α-MnO2 Nanowire-Anchored Highly Oxidized Cluster as a Catalyst for Li-O2 Batteries: Superior Electrocatalytic Activity and High Functionality

Tae Ha Gu; Daniel Adjei Agyeman; Seung Jae Shin; Xiaoyan Jin; Jang Mee Lee; Hyungjun Kim; Yong Mook Kang; Seong Ju Hwang

doi:10.1002/anie.201809205

α-MnO₂ Nanowire-Anchored Highly Oxidized Cluster as a Catalyst for Li-O₂ Batteries: Superior Electrocatalytic Activity and High Functionality

Tae Ha Gu, Daniel Adjei Agyeman, Seung Jae Shin, Xiaoyan Jin, Jang Mee Lee, Hyungjun Kim, Yong Mook Kang, Seong Ju Hwang

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

55 Citations (Scopus)

Abstract

An effective chemical way to optimize the oxygen electrocatalyst and Li-O₂ electrode functionalities of metal oxide can be developed by the control of chemical bond nature with the surface anchoring of highly oxidized selenate (SeO₄ ²⁻) clusters. The bond competition between (Se⁶⁺−O) and (Mn−O) bonds is quite effective in stabilizing Jahn–Teller-active Mn³⁺ state and in increasing oxygen electron density of α-MnO₂ nanowire (NW). The selenate-anchored α-MnO₂ NW shows excellent oxygen electrocatalytic activity and electrode performance for Li-O₂ batteries, which is due to the improved charge transfer kinetics and reversible formation/decomposition of Li₂O₂. The present study underscores that the surface anchoring of highly oxidized cluster can provide a facile, effective way of improving the oxygen electrocatalyst and electrochemical performances of nanostructured metal oxide in Li-O₂ cells.

Original language	English
Pages (from-to)	15984-15989
Number of pages	6
Journal	Angewandte Chemie - International Edition
Volume	57
Issue number	49
DOIs	https://doi.org/10.1002/anie.201809205
Publication status	Published - 2018 Dec 3

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. NRF-2017R1A2A1A17069463) and by the Korea government (MSIT) (No. NRF-2017R1A5A1015365). The experiments at PAL were supported in part by MOST and POSTECH.

Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

Catalysis
Chemistry(all)

Access to Document

10.1002/anie.201809205

Cite this

@article{029322696a6e4fe28cfd6f28de8ed3d9,

title = "α-MnO2 Nanowire-Anchored Highly Oxidized Cluster as a Catalyst for Li-O2 Batteries: Superior Electrocatalytic Activity and High Functionality",

abstract = "An effective chemical way to optimize the oxygen electrocatalyst and Li-O2 electrode functionalities of metal oxide can be developed by the control of chemical bond nature with the surface anchoring of highly oxidized selenate (SeO4 2−) clusters. The bond competition between (Se6+−O) and (Mn−O) bonds is quite effective in stabilizing Jahn–Teller-active Mn3+ state and in increasing oxygen electron density of α-MnO2 nanowire (NW). The selenate-anchored α-MnO2 NW shows excellent oxygen electrocatalytic activity and electrode performance for Li-O2 batteries, which is due to the improved charge transfer kinetics and reversible formation/decomposition of Li2O2. The present study underscores that the surface anchoring of highly oxidized cluster can provide a facile, effective way of improving the oxygen electrocatalyst and electrochemical performances of nanostructured metal oxide in Li-O2 cells.",

author = "Gu, {Tae Ha} and Agyeman, {Daniel Adjei} and Shin, {Seung Jae} and Xiaoyan Jin and Lee, {Jang Mee} and Hyungjun Kim and Kang, {Yong Mook} and Hwang, {Seong Ju}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. NRF-2017R1A2A1A17069463) and by the Korea government (MSIT) (No. NRF-2017R1A5A1015365). The experiments at PAL were supported in part by MOST and POSTECH. Publisher Copyright: {\textcopyright} 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",

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AU - Shin, Seung Jae

AU - Jin, Xiaoyan

AU - Lee, Jang Mee

AU - Kim, Hyungjun

AU - Kang, Yong Mook

AU - Hwang, Seong Ju

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PY - 2018/12/3

Y1 - 2018/12/3

N2 - An effective chemical way to optimize the oxygen electrocatalyst and Li-O2 electrode functionalities of metal oxide can be developed by the control of chemical bond nature with the surface anchoring of highly oxidized selenate (SeO4 2−) clusters. The bond competition between (Se6+−O) and (Mn−O) bonds is quite effective in stabilizing Jahn–Teller-active Mn3+ state and in increasing oxygen electron density of α-MnO2 nanowire (NW). The selenate-anchored α-MnO2 NW shows excellent oxygen electrocatalytic activity and electrode performance for Li-O2 batteries, which is due to the improved charge transfer kinetics and reversible formation/decomposition of Li2O2. The present study underscores that the surface anchoring of highly oxidized cluster can provide a facile, effective way of improving the oxygen electrocatalyst and electrochemical performances of nanostructured metal oxide in Li-O2 cells.

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