Na2Ti7O15 Nanowires with an Oriented Tunnel Structure and High Mechanical Stability: A Potential Anode of Sodium-Ion Batteries and Gas Sensing Materials

Na2Ti7O15 (NTO) can be selected as candidate anode for high-performance sodium-ion batteries (SIBs). However, there are few reports of research on the mechanical properties of low-dimensional NTO, which is important for the stability of SIBs. In this work, by using the one-step hydrothermal method, NTO nanowires (NWs) with good orientation were prepared successfully. The transmission electron microscopy (TEM) and selected area electron diffraction (SAED)showed that the NTO NWs had a good aspect ratio and dispersion, with lengths over 20 μm. Further microstructure analysis showed that the nanowires grew along the (020) direction, and there were some “stripe” structures along the growing direction, which provides a good tunnel structure for Na ion channels. Further, the in situ mechanical analysis showed that the NTO NWs had excellent elastic deformation characteristics and mechanical structural stability. In addition, the NTO NWs also showed a good gas sensitivity to NO and NH3. Our results showed that the prepared NTO nanowires with a stripe tunnel oriented-structure and excellent mechanical properties may have a potential application in SIBs or other wearable sensor devices.

[1]  T. Hotokebuchi,et al.  Plate, wire, mesh, microsphere, and microtube composed of sodium titanate nanotubes on a titanium metal template. , 2007, Langmuir : the ACS journal of surfaces and colloids.

[2]  Y. Bando,et al.  Pseudo-One-Dimensional Periodic Domain Boundary Structures in Alkali Titanium Oxides , 2001 .

[3]  Masakazu Kawashita,et al.  Novel bioactive materials with different mechanical properties. , 2003, Biomaterials.

[4]  W. Ni,et al.  Molybdenum and tungsten chalcogenides for lithium/sodium-ion batteries: Beyond MoS2 , 2019, Journal of Energy Chemistry.

[5]  Zhen-guo Wu,et al.  Design and Synthesis of Layered Na2Ti3O7 and Tunnel Na2Ti6O13 Hybrid Structures with Enhanced Electrochemical Behavior for Sodium‐Ion Batteries , 2018, Advanced science.

[6]  G. Meng,et al.  Preparation and photocatalytic activity of alkali titanate nano materials A2TinO2n+1 (A=Li, Na and K) , 2007 .

[7]  Wenkai Chen,et al.  First-principles study of Na2+xTi7O15 as anode materials for sodium-ion batteries , 2016 .

[8]  S. Vigneswaran,et al.  Adsorptive removal of heavy metals from water using sodium titanate nanofibres loaded onto GAC in fixed-bed columns. , 2015, Journal of hazardous materials.

[9]  Mingwen Zhao,et al.  Prediction of a flexible anode material for Li/Na ion batteries: Phosphorous carbide monolayer (α-PC) , 2019, Carbon.

[10]  J. Choi,et al.  Highly elastic binders integrating polyrotaxanes for silicon microparticle anodes in lithium ion batteries , 2017, Science.

[11]  Xin Liu,et al.  In situ synthesis of Na2Ti7O15 nanotubes on a Ti net substrate as a high performance anode for Na-ion batteries. , 2015, Chemical communications.

[12]  Huaiyong Zhu,et al.  Electrochemical lithium storage of sodium titanate nanotubes and nanorods , 2008 .

[13]  Q. Peng,et al.  Heterogeneous Ti3SiC2@C-Containing Na2Ti7O15 Architecture for High-Performance Sodium Storage at Elevated Temperatures. , 2017, ACS nano.

[14]  Sungho Jin,et al.  Growth of nano-scale hydroxyapatite using chemically treated titanium oxide nanotubes. , 2005, Biomaterials.

[15]  Jin Wang,et al.  Effect of different oxide thickness on the bending Young’s modulus of SiO2@SiC nanowires , 2016, Scientific Reports.

[16]  E. Djurado,et al.  Synthesis of sodium titanate composites by sol-gel method for use in gas potentiometric sensors , 2004 .

[17]  H. Teng,et al.  Nanotube formation from a sodium titanate powder via low-temperature acid treatment. , 2008, Langmuir : the ACS journal of surfaces and colloids.

[18]  Hui Yan,et al.  Structural Modulation of Na0.5Bi0.5TiO3 in Hydrothermal Synthesis , 2016 .

[19]  Jing Ren,et al.  Self-Adaptive Electrode with SWCNT Bundles as Elastic Substrate for High-Rate and Long-Cycle-Life Lithium/Sodium Ion Batteries. , 2018, Small.

[20]  L. Szatmáry,et al.  Sodium titanate nanorods: Preparation, microstructure characterization and photocatalytic activity , 2006 .

[21]  Liangbing Hu,et al.  Determination of mechanical properties of the SEI in sodium ion batteries via colloidal probe microscopy , 2013 .

[22]  E. Zhecheva,et al.  Self-organized sodium titanate/titania nanoforest for the negative electrode of sodium-ion microbatteries , 2015 .