碳纳米管负载高效纳米级Ni_9FeCo催化剂的制备及其水的催化氧化性能研究
摘要
利用溶胶凝胶法制备的多壁碳纳米管负载Ni_9FeCo催化剂(Ni_9FeCo/MWCNTs催化剂)的高效稳定,异于其他稀有金属催化剂(例如碳负载IrO_2和RuO_2)的性能,建立了对于Ni_9FeCo/MWCNTs催化剂为多空疏松高效制氧/制氢高度活泼的催化剂的概念,其Ni_9FeCo晶体与多壁碳纳米管的协同作用大幅推动了吸热反应的进行。Ni_9FeCo催化剂获得了10mA/cm~2碱性介质中由原先260mV的过电位降到加入多壁碳纳米管之后的210mV。其极化曲线的斜率亦由100mV/dec变为60mV/dec。这说明结合多孔疏松的Ni_9FeCo与多壁碳纳米管形成了一个互相交融并极利于传导的框架,使催化中心的电子结构改变。最终Ni_9FeCo/MWCNTs催化剂维持反应360h性能无显著降低。
引文
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