Disputation: Xiao Fan

Xiao Fan at campus Vestfold holds a trial lecture and disputation on April 8.

08 Apr

Practical information

  • Date: 8. April 2021
  • Time: 10.00 - 17.00
  • Location: Vestfold
  • Follow on Zoom (click on the link that becomes active when the program starts).


    10.30: Trial lecture«Gas microsensors: principles, applications and recent trends».

    12.45: Disputation «Preparation of novel metal oxides/hydroxides materials and their applications in supercapacitors».

    Evaluation committee

    • First opponent: PhD/CTO Wei Sun, GMCC Electronic Technology Wuxi, Ltd.
    • Second opponent: PhD Adriana Cozma, Sensocure AS.
    • Administrator: Professor Nils Deneke Høivik, USN.


    • Principal supervisor: professor Xuyuan Chen, USN.
    • Co-supervisors: Professor emeritus Per Alfred Øhlckers and professor Einar Halvorsen, USN.




Portrett av Xiao FanXiao Fan, candidate in the PhD programme Applied Micro- and Nano Systems at Faculty of Technology, Natural Sciences and Maritime Sciences, will be defending his thesis for the degree of philosophiae doctor (PhD).

Title of thesis: «Preparation of novel metal oxides/hydroxides materials and their applications in supercapacitors».

Trial lecture topic: «Gas microsensors: principles, applications and recent trends».

The trial lecture an the PhD defense will be held on Zoom on April 8 from 10.00 AM.


Rapid technological development and accelerated natural resource consumption have largely increased the demand for efficient, environmentally-friendly, cost-effective, and safe energy storage devices. Because of unparalleled advantages such as superior power density, strong temperature adaptation, fast charge/discharge rate and ultralong service life, supercapacitors have significantly covered the shortage of conventional physical capacitors and batteries. Pseudocapacitors (PsCs) contribute to higher specific capacitance by reversible faradaic redox reactions and have become the research hotspot in supercapacitors research fields in past decade.

The performances and properties of PsCs are significantly determined by the electrode materials. It was found that Co3O4 and Ni-Co binary hydroxide are two of the promising electrode materials utilized in PsCs. The candidate thus proposed two strategies to optimize the aforementioned materials in order to satisfy the ever-growing demand. As the first strategy, the effort focused on synthesizing materials with desirable morphologies.

Fabrication of Co3O4 with porous hollow spheres/nanoboxes has been explored, as well as fabrication of Ni-Co binary hydroxide with nanosheets encapsulated with nanowires has been investigated. As the second strategy, the candidate developed the technology for loading material in a way to realize the binder-free electrode which reduced the electron transfer impedance.