The 3rd students’
associated seminar
Amezawa Lab.
Kawada Lab.
Yugami Lab.
Kawamura Lab.
Takamura Lab.
Lucent Takamiya, conference room
9-10 Aug., 2015
About lucent Takamiya, Yamagata zao
Time Table
1st day (Sunday, 9 Aug., 2015)
8:40
Meeting time (Sakura hall in Katahira)
9:00
Bus departure time
10:30 Arrival & Check-in
11:00 Opening ceremony
11:25 Short presentation 
12:00 Lunch
13:00 Short presentation II
14:00 Poster session I
15:15 Poster session II
16:30 Free time
18:30 Dinner
21:00 Banquet
Meeting place (片平さくらホール)
2d day (Monday, 10 Aug., 2015)
8:00
Breakfast (~9:00)
9:00
Preparation
9:30
Lecture I (by Prof. Kawamura)
10:40 Lecture II (by Prof. Yamaguchi)
11:40 Closing ceremony
12:00 Check-out
12:30 Lunch (Yamagata kanko bussan-kan)
14:00 Arrival (Sakura hall in Katahira)
Budget
・Accommodation fee
¥ 7,700
(Including dinner on 1st day and breakfast on 2nd day)
・Bathing tax
¥ 150
・Lunch on 1st day
¥ 650
・Bus fee
¥ 250
・Others
¥ 1,250
(Banquet, Recreation, Prize of Poster, etc…)
Total
¥ 10,000
Thank you for your cooperation.
Presentation schedule
Short presentation for poster session I (1st day 11:25-12:00)
No.
Presentation title
Presenter
Grade
Lab.
1
Experimental Evaluation of Electrochemical Properties of
Yuta Kimura
Mechanically Stressed Li Ion Batteries Cathodes
PD
Amezawa
2
Evaluation of Reaction Distribution in an SOFC Cathode
Yoshinobu Fujimaki D3
by Using Micro XAS Measurements
Amezawa
3
Experimental evaluation of electrochemical active area in
SOFC cathode by electrochemical impedance
Yusuke Shindo
spectroscopy measurements of patterned electrode
M1
Amezawa
4
Microstructural changes of nickel during the lowtemperature re-oxidation procedure
Zhao Fei
M1
Kawada
5
Degradation of oxygen electrode in SOEC operation
Hiroki Akabane
M1
Kawada
6
Investigation of Mechanical properties of SOFC
Electrolytes at High temperature
Tomohiro Kori
M1
Kawada
7
Characterization of the ferroelastic behavior of
La0.6 Sr0.4 Co0.2 Fe0.8 O3-δ
Kouhei Shishido
M1
Kawada
8
Evaluation of surface exchange coefficient of SOFC
cathode materials by pulse isotope exchange
Hiroshi Chiba
M1
Kawada
9
Suppression effect of carbon deposition on Ni by
coexisting oxides
Mitsuki Haga
M1
Kawada
M1
Kawada
M1
Kawada
M1
Yugami
Cathodic reaction of La0.6Sr0.4CoO3-d on proton-
10 conducting electrolyte SrZr0.9Y0.1O3-d under fuel cell Noda Shunsuke
condition
11
12
Modification of oxygen potential at (La,Sr)CoO(3-δ)
electrode surface
Dan Nonami
Design of low operating temperature micro-SOFC system
Shinpei Takahara
for mobile electronic devices
Short presentation for poster session II (1st day 13:00-13:45)
No.
Presentation title
1
High Sensitivity Detection of Mn Ion Dissolution by In
Situ 1H MRI
2
High volt stability of lithium borate thin-film as solid
electrolyte for all solid-state thin-film battery
3
Study of LiMn2O4 and prospect
4
Measurement of lithium-ion diffusion coefficient of thin
film battery materials by SIMS
5
Synthesis of rock-salt-type LiBH4 and its ionic
conductivity
6
Presenter
Grade
Lab.
