Xiaowei Yang

Shanghai Jiao Tong University


TITLE

Tuning two-dimensional channel for ion sieving


Short Biography

Prof Xiaowei Yang completed her Ph.D. studies at the Shanghai Jiao Tong University under the supervision of Prof. Zi-Feng Ma and Prof. Dan Li (Monash University). His doctoral research focused on graphene based supercapacitors. Thereafter, he obtained a Postdoctoral Research Fellow to work in the groups of Prof. Dan Li in Australia. In December 2014, he obtained an acdemic position as the group leader at the Tongji University in China. In June 2020, he was appointed full professor at the Shanghai Jiao Tong University. Her research interests include the 2D ion transpor and divalent-ion battery.

Abstract

Ion transport under confined conditions is an important process for electrochemical energy conversion or storage, but is still poorly understood. Under the influence of short-range interfacial forces, there are many anomalies in confined ion transport, such as Coulomb blocking. We previously reported that different interface elements and crystal face orientation can play a decisive role in the adsorption characteristics of water decomposition products, thus affecting the reaction selectivity. With the increase of the valence state of ions, the hydration energy of ions increases gradually, and the hydrated ions are mainly free ions, and become large clusters containing cations and ions, resulting in a large limited diffusion energy barrier. We construct different electronegativity models and find that their competitive coordination mechanisms can increase or decrease the diffusion energy barrier.

In addition to the kinetic properties, the increase in the valence state of ions has an impact on the thermodynamics of solvents. Organic solvents with bivalent magnesium ion coordination are more likely to be reduced than cations, resulting in poor circulation of magnesium ion battery systems. We have improved the stability of the interface by preferentially coordinating the ions or the interface. The channel is also constructed to realize the high selectivity of ion transport and improve the reversibility of the battery

  • Wang, S.P.; Zhao, X.L.; Yan, X.J.; Liu, C.C.; Yang, X.W. Angew. Chem. Int. Ed. 2019, 131, 211;
  • Hu, F.; Zhu S.; Chen S.; Yang X.W.; Xiong Y. Adv. Mater. 2017, 29: 1606570;
  • Li, S.; J. Fu, G. Miao, S. Wang, W. Zhao, Z. Wu, Zhang, Y.; Yang, X. Adv. Mater. 2021, 33, 2008424;
  • Li, J; Shi, Y.; C. Qi, B. Zhang, Yang, X.; et al. Angew. Chem. Int. Ed. 2023, 62, e202309918;
  • Zhao, W.; Pan, Z.; Zhang, Y.; Y. Liu, H. Dou, X. Zhao, Yang, X.; Angew. Chem. Int. Ed. 2022, 61, e202205187;
  • Y Liu, W Zhao, Z Pan, ZQ Fan, M Zhang, X Zhao, X. Yang, Angew. Chem. Int. Ed. 2023, 62, e202302617;
  • Y. Zhang, J. Li, W. Zhao, H. Dou, X. Zhao, Y. Liu, B. Zhang, X. Yang, Adv. Mater. 2022, 34, 2108114.

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