کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6472425 | 1424137 | 2016 | 8 صفحه PDF | دانلود رایگان |
- Template-free synthesis of a metal-free nitrogen-doped carbon foam.
- Applied as an electrocatalyst for the oxygen reduction reaction in alkaline.
- Electrochemical activity compared with Pt/C and Fe/N/C (Pajarito Powder).
- Comparable catalytic activity to Pt/C achieved, but Fe crucial for high activity.
- Minor catalyst degradation even after 60000 potential cycles: highly stable.
Nitrogen-doped carbon foam (CFN) with large surface area is synthesized via a template-free, scalable combustion technique using diethanolamine as a nitrogen source. The resulting macroporous, open-cell foam has micron-scale hollow cells, surrounded by thin, graphene-like walls. This material is applied as a metal-free electrocatalyst for the oxygen reduction reaction (ORR) in alkaline KOH solution. The activity of this metal-free electrocatalyst at the half-wave potential is just 43Â mV lower than that of platinum-decorated carbon (Pt/CB), but 87Â mV lower than a commercially available Fe-containing non-precious electrocatalyst (Pajarito Powder, PP), suggesting that iron is important in achieving the highest activities. In durability tests measured over 60,000 potential cycles, Pt/CB and PP undergo significant degradation, whilst the non-precious CFN electrocatalyst shows negligible change, indicating high stability of the electrochemical active sites compared with platinum or iron. Such metal-free catalysts therefore show great promise as electrocatalysts for specific alkaline ion exchange membrane fuel cell (AEMFC) applications where long lifetimes are most important.
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Journal: Electrochimica Acta - Volume 220, 1 December 2016, Pages 554-561