期刊
NANOMATERIALS
卷 11, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/nano11061519
关键词
oxygen reduction reaction; anion exchange membrane fuel cells; Fe-N-C; phosphoric acid doping; SBA-15
类别
资金
- GIST Research Institute (GRI) grant - GIST [GK13650]
The study investigated the effects of phosphoric acid (PA) activation and phosphorus doping on Fe-N-C catalysts, finding that the amount of PA added influenced pore structure and catalytic activity. The electronic states of Fe, N, and P were analyzed, showing stability improvements in Fe-N-C catalysts with the introduction of PA.
The price and scarcity of platinum has driven up the demand for non-precious metal catalysts such as Fe-N-C. In this study, the effects of phosphoric acid (PA) activation and phosphorus doping were investigated using Fe-N-C catalysts prepared using SBA-15 as a sacrificial template. The physical and structural changes caused by the addition of PA were analyzed by nitrogen adsorption/desorption and X-ray diffraction. Analysis of the electronic states of Fe, N, and P were conducted by X-ray photoelectron spectroscopy. The amount and size of micropores varied depending on the PA content, with changes in pore structure observed using 0.066 g of PA. The electronic states of Fe and N did not change significantly after treatment with PA, and P was mainly found in states bonded to oxygen or carbon. When 0.135 g of PA was introduced per 1 g of silica, a catalytic activity which was increased slightly by 10 mV at -3 mA/cm(2) was observed. A change in Fe-N-C stability was also observed through the introduction of PA.
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