Yoshiki Iwai
D
Kawamura
Haruka Itabashi
M2
Kawamura
Masakatsu Nakane
M1
Kawamura
Xiaoli Lu
M1
Kawamura
Takeya Mezaki
D2
Takamura
D1
Takamura
Yoshiaki Hayamizu
D1
Takamura
Enhancement of the lithium-ion conductivity of LiBH4 by
Akira Takano
hydration
7
Oxygen transport properties in Pr 2-xSrxCuO4-δ
8
Optical Coatings Using Rutile-type TiO2 Thin Films
Akihiro Ishii
M2
Takamura
9
Fabrication of composite anode using LiBH4 and the
charge/discharge behavior
Keita Kurigami
M2
Takamura
10
Oxygen storage capacity and kinetics of Ce-Zr-based
oxides
Junki Tomita
M2
Takamura
M1
Takamura
M1
Takamura
11
12
Water Vapor Adsorption Properties on CeO 2 Nanoparticles
Tai Misaki
and Its Application as a Heat Storage Material
Preparation of La-doped SrTiO3 Anode for Solid Oxide
Electrolysis Cell
Yuichi Murashima
Self-introduction and Short abstract
Amezawa Lab.
Name
: Koji AMEZAWA
Laboratory
: Amezawa
Course
: IMRAM, Professor
Hometown
: Yokkaichi, Mie
Hobby
: Diet, diet, diet…
Name
:中村 崇司
Laboratory
:雨澤研
Course
:助教
Hometown
:札幌
Hobby
:息子・娘との闘い
Name
: Yuta Kimura
Laboratory
: Amezawa lab
Course
: PD
Hometown
: Niigata
Hobby
: Taikan training, taikan training,
taikan training…
Title:
Experimental Evaluation of Electrochemical Properties of Mechanically Stressed Li
Ion Batteries Cathodes
All-solid state Li ion batteries are expected as one of next-generation rechargeable
batteries since they have the potential to achieve high energy density and are free of risk of a
flammable liquid electrolyte. The Li ion batteries cathodes, such as LiCoO2, change their volume
during insertion or extraction of Li ions. Therefore, mechanical stress can be induced at the
electrode/electrolyte interface. This mechanical stress can affect the electrochemical properties of
electrodes and electrolytes. In this study, we aimed to understand the influence of the mechanical
stress on the electrochemical properties of Li ion batteries cathodes.
Title
Name
: Yoshinobu Fujimaki
Laboratory
: Amezawa research group
Course
: Ph.D. candidate 3rd year
Hometown
: Iwate
Hobby
: Pikachu
: Evaluation of Reaction Distribution in an SOFC Cathode
by Using Micro XAS Measurements
Solid Oxide Fuel Cell (SOFC) is one of the promising energy conversion devices because
of its high efficiency and fuel flexibility. As an SOFC cathode, mixed ionic/electronic conductor
(MIEC) is typically used. In an electrode consisting of MIEC, the electrochemical reaction can
progress on the double-phase boundary (DPB) of the gas/electrode. In a porous MIEC electrode, the
electrochemical reaction does not homogeneously occur in whole area of the electrode because of its
material properties and microstructure. In this study, the electrochemically reaction distribution in a
porous and a columnar modeled SOFC cathode were evaluated by using micro X-ray absorption
spectroscopy (XAS). These results will be compared and discussed in my poster.
Name
: Yusuke Shindo
Laboratory : Amezawa
Course
: Grad. Sch. of Engineering, M1
Hometown : Sapporo (Hokkaido pref.)
Hobby
: Listening Music, Anime…
Title:
Experimental evaluation of electrochemical active area in SOFC cathode
by electrochemical impedance spectroscopy measurements of patterned electrode
MIEC materials used in SOFC cathode have smaller electrochemical active area than its
thickness. But the width of the electrochemical active area is not generally experimented because of
the complicated microstructure in the real SOFC electrode. Then, we suggest using the patterned
electrode which has a model structure simulating the porous electrode. In this, a porous structure is
simplified to be a dense columnar electrode which is divided into two parts and expanded
horizontally. This has electrode / electrolyte interface only at the root of the column. This seems the
electrochemical active area should form from here. We evaluated the electrochemical active area by
electrochemical impedance spectroscopy measurement of the patterned electrode.
