Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 8, Issue 4, Pages 1104-1112Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cy02415k
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Funding
- National Natural Science Foundation of China [21605067]
- Liaoning Province Excellent Talent Supporting Program [LJQ2015051]
- University of Science and Technology Liaoning [USTL010178]
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Efficient bifunctional electrocatalysts for reversible oxygen electrodes are vitally important for the realization of important future generation electrochemical energy conversion devices, such as regenerative fuel cells and rechargeable metal-air batteries. Importantly, the electrocatalysts need not only be efficient but also inexpensive and source-abundant from the viewpoint of sustainability. Herein, we report active and stable bifunctional catalysts for oxygen electrodes obtained by pyrolysis of pristine coal in ammonia. The pyrolysis yielded nitrogen-rich mesoporous graphitic carbon containing pyrrolic, pyridinic and graphitic groups, which demonstrated very good electrocatalysis of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in 0.1 M NaOH. The optimized catalyst afforded a stable round-trip over-voltage of 0.97 V when cycling between the ORR at a current density of -1.0 mA cm(-2) and the OER at 10 mA cm(-2), lower than those of RuO2 and IrO2 in the same solution, thus unveiling a unique opportunity to directly transform coal into a valuable catalyst without costly processing.
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