- Post Doctoral
MIT Unit Affiliation:
- Materials Science and Engineering
Post Doc Sponsor / Advisor:
Date PhD Completed:
Top 3 Areas of Expertise:
I received my PhD under the supervision of Professor Takayuki Homma at Waseda University in Tokyo, Japan in 2011. I am now working with Professor Donald R. Sadoway at MIT as a Research Scientist. My experiences include development of an electrochemical fabrication process of bit patterned magnetic recording media for future hard disk drives (published in J. Magn. Magn. Mater., etc.) and liquid metal batteries for grid scale energy storage (published in Nature communications, Nature, etc.), as well as teaching undergraduate, master’s, and PhD students at Waseda University and MIT. My experience covers nano-micro fabrication processes, electrochemical metal deposition processes, metal corrosion (protection and etching process), metal extraction, and battery technology (grid scale energy storage). My experience covers electrochemistry, nano-micro fabrication processes, extractive metallurgy, corrosion science, and battery technology. These furnished me perspectives ranging from materials engineering to basic chemistry. I will design processes and devices based upon my research experiences in large scale materials engineering (e.g., scale of metal extraction) and elucidate/solve the individual issues in these processes and devices based on my research experiences in chemistry (e.g., surface chemistry) from the atomic and molecular scale. I have the advantage of being an expert in the use of aqueous and non-aqueous media at a wide range of scales (atom ~ meter) and temperatures (room temperature ~ high temperature). I will contribution to energy and sustainability research program with the success of developing energy storage devices, electronic devices, materials synthesis processes, coating technology, and metal extraction and recycling processes. I will approach these topics through surface science, electrochemistry, and multi-scale (atom-meter) fabrication processing, corrosion science, and polymer science. My works contribute to new understandings of the electrochemical behaviors at the interfaces of electrodes and electrolytes (nucleation and growth, alloying and dealloying) in at a wide range of scales and temperatures. Tailoring these processes to specific applications is an enduring challenge in electrochemical processes (e.g., deposition, extraction) as well as in the operation of the electrochemical devices (e.g., charge/discharge in batteries). As for teaching, I feel competent to handle most any course at the undergraduate and graduate levels based on my multidisciplinary research experiences and what I leaned in a teaching certificate program at MIT.
Expected End Date of Post Doctoral Position:
- Grid scale electrochemical energy storage
- Multi-valent battery for automobile propulsion
- Fabrication processes of bit patterned media for next generation hard disk drive by controlling the electrochemical nucleation and growth of magnetic alloy in nano-patterned substrate.
- Development of a surface enhanced raman sensor for analysis of reaction steps of reducing agent in electroless deposition process.
- Electrochemical fabrication of metallic silicon nanodot array using ionic liquid media for solar battery application.
- Investigation of silicon anodization to form high-aspect ratio micro porous structure and its application for bio sensing device.
Electrochemical processes (wet processes) have a pivotal role in conjunction with physical processes (dry processes) to fabricate 3D nano-micro structures for electronic devices. My PhD research under Professor Takayuki Homma at Waseda University was to develop a fabrication process of ferromagnetic nano-structures by using electrochemical deposition (i.e. electrodeposition and electroless deposition). The aim of this work was to establish a new fabrication process of a bit patterned magnetic recording media (BPM) for a hard disk drive (HDD). A BPM consists of an ordered ferromagnetic nanodot array, which has high crystallinity and uniformity, resulting in high magnetic properties that meet the performance specification of future HDDs. I investigated patterning processes (e.g. electron beam lithography, photo lithography, and nano-imprinting lithography) and electrochemical deposition processes on the nano-patterned substrates. I designed the deposition condition to control the nucleation and growth as well as the crystal structure and shape of the ferromagnetic materials in the nano-patterned substrate. As results, I uniformly formed a highly crystalline Co-based nanodot array a single nanometer in diameter in a large area on the substrate. To control and design the solid-liquid interfaces, I investigated the correlation between the surface reactivity (potential and catalytic activity) of the substrate and the initial stage of the deposition process. I found that uniformity of nucleation is influenced by the uniformity of relative surface potential on the substrate.
Top 5 Awards and honors (name of award, date received):
5 Recent Papers:
T. Ouchi, H. Kim, B. L. Spatocco, D. R. Sadoway, “Calcium-based multi-element chemistry for grid-scale electrochemical energy storage,” Nature communication, 7:10999, doi: 10.1038/ncomms10999 (2016).
B. L. Spatocco, T. Ouchi, G. Lambotte, P. Burke, D. R. Sadoway, “Low-Temperature molten salt electrolytes for membrane-free sodium metal batteries,” J. Electrochem. Soc., 162 (14) A2729-A2736 (2015).
T. Ouchi, H. Kim, X. Ning, D. R. Sadoway, “Calcium-Antimony Alloys as Electrodes for Liquid Metal Batteries,” J. Electrochem. Soc., 161(12) A1898-A1904 (2014).
K. Wang, K. Jiang, B. Chung, T. Ouchi, P. J. Burke, D. A. Boysen, D. J. Bradwell, H. Kim, U. Muecke, D. R. Sadoway, “Lithium–antimony–lead liquid metal battery for grid-level energy storage,” Nature, 514, 348–350 (2014).