Kawada Lab.
Name
: Tatsuya Kawada
Laboratory
: Kawada lab
Hometown
: Gumma, Japan
Hobby
: eating, drinking
Name
: Keiji Yashiro
Laboratory
: Kawada lab
(Associate Professor)
Hometown
: Kanagawa, Japan
Hobby
: Art appreciation
Name
: Zhao Fei
Laboratory
: Kawada Lab.
(文字の 7~10 行分くら
Course
: Environmental studies
いの大きさで自由に)
Hometown
: HeFei, China
Hobby
: Ride bicycle
画像
TiTle:
Microstructural changes of nickel during the low-temperature re-oxidation procedure
SOFC anode material requires good mechanical stability under SOFC operation situations.
Thermal expansion coefficient of Ni/YSZ is usually similar with electrolyte material YSZ, so the
volume change caused by temperature change will not cause serious impaction to cell, but in some
special cases that the anode material contract during re-oxidation, it will increase the stress for
electrolyte, then cause fracture. In order to avoid this kind of damage, we should clarify the
mechanism of this special phenomenon. In my studies, my purpose is finding a model to clarify the
mechanism of the special contraction phenomenon and confirm the model by observing its
microstructural changes during low-temperature re-oxidation procedure.
Name
: Hiroki Akabane
Laboratory
: Kawada Lab
Course
: Environmental Studies M1
Hometown
: Ibaraki，Japan
Hobby
: Mah-jong，Soccer，Ramen
TiTle:
Degradation of oxygen electrode in SOEC operation
High temperature steam electrolysis using a solid oxide which is known as a highefficiency hydrogen production method has a problem in long-term durability. In this study, we
prepared the electrochemical cell with LSCF (La0.6Sr0.4Co0.2Fe0.8O3) and performed long-term
reliability test in SOEC (Solid Oxide Electrolysis Cell) operation to evaluate the time course of the
electrode characteristics by the AC impedance measurement. The cross section surface of the cells
before and after the test was also observed by using SEM in order to qualitatively evaluate the time
course of the fine structure of the cell.
Photo
4×3cm
Name
： Tomohiro Kori
Laboratory
： Kawada Lab.
Course
： Environmental Studies, M1
Hometown
： Miyagi, Japan
Hobby
： Volleyball, VideoGame
TiTle:
Investigation of Mechanical properties of SOFC Electrolytes at High temperature
In past study of solid oxide fuel cells (SOFCs), our group investigated the Young’s modulus
of (Sc2O3)0.1(ZrO2)0.89(CeO2)0.01 (ScSZ) and La0.9Sr0.1Ga0.2Mg0.8O3 (LSGM) at high temperatures by
the resonance measurement. It was found that the Young’s modulus of ScSZ and LSGM significantly
decreased with increasing temperature at low temperatures. Also, ScSZ and LSGM is known to be
ferroelastic at low temperatures. Such a thing may affect the Young’s modulus of ScSZ and LSGM.
In this study, we examine the effect of the ferroelasticity on the Young’s modulus of ScSZ and
LSGM by the resonance measurements, dynamic mechanical analysis and uniaxial compression
tests.
Name
: Kouhei Shishido
Laboratory
: Kawada Lab.
Course
: Environmental Studies, M1
Hometown
: Kanagawa, Japan
Hobby
: Soccer
TiTle:
Characterization of the ferroelastic behavior of La0.6Sr0.4Co0.2Fe0.8O3-δ
The mechanical properties or the behavior under the stress of components of solid oxide
fuel cells (SOFCs) should be understood to suppress mechanical failures. For above background, our
group investigated the Young’s modulus of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) at high temperatures by
the resonance measurement. It was found that the mechanical properties of LSCF depended on
environment (temperature, oxygen partial pressure) and that LSCF showed the ferroelastic behavior.
