A trace ppb-level electrochemical H2S sensor based on ultrathin Pt nanotubes

Peng Zuo; Ruixin Wang; Fenghua Li; Fengxia Wu; Guobao Xu; Wenxin Niu

doi:10.1016/j.talanta.2021.122539

A trace ppb-level electrochemical H₂S sensor based on ultrathin Pt nanotubes

Talanta. 2021 Oct 1:233:122539. doi: 10.1016/j.talanta.2021.122539. Epub 2021 May 20.

Authors

Peng Zuo¹, Ruixin Wang², Fenghua Li³, Fengxia Wu⁴, Guobao Xu⁵, Wenxin Niu⁶

Affiliations

¹ School of Chemical Engineering and Technology, North University of China, Taiyuan, Shanxi, 030051, China; State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin, 130022, China.
² School of Chemical Engineering and Technology, North University of China, Taiyuan, Shanxi, 030051, China. Electronic address: zbdxwrx@nuc.edu.cn.
³ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin, 130022, China. Electronic address: fhli@ciac.ac.cn.
⁴ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin, 130022, China.
⁵ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin, 130022, China; University of Science and Technology of China, Hefei, 230026, China.
⁶ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin, 130022, China; University of Science and Technology of China, Hefei, 230026, China. Electronic address: niuwx@ciac.ac.cn.

PMID: 34215042
DOI: 10.1016/j.talanta.2021.122539

Abstract

An amperometric sensor has been developed with high sensitivity for real-time measurement of H₂S gas at room temperature (25 °C ± 2 °C). In order to enhance the utilization of platinum and improve its catalytic performance, an ultrathin and one-dimensional (1D) Pt nanotubes (Pt NTs, ~3.5 nm in wall thickness) were designed and used as sensing electrode materials. Different concentrations of H₂S gas were tested to evaluate the sensitivity of the sensor and to obtain the relationship between the electricity response signal and H₂S gas concentration. At room temperature, the sensor based on Pt NTs shows better sensing performance than that based on Pt nanoparticles, which is mainly attributed to two factors, namely, the inherent characteristic of the hollow 1D Pt NTs. The Pt NTs-based sensor shows a detection limit as low as 0.025 ppb, which are the lowest among H₂S gas sensors reported in the literatures. The response and recovery times are 0.75 s and 0.86 s for 0.8 ppb H₂S, respectively. In addition, the sensor shows a wide range (100 ppm-0.025 ppb), high selectivity compared to other gases (including CO, NH₃, CH₂O, NO and NO₂), good reproducibility, and satisfactory long-term stability. Thus, the ultrathin Pt NTs-based gas sensor would be a great potential to the real-time and online monitoring of the trace ppb-level H₂S gas at room temperature.

Keywords: Amperometric gas sensor; H(2)S; Room temperature; Trace ppb-level; Ultrathin Pt nanotubes.

MeSH terms

Electrodes
Gases
Nanotubes*
Platinum
Reproducibility of Results

Substances

Gases
Platinum