Visiting student, Drexel University, Supervisor: Prof. Yury Gogotsi (2013)
Drexel University 2016.12-now
Postdoc researcher, Supervisor: Prof. Yury Gogotsi. Research on new 2D metal nitrides and caribides.
Regulation of the electron/ion transport of metal oxide for energy storage
The main issue of metal oxide is the poor electron conductivity and ion diffusion which largely hinder the performance. With understanding deeper of this field, my aim is to fundamentally address the electron/ion transport. The carrier of n-type metal oxide is electron. I thought if I can tune the carrier density, the electron conductivity would be enhanced radically. By use of in-situ doping and hydrogenation, we could control and introduce oxygen vacancies in the oxide and largely improve the electron conductivity. Largely enhanced electrochemical performances were achieved after these regulations. I also systematically study the influence of surface functional group on electron/ion conductivity and tune the ratio of different groups to obtain the highest performance.
Besides, the energy storage mechanism of some oxide (for example, MoO3) is intercalation, ions must be stored in the interlayer of oxide. Considering that the interlayer distance of oxide is not large enough, I developed a method to pre-inserted K+ in the interlayer of MoO3, which increased the distance of interlayer and solve the ion transport issue. Interestingly, such an interlayer-enhanced material could be directly used in large ions electrolyte-even sea water (the first report in literature).
Development of a scalable and general method for two-dimensional metal oxide (even nonlayered structure)
If all of the active atoms could be exposed to the electrolyte, the ion transport issue could be thoroughly solved. In this way, I developed a scalable and general method to obtain high quality and large size (100 μm) 2D oxide even with nonlayered structure (such as h-MoO3, h-WO3, MoO2 and MnO), which solves the disadvantages of both vacuum (CVD, high quality but low amount) and solution (large amount but sometimes low quality and need surfactant) method. Using 2D h-MoO3 as the example, we could achieve the theoretical capacitance (996 C/g) at a high sweep rate which means very fast ions transport speed. Interestingly, we found that 2D h-MoO3 showed a unique property in Al-electrolyte with the largest volumetric capacitance (300 F/cm3) compared to literature, indicating the potential in Al-ions battery.
Development of self-powered systems
I have developed a high mass-loading freestanding electrode and fabricated the flexible solid-state SCs. Combined with solar cells and triboelectric generators, we could collect the micro energy from environment and store into flexible solid-state SCs to drive electronic devices, resulting in a self-powered system.
Research on nanosensors
Fabrication of a semi-transparent high-strain sensor based on ZnO/polymer hybrid film, which can measure and withstand strain up to 50%.
Outstanding graduate of Huazhong University of Science and Technology 2016
National Scholarship 2014
“Top Ten Graduate in Science” of Huazhong University of Science and Technology 2013
“Best Student Paper Award” of The 6th International Photonics and OptoElectronics Meetings 2013
National Scholarship 2012
“Three Goods” graduate of Huazhong University of Science and Technology 2012
Cited times: 2404, h-index 17. Google scholar: https://scholar.google.com.hk/citations?user=neE3h2QAAAAJ&hl=en
1. Xiao, X.; Yu, H.; Jin, H.; Wu, M.; Fang, Y.; Sun, J.; Hu, Z.; Li, T.; Wu, J.; Huang, L.; Gogotsi, Y.; Zhou, J. Salt-templated Synthesis of 2D Metallic MoN and Other Nitrides, ACS Nano, 2017, DOI: 10.1021/acsnano.6b08534.
2. Xiao, X.; Song, H.; Lin, S.; Zhou, Y.; Zhan, X.; Hu, Z.; Zhang, Q.; Sun, J.; Yang, B.; Li, T.; Jiao, L.; Zhou, J.; Tang, J.; Gogotsi, Y. Scalable Salt-Templated Synthesis of 2D Transition Metal Oxides. Nat. Commun., 2016, 7, 11296. (Reports and mentions by 23 news articles, such as Materials Today, Nanowerk, Science Daily, Yahoo…)
21. Huang, L.; Gao, X.; Dong, Q.; Hu, Z. M.; Xiao, X.; Li, T. Q.; Cheng, Y. L.; Yao, B.; Wan, J.; Ding, D.; Ling, Z.; Qiu, J. S.; Zhou, J., HxMoO3-y nanobelts with sea water as electrolyte for high-performance pseudocapacitors and desalination devices. J. Mater. Chem. A2015,3, 17217-17223.