著者

田口 正美 馬場 司 神田 和紀

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.62, no.5, pp.481-487, 1998 (Released:2008-04-24)

参考文献数

14

被引用文献数

1 1

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The thin film PbO2/PbO/Pb solid cells were produced by reactive sputtering and vacuum evaporation on glass substrates, and the discharge properties were investigated. A PbO2 layer was obtained by sputtering of the Pb target in oxygen plasma. PbO, which is an oxygen ion conductor, was deposited from β-PbO powder in a vacuum. The open-circuit voltage of the PbO2/PbO/Pb cell was in good agreement with the theoretical value based on the thermodynamic data, and the partial transformation of β-PbO to α-PbO in the electrolyte did not show any marked change in voltage. The close-circuit voltage, which could be measured by connecting with a 100 kΩ resistor, was deteriorated by doping of the Bi3+ ion to the electrolyte, PbO. On the other hand, the doping of the K+ ion inhibited the decrease in discharge voltage. Moreover, the charge-discharge cycling test revealed that the PbO2/PbO/Pb cell could be charged to behave as a storage battery and that the connection of the cells in series and in parallel supplied a higher electromotive force and a larger capacity.

著者

大久保 敬祐 高橋 弘樹 田口 正美

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.135, no.2, pp.8-14, 2019-02-28 (Released:2019-02-21)

参考文献数

27

被引用文献数

1

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Pushed by human activities, the atmospheric CO2 concentration has reached levels which have made extreme weather events more likely, and which threaten permanent climate changes for the world. In order to combat this, CO2 emissions must be reduced significantly. Electricity production and industry are two sectors which contribute greatly to the production of CO2, thus a reduction in the amount of CO2 produced by thermal power plants and factories could make a significant contribution to combatting climate change. The electrochemical reduction of CO2 in those sources is considered very likely to be a solution to the problem. In this study, the activity of a Pt oxide electrode in the electrochemical reduction of CO2 was investigated in a sulfuric acid solution. Pt oxide electrodes have shown superior activity for the methanol oxidation reaction, which is the reverse reaction of CO2 electrochemical reduction. Cyclic voltammetry of the Pt oxide electrode in a CO2-saturated H2SO4 solution showed a definite anodic peak at 0.6-0.8 V vs. SHE, which was not observed in an Ar-deaerated electrolyte. Thus, it was determined that the anodic peak could be related to the re-oxidation of the reduction product of CO2 during cathodic polarization. The activity of the Pt oxide electrode for CO2 reduction was much higher than that of the Pt electrode. It was concluded that the residual oxygen, which was hardly detected in the Pt electrode, improved the activity for CO2 electrochemical reduction on the Pt oxide electrode. Gas chromatography-mass spectrometry of the electrolytic solution after CO2 reduction revealed that the reduction product was mainly CH3OH. These results should be very useful for developing a new electrochemical reduction system for converting CO2 into CH3OH.