Magnéli-Phase Ti4O7 Nanosphere Electrocatalyst Support for Carbon-Free Oxygen Electrodes in Lithium-Oxygen Batteries

Seun Lee, Gwang Hee Lee, Jae Chan Kim, Dong-Wan Kim

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Lithium-oxygen batteries have been considerably researched due to their potential for high energy density compared to some rechargeable batteries. However, it is known that the stability of a carbon-based oxygen electrode is insufficient owing to the promotion of carbonate formation, which results in capacity fading and large overpotential in lithium-oxygen batteries. To improve the chemical stability in organic-based electrolytes, alternative electrocatalyst support materials are required. The Ti-O crystal system appears to provide a good compromise between electrochemical performance and cost and is thus an interesting material for further investigation. Here, we investigate a carbon-free electrode with the goal of identifying routes for its successful optimization. To replace carbon materials as an electrocatalyst support, Magnéli Ti4O7 nanospheres were synthesized from anatase TiO2 nanospheres via a controlled thermochemical reduction. The Magnéli Ti4O7 nanospheres demonstrated effective overpotential characteristics (1.53 V) compared to the anatase TiO2 nanospheres (1.91 V) during charge-discharge cycling at a current rate of 100 mA g-1. Additionally, RuO2@Magnéli-Ti4O7 nanospheres were prepared as a bifunctional catalyst-containing oxygen electrode for lithium-oxygen batteries, providing a remarkably reduced overpotential (0.9 V).

Original languageEnglish
Pages (from-to)2601-2610
Number of pages10
JournalACS Catalysis
Volume8
Issue number3
DOIs
Publication statusPublished - 2018 Mar 2

Fingerprint

Nanospheres
Electrocatalysts
Lithium
Catalyst supports
Carbon
Oxygen
Electrodes
Titanium dioxide
Secondary batteries
Carbonates
Chemical stability
Electrolytes
Crystals
Catalysts
Costs
titanium dioxide

Keywords

  • carbon-free
  • Li-O batteries
  • Magnéli phase
  • RuO
  • TiO

ASJC Scopus subject areas

  • Catalysis

Cite this

Magnéli-Phase Ti4O7 Nanosphere Electrocatalyst Support for Carbon-Free Oxygen Electrodes in Lithium-Oxygen Batteries. / Lee, Seun; Lee, Gwang Hee; Kim, Jae Chan; Kim, Dong-Wan.

In: ACS Catalysis, Vol. 8, No. 3, 02.03.2018, p. 2601-2610.

Research output: Contribution to journalArticle

@article{abdb91931d2f45d6a2464b68edeffaf5,
title = "Magn{\'e}li-Phase Ti4O7 Nanosphere Electrocatalyst Support for Carbon-Free Oxygen Electrodes in Lithium-Oxygen Batteries",
abstract = "Lithium-oxygen batteries have been considerably researched due to their potential for high energy density compared to some rechargeable batteries. However, it is known that the stability of a carbon-based oxygen electrode is insufficient owing to the promotion of carbonate formation, which results in capacity fading and large overpotential in lithium-oxygen batteries. To improve the chemical stability in organic-based electrolytes, alternative electrocatalyst support materials are required. The Ti-O crystal system appears to provide a good compromise between electrochemical performance and cost and is thus an interesting material for further investigation. Here, we investigate a carbon-free electrode with the goal of identifying routes for its successful optimization. To replace carbon materials as an electrocatalyst support, Magn{\'e}li Ti4O7 nanospheres were synthesized from anatase TiO2 nanospheres via a controlled thermochemical reduction. The Magn{\'e}li Ti4O7 nanospheres demonstrated effective overpotential characteristics (1.53 V) compared to the anatase TiO2 nanospheres (1.91 V) during charge-discharge cycling at a current rate of 100 mA g-1. Additionally, RuO2@Magn{\'e}li-Ti4O7 nanospheres were prepared as a bifunctional catalyst-containing oxygen electrode for lithium-oxygen batteries, providing a remarkably reduced overpotential (0.9 V).",
keywords = "carbon-free, Li-O batteries, Magn{\'e}li phase, RuO, TiO",
author = "Seun Lee and Lee, {Gwang Hee} and Kim, {Jae Chan} and Dong-Wan Kim",
year = "2018",
month = "3",
day = "2",
doi = "10.1021/acscatal.7b03741",
language = "English",
volume = "8",
pages = "2601--2610",
journal = "ACS Catalysis",
issn = "2155-5435",
publisher = "American Chemical Society",
number = "3",

