Determination of the p-electronic conduction parameter of NASICON by potentiometric measurements
Determination of the p-electronic conduction parameter of NASICON by potentiometric measurements
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通过电位测量测定 NASICON 的 p 电子传导参数
DOI：
10.1016/j.electacta.2004.02.022
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发表时间：
2004
影响因子：
6.6
通讯作者：
F. Figueiredo
中科院分区：
文献类型：
--
作者：
K. Shqau;H. Näfe;F. Aldinger;F. Figueiredo
使用原电池：【配方：NASICON的p-电子传导参数aNa ″表征为钠活度aNa″和温度的函数。为此，通过改变CO2-O2气体混合物的组成来评估aNa″连续变化的等温电压响应。在所研究的温度范围内（300-620°C），它认为：[公式：见正文] [公式：见正文]因此，在以NASICON作为固体电解质的CO2传感器中，测量电极处的钠活性在电解质的离子域之外。这与大多数关于这种气体传感器的行为的文献报道明显矛盾，但证实了以前关于Na-β-氧化铝在可比条件下的电子导电性程度的发现。
Using the galvanic cell: [Formula: see text] the p-electronic conduction parameter a⊕of NASICON was characterized as a function of the sodium activity aNa″and the temperature. For that purpose, the isothermal voltage response to successive variations of aNa″by changing the composition of the CO2–O2gas mixture was evaluated by a non-linear regression procedure. Within the temperature range under investigation (300–620°C) it holds that: [Formula: see text] [Formula: see text] Thus, in a CO2sensor with NASICON as solid electrolyte the sodium activity prevailing at the measuring electrode is outside the ionic domain of the electrolyte. This is in apparent contradiction to most of the literature reports on the behavior of such gas sensors, but confirms previous findings on the extent of the electronic conductivity in Na–beta-alumina under comparable conditions.