کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1273938 | 1497508 | 2014 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Pyrolyzing cobalt diethylenetriamine chelate on carbon (CoDETA/C) as a family of non-precious metal oxygen reduction catalyst Pyrolyzing cobalt diethylenetriamine chelate on carbon (CoDETA/C) as a family of non-precious metal oxygen reduction catalyst](/preview/png/1273938.png)
• Pyrolyzing CoN3 non-macrocycle chelate on carbon as oxygen reduction catalyst.
• A maximum activity is obtained at 800 °C with its Ep = 719 mV (SHE).
• The ORR mechanism for HT800 is mainly a 4e reaction path with its n = 3.85 at 0.5 V.
• N-doping on carbon and α-Co with different sizes are present after pyrolysis.
• A higher total N content in the catalyst does not lead to a higher ORR activity.
Using diethylenetriamine ligand, a family of non-precious metal oxygen reduction catalyst is synthesized by pyrolysis of cobalt-diethylenetriamine chelate on carbon at elevated temperature from 600 to 900 °C. Cyclic voltammetry results show that pyrolysis temperature plays an important impact on improving catalytic activity and the maximum activity is obtained at 800 °C with its peak potential of 719 mV (SHE). For the best catalyst HT800, rotating-ring disk electrode measurement indicates that the number of electrons transferred is 3.80–3.85 at potential of 0.5 V with rotating rates from 100 to 1600 rpm and the catalyst loading of 648 μg cm−2. XRD indicates that the cobalt-nitrogen chelate decomposes above 600 °C and nanometallic α-Co with different sizes is synthesized. Raman indicates that there are more defective sites on the carbon surfaces induced by N doping. Combined XPS data with electrochemical results, it indicates that a higher total N content does not lead to a higher ORR activity.
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 1, 2 January 2014, Pages 267–276