}

TY - JOUR

T1 - Magnéli-Phase Ti4O7 Nanosphere Electrocatalyst Support for Carbon-Free Oxygen Electrodes in Lithium-Oxygen Batteries

AU - Lee, Seun

AU - Lee, Gwang Hee

AU - Kim, Jae Chan

AU - Kim, Dong-Wan

PY - 2018/3/2

Y1 - 2018/3/2

N2 - Lithium-oxygen batteries have been considerably researched due to their potential for high energy density compared to some rechargeable batteries. However, it is known that the stability of a carbon-based oxygen electrode is insufficient owing to the promotion of carbonate formation, which results in capacity fading and large overpotential in lithium-oxygen batteries. To improve the chemical stability in organic-based electrolytes, alternative electrocatalyst support materials are required. The Ti-O crystal system appears to provide a good compromise between electrochemical performance and cost and is thus an interesting material for further investigation. Here, we investigate a carbon-free electrode with the goal of identifying routes for its successful optimization. To replace carbon materials as an electrocatalyst support, Magnéli Ti4O7 nanospheres were synthesized from anatase TiO2 nanospheres via a controlled thermochemical reduction. The Magnéli Ti4O7 nanospheres demonstrated effective overpotential characteristics (1.53 V) compared to the anatase TiO2 nanospheres (1.91 V) during charge-discharge cycling at a current rate of 100 mA g-1. Additionally, RuO2@Magnéli-Ti4O7 nanospheres were prepared as a bifunctional catalyst-containing oxygen electrode for lithium-oxygen batteries, providing a remarkably reduced overpotential (0.9 V).

AB - Lithium-oxygen batteries have been considerably researched due to their potential for high energy density compared to some rechargeable batteries. However, it is known that the stability of a carbon-based oxygen electrode is insufficient owing to the promotion of carbonate formation, which results in capacity fading and large overpotential in lithium-oxygen batteries. To improve the chemical stability in organic-based electrolytes, alternative electrocatalyst support materials are required. The Ti-O crystal system appears to provide a good compromise between electrochemical performance and cost and is thus an interesting material for further investigation. Here, we investigate a carbon-free electrode with the goal of identifying routes for its successful optimization. To replace carbon materials as an electrocatalyst support, Magnéli Ti4O7 nanospheres were synthesized from anatase TiO2 nanospheres via a controlled thermochemical reduction. The Magnéli Ti4O7 nanospheres demonstrated effective overpotential characteristics (1.53 V) compared to the anatase TiO2 nanospheres (1.91 V) during charge-discharge cycling at a current rate of 100 mA g-1. Additionally, RuO2@Magnéli-Ti4O7 nanospheres were prepared as a bifunctional catalyst-containing oxygen electrode for lithium-oxygen batteries, providing a remarkably reduced overpotential (0.9 V).

KW - carbon-free

KW - Li-O batteries

KW - Magnéli phase

KW - RuO

KW - TiO

UR - http://www.scopus.com/inward/record.url?scp=85042879155&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85042879155&partnerID=8YFLogxK

U2 - 10.1021/acscatal.7b03741

DO - 10.1021/acscatal.7b03741

M3 - Article

AN - SCOPUS:85042879155

VL - 8

SP - 2601

EP - 2610

JO - ACS Catalysis

JF - ACS Catalysis

SN - 2155-5435

IS - 3

ER -