Journal
CHEM
Volume 5, Issue 11, Pages 2865-2878Publisher
CELL PRESS
DOI: 10.1016/j.chempr.2019.07.020
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Funding
- National Key R&D Program of China [2017YFA0207301, 2017YFA0207302]
- NSFC [21725102, 21573212, 11874334, 21803063]
- CAS Key Research Program of Frontier Sciences [QYZDB-SSW-SLH018]
- Natural Science Foundation of Anhui Province [1708085MA06]
- Natural Science Foundation of Zhejiang Province [LQ19B010001]
- CAS Interdisciplinary Innovation Team
- Hangzhou Normal University [4095C5021820441]
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Atomically dispersed transition metals anchored on N-doped carbon are identified as a class of promising candidates alternatively to Pt-based catalysts for oxygen reduction reaction but still restricted by the low activity and durability in acidic media. Herein, we report a new strategy for precisely tuning the number of Fe atoms in clusters anchored on N-doped carbon. Such a tunability offers the capabilities of altering O-2 adsorption from superoxo-like to peroxo-like configuration as well as tailoring N species in carbon matrix during pyrolytic catalyst synthesis. As a result, Fe-2 clusters on N-doped carbon display excellent acidic ORR activity with a half-wave potential of 0.78 V versus reversible hydrogen electrode (RHE) as well as remarkable durability with only a -20 mV shift after 20,000 cycles in 0.5 M H2SO4 solution. This work provides insights into non-noble-metal electrocatalyst design at the atomic level from the angle of both active sites and catalyst supports.
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