It isn’t clear how the ferroelastic behavior influences on SOFCs because there are few data about it.
In this study, the ferroelastic behavior is characterized by using Electron Backscatter Diffraction
(EBSD).
Name
:Hiroshi Chiba
Laboratory
:Kawada Lab
Course
:Environmental Studies,M1
Hometown
:Tokyo Japan
Hobby
:nomikai
TiTle:
Evaluation of surface exchange coefficient of SOFC cathode materials by pulse isotope
exchange
LSC64 and LSCF6428 has been recognized as good cathodes for SOFC. Their high oxide
ion conductivity makes oxygen reduction reaction possible to occur not only at triple-phase
boundary but also on two-phase boundary of an electrode and gas phase. Thus, it is important to
study the surface exchange kinetics to understand the surface oxygen reduction process. In this study,
we attempted to determine the surface exchange kinetics by pulse isotope exchange. This is new
method to determine k* by observe the sample response when 16 Oxygen exchanged by the isotope.
The response and k* will be discussed in this study.
Name
: Mitsuki Haga
Laboratory
: Kawada lab
Course
: Environmental Studies, M1
Hometown
: Gumma, Japan
Hobby
: futsal, ramen
TiTle:
Suppression effect of carbon deposition on Ni by coexisting oxides
The risk of carbon deposition on an anode is concerned one of the serious degradation
factors for its performance, reliability, and durability. Shindo-san checked the carbon
deposition/removal of composite electrode of Ni-SZY, Ni-YSZ, Ni-CeO2, Ni-GDC, (volume ratio
40:60) using a TG which is controlled atmosphere to ensure the carbon deposition/removal.
Composite electrode of Ni-GDC could not suppress carbon deposition however GDC substrate
suppresses the carbon deposition at Ni particle surface on GDC because of the SMSI (strong metal
support interaction) like phenomenon. In this study, we clarified what happen on Ni-GDC specimen
with SEM and AE mapping image of that.
Name
:Noda Shunsuke
Laboratory
:Kawada Lab
Course
:Environmental Studies
Hometown
:Hyogo, Japan
Hobby
:Tennis, Beer
TiTle:
Cathodic reaction of 𝐋𝐚𝟎.𝟔 𝐒𝐫𝟎.𝟒 𝐂𝐨𝐎𝟑−𝛅 on proton-conducting electrolyte 𝐒𝐫𝐙𝐫𝟎.𝟗 𝐘𝟎.𝟏 𝐎𝟑−𝛅
under fuel cell condition
Cathodic reaction of protonic ceramic fuel cells (PCFCs) using SrZrO3 based proton
conducting electrolyte with perovskite oxide cathode was studied. A cathode porous La0.6Sr0.4CoO3−δ (LSC) was sintered on SrZr0.9Y0.1O3−δ (SZY) electrolyte. PCFC has possibilities to
conduct proton, oxygen and hole. Moreover, it showed under oxidant atmosphere there is large effect
of hole. Thus, it was difficult to evaluate cathodic performance of the dense LSC electrode.
Therefore the porous LSC was measured by impedance spectra, DC polarization measurement and
gas analysis of cathode under fuel cell condition. The result of the experiment will be discussed in
order to evaluate cathodic performance.
Name
:Dan Nonami
Laboratory
:Kawada Lab
(文字の 7~10 行分くら
Course
:Environmental Studies, M1
いの大きさで自由に)
Hometown
:Ehime, Japan
Hobby
:Sukiyaki
画像
TiTle:
Modification of oxygen potential at (La,Sr)CoO(3-δ) electrode surface
In previous study, electrochemical measurements were performed using a cell which have
a (La,Sr)CoO(3-δ) film electrode fabricated on a Ce0.9Gd0.1O1.95 electrolyte by using a Pulsed Laser
Deposition(PLD) and at the same time, the oxygen potential on the electrode was monitored, and it
showed the interesting result which is that the oxygen chemical potential drastically changes at the
surface of LSC. Based on that, I tried electromotive force measurements using Porous Oxygen
Sensor(POS) which putted on the LSC surface as a surface prove and analyzed the modification of
oxygen potential at (La,Sr)CoO(3-δ) electrode surface.
