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CVD grown CNTs within iron modified and graphitized carbon aerogel as durable oxygen reduction catalysts in acidic medium£¬Carbon79£¨2014£©518-528. Ó°ÏìÒò×Ó£º6.16 ÔÎÄÕªÒª£ºCNTs were grown on iron-modified mesoporous graphitized carbon aerogel (GCA) at 700 ¡æ,800¡æand 900¡æ using catalytic CVD method. Resultant CNT/GCA materials composition, morphology and structure were studied to understand their electrochemical stability and performance for oxygen reduction reaction (ORR) in acidic medium. CNT growth was increased from 700 ¡æ to 800 ¡æ, dominated by MWCNTs formation. In the temperature range from 800 ¡æto 900 ¡æ, the growth was reduced by forming nanofiber/nanoribbon structures accompanied by MWCNTs. Mesoporosity of CNT/GCA composites declined at 700 ¡æand 800 ¡æ due to MWCNT formation. However, CNT/GCA growth at 900 ¡æimproved mesoporosity with substantial increase in pore volume (¡«3 times of GCA) due to formation of nanofibers and nanoribbons. The structure of CNT/GCAmaterials revealed nitrogen dop-ing and dispersion of FeNx phase. A synergistic contribution of CNT/GCA material structure and morphology to ORR activity was noticed. Among CNT/GCA materials, CNT-800 ¡æ/GCA material showed ORR activity at lowest onset potential of 0.5 V. However, CNT-900 ¡æ/GCA exhibits the highest ORR mass activity, with a half-wave onset potential difference of 120 mV with Pt (40 wt.%)/C. Moreover, CNT-900 ¡æ/GCA demonstrates high selectivity (>3.97) to 4 electron ORR path, excellent methanol tolerance and electrochemical durability which makes it a potential DMFC cathode candidate. ÕªÒªÖÐÎÄ·Ò룺Óô߻¯CVD·½·¨£¬·Ö±ðÔÚ700¡æ¡¢800¡æºÍ900¡æµÄÌõ¼þÏ£¬ÔÚÀë×Ó¸ÄÐԵĽé¿×ʯī»¯Ì¼ÆøÄý½º£¨GCA£©ÉÏÉú³¤CNTs¡£Ñо¿Á˺ϳɵÄCNT/GCA²ÄÁϵÄ×é³É£¬ÐÎòºÍ½á¹¹À´Á˽âËüÃÇÔÚËáÐÔ½éÖÊÖÐÓÃÓÚÑõ»¹Ô·´Ó¦£¨ORR£©µÄµç»¯Ñ§Îȶ¨ÐÔºÍÐÔÄÜ¡£ÓÉ700¡æµ½800¡æCNTµÄÉú³¤ËÙÂÊÔö¼Ó£¬ÓÉMWCNTsµÄÐγɿØÖÆ¡£Î¶ÈÓÉ800¡æ±ä»¯µ½900¡æ£¬Éú³¤ËÙÂʽµµÍÒòΪ°éËæMWCNTsÐγÉÁËÄÉÃ×ÏËά/ÄÉÃ×´ø½á¹¹¡£ÔÚ700¡æºÍ800¡æCNT/GCA¸´ºÏ²ÄÁϵÄÖп×ÂʽµµÍÒòΪMWCNTµÄÐγɡ£È»¶ø£¬ÔÚ900¡æÉú³¤µÄCNT/GCAÌá¸ßÁËÖп×ÂÊ£¬ÒòΪÄÉÃ×ÏËάºÍÄÉÃ×´øµÄÐγɴó·ù¶ÈÌá¸ßÁË¿×Ìå»ý¡£CNT/GCA²ÄÁϵĽṹ³ÊÏÖ³ö²ôÔӵĵªºÍ·ÖÉ¢µÄFeNxÏà¡£CNT/GCA²ÄÁϵĽṹºÍÐÎò¶ÔORR»îÐÔµÄÐͬ×÷ÓÃÊÇÖµµÃ×¢ÒâµÄ¡£ÔÚCNT/GCA²ÄÁÏÖУ¬CNT-800¡æ/GCA²ÄÁϳÊÏÖ³öORR»îÐÔÔÚ×îµÍµÄÆðʼµçѹ0.5V¡£È»¶ø£¬CNT-900¡æ/GCA±íÏÖ³ö×î¸ßµÄORR¿éÌå»îÐÔ£¬¾ßÓÐÆðʼµÄµçÊÆ²»Í¬ÓÚ120mV Pt£¨40wt%£©/C°ë²¨¡£È»¶ø£¬CNT-900¡æ/GCA³ÊÏÖ³ö¸ßÑ¡ÔñÐÔ£¨´óÓÚ3.97£©µ½4µç×ÓORR·¾¶£¬¼«ºÃµÄÄͼ״¼ÐԺ͵绯ѧÎȶ¨ÐÔʹµÃ¸Ã²ÄÁÏÓ¦ÓÃÔÚDMFCÒõ¼«ÉϾßÓкܺõÄǰ¾°¡£ ÏëÃâ·Ñ»ñµÃ¸ÃÎÄÏ׿ɵã»÷Á´½Óhttp://www.tjdrfk.com/news/fdsgf.html ͼƬ5.jpg ͼƬ1.jpg ͼƬ2.jpg ͼƬ3.jpg ͼƬ4.jpg |
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