期刊
APPLIED SURFACE SCIENCE
卷 496, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.143566
关键词
Fe-UFC/MnO2; Oxygen reduction reaction; Direct methanol fuel cells; Urea-formaldehyde resins
类别
资金
- National Natural Science Foundation of China [51472153, 51572158]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018 JQ2049]
- Shaanxi Provincial Education Department [18JK0106]
- Graduate Innovation Fund of Shaanxi University of Science and Technology
The urea-formaldehyde resins carbon (UFC) and Fe-containing UFC (Fe-UFC) have been prepared by direct carbonization of urea-formaldehyde resins (UF resins) without any surfactants. On this basis, N-doped materials of UFC/MnO2 and Fe-UFC/MnO2 composites were successfully synthesized by the situ redox method. UF resins played both roles of carbon source and nitrogen source. The specific surface areas are 265.7m(2).g(-1) and 229.4 m(2).g(-1) for UFC/MnO2 and Fe-UFC/MnO2, respectively. Direct methanol fuel cells (DMFCs) were assembled with the prepared catalyst as cathode catalyst, polymer fiber membrane (PFM) as electrolyte film and PtRu/C as anode catalyst. DMFCs and cyclic voltammetry (CV) performance tests indicate that Fe-UFC/MnO2-based DMFC displays superior oxygen reduction reaction (ORR) catalytic activity than UFC/MnO2 owing to Fe-N-x existing and a large number of pyridine-N in Fe-UFC/MnO2. The lone pair electrons of pyridine-N can coordinate with transition metal elements and form Fe-N-x groups on Fe-UFC/MnO2, which can be used as the electrocatalytic active sites for ORR. On the other hand, the presence of iron on the prepared catalyst can reduce the band gap, facilitate the transfer from Mn-III to Mn-IV, and provide free electrons for adsorbed O-2 or active oxygen species, thus accelerating the conductivity and ORR catalytic efficiency.
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