Porous nitrogen doped carbon fiber with churros morphology derived from electrospun bicomponent polymer as highly efficient electrocatalyst for Zn-air batteries

详细信息    查看全文

• 作者：Gi Su Park ; Jang-Soo Lee ; Sun Tai Kim ; Soojin Park ; Jaephil Cho
• 关键词：Oxygen reduction ; Catalysts ; Electrospinning ; N-Doped carbon nanofiber ; Zn&ndash ; air battery
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：1 December, 2013
• 年：2013
• 卷：243
• 期：Complete
• 页码：267-273
• 全文大小：1928 K

文摘

Highly porous nitrogen doped carbon fibers like churros morphology are prepared from a simple and cost-effective fabrication process, electrospinning with bicomponent polymer consisting of polystyrene (PS) and polyacrylonitrile (PAN). From appropriate ratio of two polymer and pyrolysis at 1100?¡ãC, newly churros morphology with extremely high surface area (1271?m²?g^?1) is prepared. During carbonization, more unstable PS than PAN plays a critical role in forming such morphology by acting as sacrifice materials, thus providing additional formation of inner pores and outer etched surfaces. Furthermore, it demonstrates excellent electrocatalytic activity toward ORR, which is attributed to highly meso- and macro porous nitrogen-doped large surface area and enhanced graphitic-nitrogen groups of carbon fibers. For example, the performance of a Zn-air cell based on the nitrogen-doped porous carbon nanofibers exhibits a peak power density of 194?mW?cm^?2, comparable to that based on a commercial Pt/C catalyst (192?mW?cm^?2). Further, the generation of hydrogen peroxide ions (<20 % ) in a half cell is similar to that on the commercial Pt/C catalyst.