Highly efficient hierarchical multiroom-structured molybdenum carbide/carbon composite microspheres grafted with nickel-nanoparticle-embedded nitrogen-doped carbon nanotubes as air electrode for lithium-oxygen batteries

Yeon Jong Oh, Jung Hyun Kim, Seung Keun Park, Jin Sung Park, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Designing an efficient and effective air electrode catalyst material is the most intrinsic requisite for rechargeable lithium-oxygen (Li-O2) batteries showing long cycling lives and high rate capacities. Here, we present for the first time, hierarchical multiroom-structured molybdenum carbide/carbon composite microspheres grafted with Ni nanoparticle-embedded N-doped carbon nanotubes (NCNTs) (i.e., mNi-NCNT-MoC-C), which are prepared by pilot-scale spray drying and subsequent surface growth of NCNT bundles. The designed mNi-NCNT-MoC-C microspheres show efficient bifunctional catalytic activities toward both oxygen reduction and evolution. In addition, the hierarchical multiroom structure of mNi-NCNT-MoC-C microspheres increases the discharge capacity by providing sufficient space to accommodate Li2O2, which forms during discharging. A Li-O2 battery prepared using mNi-NCNT-MoC-C microspheres as an air electrode exhibits excellent electrochemical performances including a long cycle life (199 cycles) and low overpotentials of 0.20 and 0.21 V for charging and discharging, respectively. The synergetic effects of efficient morphology (i.e., the multiroom structure), highly electrocatalytically active materials (i.e., NCNT, Ni, and MoC), and high electrical conductivity (imparted by the NCNTs) is responsible for the superior performance of mNi-NCNT-MoC-C microspheres as an air cathode material for Li-O2 batteries.

Original languageEnglish
Pages (from-to)886-896
Number of pages11
JournalChemical Engineering Journal
Volume351
DOIs
Publication statusPublished - 2018 Nov 1

Fingerprint

Carbon Nanotubes
molybdenum
lithium
Nickel
Microspheres
Lithium
Molybdenum
Carbides
Carbon nanotubes
nickel
electrode
Nitrogen
Carbon
Oxygen
Nanoparticles
oxygen
Electrodes
nitrogen
carbon
Composite materials

Keywords

  • Hierarchical structure
  • Lithium-O batteries
  • Molybdenum carbide
  • N-doped carbon nanotubes
  • Spray drying

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

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title = "Highly efficient hierarchical multiroom-structured molybdenum carbide/carbon composite microspheres grafted with nickel-nanoparticle-embedded nitrogen-doped carbon nanotubes as air electrode for lithium-oxygen batteries",
abstract = "Designing an efficient and effective air electrode catalyst material is the most intrinsic requisite for rechargeable lithium-oxygen (Li-O2) batteries showing long cycling lives and high rate capacities. Here, we present for the first time, hierarchical multiroom-structured molybdenum carbide/carbon composite microspheres grafted with Ni nanoparticle-embedded N-doped carbon nanotubes (NCNTs) (i.e., mNi-NCNT-MoC-C), which are prepared by pilot-scale spray drying and subsequent surface growth of NCNT bundles. The designed mNi-NCNT-MoC-C microspheres show efficient bifunctional catalytic activities toward both oxygen reduction and evolution. In addition, the hierarchical multiroom structure of mNi-NCNT-MoC-C microspheres increases the discharge capacity by providing sufficient space to accommodate Li2O2, which forms during discharging. A Li-O2 battery prepared using mNi-NCNT-MoC-C microspheres as an air electrode exhibits excellent electrochemical performances including a long cycle life (199 cycles) and low overpotentials of 0.20 and 0.21 V for charging and discharging, respectively. The synergetic effects of efficient morphology (i.e., the multiroom structure), highly electrocatalytically active materials (i.e., NCNT, Ni, and MoC), and high electrical conductivity (imparted by the NCNTs) is responsible for the superior performance of mNi-NCNT-MoC-C microspheres as an air cathode material for Li-O2 batteries.",
keywords = "Hierarchical structure, Lithium-O batteries, Molybdenum carbide, N-doped carbon nanotubes, Spray drying",
author = "Oh, {Yeon Jong} and Kim, {Jung Hyun} and Park, {Seung Keun} and Park, {Jin Sung} and Lee, {Jung Kul} and Kang, {Yun Chan}",
year = "2018",
month = "11",
day = "1",
doi = "10.1016/j.cej.2018.06.166",
language = "English",
volume = "351",
pages = "886--896",
journal = "Chemical Engineering Journal",
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T1 - Highly efficient hierarchical multiroom-structured molybdenum carbide/carbon composite microspheres grafted with nickel-nanoparticle-embedded nitrogen-doped carbon nanotubes as air electrode for lithium-oxygen batteries

AU - Oh, Yeon Jong

AU - Kim, Jung Hyun

AU - Park, Seung Keun

AU - Park, Jin Sung

AU - Lee, Jung Kul

AU - Kang, Yun Chan

PY - 2018/11/1

Y1 - 2018/11/1

N2 - Designing an efficient and effective air electrode catalyst material is the most intrinsic requisite for rechargeable lithium-oxygen (Li-O2) batteries showing long cycling lives and high rate capacities. Here, we present for the first time, hierarchical multiroom-structured molybdenum carbide/carbon composite microspheres grafted with Ni nanoparticle-embedded N-doped carbon nanotubes (NCNTs) (i.e., mNi-NCNT-MoC-C), which are prepared by pilot-scale spray drying and subsequent surface growth of NCNT bundles. The designed mNi-NCNT-MoC-C microspheres show efficient bifunctional catalytic activities toward both oxygen reduction and evolution. In addition, the hierarchical multiroom structure of mNi-NCNT-MoC-C microspheres increases the discharge capacity by providing sufficient space to accommodate Li2O2, which forms during discharging. A Li-O2 battery prepared using mNi-NCNT-MoC-C microspheres as an air electrode exhibits excellent electrochemical performances including a long cycle life (199 cycles) and low overpotentials of 0.20 and 0.21 V for charging and discharging, respectively. The synergetic effects of efficient morphology (i.e., the multiroom structure), highly electrocatalytically active materials (i.e., NCNT, Ni, and MoC), and high electrical conductivity (imparted by the NCNTs) is responsible for the superior performance of mNi-NCNT-MoC-C microspheres as an air cathode material for Li-O2 batteries.

AB - Designing an efficient and effective air electrode catalyst material is the most intrinsic requisite for rechargeable lithium-oxygen (Li-O2) batteries showing long cycling lives and high rate capacities. Here, we present for the first time, hierarchical multiroom-structured molybdenum carbide/carbon composite microspheres grafted with Ni nanoparticle-embedded N-doped carbon nanotubes (NCNTs) (i.e., mNi-NCNT-MoC-C), which are prepared by pilot-scale spray drying and subsequent surface growth of NCNT bundles. The designed mNi-NCNT-MoC-C microspheres show efficient bifunctional catalytic activities toward both oxygen reduction and evolution. In addition, the hierarchical multiroom structure of mNi-NCNT-MoC-C microspheres increases the discharge capacity by providing sufficient space to accommodate Li2O2, which forms during discharging. A Li-O2 battery prepared using mNi-NCNT-MoC-C microspheres as an air electrode exhibits excellent electrochemical performances including a long cycle life (199 cycles) and low overpotentials of 0.20 and 0.21 V for charging and discharging, respectively. The synergetic effects of efficient morphology (i.e., the multiroom structure), highly electrocatalytically active materials (i.e., NCNT, Ni, and MoC), and high electrical conductivity (imparted by the NCNTs) is responsible for the superior performance of mNi-NCNT-MoC-C microspheres as an air cathode material for Li-O2 batteries.

KW - Hierarchical structure

KW - Lithium-O batteries

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KW - N-doped carbon nanotubes

KW - Spray drying

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