28 research outputs found
Spectrally Selective Emitters with Deep Rectangular Cavities Fabricated with Fast Atom Beam Etching
科研費報告書収録論文(課題番号:11555057・基盤研究(B)(2)・H11~H13/研究代表者:湯上, 浩雄/太陽熱光起電力による高温輻射-電力直接変換システムの開発
Solar thermophotovoltaic using Al2O3/Er3 Al5O12 eutectic composite selective emitter
科研費報告書収録論文(課題番号:11555057・基盤研究(B)(2)・H11~H13/研究代表者:湯上, 浩雄/太陽熱光起電力による高温輻射-電力直接変換システムの開発
Surface microstructured selective emitters for TPV systems
科研費報告書収録論文(課題番号:11555057・基盤研究(B)(2)・H11~H13/研究代表者:湯上, 浩雄/太陽熱光起電力による高温輻射-電力直接変換システムの開発
A Broadband antireflection for GaSb by means of subwavelength grating (SWG) structures
科研費報告書収録論文(課題番号:11555057・基盤研究(B)(2)・H11~H13/研究代表者:湯上, 浩雄/太陽熱光起電力による高温輻射-電力直接変換システムの開発
Investigation of cathodic reaction in SOFCs and PCFCs by using patterned thin film model electrodes
In recent years, fuel cells operating at relatively high temperatures, such as solid oxide fuel cells (SOFCs) using an oxide ion conducting electrolyte and proton ceramics fuel cells (PCFCs) using an proton conducting electrolyte, attract attentions as high-efficient energy-conversion devices. For further enhancements of the performance and the durability of SCFCs and PCFCs, it is essential to understand the electrode reactions. In particular, the knowledge on the dominant reaction path in the electrodes would help us to optimize the material and the microstructure of the electrode.
Please click Additional Files below to see the full abstract
Crystallization process of perovskite type oxide thin films deposited by PLD without substrate heating: Influence of sputtering rate and densification-driven high tensile strain
Crystallization process in non-heating pulsed laser deposition (PLD) and the following post-annealing route for
perovskite oxide thin film fabrication has been studied. Remarkable influence of sputtering rate on crystallization
temperatures is demonstrated for BaZrO3 and SrZrO3 thin films in this process. Crystalline nuclei formation
occurs randomly in the thin films deposited at a high sputtering rate which leads to the faster crystallization at
a lower temperature, while it occurs predominantly at the substrate or interlayer interface at a higher temperature
when the sputtering rate is very low, which is also reinforced by the atomic oxygen irradiation upon deposition.
It should be noted that crystalline thin film synthesis of BaZrO3 is possible at a post-annealing temperature
below200 °Cwhen the sputtering rate is relatively high. On the other hand, obtained thin films showhigh tensile
strainwhich is not related to the difference in thermal expansion coefficient between substrate and thin film, but
is found to be due to the densification upon crystallization. The tensile strain is relaxed when the thin films are
annealed at 750 °C or above, while the strain is very stable at a temperature as low as 600 °C for 1 week
Enhancement of Proton Transport in an Oriented Polypeptide Thin Film
Proton transport properties of a partially
protonated poly(aspartic acid)/sodium polyaspartate (P-Asp)
were investigated. A remarkable enhancement of proton
conductivity has been achieved in the thin film. Proton
conductivity of 60-nm-thick thin film prepared on MgO(100)
substrate was 3.4 × 10−3 S cm−1 at 298 K. The electrical
conductivity of the oriented thin film was 1 order of magnitude
higher than the bulk specimen, and the activation energies for
the proton conductivity were 0.34 eV for the oriented thin film
and 0.65 eV for the pelletized sample, respectively. This
enhancement of the proton transport is attributable to the
highly oriented structure on MgO(100) substrate. This result
proposes great potential for a new strategy to produce a highly proton-conductive material using the concept of an oriented thin
film structure without strong acid groups