping on the crystal structure and other properties of Ni(OH)<inf>2</inf>. Reference &beta;-Ni(OH)<inf>2</inf>and Fe-doped Ni(OH)<inf>2</inf>samples were synthesized by hydrothermal precipitation of mixed Ni(II) and Fe(III) nitrate aqueous solutions in a highly alkaline medium. The samples were investigated using X-ray powder diffraction (XRPD), scanning and transmission electron microscopy (FE-SEM and TEM), energy dispersive X-ray spectroscopy (EDS), M&ouml;ssbauer spectroscopy, magnetic measurements, Fourier transform infrared (FT-IR) spectroscopy, ultraviolet&ndash;visible&ndash;near infrared (UV&ndash;Vis&ndash;NIR) spectroscopy, thermogravimetric analysis (TGA) and electrochemical measurements. Incorporation of Fe in &beta;-Ni(OH)<inf>2</inf>by cation substitution was confirmed from the shifts in position of XRPD lines due to the difference in the ionic radius of Fe<sup>3+</sup>and Ni<sup>2+</sup>. The Fe<sup>3+</sup>-for-Ni<sup>2+</sup>substitution in &beta;-Ni(OH)<inf>2</inf>caused formation of an interstratified structure with &beta;-Ni(OH)<inf>2</inf>and &alpha;-Ni(OH)<inf>2</inf>structural units interconnected within the same structural layers and crystallites. M&ouml;ssbauer spectra revealed the presence of Fe<sup>3+</sup>ions in highly distorted octahedral sites, presumably at the boundary between the &alpha;-Ni(OH)<inf>2</inf>and &beta;-Ni(OH)<inf>2</inf>structural units within the same structural layer. Electrochemical measurements showed significant increase in oxygen evolution reaction (OER) catalytic activity of Fe-doped Ni(OH)<inf>2</inf>compared to pure phase.<br/> &copy; 2018 Elsevier B.V.

卷号:750

期号:

是否译文:

崂山校区 - 山东省青岛市松岭路99号   
四方校区 - 山东省青岛市郑州路53号   
中德国际合作区(中德校区) - 山东省青岛市西海岸新区团结路3698号
高密校区 - 山东省高密市杏坛西街1号   
济南校区 - 山东省济南市文化东路80号©2015 青岛科技大学    
管理员邮箱:master@qust.edu.cn