2018 年 126 巻 7 号 p. 573-578
We propose Pd–Al2O3 matrix composites as hydrogen separators instead of pure Pd films. The Pd–Al2O3 is lower cost, more stable at higher temperatures as well as higher mechanical strength. The plasma electronic sintering method was effective for preparing 25(30) vol % Pd–Al2O3. The hydrogen permeation flux (JH2) or total electrical conductivity (σt) of the 30 vol % Pd[with polyvinylpyrrolidinone (PVP)]–Al2O3 was one order of magnitude higher than that of the 25 vol % Pd(with PVP)–Al2O3, suggesting percolation conductions of 30 vol % Pd. The 30 vol % Pd(with no PVP)–Al2O3 was further higher than that of the 30 vol % Pd(with PVP)–Al2O3, because of connections among larger Pd grains for the sample with no PVP. The σt or JH2 of the 30 vol % Pd(with no PVP)–Al2O3 was one magnitude lower than that of Pd films.