Yugami Lab.
Name
: Shinpei Takahara
Laboratory
: Yugami,Shimizu/Iguchi Lab.
Course
: Mechanical engineering, M1
Hometown
: Niigata
Hobby
: Beer, Singing, Game, etc…
Design of low operating temperature micro-SOFC system for mobile electronic devices
We are not satisfied with battery in mobile electronic devices such as smart phone. Hence,
micro-SOFC is expected as what substitution for new battery of these because of high energy
efficiency and density. However, micro-SOFC need to be improved about mechanical stability to
substitute for these. As a connected theme, it was reported that success with power generation using
porous silicone as support layer in PEFC. Existence of support layer leads to improve of this
problem. This time, I will report about control of residual stress in electrolyte thin film (YSZ), in
addition, results of basic research about application of porous silicone to micro-SOFC to improve
mechanical stability.
Kawamura Lab.
Name
:Junichi Kawamura
Post
:Professor
Hometown
:Nagano,Japan
Hobby
:Fireworks,toy repair
Name
:Yoshiki Iwai
Laboratory
:Kawamura Lab.
Course
:Physics,Post doc.
Hometown
:Miyagi,Japan
Hobby
:Bicycle
High Sensitivity Detection of Mn Ion Dissolution by In Situ 1H MRI
Spinel LiMn2O4 is a promising cathode material for lithium ion batteries due to its high
capacity, low toxicity, low cost and high natural abundance of Mn. However dissolution of Mn ion
from the cathode is a problem for battery life because it leads to degradation of the cathode. In
addition, the dissoluted Mn ion is deposited on the anode material, which leads to a decrease of
lithium ion conductivity. Here we report a new in-situ detection technique of Mn ion by 1H MRI
(Magnetic Resonance Imaging). It can detect dissolute Mn ion from the cathode at ppm-levels.
With charging and discharging of the battey, the rel
Name
：
Haruka Itabashi
Laboratory
：
Kawamura Lab.
Course
：
Physics,M2
Hometown
：
Sendai,Japan
Hobby
：
Reading
High volt stability of lithium borate thin-film as solid electrolyte
for all solid-state thin-film battery
The lithium borate glass (Li-B-O) thin-film was prepared by pulsed laser deposition
method using ArF excimer laser. The ionic conductivity, crystal structure and compositions of thin
film were examined. The ionic conductivity values of the thin-films were 5.7×10-8 Scm-1 at room
temperature. The activation energy of the thin-film was 0.63 eV. The electrochemical window of the
Li-B-O thin-film was from 0 to 8.0 V vs. Li/Li+. All-solid-state thin-film battery (TFB) was
successfully fabricated using Li-B-O thin film as an electrolyte with LiCoMnO4 cathode and Li
metal anode, whose charge-discharge voltage is between 3.0 and 5.5 V.
Name
: Masakatsu Nakane
Laboratory
: Kawamura Lab.
Course
: Physics, M1
Hometown
: Aichi, Japan
Hobby
: Special Secrecy
Study of LiMn2 O4 and prospect
LiMn2 O4 is researched actively as lithium cathode materials because of comparatively
rich manganese reserves on the earth. LiMn2 O4 has spinel-structure and has attracted interest by its
physical properties. In this study, LiMn2 O4 pellet was fabricated by solid-phase synthesis as a
target for pulsed laser deposition (PLD) which thin film batteries are fabricated by.
Name
:Xiaoli Lu
Laboratory
:Kawamura Lab.
