Citation: WU Na, SHEN Yuan, WANG Li, SONG Yong-Hai. On-Off Ratiometric Electrochemical Sensor for Ascorbic Acid Based on Three-dimensional Kenaf Stem Porous Carbon/Thinion Integrated Electrode[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(12): 1650-1657. doi: 10.19756/j.issn.0253-3820.201419 shu

On-Off Ratiometric Electrochemical Sensor for Ascorbic Acid Based on Three-dimensional Kenaf Stem Porous Carbon/Thinion Integrated Electrode

Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China

Corresponding author: SONG Yong-Hai, yhsonggroup@hotmail.com
Received Date: 18 July 2020
Revised Date: 21 September 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21765009, 21964010, 21465014, 21665012).

A ratiometric ascorbic acid (AA) electrochemical sensor was directly constructed by implanting thionine (Thi) on three-dimensional porous carbon derived from Kenaf stem (3D-KSC). The treated 3D-KSC and 3D-KSC/Thi were characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). There were some micropores and defects situated in the wall of 3D-KSC's hole, which provided a large surface area and good catalytic activity. Owing to these pore defects, Thi molecules could adhere to its interior firmly. The 3D-KSC/Thi electrode had a catalytic effect against AA at 0.015 V ("on"), while the oxidation peak of Thi at -0.24 V did not change with the increase of concentration of AA ("off"), therefore, a ratiometric AA electrochemical sensor was designed by using the ratio of peak current density of these two oxidation peaks. The "on-off" ratiometric type of AA electrochemical sensor had high selectivity, wide linear detection (from 18.2 μmol/L to 8.0 mmol/L), low detection limit (6.0 μmol/L), and showed good potential application prospect.
- Porous carbon,
- Thionine,
- Ratiometric electrochemical sensor,
- Ascorbic acid
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