Title: Vitalizing fuel cells with vitamins: pyrolyzed vitamin B12 as a non-precious catalyst for enhanced oxygen reduction reaction of polymer electrolyte fuel cells
Authors: Chang, Sun-Tang
Wang, Chen-Hao
Du, He-Yun
Hsu, Hsin-Cheng
Kang, Chih-Ming
Chen, Chia-Chun
Wu, Jeffrey C. S.
Yen, Shi-Chern
Huang, Wen-Fei
Chen, Li-Chyong
Lin, M. C.
Chen, Kuei-Hsien
Department of Applied Chemistry
Issue Date: 1-Jan-2012
Abstract: 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.
URI: http://dx.doi.org/10.1039/c1ee01962g
ISSN: 1754-5692
DOI: 10.1039/c1ee01962g
Volume: 5
Issue: 1
Begin Page: 5305
End Page: 5314
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