Course
:Physics,M1
Hometown
:Shandong,China
Hobby
:Sleeping
Measurement of lithium-ion diffusion coefficient of thin film battery materials by SIMS
In this study, secondary ion mass spectrometry (SIMS) is utilized as a new and direct
way to measure the diffusion coefficient of lithium ions in the solid state electrolyte Li3PO4. Thin
films of 6Li3PO4 were prepared by pulsed laser deposition (PLD), and then half of the thin film was
immersed in 7Li-solusion to allow for the exchange of 6Li and 7Li. The sample was placed in
different temperatures to allow for diffusion. The distribution of isotopes (6Li and 7Li) could be
obtained by SIMS due to the difference in mass between the two isotopes, and then using the ratio of
the amount of each isotope diffused, the diffusion coefficient of the lithium ions could be
determined.
Name
:
Shotaro Endo
Laboratory
:
Kawamura Lab.
Course
:
Physics,B4
Hometown
:
Akita,Japan
Hobby
:
Golf
Takamura Lab.
Name
: Hitoshi Takamura
Laboratory
: Takamura lab.
Post
: Professor
Hometown
: Sizuoka
Hobby
: Cycling, Running
Name
: Itaru Oikawa
Laboratory
: Takamura lab.
Post
: Assistant professor
Hometown
: Okayama
Hobby
: Cycling, Kabuki
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: Takeya Mezaki
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaLaboratory
: Takamura lab.
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaCourse
: Material engineering, D2
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaHometow
: Niigata, Japan
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaHobby
: HR/HM music
Synthesis of rock-salt-type LiBH4 and its ionic conductivity
Rock-salt-type LiBH4 is one of the candidate solid electrolytes for all-solid-state lithium
batteries. An isotropic ion-conducting path in its structure is expected to enhance efficiency of
electrode reactions. However, structural stabilization of this phase is required because of its
instability under ambient pressure. In this study, KI-LiBH4 and NaI-LiBH4 systems are focused on to
stabilize that phase under ambient pressure. Crystal structure and ionic conductivity for those
systems are clarified.
Name
: Akira Takano
Laboratory
: Takamura Lab.
Course
: Department of Materials Science
Hometown
: Niigata
Hobby
: Cooking
Enhancement of the lithium-ion conductivity of LiBH4 by hydration
Lithium borohydride (LiBH4) is a candidate material for a solid electrolyte of
all-solid-state lithium secondary batteries. It shows high Li-ion conductivity by phase transition
above 115°C. Meanwhile, it is known that LiBH4 itself and the dopants easily react with water; the
hydrated water may affect electrochemical properties of LiBH4. In this study, the effects of hydration
on lithium-ion conductivity of LiBH4 were investigated. Hydrated LiBH4 has a high lithium-ion
conductivity of 4.89×10–4 S · cm–1 at 45°C. It was suggested that the enhancement was attributed to
the motion of structural water molecules.
Name
: Yoshiaki Hayamizu
Laboratory
: Takamura Lab.
Course
: Materials Science, D1
Hometown
: Mitaka, Tokyo
Hobby
: Bicycle racing
Oxygen transport properties in Pr2-xSrxCuO4-δ
Pr2-xSrxCuO4-δ is one of the Ruddlesden-Popper series oxides in K2NiF4-type structure.
Substitution of relatively large Sr causes the transition of the crystal structure from T’-type, which
has the Fluorite-type layers, to T* and T-type, which has the Rocksalt-type layers, and this results in
different oxygen transport properties. Furthermore, the anisotropic structure should also affect on the
transport properties, as being reported for other K2NiF4-type oxides. Using Pulsed-laser Deposition
(PLD), Pr2CuO4 and Pr1.6Sr0.4CuO4-δ were grown in different direction on YSZ(100) substrate. The
results of electrical impedance spectroscopy on these thin films and bulk oxygen permeation
measurements will be reported on my poster.
Name
: Akihiro Ishii
Laboratory
: Takamura Lab.
