Hierarchical MoO 2 /Mo 2 C/C Hybrid Nanowires for High-Rate and. Long-Life Anodes for Lithium-Ion Batteries. Supporting Information

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1 Supporting Information Hierarchical MoO 2 /Mo 2 C/C Hybrid Nanowires for High-Rate and Long-Life Anodes for Lithium-Ion Batteries Lichun Yang, a Xiang Li, a Yunpeng Ouyang, a Qingsheng Gao, b Liuzhang Ouyang, a Renzong Hu, a Jun Liu, a Min Zhu* a a School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, , P. R. China. memzhu@scut.edu.cn b Department of Chemistry, Jinan University, Guangzhou, , P. R. China. S-1

2 (a) (b) Figure S1. (a) SEM image and (b) N 2 sorption isomers of the MoO 2 NPs purchased from Alfa Aesar. S-2

3 Figure S2. SEM image of the Mo 3 O 10 (C 6 H 5 NH 3 ) 2 2H 2 O nanowires. (a) (b) Figure S3. (a) TEM image and (b) SAED of free carbon obtained after the removal of MoO 2 and Mo 2 C in the MoO 2 /Mo 2 C/C HNWs. S-3

4 Capacity (mah g -1 ) dq/dv (mah g -1 V -1 ) st 100th 200th 300th Potential vs. Li/Li + (V) Figure S4. Differential capacity vs. potential plots for different cycles of the MoO 2 /Mo 2 C/C HNWs at a current density of 200 ma g discharge ( V) charge (0-1.0 V) charge ( V) charge ( V) Cycle number Figure S5. Capacity contribution of the MoO 2 /Mo 2 C/C HNWs in different potential region tested at a current density of 200 ma g -1. S-4

5 Figure S6. TEM image of the MoO 2 /Mo 2 C/C HNWs after 100 cycles of discharge/discharge at a current density of 2000 ma g -1. S-5

6 log (i) Current density (A/g) (a) 3 2 Peak 3 Peak Peak 2 Peak mv/s 0.5 mv/s 0.7mV/s 1mV/s Potential vs. Li/Li + (V) (b) Symbol Peak b-value log (v) Figure S7. (a) CV profiles of the MoO 2 NPs after ten successive CV cycles (scanned at 1 mv s -1 ) and (b) log i vs. log plots for the cathodic and anodic peaks derived from the CV curves shown in panel a. S-6

7 Table S1. Comparison on the electrochemical performance of MoO 2 -based nanomaterials MoO 2 based materials Current density (ma/g) Capacity retention (mah/g) Cycle number References carbon-coated MoO naospheres Hierarchical MoO 2 -graphene nanoarchitecture MoO 2 -graphene Yolk-shell MoO microspheres Mo 2 N nanolayer coated MoO 2 hollow nanostructure MoO 2 /Mo 2 C heteronanotubes MoO 2 /Mo 2 C/C spheres porous MoO 2 /graphene microspheres MoO 2 /N-doped graphene ultrathin MoO 2 nanosheets encapsuled in carbon MoO 2 /Mo 2 C/C HNWs References ~900 ~ ~ This work 1. Wang, Z.; Chen, J. S.; Zhu, T.; Madhavi, S.; Lou, X. W. One-Pot Synthesis of Uniform Carbon-Coated MoO 2 Nanospheres for High-Rate Reversible Lithium Storage. Chem. Commun. 2010, 46, Sun, Y.; Hu, X.; Luo, W.; Huang, Y. Self-Assembled Hierarchical MoO 2 /Graphene Nanoarchitectures and Their Application as a High-Performance Anode Material for Lithium-Ion Batteries. Acs Nano 2011, 5, Bhaskar, A.; Deepa, M.; Rao, T. N.; Varadaraju, U. V. Enhanced Nanoscale Conduction Capability of a MoO 2 /Graphene Composite for High Performance Anodes in Lithium Ion Batteries. J. Power Sources 2012, 216, S-7

8 4. Zhang, X.; Song, X.; Gao, S.; Xu, Y.; Cheng, X.; Zhao, H.; Huo, L. Facile Synthesis of Yolk-Shell MoO 2 Microspheres with Excellent Electrochemical Performance as a Li-Ion Battery Anode. J. Mater. Chem. A 2013, 1, Liu, J.; Tang, S.; Lu, Y.; Cai, G.; Liang, S.; Wang, W.; Chen, X. Synthesis of Mo 2 N Nanolayer Coated MoO 2 Hollow Nanostructures as High-Performance Anode Materials for Lithium-Ion Batteries. Energy Environ. Sci. 2013, 6, Zhang, H.-J.; Wang, K.-X.; Wu, X.-Y.; Jiang, Y.-M.; Zhai, Y.-B.; Wang, C.; Wei, X.; Chen, J.-S. MoO 2 /Mo 2 C Heteronanotubes Function as High-Performance Li-Ion Battery Electrode. Adv. Funct. Mater. 2014, 24, Ihsan, M.; Wang, H.; Majid, S. R.; Yang, J.; Kennedy, S. J.; Guo, Z.; Liu, H. K. MoO 2 /Mo 2 C/C Spheres as Anode Materials for Lithium Ion Batteries. Carbon 2016, 96, Palanisamy, K.; Kim, Y.; Kim, H.; Kim, J. M.; Yoon, W.-S. Self-Assembled Porous MoO 2 /Graphene Microspheres towards High Performance Anodes for Lithium Ion Batteries. J. Power Sources 2015, 275, Wang, X.; Xiao, Y.; Wang, J.; Sun, L.; Cao, M. Facile Fabrication of Molybdenum Dioxide/Nitrogen-Doped Graphene Hybrid as High Performance Anode Material for Lithium Ion Batteries. J. Power Sources 2015, 274, Ni, J.; Zhao, Y.; Li, L.; Mai, L. Ultrathin MoO 2 Nanosheets for Superior Lithium Storage. Nano Energy 2015, 11, S-8