About Us

Keiko WAKI

Department Department of Energy Sciences
Job title Associate Professor
Degree Doctor of Engineering
Room# / Phone Suzukakedai Campus G3-410 / Tel/Fax: +81-45-924-5614
E-mail waki.k.aam.titech.ac.jp
Web page http://www2.es.titech.ac.jp/waki/en/index.html
Keywords Clean renewable energy, fuel cells, lithium ion batteries, dye-sensitized solar cells, applications of carbon nanotubes
Research
Achievement
http://www2.es.titech.ac.jp/waki/en/index.html

Research Highlights

With the depletion of non-renewable resources and global warming, renewable clean energy has become paramount towards sustainable living on earth. Among these clean energy conversion and storage systems, our laboratory primarily focuses on fuel cells, lithium ion batteries and dye-sensitized solar cells.

Fuel cells& Li ion battery:
Structurally controlled carbon nanotubes (MWCNTs) are investigated as the cathode and anode for fuel cells and Li ion batteries application, respectively. To realize the new structure of DMWCNT with nano-holes deffects, an original method to make crystal defects on the surface of multi-walled carbon nanotubes using nano-oxide particles as the catalysts for breaking the carbon surface in air at low temperature was developed in our lab..
The oxygen reduction reaction (ORR) characteristics which are important for the fuel cell application are studied to clarify the roles of the defects and functional groups. On the other hand, the lithium storage capacities for different DMWCNT structure for lithium ion batteries. So far, we have achieved the highest on-set potential of ORR for the non-doped carbons reported, and also a highest Li ion storage capacity among MWCNT electeodes.

Dye-sensitized solar cells (DSSCs)
 In order to achieve further improvements in electron transport and overall efficiency, many studies have focused on DSSC photoanodes containing one-dimensional nanostructures such as nanotubes, nanofibers, and nanorods. Among these materials, ZnO nanorod array electrodes have attracted significant attention due to their favorable properties such as electron mobility and ease of fabrication. In our lab, we modify the ZnO nanorod array by addition of the second metal to change both the morphology and electronic properties of the ZnO electrode.