Oxygen ion-electron mixed conductor ion electric conductivity measuring method

A technology of ionic conductivity and mixed conductors, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of measurement result influence, measurement result inaccuracy, etc., and achieve the experiment process is simple and easy, the structure is simple, The effect of avoiding errors

Inactive Publication Date: 2008-01-09
SHANGHAI UNIV
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Problems solved by technology

However, the blocking electrode and the sample to be tested are connected together by co-sintering or direct contact with pressure to form an electrochemical cell, which will inevitably cause contact resistance that is difficult to measure accurately, and will be in the two phases of the blocking electrode and the sample to be tested. A certain degree of electrode polarization occurs at the interface, but the current H-W method ignores this part of the interface resistance caused by contact resistance and polarization, resulting in inaccurate measurement results
Especially at high temperature, when the resistance of the sample and the blocking electrode decreases, it will have a greater impact on the measurement results

Method used

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  • Oxygen ion-electron mixed conductor ion electric conductivity measuring method
  • Oxygen ion-electron mixed conductor ion electric conductivity measuring method

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Embodiment 1

[0027] Using this method to measure the oxygen ion-electron mixed conductor Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ (BSCFO) ionic conductivity. Sintering BSCFO powder into L 1 =2.46cm, S=0.58cm 2 Cylindrical samples, the relative density is greater than 92%. 8 mol% yttrium-stabilized zirconia (YSZ) was used as the blocking electrode. The contact surface of the blocking electrode and the mixed conductor is ground and polished, and Pt slurry is coated in the middle to reduce the contact resistance, and then baked at 800°C while applying a certain pressure so that the two can be tightly bonded and connected together to reduce the interface. Possibility of oxygen leak. The other two surfaces of the blocking electrode and the mixed conductor are also coated with Pt slurry and bonded with Pt wire as electrodes and wires, and fired at 800°C for 30 minutes to obtain a smooth Pt electrode with a composition structure of Pt|YSZ-BSCFO|Pt For electrochemical cells, place the sample in ...

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Abstract

The invention relates to measuring method of the oxyanion hyphen electron mixed conductor material ionic conductivity. The mixed conductor is a ceramic material which has oxyanion and electron conduction power. The characteristics of measuring method is that it calculates and gets the ionic conductivity resulting the changes of resistance with the change of needed detection mixed conductor sample geometry after the electron block; because the tangent condition has not any changed before and after of mixed conductor block electrode, not considering the interfacial resistance, block electrode resistance and Pt electrode resistance, avoiding the error from this. The calculating formula of mixed conductor ionic conductivity is sigma i= (L1-L2)/[S*(R-R')].The measuring method of this invention is simply and convenience, the structure of measuring battery is simplify, reducing the factors of importing error.

Description

technical field [0001] The invention relates to a method for measuring the ion conductivity of an oxygen ion-electron mixed conductor material, which is used for measuring the ion conductivity of the mixed conductor material and belongs to the field of functional ceramics. Background technique [0002] A mixed conductor refers to a ceramic material that is capable of conducting both oxygen ions and electrons. At present, mixed conductors mainly include two-phase mixed conductors and single-phase mixed conductors. Two-phase mixed conductor is based on pure ionic conductor, by adding noble metal or electronically conductive oxide, it forms a continuous second phase in the material, and electrons and oxygen ions pass through different phases respectively; single-phase mixed conductor mainly It is a compound of perovskite and its derivative structure. Among them, the perovskite structure mixed conductor is made by doping low-valent metal element ions and transition metal eleme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/02G06F19/00
Inventor 应风晔甄强丁伟中汪承磊
Owner SHANGHAI UNIV
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