Course
: Materials Science, M2
Hometown
: Hokkaido, Japan
Hobby
: Eating something sweet
Optical Coatings Using Rutile-type TiO2 Thin Films
Rutile-type TiO2 thin films showed the highest refractive index in all transparent materials,
therefore, they are expected to improve reflection properties and to extend design freedom of optical
coatings (e.g. antireflection coatings, dielectric mirrors). However, it is not carried out yet, since the
rutile phase is a high temperature phase (~500°C) and such high temperature leads rough surface.
This study developed a crystal growth control technique for TiO2 thin films, which enabled a
low-temperature preparation of the rutile-type TiO2 thin films and a fabrication of the optical
coatings using them.
Name
:Keita Kurigami
Laboratory
:Takamura lab.
Course
Hometown
:Materials Science & Engineering, M2
:Shizuoka, Japan:
Hobby
:Horse racing
Fabrication of composite anode using LiBH4 and the charge/discharge behavior
Recently, all-solid-state lithium battery has attracted much attention because of safe and
flexible design. We focus on LiBH4 as a solid electrolyte. This material has good formability and
chemical compatibility with Li metal. However, Li dendritic growth and dead Li were observed by
using Li metal anode. In this study, composite anodes of carbon+LiBH4 or carbon+In+LiBH4 were
investigated. Ball-milled composites had big irreversible capacity. On the other hand, hand-milled
one had good cycle performance. In addition, a two-layered anode, B-MAG|AB+In+LiBH4 was
investigated.
Name
: Junki Tomita
Laboratory
: Takamura Lab.
Course
: Materials Science & Engineering
Hometown
: Saitama, Japan
Hobby
: movie, climbing
Oxygen storage capacity and kinetics of Ce-Zr-based oxides
Ce-Zr-based oxides are applied as a promoter of three-way catalysts because of their high
Oxygen Storage Capacity (OSC). It is one of the important functions required to efficiently purify
exhaust gas in automobile. Quantitative evaluation of OSC has been demanded for improvement of
catalysts, so we focus on PO2 dependence and kinetics in oxygen storage and release. PO2
dependence of OSC was measured by coulometric titration and the activation energy of oxygen
vacancy formation was calculated. Oxygen isotope exchange and depth profile were performed to
determine oxygen diffusion coefficient, D*, and surface exchange coefficient, k.
Name
: Tai Misaki
Laboratory
: Takamura lab
Course
: Material
Hometown
: Toyama
Hobby
: Cycling, Running,
Water Vapor Adsorption Properties on CeO2 Nanoparticles and
Its Application as a Heat Storage Material
Oxide nanoparticles have a high specific surface area, and it can adsorb a high quantity of
water vapor. The adsorption and desorption are accompanied by the exothermic and the endothermic
reactions. Therefore, we considered oxide nanoparticles as a heat storage material. In the case of
oxide nanoparticles, desorption and adsorption take place at R.T., so low-grade energy can be reused.
In this study, I focused on CeO2 nanoparticles which can be synthesized easily. To investigate heat
storage capacity of this system volumetric water vapor adsorption analysis was carried out.
Name
: Yuichi Murashima
Laboratory
: Takamura lab.
Course
: Materials Science, M1
Hometown
: Osaka
Hobby
: Soccer
Preparation of La-doped SrTiO3 Anode for Solid Oxide Electrolysis Cell
Solid Oxide Electrolysis Cell (SOEC) converts steam to hydrogen gas by electronic power.
SOEC required lower electric energy and utilized thermal energy at higher temperature. Our group is
looking at SOFC-SOEC combined system in which SOEC is used to enrich fuel gas and utilize
waste heat from SOFC. In this case, anode is exposed to reducing atmosphere. So, anode material is
required stability in reducing atmosphere. In my study, La-doped SrTiO3 (LST) is applied for anode
of SOEC. The cell with 20mol%La-doped SrTiO3 (LST20) anode sintered at 1200 ℃ shows low
resistance and good electrolysis performance.