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用CVD方法在離子改性的石墨化碳?xì)饽z上生長(zhǎng)CNTs
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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. 影響因子:6.16 原文摘要:CNTs were grown on iron-modified mesoporous graphitized carbon aerogel (GCA) at 700 ℃,800℃and 900℃ 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 ℃ to 800 ℃, dominated by MWCNTs formation. In the temperature range from 800 ℃to 900 ℃, the growth was reduced by forming nanofiber/nanoribbon structures accompanied by MWCNTs. Mesoporosity of CNT/GCA composites declined at 700 ℃and 800 ℃ due to MWCNT formation. However, CNT/GCA growth at 900 ℃improved 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 ℃/GCA material showed ORR activity at lowest onset potential of 0.5 V. However, CNT-900 ℃/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 ℃/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. 摘要中文翻譯:用催化CVD方法,分別在700℃、800℃和900℃的條件下,在離子改性的介孔石墨化碳?xì)饽z(GCA)上生長(zhǎng)CNTs。研究了合成的CNT/GCA材料的組成,形貌和結(jié)構(gòu)來(lái)了解它們?cè)谒嵝越橘|(zhì)中用于氧還原反應(yīng)(ORR)的電化學(xué)穩(wěn)定性和性能。由700℃到800℃CNT的生長(zhǎng)速率增加,由MWCNTs的形成控制。溫度由800℃變化到900℃,生長(zhǎng)速率降低因?yàn)榘殡SMWCNTs形成了納米纖維/納米帶結(jié)構(gòu)。在700℃和800℃CNT/GCA復(fù)合材料的中孔率降低因?yàn)镸WCNT的形成。然而,在900℃生長(zhǎng)的CNT/GCA提高了中孔率,因?yàn)榧{米纖維和納米帶的形成大幅度提高了孔體積。CNT/GCA材料的結(jié)構(gòu)呈現(xiàn)出摻雜的氮和分散的FeNx相。CNT/GCA材料的結(jié)構(gòu)和形貌對(duì)ORR活性的協(xié)同作用是值得注意的。在CNT/GCA材料中,CNT-800℃/GCA材料呈現(xiàn)出ORR活性在最低的起始電壓0.5V。然而,CNT-900℃/GCA表現(xiàn)出最高的ORR塊體活性,具有起始的電勢(shì)不同于120mV Pt(40wt%)/C半波。然而,CNT-900℃/GCA呈現(xiàn)出高選擇性(大于3.97)到4電子ORR路徑,極好的耐甲醇性和電化學(xué)穩(wěn)定性使得該材料應(yīng)用在DMFC陰極上具有很好的前景。 想免費(fèi)獲得該文獻(xiàn)可點(diǎn)擊鏈接http://www.tjdrfk.com/news/fdsgf.html 圖片5.jpg 圖片1.jpg 圖片2.jpg 圖片3.jpg 圖片4.jpg |

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