a-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/ANGE.201809205

a-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 Applied Chemistry

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

14 Scopus citations

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 (SeO²₄) 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 a-MnO₂ nanowire (NW). The selenate-anchored a-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)	16216-16221
Number of pages	6
Journal	Angewandte Chemie - International Edition
Volume	130
Issue number	49
DOIs	https://doi.org/10.1002/ANGE.201809205
State	Published - 3 Dec 2018

Keywords

Li-O battery
bond theory
electrocatalysts
nanostructures
surface anchoring

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title = "a-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 (SeO24) 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 a-MnO2 nanowire (NW). The selenate-anchored a-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.",

keywords = "Li-O battery, bond theory, electrocatalysts, nanostructures, surface anchoring",

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 = "Publisher Copyright: {\textcopyright} 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.",

year = "2018",

month = dec,

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doi = "10.1002/ANGE.201809205",

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T2 - Superior Electrocatalytic Activity and High Functionality

AU - Gu, Tae Ha

AU - Agyeman, Daniel Adjei

AU - Shin, Seung Jae

AU - Jin, Xiaoyan

AU - Lee, Jang Mee

AU - Kim, Hyungjun

AU - Kang, Yong Mook

AU - Hwang, Seong Ju

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 (SeO24) 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 a-MnO2 nanowire (NW). The selenate-anchored a-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.

AB - 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 (SeO24) 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 a-MnO2 nanowire (NW). The selenate-anchored a-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.

KW - Li-O battery

KW - bond theory

KW - electrocatalysts

KW - nanostructures

KW - surface anchoring

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DO - 10.1002/ANGE.201809205

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SN - 1433-7851

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JO - Angewandte Chemie - International Edition

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IS - 49

ER -

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

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