Elucidating the hydrogen adsorption kinetics on Pt/TiO2/Pt based highly efficient sensors

被引：6

作者：

Haidry, Azhar Ali ^{[1
,2
,3
]}

Ji, Yinwen ^{[1
,2
]}

Raza, Adil ^{[1
]}

Zhu, Hao ^{[1
,2
]}

Zavabeti, Ali ^{[4
]}

Saruhan, Bilge ^{[5
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 211100, Peoples R China

[2] Minist Ind & Informat Technol, Key Lab Mat Preparat & Protect Harsh Environm, Nanjing 211100, Peoples R China

[3] Univ Okara, Dept Phys, Okara 56300, Pakistan

[4] Univ Melbourne, Dept Chem Engn, Parkville, Vic 3010, Australia

[5] Inst Mat Res, German Aerosp Ctr DLR, D-51147 Cologne, Germany

来源：

MATERIALS RESEARCH BULLETIN | 2023年 / 167卷

基金：

中国国家自然科学基金;

关键词：

Adsorption; Hydrogen sensing; Reaction kinetics; TiO2; Second-order rate equation; SENSING PERFORMANCE; LOW-TEMPERATURE; FAST-RESPONSE; SORPTION; REMOVAL; INTERFACE; MECHANISM; HUMIDITY; ORDER; MODEL;

D O I：

10.1016/j.materresbull.2023.112415

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The adsorption of a gas and its concomitant diffusion onto the semiconductor surface are the primary factors to determine the response of a gas sensor. Despite intensive sensor research, understanding the gas adsorption reaction kinetics has been protractedly ignored. The current study is riveted on elucidating the adsorption kinetics of hydrogen gas onto the Pt/TiO2/Pt structured sensors. It is demonstrated that the prepared Pt/TiO2/Pt structure features excellent hydrogen sensing performances (sensor response -104 at room temperature) increased to -106 at 100 & DEG;C toward 10,000 ppm H2. More importantly, the adsorption kinetics are investigated by verifying the experimental results against various theoretical models. It is found that Ho's pseudo-secondorder model (H-PSO) fits well with the experimental results having correlation factors higher than 0.99 for almost all gas concentrations and operating temperatures. Eventually, the H2 Adsorption kinetics onto Pt/TiO2/ Pt structure are meticulously analyzed based on the correlation between experimental results and theory.

引用

页数：11

共 45 条

[1] Anodized nanoporous WO3 Schottky contact structures for hydrogen and ethanol sensing [J].