Transformation of Metal-Organic Frameworks into Huge-Diameter Carbon Nanotubes with High Performance in Proton Exchange Membrane Fuel Cells
Transformation of Metal-Organic Frameworks into Huge-Diameter Carbon Nanotubes with High Performance in Proton Exchange Membrane Fuel Cells
复制标题
质子交换膜燃料电池中金属有机框架转化为高性能大直径碳纳米管
DOI：
10.1021/acsami.9b03324
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发表时间：
2019
影响因子：
9.5
通讯作者：
Wei Zidong
中科院分区：
文献类型：
--
作者：
Li Wei;Ding Wei;Nie Yao;He Qian;Jiang Jinxia;Wei Zidong
本研究报道了一种利用柠檬酸铁功能化沸石咪唑骨架-8 （ZIF-8）作为前体将金属有机骨架高效转化为大直径碳纳米管（CNTs）的策略。所构建的多孔fe - n修饰CNTs的管径为>0.1 μm，长>5 μm。我们发现，使用柠檬酸铁不仅可以通过自下而上的有机策略促进铁的团聚生成大直径的碳纳米管，还可以通过在ZIF-8中用柠檬酸离子取代2-甲基咪唑来诱导Fe- n位点的形成，使其成为一类很有前途的氧还原反应（ORR） pt替代催化剂。这种理想的结构具有Fe-N的高固有活度和大直径管更快的质量输运，从而具有优异的ORR性能，最大功率密度为665 mW cm-2。
Herein, we report an efficient strategy to transfer metal organic frameworks into huge-diameter carbon nanotubes (CNTs) at high production by using Fe-citrate-functionalized zeolitic imidazolium frameworks-8 (ZIF-8) as precursors. The constructed porous Fe–N-decorated CNTs represent a tube diameter of >0.1 μm and a length of >5 μm. We find that the use of Fe-citrate could not only facilitate the agglomeration of Fe to generate huge-diameter CNTs by the bottom-up organic strategy but also induce the formation of Fe–N sites by the ligand substitution of 2-methylimidazole with citrate ions in ZIF-8, making it a promising class of Pt-alternative catalysts for oxygen reduction reaction (ORR). Such an ideal architecture is endowed with highly intrinsic activity from Fe–N and the faster mass transport from huge-diameter tubes, leading to an excellent ORR performance with a maximum power density of 665 mW cm–2.