Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 161, Issue 4, Pages H155-H160Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.003404jes
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Funding
- National Science Foundation of China [51102169, 51272157, 21176155]
- Shanghai Science and Technology Program [13ZR1429000]
- Shanghai College Teacher Scheme [slg 11028]
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Electrochemical and X-ray absorption techniques are applied to determine the influence of pyrolysis and nitrogen-containing precursor loading on the catalytic activity and structure of carbon-supported cobalt triethylenetetramine (CoTETA/C) catalyst. These CoTETA/C catalysts with different nitrogen-containing precursor loadings are synthesized from pyrolyzing cobalt triethylenetetramine supported on carbon at 800 degrees C in Ar atmosphere. For comparison, the as-prepared (without pyrolysis) is also studied. Cyclic voltammograms and rotating disk electrode measurements indicate that the as-prepared presents very low activity, while the CoTETA/C catalysts. with different nitrogen-containing precursor loadings show good catalytic activity and the maximum is found for CoTETA/C catalyst with Co:TETA = 1:4. X-ray absorption measurements at Co and N K edges show that after pyrolysis the CoN4 centers are no longer detected along with little nitrogen atoms inserted into carbon matrix and nanometallic alpha-Co clusters are formed. X-ray diffraction also confirms the presence of nanometallic alpha-Co particles on the catalysts. (c) 2014 The Electrochemical Society.
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