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2003 Fiscal Year Final Research Report Summary

Improvement of Electrode Performance on the Alkali Metal Thermal to Electric Converter

Research Project

Project/Area Number 13680583
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field エネルギー学一般
Research InstitutionShizuoka Institute of Science and Technology

Principal Investigator

TANAKA Kotaro  Shizuoka Institute of Science and Technology, Department of Mechanical Engineering, Associated Professor, 理工学部, 助教授 (60278215)

Co-Investigator(Kenkyū-buntansha) FUJII Takahiro  National Institute of Advanced Industrial Science and Technology, Researcher, 電力エネルギー研究部門, 研究員
Project Period (FY) 2001 – 2003
KeywordsThermoelectric Converter / Direct Energy Conversion / AMTEC / Laser-induced CVD / Molybdenum Electrode
Research Abstract

Micron-scale current collection leads for the Alkali Metal Thermal to Electric Converter (AMTEC) have been proposed and discussed in this study. The current collection leads are directly deposited on cathode side surfaces of the solid beta"-alumina electrolyte to eliminate the necessity for the conventional tied-on metal meshes. The new current collection leads also reduce electrical and mass transfer resistance in the cathode side electrodes of the AMTEC devices.
The mass transport characteristics of sodium through the porous electrode strongly influence the output performance of the AMTEC cycle. Electrode electrical resistance and contact resistance between the porous electrode and the current collector also cause significant lowered power output in the AMTEC cycle. In order to improve the overall performance, both mass transport and electrical resistance must be improved simultaneously. The micron-scale current leads have a possibility to lower the overall electrical resistance with … More small increase in the mass transport resistance.
The sodium exposure test cell (SETC) was newly fabricated and used to measure the mass transfer characteristics in the porous molybdenum electrode. The measured performance was examined and a mass transport model on the electrodes was introduced. On the other hands, the electrical characteristics of the leads were experimentally examined. The current leads of molybdenum were linearly deposited by Ar laser-induced thermal CVD method. The influence of depositing conditions, such as pressure, laser power, and writing speed, on the formed width and thickness of the leads was examined. The electrical resistance was also measured and the measured volumetric resistance of the deposited leads was 4-6 times as high as that of the bulk molybdenum.
The analysis based on the measured data was also conducted. Various configurations include optimum width, distance and thickness were calculated. Compared result of the electrode performance having direct deposited current leads with that of the conventional tied-on collector has shown that its power density is about 35% higher even with its low electrical volumetric resistance. The effective of the current lead structure proposed in this study was verified. If the volumetric resistance of the deposited leads can be improved, much higher performance is expected with this method. Less

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] K.Tanaka: "Experimental Evaluation of Electrode Conversion Efficiency of Alkali Metal Thermal to Electric Converter"Hear Transfer-Asian Research. 30・3. 234-244 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 田中耕太郎: "低温作動型AMTECセルの発電性解析"化学工学論文集. 27・6. 819-823 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tanaka: "Wick Design Method and Simulation of Sodium recirculation for AMTEC Cycles"Proc. 2^<nd> Waste Heat Utilization Technology Workshop. 2. 38-45 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tanaka: "Thermal Designing on a Small-Sized AMTEC Cell"Proc. 37th Intersociety Energy Conversion Engineering Conference. No.20021,1-No.20021,6 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 田中耕太郎: "高周波インピーダンス法を利用したAMTECカソード側電極性能パラメータの特性評価"静岡理工科大学紀要. 11. 24-34 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 柳田友太: "レーザCVD法による電流リード構造のAMTEC電極への応用について"静岡理工科大学紀要. 11. 323-326 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 田中耕太郎: "低温作動型AMTECセルのカソード側Mo電極内物質移動の特性評価"化学工学論文集. 30・1. 73-78 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tanaka: "Experimental Evaluation of Electrode Conversion Efficiency of Alkali Metal Thermal to Electric Converter"Heat Transfer-Asian Research. 30-3. 234-244 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Tanaka: "Performance Evaluation of a Low-temperature-type AMTEC Cell"Kagaku Kogaku Ronbunshu. 27-6. 819-823 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Tanaka: "Wick Design Method and Simulation of Sodium recirculation for AMTEC Cycles"Proc. 2^<nd> Waste Heat Utilization Technology Workshop. 38-45 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Tanaka, T.Fujii, T.Honda: "Thermal Designing on a Small-Sized AMTEC Cell"Proc.37th Intersociety Energy Conversion Engineering Conference. No.20021. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Tanaka: "Evaluation of Fundamental Parameters for AMTEC Cathode Side Electrodes with A.C. Impedance Measurement"Bulletin of Shizuoka Institute of Science and Technology. 11. 23-34 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Yanagita: "Applying Laser Induced CVD Method to Electrical Lead Structure of AMTEC Cathode Side Electrodes"Bulletin of Shizuoka Institute of Science and Technology. 11. 323-326 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Tanaka: "Performance Evaluation on Mass Transport in Cathode-side Molybdenum Electrodes for a Low-temperature-type AMTEC Cell"Kagaku Kogaku Ronbunshu. 30-1. 73-78 (2004)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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