Electrocatalytic effects in gas sensors based on low-temperature superprotonics
Electrocatalytic effects in gas sensors based on low-temperature superprotonics
复制标题
基于低温超质子学的气体传感器中的电催化效应
DOI：
10.1016/j.snb.2004.05.053
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发表时间：
2005
影响因子：
8.4
通讯作者：
S. Vassiliev
中科院分区：
文献类型：
--
作者：
I. Treglazov;L. Leonova;Y. Dobrovolsky;A. Ryabov;A. Vakulenko;S. Vassiliev
研究了PbO 2/H4 SiW 12 O 40·nH 2 O或MexH 3 − xPW 12 O 40·nH 2 O（Me = Li，Na，K，Rb，NH 4，x = 0，2，3）杂多化合物/Pt电化学电池在H2-Ar和H2-空气气氛中的低温氢敏特性。所有研究的杂多化合物被证明是在涉及氢的反应中的电催化活性。具有不同电解质的传感器的电动势对氢浓度的依赖性（相对于惰性介质中的标准氢电势或相对于含氧介质中的空气电势计算）对于所使用的所有电解质是相同的。相反，传感器的电动势弛豫的速率取决于氢的脉冲进入后，在阴离子性质（从12-硅钨酸的化合物系列中增加到12-磷钨酸化合物）和阳离子性质，随着碱金属阳离子系列中的阳离子尺寸的增加而增加。在此基础上，我们提出了一种电化学固态传感器，它可以测量10 - 2 ~ 5vol.%的氢气浓度在惰性气体和空气中，在−60至+60 ° C的温度范围内不保持恒温和流体静力学状态。
The behavior of low-temperature hydrogen sensors based on the PbO2/heteropoly compound/Pt electrochemical cells, where heteropoly compound is H4SiW12O40·nH2O or MexH3−xPW12O40·nH2O (Me = Li, Na, K, Rb, NH4, x = 0, 2, 3), in H2–Ar and H2–air atmospheres was studied. All heteropoly compounds studied were shown to be electrocatalytically active in reactions involving hydrogen. The dependences of the emf of the sensors with different electrolytes on the hydrogen concentration (calculated relatively to the standard hydrogen potential in inert media or to the air potential in oxygen-containing media) are identical for all the electrolytes used. The rate of emf relaxation of the sensors upon the impulse admission of hydrogen depends, on the contrary, on both the anion nature (increases in the series from compounds of 12-silicotungstic acid to 12-phosphotungstic acid compounds) and the cation nature, increasing with an increase in the cation size in the series of alkaline metal cations. Based on our studies, we proposed the electrochemical solid-state sensor, which can determine hydrogen concentrations from 10−2to 5vol.% in inert gases and air without maintaining constant temperature and hydrostatic regimes in the temperature interval from −60 to +60°C.