Oxygen reduction reaction (ORR) is one of the most important electrochemical reactions in the field of energy storage. Remarkable catalytic properties towards ORR at "metal-free" electrochemically reduced graphene oxide (ErGO) were previously reported. We demonstrate here that the remarkable enhancement towards ORR of a "metal-free" ErGO is caused by residual metallic impurities instead of ErGO itself.
Bibliographical noteFunding Information:
M.P. acknowledges a Tier 2 grant ( MOE2013-T2-1-056 ; ARC 35/13) from the Ministry of Education, Singapore .
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