Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202002753
Keywords
manganese catalysts; operando X‐ ray absorption; oxygen reduction reaction; single‐ atomic‐ site catalysts; zinc– air batteries
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Funding
- National Key Research and Development Program of China [2017YFA0206500, 2016YFA0202801, 2018YFA0702000]
- National Natural Science Foundation of China (NSFC)
- Beijing Natural Science Foundation [2204089]
- 111 Project [B16028]
- Fundamental Research Funds for the Central Universities
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Researchers have successfully developed a manganese oxygen reduction electrocatalyst with excellent performance in the alkaline oxygen reduction reaction, where the low-valence MnL+-N-4 is identified as the active site. Density functional theory reveals that facile electron transfer from MnL+-N-4 to adsorbed *OH species is crucial for its excellent electrocatalytic performance.
The development of inexpensive and highly efficient nonprecious metal catalysts to substitute Pt in the alkaline oxygen reduction reaction is an appealing idea in the energy field. Herein, a Mn oxygen reduction electrocatalyst with a half-wave potential (E-1/2) as high as 0.910 V under an alkaline oxygen reduction reaction process is developed, and the dynamic atomic structure change of the highly efficient Mn single-atomic site is investigated using operando X-ray absorption spectroscopy. These results demonstrate that the low-valence MnL+-N-4 is the active site during the oxygen reduction process. Density functional theory reveals that facile electron transfer from MnL+-N-4 to adsorbed *OH species plays a key role in the excellent electrocatalytic performance. Moreover, when assembled as the cathode in a zinc-air battery, this Mn-N-4 material shows high power density and excellent durability, demonstrating its promising potential to substitute the Pt catalyst in practical devices.
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