期刊
RSC ADVANCES
卷 3, 期 35, 页码 15375-15381出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra42517g
关键词
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资金
- Ministry of Education Top University Projects [100H451401]
- National Science Council of Taiwan [NSC 101-2221-E-011-047-MY3]
Non-precious metal catalysts are favored for use in microbial fuel cells (MFCs) as they catalyze the oxygen reduction reaction (ORR) at the cathode and are low-cost. In this work, pyrolyzed Vitamin B12 (py-B12/C), supported by carbon black, was utilized as the cathode catalyst in solid phase MFC. The py-B12/C has the highest proportion of quaternary N-type nitrogen than pristine B12, which promotes ORR activity during the pyrolysis at 700 degrees C, at which temperature the ORR ability is maximized. Py-B12/C has an electron transfer number of 3.85 in O-2-saturated 0.05 M phosphate buffered saline (PBS) solution, which is very close to that of Pt/C, which is 3.89. Steady potential tests of py-B12/C and Pt/C reveal that the former does not decay but the latter decays by 24% in 100 h. According to an MFC test, Pt/C has a higher voltage initially but this rapidly falls to zero after ten days owing to the blocking effect of OHads species on Pt surface. Notably, an MFC using py-B12/C exhibits excellent power density of 22.6 mW m(-2) and an operational period of more than 30 days, which is longer than that using Pt/C.
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