TY - JOUR
T1 - Mn-N4 Oxygen Reduction Electrocatalyst
T2 - Operando Investigation of Active Sites and High Performance in Zinc–Air Battery
AU - Han, Xu
AU - Zhang, Tianyu
AU - Chen, Wenxing
AU - Dong, Bo
AU - Meng, Ge
AU - Zheng, Lirong
AU - Yang, Can
AU - Sun, Xiaoming
AU - Zhuang, Zhongbin
AU - Wang, Dingsheng
AU - Han, Aijuan
AU - Liu, Junfeng
N1 - Publisher Copyright:
© 2020 The Authors. Advanced Energy Materials published by Wiley-VCH GmbH
PY - 2021/2/11
Y1 - 2021/2/11
N2 - 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 (E1/2) 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+-N4 is the active site during the oxygen reduction process. Density functional theory reveals that facile electron transfer from MnL+-N4 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-N4 material shows high power density and excellent durability, demonstrating its promising potential to substitute the Pt catalyst in practical devices.
AB - 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 (E1/2) 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+-N4 is the active site during the oxygen reduction process. Density functional theory reveals that facile electron transfer from MnL+-N4 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-N4 material shows high power density and excellent durability, demonstrating its promising potential to substitute the Pt catalyst in practical devices.
KW - manganese catalysts
KW - operando X-ray absorption
KW - oxygen reduction reaction
KW - single-atomic-site catalysts
KW - zinc–air batteries
UR - http://www.scopus.com/inward/record.url?scp=85098448448&partnerID=8YFLogxK
U2 - 10.1002/aenm.202002753
DO - 10.1002/aenm.202002753
M3 - Article
AN - SCOPUS:85098448448
SN - 1614-6832
VL - 11
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 6
M1 - 2002753
ER -