Review: Measurement of partial electrical conductivities and transport numbers of mixed ionic-electronic conducting oxides

Tuning proton kinetics in BaCo0.4Fe0.4Zr0.2–XYXO3–δ triple ionic-electronic conductors via aliovalent substitution

“…To better emulate conditions in protonic ceramic fuel cells, another conductivity relaxation experiment was conducted to probe the effect of water incorporation on oxygen surface exchange. In dry, oxidizing conditions, rapid switching of oxygen partial pressure changes the total conductivity according to eqn (11). Increasing Y concentration generally increases k O,chem and decreases D O,chem , consistent with our previous study.…”

“…For TIEC systems, the hydrogen permeation flux is estimated using the following: 11,45 where t H , t O , and t e are the transport numbers of protons, oxygen ions, and electrons, respectively, σ tot is the total conductivity, R is the universal gas constant, T is temperature, F is the Faraday constant, and L is the thickness of the membrane. Given the conditions of the experiment, the O 2 gradient can be assumed to be negligible, and the equation is reduced to:…”

“…9,10 Numerous methods have been employed to study bulk proton mobility in materials with protonic, oxygen ionic, and electronic conductivity. 11 Indirect methods such as proton uptake measurements via thermogravimetric analysis [12][13][14] and proton exchange measurements via electrical conductivity relaxation (ECR) [15][16][17] have been used to estimate proton mobility. In predominantly ionic-conducting materials, such as BaCeO 3 -BaZrO 3 -based solid solutions, total conductivity through electrochemical impedance spectroscopy (EIS) and electromotive force measurements (EMF) across varying atmospheres can directly probe the conductivities of protons, oxygen ions, and electrons.…”

Toward Superb Perovskite Oxide Electrocatalysts: Engineering of Coupled Nanocomposites

“…Electrochemical devices, such as fuel cells that directly convert chemical energy (of fuels) to electricity, and electrolyzers that deliver green hydrogen through water splitting, have attracted significant attention in the past decades because of their highly efficient clean power generation and conversion. [ 1–8 ] To pursue economic but productive performances, the discovery and design of low‐cost electrocatalysts with high catalytic activity and excellent stability is a hot topic. [ 9–16 ]…”

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vert chemical energy (of fuels) to electricity, and electrolyzers that deliver green hydrogen through water splitting, have attracted significant attention in the past decades because of their highly efficient clean power generation and conversion. [1][2][3][4][5][6][7][8] To pursue economic but productive performances, the discovery and design of low-cost electrocatalysts with high catalytic activity and excellent stability is a hot topic. [9][10][11][12][13][14][15][16] Among various materials, perovskitetype oxides with a nominal formula of ABO 3 are an outstanding candidate.

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