[23p-A306-1~12] 1.4 Energy conversion, storage, resources and environment

[23p-A306-1] Electrochemical and Gaseous-Evaluation of the Thermodynamic Properties of the Pd-H System

〇Ayane Ibii¹, Motoko Isida¹, Makoto Ryo Harada¹, Helmut Takahiro Uchida¹ (1.Tokai Univ.)

Keywords:Hydrogen, Palladium

Several previous studies have been reported on the reaction of palladium-hydrogen (Pd-H) binary systems using gas-phase hydrogen (H2) and electrochemical techniques. Industrially, palladium is expensive and there are aspects that require alternative materials, but academically, it is one of the most representative reaction systems for understanding thermodynamic models of metal-hydrogen systems. In this work, we constructed a unique monitoring system based on hydrogen diffusion permeation using a tubular Pd cell, which can bridge both gas-based and electrochemical methods, to monitor the state of solid solution hydrogen before and after the phase transformation of palladium, both in terms of hydrogen gas partial pressure in the gas phase and EMF potential on the solution side.
-17.05 ± 1.8 kJ/mol H was obtained as the enthalpy of the two-phase plateau region of Pd-H in the temperature range 298-360 K.