TITLE

Size effect of nanometer vacuum gap thermionic power conversion device with CsI coated graphite electrodes

AUTHOR(S)
Jeong Ik Lee; Yong Hoon Jeong; Hee-Cheon No; Hannebauer, Rob; Sang-Keun Yoo
PUB. DATE
November 2009
SOURCE
Applied Physics Letters;11/30/2009, Vol. 95 Issue 22, p223107
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Cesium iodide (CsI) coated graphite is a good candidate for an electrode material of a thermionic power generation device due to its low work function. In this letter, a thermionic device with a nanometer-scale vacuum gap between a CsI coated graphite emitter and a collector will be investigated while considering various gap-size effects. It is shown that a nanometer scale gap-size not only affects electron transport but also photon transport, and that all of these effects must be taken into account when estimating the device’s performance.
ACCESSION #
45610502

 

Related Articles

  • Thermionic Converters Based on Nanostructured Carbon Materials. Koeck, Franz A. M.; Yunyu Wang; Nemanich, Robert J. // AIP Conference Proceedings;2006, Vol. 813 Issue 1, p607 

    Thermionic energy converters are based on electron emission through thermal excitation and collection where the thermal energy is directly converted into electrical power. Conventional thermionic energy converters based on emission from planar metal emitters have been limited due to space...

  • Thermal and Electrical Characteristics of Thermionic Converters under Combined Electrode Heating. Dudarev, Yu. I.; Ermilov, B. I. // Technical Physics;Sep2004, Vol. 49 Issue 9, p1221 

    An experimental procedure for studying the thermal and electric characteristics of a single-element thermionic converter under combined heating of the electrodes is proposed (direct heating by thermal radiation from an electric heater plus heating of the emitter by the reverse currents of the...

  • Efficiency of Thermionic and Thermoelectric Converters. Gerstenmaier, York Christian; Wachutka, Gerhard // AIP Conference Proceedings;2007, Vol. 890 Issue 1, p349 

    Thermoelectric and thermionic converters — also in micro- and nano-meter design — are considered for power generation and cooling applications. The potential of thermionic vacuum gap converters is investigated precisely by a new advanced theory with inclusion of backward currents...

  • thermionic tube.  // Hutchinson Dictionary of Scientific Biography;2005, p1 

    Evacuated metal or glass container enclosing a system of electrodes. The cathode emits electrons when heated, and these are attracted to a positively charged anode. Perforated grid electrodes within the tube can be used to control the electron current.

  • Experimental investigation of a thermionic converter with Molybdenum electrodes for low temperature applications. Momozaki, Yoichi; El-Genk, Mohamed S. // AIP Conference Proceedings;2001, Vol. 552 Issue 1, p1142 

    Experiments performed, which investigated the suitability of Molybdenum electrodes, planar converter with 0.5-mm inter-electrode gap for low temperarure, energy conversion applications. Results confirmed that for T[sub E] < 1773 K, the performance of the present converter is superior to that...

  • Effects of Collector Temperature on the Performance of Grooved Electrode Thermionic Converters. Momozaki, Yoichi; El-Genk, Mohamed S. // AIP Conference Proceedings;2003, Vol. 654 Issue 1, p757 

    Experiments are conducted to compare the performance of the smooth electrodes, grooved emitter, and grooved collector converters at the same emitter and collector temperatures. The focus of the experiments is to investigate the effects of collector temperature on the performance of grooved...

  • A thermionic energy converter with an electrolytically etched tungsten emitter. Gubbels, G. H. M.; Metselaar, R. // Journal of Applied Physics;8/15/1990, Vol. 68 Issue 4, p1883 

    Presents a study that examined the use of a thermionic energy converter with an electrolytically etched tungsten emitter. Background on electrode materials; Analysis of the bare work function of the tungsten emitter; Assessment of the dependence of the I-V characteristics on the cesium...

  • A thermionic energy converter with a molybdenum-alumina cermet emitter. Gubbels, G. H. M.; Wolff, L. R.; Metselaar, R. // Journal of Applied Physics;12/1/1990, Vol. 68 Issue 11, p5856 

    Presents a study on the properties of cermets as electrode materials for thermionic energy converters (TEC). Description of a TEC; Facilitation of the commercial application of combustion heated TEC; Isothermal section of the phase diagram of the molybdenum-aluminum-oxygen system; Overall...

  • Ab initio study of the effects of thin CsI coatings on the work function of graphite cathodes. Vlahos, Vasilios; Booske, John H.; Morgan, Dane // Applied Physics Letters;10/1/2007, Vol. 91 Issue 14, p144102 

    Cesium-iodide (CsI)-coated graphite cathodes are promising electron sources for high power microwave generators, but the mechanism driving the improved emission is not well understood. Therefore, an ab initio modeling investigation on the effects of thin CsI coatings on graphite has been carried...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics