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A fiber-optic sensor for in-situ detection of methanol production rate in photocatalytic CO2 reduction reaction

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2025, 35(3), pp.1337~1347
  • DOI : 10.1007/s42823-025-00876-9
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : October 14, 2024
  • Accepted : January 25, 2025
  • Published : June 5, 2025

Shihui Wang 1 Yuyao Lei 1 Chao He 1 Junhe Miao 1 Yang Liu 1 Quanhua Xie 1 Karimi‑Maleh Hassan 1 Nianbing Zhong 1

1Chongqing Key Laboratory of Modern Photoelectric Detection Technology and Instrument

Accredited

ABSTRACT

In the pursuit of achieving in-situ real-time detection of methanol production rate during the photocatalytic reduction of CO2, we developed a methanol sensor using a copolymer-coated fiber Bragg gratings. The theoretical model of methanol measurement by sensor was established. The effect of methanol-selective sensitive material and its thickness on the performance of the sensor were investigated. Humidity and temperature interference to sensor measurements was compensated. Furthermore, TiO2 photocatalyst was prepared and the photocatalytic reactor was constructed. The methanol production rate in the photocatalytic CO2 reduction process was monitored by the prepared sensor in-situ. The results highlight that the fiber Bragg grating methanol sensor with 600 nm-thick poly(N-isopropylacrylamide)/polymethyl-methacrylate coating showed a high sensitivity, lower limit of detection, fast response and recovery speed, and high selectivity. The methanol generation rate of TiO2 photocatalytic reduction of CO2 measured by gas chromatograph and prepared fiber Bragg grating methanol sensor was 1.42 and 1.53 μmol/g-cat·h, respectively, the error of the two detection methods was 7.86%. This highlights the efficacy of the developed fiber Bragg grating methanol sensor for real-time in-situ detection of the methanol production rate during the photocatalytic reduction of CO2.

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