Title: Nanowire Devices for Electrochemical Energy Storage
Presenter: Professor Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology, Wuhan,
Date: Monday 18 July 2016
Venue: LKM Theatre AIIM Facility, Innovation Campus Level 1
One-dimensional nanomaterials can offer large surface area, facile strain relaxation upon cycling and efficient electron transport pathway to achieve high electrochemical performance. Hence, nanowires have attracted increasing interest in energy related fields containing flexible and stretchable devices.1-2
We designed the single nanowire electrochemical device for in situ probing the direct relationship between electrical transport, structure, and electrochemical properties of the single nanowire electrode to understand intrinsic reason of capacity fading. The results show that during the electrochemical reaction, conductivity of the nanowire electrode decreased, which limits the cycle life of the devices.3 Then, the prelithiation and Langmuir-Blodgett technique have been used to improve cycling properties of nanowire electrode. Recently, we have fabricated hierarchical MnMoO4/CoMoO4 heterostructured nanowires by combining "oriented attachment" and "self-assembly".4 We also developed the general synthesis of complex nanotubes by gradient electrospinning, including Li3V2(PO4)3, Na0.7Fe0.7Mn0.3O2 and Co3O4 mesoporous nanotubes, which exhibit ultrastable electrochemical performance when used in lithium-ion batteries, sodium-ion batteries and supercapacitors, respectively.5 We also established spiral-shaped three-dimensional micropseudocapacitors with the area of ?1.67 mm2 and height of 1.7 ?m, which deliver both ultrahigh energy density of 34.9 mWh cm-3 at the scan rate of 10 mV s-1 and high power density of 193.4 W cm-3 at the ultrahigh scan rate of 200 V s-1.6 Our work presented here can inspire new thought in constructing novel one-dimensional structures and accelerate the development of energy storage applications including flexible and stretchable devices.
Reference  Y. L. Zhao, L. Q. Mai et al., Nat. Commun. 2014, 5, 4565;  Q. Qing, L. Q. Mai et al., Nat. Nanotechnol. 2014, 9, 142;  L. Q. Mai, Y. J. Dong et al., Nano Lett. 2010, 10, 4273;  L. Q. Mai, F. Yong et al., Nat. Commun. 2011, 2, 381;  C. J. Niu, L. Q. Mai et al., Nat. Commun. 2015, 6, 7402;  X. C. Tian, L. Q. Mai et al., Adv. Mater. 2015, 27, 7476;
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