1.The TEM analysis on the atomic structure of heterogeneous catalysts, e.g. structure anisotropy, atom-stacking defects, strains at interface as well as the EELS study on the configuration-related electronic status around active sites, so as to establish quantitative structure-function relationship. 

2. Design of highly uniform model catalyst base on nanocrystals for the precise characterization of structure evolution during catalytic reactions by using the in situ TEM observations. The real time atomic structure reconstruction including the surface coordination, elemental distribution and migration.

3. The big data analysis of in situ TEM, developing the systematic solution to dealing with data volume at hundreds of GB or even TB scale, for the data distribution, batch processing, microscopy information distinguish and etraction.

4.The development of relevant equipment for electron microscopes, focusing on the needs of energy and environmental electron microscopy, center on the in-situ electron microscopy technology, the development of new electron microscope components, special sample stage and other key components, strengthening innovation in electron diffraction, atmosphere control, performance measurement, etc. Developing new microscopic research methods for catalytic materials.

1.2007.09-2012.06       

As PhD candidate in Beihang University majored in condensed matter physics and focusing on  Nanomaterial and Microstructure based on transmission electron microscopy. During this period, as exchanging scholar to Trinity College Dublin (Ireland) and University of Michigan (USA) for 9 months working on focal series reconstruction TEM imaging and in situ HAADF imaging.

2. 2003.09-2007.07    

Study for Bachelor Degree in department of physics in Beihang University majored in Applied Physics

1.2017.04-now

As an Associate Professor in Advanced Electron Microscopy Center of National Lab for clean energy, Dalian Institute of Chemical Physics, engaged in ennergetic storage and catalysis with techniques of atom-resolved TEM/STEM imaging, in situ electron microscopy methodology as well as combined devolopment and innovation of new devices and instruments around electron microscope. 

2.  2013.11-2017.03

As an Associate Professor in school of physical electronics University of Electronic Science and Technology of China. Research interests focus on growth and microscopy analysis of heterogenous nanostructures, irradiation sensitive metastable materials for energetic and catalytic applications. (2015.07-2016.08 Visiting Scholar, University of Michigan, conduting researches on atomic structure of nanocatalyst based on electron microscope)

3.  2012.06-2013.10 

As a Lecturer in department of physics Sichuan University. Research work involves TEM characterizaiton of functional oxides, semiconductors for photoelectric applications, sensors. 

Two years teaching exprience for Colleage Courses for undergraduate students, including Colleage Physics, Therotical Physics,  and Thermal Dynamics and Stastical Physics.

[1]    Liu, S. H.,^# Xu, H.,^# Liu, D. D., Yu, H., Zhang, F., Zhang, P., Zhang, R. L., Liu, W.* Identify the Activity Origin of Pt Single-Atom Catalyst via Atom-by-Atom Counting. Journal of the American Chemical Society, 143, 15243-15249 (2021).

[2]    Liu, S., Xu, C., Zhang, Z., Zhao, Q., Yao, L., Liu, W.* Precisely identify the geometry of catalyst particles from S/TEM images via a boundary attention deep learning network. Material Today Communications 28 102728 (2021).

[3]    Zhang, X.^#, Han, S.^#, Zhu, B. ^#, Zhang, G. ^#, Li, X., Gao, Y.*, Wu, Z., Yang, B.*, Liu, Y., Baaziz, W., Ersen, O., Gu, M.*, Miller, J. T.& Liu, W.* Reversible loss of core–shell structure for Ni–Au bimetallic nanoparticles during CO₂ hydrogenation. Nature Catalysis 3, 411-417 (2020).

[4]    Piao, Y.,^# Jiang, Q.,^# Li, H., Matsumoto, H., Liang, J., Liu, W.,* Pham-Huu, C., Liu, Y.,* Wang, F.,* ACS Catalysis 10, 7894-7906 (2020) (Cover artwork)

[5]   Liu, W.^#, Wang, N. ^#, Wang, R. M.*, Kumar, S., Duesberg, S. G., Zhang, H. Z.*& Sun, K. Atom-Resolved Evidence of Anisotropic Growth in ZnS Nanotetrapods. Nano Letters 11, 2983-2989 (2011).

1.一种用于硼烷氨制氢的NiAu纳米催化剂的制备方法, 发明, 2016, 第 1 作者, 专利号: 201610934855.0

2.苏党生，张晓奔，吴兆萱，杨冰，刘伟。Ni@Au 核壳型纳米催化剂及其合成与应用，中国发明专利，申请号：201810840687.8

3.刘淑慧，刘伟。一种基于原子分辨电镜的负载金属催化剂分散度测算方法，中国发明专利，申请号：20191144608.0

Electron microscopy has served as unique methodology in directly observing materials at nano- or even atomic scale. Particularly, a modern transmission electron microscope has evolved into a delicate integration platform facilitating materials researches from structural characterization to final property measurement. Deeply rooted in nanotechnology, demands from catalysis study have been driving the emergence of diverse cutting edge technologies of electron microscopy, e.g. aberration correction TEM, environmental TEM of gas and liquid phases. Practical EM techniques of TEM and STEM, especially on those adapted for catalysis researches are in scope of what we are interested in, for example, STEM imaging of metal-oxide hybrid structrues, expecially for those light metal atoms supported by heavy oxides that chanllenges the projection imaging system, localized electronic structure diversity around catalytically active metal and the interface between metal and oxide supports, dynamic tracing the evolution of surface active phase when a reaction takes place, together with the effcient data analysis of Big data yielded from in situ TEM techniques, design and fabrication of new functional device or instument around the electron microscope et al., whole content of which could be denoted as the in situ methodology.

Focusing on catalysis research based on advance electron microscopy techniques, close collaborations are established with top-level experts distinguished in aspects of X-ray absorbtion specstroscopy, in situ electron microsocpy, therotical simulation of surface chemical reactions, nanostructure fabrication and electrochemistry et al. including Prof. Jeff T. Miller from Purdue University, Prof. Guanghui Zhang from Dalian University of Technology, Prof. Yi Gao from Shanghai Institute of Applied Physics, Prof. Bin Liu from Nayyang Technological University. 

已指导学生

张殿宇  硕士研究生  085204-材料工程  

现指导学生

谈子健  硕士研究生  085600-材料与化工  

Awards for 2013 excellent doctoral dissertation of Beihang University, 2018 urgently needed talents of Dalian, 2018 urgently needed talents of Dalian, 2019 CAS Youth Innovation Promotion Association