Abstract
We investigated a rapid thermal annealing process for the preparation of carbon nanotube based electrocatalysts. The non-nitrogen doped defective carbon catalysts generated using the rapid thermal annealing (RTA) process performed for 32 s until 900 °C showed the best oxygen reduction reaction (ORR) activity in 0.1 M HClO4 with onset potential reaching as high as 0.77 V vs. RHE. The RTA process was also found to be advantageous in the ORR activation of defective MWCNT (DMWNT), because the DMWNTs annealed for a shorter time showed better ORR activity and higher defect content. In addition, the importance of a defective structure and the active site obtained through the formation of topological defects during the removal of CO desorbing O-functionalities was further demonstrated by the perfect recovery of ORR activity and current density after degradation test.
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