TY - JOUR
T1 - Constructing hierarchical MoO2/N-doped carbon hydrangea-like spheres with superior lithium storage properties
AU - Sun, Huanhuan
AU - Zhang, Yu
AU - Liu, Huanyan
AU - Zhang, Xingyuan
AU - Wang, Jian Gan
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/5/30
Y1 - 2019/5/30
N2 - The increasing demand for renewable energy boosts the exploration of energy conversion and storage devices, which to a large extent depends on the development of reliable electrode materials. In this work, hierarchically-structured MoO2/N-doped carbon hydrangea-like spheres (designated as MoO2/N-C thereafter) self-assembled from mesoporous nanosheets are successfully prepared via a facile hydrothermal reaction and a subsequent annealing process. Benefiting from the hierarchically mesoporous architecture, nanosheet configuration, and electrically conductive carbon matrix, the hydrangea-like MoO2/N-C spheres possess favorable electrochemical features including sufficient electrode/electrolyte interfacial areas, shortened ion diffusion length, and promoted reaction kinetics. Accordingly, the MoO2/N-C hybrid shows excellent electrochemical performance, delivering a large specific capacity of 899 mAh g−1 with an initial Coloumbic efficiency as high as 82.9% as well as long-term cycling performance. In addition, outstanding rate capability can be achieved with a high capacity retention of 400 mAh g−1 at 2000 mA g−1, which substantially outperforms that of the commercial MoO2 nanoparticles. The present study suggests the great potential of MoO2/N-C spheres as high-performance electrode materials for advanced energy storage applications.
AB - The increasing demand for renewable energy boosts the exploration of energy conversion and storage devices, which to a large extent depends on the development of reliable electrode materials. In this work, hierarchically-structured MoO2/N-doped carbon hydrangea-like spheres (designated as MoO2/N-C thereafter) self-assembled from mesoporous nanosheets are successfully prepared via a facile hydrothermal reaction and a subsequent annealing process. Benefiting from the hierarchically mesoporous architecture, nanosheet configuration, and electrically conductive carbon matrix, the hydrangea-like MoO2/N-C spheres possess favorable electrochemical features including sufficient electrode/electrolyte interfacial areas, shortened ion diffusion length, and promoted reaction kinetics. Accordingly, the MoO2/N-C hybrid shows excellent electrochemical performance, delivering a large specific capacity of 899 mAh g−1 with an initial Coloumbic efficiency as high as 82.9% as well as long-term cycling performance. In addition, outstanding rate capability can be achieved with a high capacity retention of 400 mAh g−1 at 2000 mA g−1, which substantially outperforms that of the commercial MoO2 nanoparticles. The present study suggests the great potential of MoO2/N-C spheres as high-performance electrode materials for advanced energy storage applications.
KW - Li-ion batteries
KW - Mesoporous structure
KW - Molybdenum dioxide
KW - Nanosheet
KW - Nitrogen-doped carbon
UR - http://www.scopus.com/inward/record.url?scp=85061341936&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2019.02.007
DO - 10.1016/j.jallcom.2019.02.007
M3 - 文章
AN - SCOPUS:85061341936
SN - 0925-8388
VL - 787
SP - 45
EP - 52
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -