Abstract
Rational design of efficient, affordable, and durable electrocatalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is essential for rechargeable lithium-oxygen (Li–O2) batteries. We present for the first time hierarchical hollow microspheres grafted with metallic Co-embedded bamboo-like N-doped carbon nanotube bundles (Co-b-NCNTs hollow microspheres) as oxygen electrodes for Li-air batteries. Hierarchical composite microspheres are prepared via a facile two-step process involving synthesis of Co3O4-MgO hollow microspheres by spray pyrolysis, followed by internal and external growth of bamboo-like NCNTs in the shells. During post-treatment, metallic Co and MgO nanoparticles play key respective roles in catalyzing in-situ growth of NCNTs and maintaining structural integrity of the composites. The hierarchical composite structure with Co and N doping not only provides ample active sites for the OER and ORR, but also sufficient space for storing produced Li2O2. Thus, Co-b-NCNTs hollow microspheres exhibit high initial round-trip efficiency, long-term cycling and ultrahigh rate performances when applied as oxygen electrodes for Li–O2 batteries. The initial discharge capacity and round-trip efficiency at a current density of 200 mA g−1 are 28,968 mA h g−1 and 78.2%, respectively. Specific capacities at cutoff capacities of 500 and 1000 mA h g−1 are stable for 201 and 157 cycles, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 2500-2510 |
| Number of pages | 11 |
| Journal | Chemical Engineering Journal |
| Volume | 334 |
| DOIs | |
| Publication status | Published - 2018 Feb 15 |
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Keywords
- Carbon nanotubes
- Cathode material
- Hierarchical structure
- Li-O batteries
- Nanostructured material
- Spray pyrolysis
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering
Cite this
Hierarchical hollow microspheres grafted with Co nanoparticle-embedded bamboo-like N-doped carbon nanotube bundles as ultrahigh rate and long-life cathodes for rechargeable lithium-oxygen batteries. / Kim, Jung Hyun; Park, Seung Keun; Oh, Yeon Jong; Kang, Yun Chan.
In: Chemical Engineering Journal, Vol. 334, 15.02.2018, p. 2500-2510.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hierarchical hollow microspheres grafted with Co nanoparticle-embedded bamboo-like N-doped carbon nanotube bundles as ultrahigh rate and long-life cathodes for rechargeable lithium-oxygen batteries
AU - Kim, Jung Hyun
AU - Park, Seung Keun
AU - Oh, Yeon Jong
AU - Kang, Yun Chan
PY - 2018/2/15
Y1 - 2018/2/15
N2 - Rational design of efficient, affordable, and durable electrocatalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is essential for rechargeable lithium-oxygen (Li–O2) batteries. We present for the first time hierarchical hollow microspheres grafted with metallic Co-embedded bamboo-like N-doped carbon nanotube bundles (Co-b-NCNTs hollow microspheres) as oxygen electrodes for Li-air batteries. Hierarchical composite microspheres are prepared via a facile two-step process involving synthesis of Co3O4-MgO hollow microspheres by spray pyrolysis, followed by internal and external growth of bamboo-like NCNTs in the shells. During post-treatment, metallic Co and MgO nanoparticles play key respective roles in catalyzing in-situ growth of NCNTs and maintaining structural integrity of the composites. The hierarchical composite structure with Co and N doping not only provides ample active sites for the OER and ORR, but also sufficient space for storing produced Li2O2. Thus, Co-b-NCNTs hollow microspheres exhibit high initial round-trip efficiency, long-term cycling and ultrahigh rate performances when applied as oxygen electrodes for Li–O2 batteries. The initial discharge capacity and round-trip efficiency at a current density of 200 mA g−1 are 28,968 mA h g−1 and 78.2%, respectively. Specific capacities at cutoff capacities of 500 and 1000 mA h g−1 are stable for 201 and 157 cycles, respectively.
AB - Rational design of efficient, affordable, and durable electrocatalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is essential for rechargeable lithium-oxygen (Li–O2) batteries. We present for the first time hierarchical hollow microspheres grafted with metallic Co-embedded bamboo-like N-doped carbon nanotube bundles (Co-b-NCNTs hollow microspheres) as oxygen electrodes for Li-air batteries. Hierarchical composite microspheres are prepared via a facile two-step process involving synthesis of Co3O4-MgO hollow microspheres by spray pyrolysis, followed by internal and external growth of bamboo-like NCNTs in the shells. During post-treatment, metallic Co and MgO nanoparticles play key respective roles in catalyzing in-situ growth of NCNTs and maintaining structural integrity of the composites. The hierarchical composite structure with Co and N doping not only provides ample active sites for the OER and ORR, but also sufficient space for storing produced Li2O2. Thus, Co-b-NCNTs hollow microspheres exhibit high initial round-trip efficiency, long-term cycling and ultrahigh rate performances when applied as oxygen electrodes for Li–O2 batteries. The initial discharge capacity and round-trip efficiency at a current density of 200 mA g−1 are 28,968 mA h g−1 and 78.2%, respectively. Specific capacities at cutoff capacities of 500 and 1000 mA h g−1 are stable for 201 and 157 cycles, respectively.
KW - Carbon nanotubes
KW - Cathode material
KW - Hierarchical structure
KW - Li-O batteries
KW - Nanostructured material
KW - Spray pyrolysis
UR - http://www.scopus.com/inward/record.url?scp=85037358832&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85037358832&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2017.12.018
DO - 10.1016/j.cej.2017.12.018
M3 - Article
AN - SCOPUS:85037358832
VL - 334
SP - 2500
EP - 2510
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -