Vitalizing fuel cells with vitamins: pyrolyzed vitamin B12 as a non-precious catalyst for enhanced oxygen reduction reaction of polymer electrolyte fuel cells
Vitalizing fuel cells with vitamins: pyrolyzed vitamin B12 as a non-precious catalyst for enhanced oxygen reduction reaction of polymer electrolyte fuel cells
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DOI：
10.1039/c1ee01962g
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发表时间：
2012-01-01
影响因子：
32.5
通讯作者：
Chen, Kuei-Hsien
中科院分区：
文献类型：
--
作者：
Chang, Sun-Tang;Wang, Chen-Hao;Chen, Kuei-Hsien
铂的有限天然丰度和高成本一直是其应用于氢或甲醇燃料电池的主要障碍。在这项工作中，基于维生素B12的热解咕啉结构（py-B12/C），据报道，在氧还原反应（ORR）中产生上级催化活性，电子转移数为3.90，非常接近理想情况下的4。使用py-B12/C的H-2-O-2燃料电池在0.5 V和70 ℃下提供370 mW cm（-2）的最大功率密度和0.720 A cm（-2）的电流密度。基于密度泛函理论的计算表明，低对称结构的咕啉配合物提供了一个更好的路径的ORR，这是不适用于具有高对称结构的卟啉。py-B12/C的长期稳定性和高ORR活性使其成为ORR中Pt替代物的可行候选物。
The limited natural abundance and high cost of Pt has been a major barrier in its applications for hydrogen or methanol fuel cells. In this work, based on the pyrolyzed corrin structure of vitamin B12 (py-B12/C), it is reported to produce superior catalytic activity in the oxygen reduction reaction (ORR) with an electron transfer number of 3.90, which is very close to the ideal case of 4. The H-2-O-2 fuel cell using py-B12/C provides a maximum power density of 370 mW cm(-2) and a current density of 0.720 A cm(-2) at 0.5 V at 70 degrees C. Calculations based on density functional theory suggests that the corrin complex with a low-symmetric structure offers a much preferable path for the ORR, which is not applicable to the porphyrin with a high-symmetric structure. The long-term stability and high ORR activity of py-B12/C make it a viable candidate as a Pt-substitute in the ORR.