Study of Pd Membrane Electrode in Solid Electrolyte Hydrogen (Isotopes) Sensor for Application to Liquid Blankets

Abstract

On-line measurement of hydrogen isotopes in corrosive environments is essential for the development of liquid blanket systems for fusion reactors. In the present study, a Pd membrane electrode for a solid electrolyte hydrogen sensor was developed. An electrode fabricated on the sensor surface was metallurgically analyzed and was found to be a compact layer with much lower porosity than conventional Pt electrodes. This compact electrode can serve as a protective layer against corrosion of the sensor material during measurement. The response and stability of the sensor with the Pd membrane electrode was investigated in an Ar-hydrogen gas mixture environment. The electromotive force of the sensor with the Pd compact electrode agreed with a theoretical calculation, assuming the same three-phase boundary as in the sensor with a porous Pt electrode.

Hydrogen transport through interface between gas bubbling and liquid breeders

“…The size of all the bubbles in the fluids was assumed as uniform. The size was evaluated as that of departure bubbles, which were made at the tip of the nozzle [16], according to the balance between a buoyancy force and a surface tension on the bubble as…”

“…The system pressure in the apparatus was fixed at 1 atm (0.1 MPa). The vessel 2 was installed at downstream of the vessel 1 for the measurement of hydrogen partial pressure in the cover gas with solid electrolyte hydrogen sensor [15,16]. The outer diameter of the sensor was 8 mm.…”

On-line monitoring of oxygen potential and structure of oxide layer in liquid metals by electrochemical methods

“…The oxygen potential in liquid Pb was measured by the solid electrolyte sensor. Intensity (arb.units) Kondo, Adhi, Takahashi, Suzuki, Matsumura, Tanaka, Hishinuma, Sagara and Muroga, Transactions of the JSME (in Japanese), Vol.83, No.847 (2017) (Oshima et al, 2010).センサーシステムは次式のように表される.…”