Journal
CHEMICAL COMMUNICATIONS
Volume 50, Issue 84, Pages 12662-12664Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cc03271c
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Oxygen reduction reactions (ORRs) are of key importance in the area of electrochemical energy production. The replacement of the Pt industrial standard with heteroatom doped metal-free carbon nanotubes was previously suggested for ORRs. Here we will show that the ORR electrocatalysis on these supposedly metal-free materials is likely in fact due to the presence of residual metallic impurities within the carbon nanotubes and that these impurities play a dominant role.
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