A new electrolyte based on Tm3+-doped δ-Bi2O3-type phase with enhanced conductivity

Thermochemically stable ceramic composite membranes based on Bi2O3 for oxygen separation with high permeability

“…[27][28][29] In comparison to CeO 2 and ZrO 2 based oxide ion conductors, d-Bi 2 O 3 shows a higher oxide ion conductivity 30 and the high temperature phase can be stabilized at lower temperatures by doping with lanthanide elements. [31][32][33][34] Previous studies have focused on composite membranes based on doped Bi 2 O 3 mixed with noble metals and relatively high oxygen fluxes were obtained. [35][36][37] However, these cermet membranes exhibited high and unsuitable thermal expansion, and the use of noble metals may be an issue for their applicability due to the material cost.…”

“…Among the lanthanide dopants for Bi 2 O 3 , thulium was chosen due to its suitable ionic radius for attaining the cubic d-Bi 2 O 3 phase which exhibits high phase stability at lower temperatures and high oxide ion conductivity. 34 The composite pellet membranes were synthesized by the solid-state reaction method. Bi 2 O 3 (99.9%, Sigma Aldrich) and 20 molar percent of Tm 2 O 3 (99.9%, Sigma Aldrich) were weighed and mixed in an agate mortar.…”

Photocatalytic Activity of Bi2O3 Enhanced by the Addition of Ce3+/Ce4+ Synthesized by Ethylene Glycol‐assisted Solvothermal Method

“…The δ‐Bi 2 O 3 phase usually transforms into the β‐Bi 2 O 3 phase at 650 °C and γ‐Bi 2 O 3 phase at 639 °C with cooling. Recently, many investigations have been published on extending the stability of the cubic δ‐phased Bi 2 O 3 to room temperature via cations doping . Several works on the stability of the δ‐Bi 2 O 3 by introduce of high‐valence cations, such as Re 7+ , Mo 6+ , Ta 5+ , Nb 5+ and V 5+ , have been well documented for photocatalysis purposes.…”

Investigation of Structural and Electrical Properties of (Bi2O3)1-x-y(CeO2)x(Eu2O3)y Electrolytes for Solid Oxide Fuel Cells

“…The face-centered cubic (fcc) δ-Bi 2 O 3 phase has stable fluoride type structure and exhibits the highest oxygen ionic conductivity among all bismuth oxide phases in SOFCs [15,16]. The tetragonal β-Bi 2 O 3 phase and the body centered cubic (bcc) γ-Bi 2 O 3 phase metastable structure show good oxygen ionic conductivity property [17]. Therefore, in order to preserve high conductivity properties of δ-Bi 2 O 3 , β-Bi 2 O 3 and γ-Bi 2 O 3 phases, bismuth oxide based electrolytes can be more stabilized by addition of rare earth elements such as Ho, Dy, Er, Tb, Tm, Eu, and Ce into pure Bi 2 O 3 [18][19][20][21].…”