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MnMoO 4 Electrocatalysts for Superior Long‐Life and High‐Rate Lithium‐Oxygen Batteries
Author(s) -
Lee GwangHee,
Lee Seun,
Kim JaeChan,
Kim Dong Wook,
Kang Yongku,
Kim DongWan
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201601741
Subject(s) - materials science , electrochemistry , x ray photoelectron spectroscopy , lithium (medication) , oxygen , oxide , catalysis , transition metal , chemical engineering , oxygen evolution , electrode , electrocatalyst , nanowire , nanotechnology , chemistry , medicine , biochemistry , organic chemistry , engineering , metallurgy , endocrinology
Lithium‐oxygen batteries represent a significant scientific challenge for high‐rate and long‐term cycling using oxygen electrodes that contain efficient electrocatalysts. The mixed transition metal oxide catalysts provide the most efficient catalytic activity for partial heterogeneous surface cations with oxygen vacancies as the active phase. They include multiple oxidation states and oxygen vacancies. Here, using a combination of transmission electron microscopy, differential electrochemical mass spectrometry, X‐ray photoelectron spectroscopy, and electrochemical properties to probe the surface of the MnMoO 4 nanowires, it is shown that the intrinsic MnMoO 4 oxygen vacancies on the oxygen electrode are an effective strategy to achieve a high reversibility and high efficiency for lithium‐oxygen (Li‐O 2 ) batteries. The modified MnMoO 4 nanowires exhibit a highly stable capacity at a fixed capacity of 5000 mA h g sp −1 (calculated weight of Super P carbon black) during 50 cycles, a high‐rate capability at a current rate of 3000 mA g sp −1 during 70 cycles, and a long‐term reversible capacity during 188 cycles at a fixed capacity of 1000 mA h g sp −1 . It is demonstrated that this strategy for creating mixed transition metal oxides (e.g., MnMoO 4 ) may pave the way for the new structural design of electrocatalysts for Li‐O 2 batteries.