Hydrogen permeation measurements of Pd and Pd–Cu membranes using dynamic pressure difference method

Asymmetric Lanthanum Doped Ceria Membrane with Proton Conductive and Hydrogen Separation Capability for Solid Oxide Fuel Cell

“…When comparing the obtained result to some of the previously studied results, Zhu et al [14] and Fang et al [16] had reported a hydrogen permeation flux of approximately 1.0 × 10 -4 mol·m -2 ·s -1 at a hydrogen partial pressure of 20.3 kPa with 3 kPa of H2O partial pressure, which is slightly lower than what we observed, 3.9 × 10 -4 mol·m -2 ·s -1 at 20.3 kPa of hydrogen partial pressure without H2O. In addition, when comparing this novel asymmetric membrane to the usual hydrogen separation membrane, silica and palladium membrane shows approximately 10 and 100 times higher in hydrogen gas permeation, respectively [23,24]. The highest value was observed by Khatib et al [25] are 3.6 × 10 -2 and 2.5 × 10 -1 mol·m -2 ·s -1 for silica and palladium membranes supported by porous alumina, respectively.…”

Comparison of Cu and Pt point-contact electrodes on proton conducting BaZr0.7Ce0.2Y0.1O3−

“…The hydrogen oxidation reaction (HOR) is fundamental to the operation of many electrochemical devices, and is thought to occur primarily in a small region at the three phase boundary (3pb) of the gas-metal-electrolyte interface. It is also hypothesized that in the case of an electrode material with high hydrogen permeability, such as Pd or a Cu-Pd alloy [82,83], this may also occur at the two-phase metal-electrolyte boundary (2pb). Fig.…”

Enhanced hydrogen production from thermochemical processes

“…87 The difference in lattice parameter (0.3895 nm for the α phase and 0.410 nm for the β phase) causes distortions which can lead to cracks, defects or pinholes in the film. 107 With the purpose of preventing phase transition and relieving embrittlement, palladium is often alloyed with other metals such as Ag, [107][108][109] Cu, [110][111][112][113][114] Au 115 or Ru. 51,[116][117][118] Alloying was found to reduce the critical temperature for the α↔β phase transition.…”