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MOF Derived Catalysts for Oxygen Reduction Reaction in Proton Exchange Membrane Fuel Cell

机译：质子交换膜燃料电池中的氧还原反应的MOF衍生催化剂

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Highly porous ZIF-67 (Zeolitic imidazole framework) has a conductive crystalline metal organic framework (MOF) structure which was served as a precursor and template for the preparation of nitrogen-doped carbon nanotubes (NCNTs) electrocatalysts. As a first step, the chloroplatinic acid, a platinum (Pt) precursor was infiltrated in ZIF-67 with a precise amount to obtain 0.12 mg.cm~(-2) Pt loading. Later, the infiltrated structure was calcined at 700 °C in Ar:H_2 (90:10 vol%) gas mixture. Multi-walled nitrogen-doped carbon nanotubes were grown on the surface of ZIF-67 crystals following thermal activation at 700 °C. The resulting PtCo-NCNTs electrocatalysts were deposited on Nafion-212 solid electrolyte membrane by spray technique to study the oxygen reduction reaction (ORR) in the presence of H_2/O_2 gases in a temperature range of 50-70°C. The present study elucidates the performance of nitrogen-doped carbon nanotubes ORR electrocatalysts derived from ZIF-67 and the effects of membrane electrode assembly (MEA) steaming on the performance of proton exchange membrane fuel cell (PEMFC) employing PtCo-NCNTs as ORR electrocatalysts. We observed that the peak power density at 70 C was 450 mW/cm~2 for steamed membrane electrode assembly (MEA) compared to 392 mW/cm2 for an identical MEA without steaming.
机译：高度多孔ZIF-67（沸石咪唑框架）具有导电结晶金属有机骨架（MOF）结构，其用作制备氮掺杂碳纳米管（NCNT）电催化剂的前体和模板。作为第一步，氯铂酸，铂（Pt）前体在ZIF-67中渗透，具有精确的量，得到0.12mg.cm〜（-2）Pt载荷。后来，在Ar 700℃下煅烧渗透结构：H_2（90:10 Vol％）气体混合物。在700℃的热活化后，在ZIF-67晶体的表面上生长多壁氮掺杂碳纳米管。通过喷射技术沉积所得的PTCO-NCNTs电催化剂在Nafion-212固体电解质膜上沉积在50-70℃的温度范围内的H_2 / O_2气体中的氧还原反应（ORR）。本研究阐明了衍生自ZIF-67的氮掺杂碳纳米管的性能，以及膜电极组件（MEA）蒸汽对采用PTCO-NCNT的质子交换膜燃料电池（PEMFC）作为ORR电催化剂的性能的影响。我们观察到，对于蒸膜电极组件（MEA），与392mW / cm 2相比，蒸膜电极组件（MEA）的峰值功率密度为450mW / cm〜2。

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