著者
Tetsuya YAMADA Satoshi KAWAICHI Akihisa MATSUYAMA Minoru YOSHIDA Nobuhiro MATSUSHITA Ryuhei NAKAMURA
出版者
公益社団法人 電気化学会
雑誌
Electrochemistry (ISSN:13443542)
巻号頁・発行日
vol.84, no.5, pp.312-314, 2016-05-05 (Released:2016-05-05)
参考文献数
19
被引用文献数
3

The present study investigated extracellular electron transfer (EET) of Pseudomonas stutzeri, a model organism for bacterial denitrification. Electrochemical cultivation of P. stutzeri in a lithotrophic medium with Fe2+ ions generated the clear cathodic current associated with denitrification reactions. The EET ability of P. stutzeri was greatly strengthened by the addition of acetate, which correlated with the enhanced rate of the enzymatic oxidation of Fe2+. Since the addition of acetate induced the change of cellular metabolisms from lithotrophic denitrification to mixotrophic one, the present finding suggests the effectiveness of EET monitoring as a descriptor of bacterial denitrification activity and changing metabolisms according to the environmental conditions.
著者
Karthik KRISHNAN Tomoaki YAMADA Hiroko IWATSUKI Mitsuo HARA Shusaku NAGANO Kazuya OTSUBO Osami SAKATA Akihiko FUJIWARA Hiroshi KITAGAWA Yuki NAGAO
出版者
公益社団法人 電気化学会
雑誌
Electrochemistry (ISSN:13443542)
巻号頁・発行日
vol.82, no.10, pp.865-869, 2014-10-05 (Released:2014-10-05)
参考文献数
36
被引用文献数
1 11

The organized structure and proton transport property in sulfonated polyimide (SPI) thin film have been studied, much less is known at the interfacial charge transport during confinement of such materials. The proton conductivity of SPI thin film is correlated well with the highly oriented polymer structures as determined by infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (p-MAIRS) and in situ RH dependent synchrotron grazing incidence X-ray diffraction (GI-XRD). The high proton conductivity of 2.8 × 10−1 S cm−1 at 80°C and 90% RH was achieved in the highly oriented SPI thin film. In contrast, the bulk SPI showed the drop of conductivity value at high relative humidity region, which is due to the significant structural disorder accompanied by the strong interaction between the sulfonic acid side chains and water molecules.
著者
亀山 直人
出版者
公益社団法人 電気化学会
雑誌
電氣化學 (ISSN:03669440)
巻号頁・発行日
vol.2, no.4, pp.109, 1934-04-05 (Released:2019-11-21)
著者
He SUN Lina SUN Takashi SUGIURA Matthew S. WHITE Philipp STADLER Niyazi S. SARICIFTCI Akito MASUHARA Tsukasa YOSHIDA
出版者
公益社団法人 電気化学会
雑誌
Electrochemistry (ISSN:13443542)
巻号頁・発行日
vol.85, no.5, pp.253-261, 2017-05-05 (Released:2017-05-05)
参考文献数
31
被引用文献数
14

Microwave-assisted hydrothermal synthesis of ZnO nanocrystals has resulted in two distinctive structures: hexagonal bi-pyramidal (HBP) and nano-sheet (NS) shapes from Zn(CH3COO)2 solutions containing triethanolamine or benzene tetracarboxylic acid as structure directing agents, respectively. Observation by field-emission scanning electron microscope, high resolution transmission electron microscope as well as analysis of selected area electron beam diffraction patterns revealed that the predominantly exposed facets of HBP and NS ZnO are (102) and (100) faces, occupying 84 and 76% of the total surface area, respectively. Adsorption of D149 and eosin Y photosensitizer dyes onto HBP and NS ZnO was studied in comparison with a randomly structured commercial ZnO nanocrystal (MZ). Density of dye packing was found to be in the order of HBP > MZ > NS, for which HBP was 2 to 5 times higher than NS. Consequently, dye-sensitized solar cells employing HBP ZnO exhibited the highest short circuit photocurrent, but also the lowest open circuit voltage. By contrast, the DSSCs employing NS ZnO exhibited the highest voltage among the three.
著者
竹上 賢吾 古屋 長一
出版者
公益社団法人 電気化学会
雑誌
Electrochemistry (ISSN:13443542)
巻号頁・発行日
vol.74, no.10, pp.825-827, 2006-10-05 (Released:2012-03-20)
参考文献数
8
被引用文献数
1 2

Zinc negative electrode has high energy density and less expensive materials for battery in general. However, it generates dendrite when it charged as electrode for secondary battery, therefore, the use for secondary battery is difficult. At this opportunity we would make secondary battery using zinc with aqueous electrolyte. We discovered the dendrite is controlled by glycerin and saccharin in ZnSO4 solution. Lithium manganate is one of opposite electrodes that performed in this condition. In this study, we made aqueous lithium ion-zinc secondary battery with those electrodes and electrolyte, and evaluated then optimized that performance. This battery has approximately 100% charge-discharge efficiency. Their charge and discharge cycle performance depends on concentration of ZnSO4 and mass of LiMn2O4. The density of most suitable ZnSO4 for LiMn2O4 of each mass may be existing. Relatively higher percentage of LiMn2O4 mix has better performance. This battery performed more than 400 charge and discharge cycles as maximum and 70 mAh·g−1 as maximum of discharge capacity was provided. Furthermore, we can expect future improvement of performance as a secondary battery by optimizing these conditions.

2 0 0 0 OA 重水の話

著者
千谷 利三
出版者
公益社団法人 電気化学会
雑誌
電氣化學 (ISSN:03669440)
巻号頁・発行日
vol.22, no.12, pp.658-661, 1954-12-05 (Released:2019-11-15)