Mechanism of hydrogen gas-sensing at low temperatures using Rh/TiO2 systems

G. Munuera, A.R. González-Elipe, A. Muñoz, A. Fernández, J. Soria, J. Conesa, J. Sanz
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引用次数: 27

Abstract

The effects of H2 adsorption on the conductivity of pressed pellets of a Rh/TiO2 polycrystalline material are studied as a function of the degree of hydroxylation and reduction of the TiO2 support.

The process involved in the enhancement of conductivity induced by the adsorption of H2 at 295 K is examined in detail with the aid of different techniques including e.p.r., n.m.r. and i.r. spectroscopies. The results show that this material can be an efficient sensor for H2 at 295 K in ambient atmosphere. A mechanism is proposed for the behaviour of this H2 sensor, which involves electron and proton transfer from the Rh metal to the TiO2 semiconductor in the presence of H2.

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Rh/TiO2体系低温氢气感测机理研究
研究了H2吸附对Rh/TiO2多晶材料压球电导率的影响与羟基化程度和TiO2载体还原度的关系。利用不同的技术,包括e.p.r, n.m.r.和i.r.光谱,详细研究了295k下H2吸附诱导电导率增强的过程。结果表明,该材料可以在295 K的环境气氛中作为H2的有效传感器。提出了H2传感器的行为机制,该机制涉及在H2存在下电子和质子从Rh金属转移到TiO2半导体。
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