Polymerizable Ionic Liquid as Nitrogen-Doping Precursor for Co鈥揘鈥揅 Catalyst with Enhanced Oxygen Reduction Activity

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• 作者：Jian Gao ; Na Ma ; Junfeng Zhai ; Tianyan Li ; Wei Qin ; Tingting Zhang ; Zhen Yin
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：August 19, 2015
• 年：2015
• 卷：54
• 期：32
• 页码：7984-7989
• 全文大小：372K
• ISSN：1520-5045

文摘

The Co鈥揘鈥揅 catalyst with higher nitrogen content was fabricated with a polymerizable ionic liquid (PIL) of hydrolyzed vinyl imidazolium dihydrogen phosphate ([HVim]H₂PO₄) as N-doping precursor. The PIL was first prepared and then reacted with Co(NO₃)₂路6H₂O. The N-doped Co-based catalyst was then obtained after carbonization process at 600 掳C. The electrochemical characterization indicated that the electroactivity of catalyst prepared with PIL shows higher activity toward oxygen reduction reaction (ORR) than that of the sample prepared with non-IL precursor or nonpolymerizable IL under similar conditions. The ORR onset potential of the C₁ (PIL as precursor) was approximately 100 mV higher than the counterpart prepared with C₂ (non-IL precursor) or C₃ (nonpolymerizable IL precursor) in basic electrolyte. The XPS results demonstrated that C₁ contains higher nitrogen with more pyridinic and pyrrolic nitrogen groups, which was favorable for ORR.