Reduced graphene oxide-wrapped La0·8Sr0·2MnO3 microspheres sensing electrode for highly sensitive nitrite detection

Cheng, Chao; Zhang, Yixin; Chen, Hongyu; Chen, Xin Yi; Lü, Miao

doi:10.1016/j.talanta.2023.124644

Cited by 9 publications

(6 citation statements)

References 54 publications

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“…The CPE in the sensor provides more adsorption sites with rich porous structures. According to the previous work [ 15 , 36 , 37 , 38 , 39 ], we deduced that the single-electron rather than the single-proton mechanism of NO 2 − oxidation at Ag-CeO 2 @C was the following: Under the prerequisite of pH < 6.8, Ag-CeO 2 is reduced, which improves the electron transfer, and NO 2 − is oxidized to NO 3 − . Nitrite ions can combine with protons to form nitrite (1); meanwhile, nitrite accepts protons to generate nitrate and nitric oxide (2) [ 15 ].…”

Section: Resultsmentioning

confidence: 84%

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Ag-CeO2 Based on Electrochemical Sensor for High-Efficient On-Site Detection of Nitrite in Aquaculture Water and Beverages

Zhao,

Zhang,

Zhou

et al. 2024

Molecules

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Nitrite is one of the most common nitrogenous compounds, which is not only an important indicator of aquaculture water but also widely used as a food additive. Its potential toxicity poses a huge threat to aquatic products and human health. Therefore, it is important to develop a convenient and rapid sensor for the high-efficient onsite detection of nitrite. In this work, a novel electrochemical sensor was developed for the qualitative and quantitative analysis of nitrite. The developed nitrite electrochemical detection system is easily applied in onsite detection. The electrochemical working electrode was constructed based on the combination of Ag-CeO2 and conductive carbon paste (CPE) with excellent electrocatalysis activity and rapid electron transfer ability. By the application of the developed system and under the optimal conditions, the linear range was from 40.0 μM to 500.0 μM, and the detection limit was reduced to 4.3 μM. The recovery was between 92.1% and 108.1%, and the relative standard deviations (RSDs) were 0.49%~9.31%. The sensor exhibited superior reproducibility, high stability sensitivity, and anti-interference ability, confirming its effectiveness for nitrite analysis. Finally, the developed electrochemical sensor was successfully applied to detect nitrite in beverages and aquaculture water samples, indicating that this approach has great potential in onsite food testing and environmental monitoring.

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Section: Resultsmentioning

confidence: 84%

“…Then, NO 2 intermediates were generated (4) [ 36 , 37 ]. After that, NO 2 − was converted to NO 3 − with H 2 O under the disproportionated ratio (5, 6) [ 38 , 39 ]. When pH > 6.8, nitrite is difficult to acidically oxidize due to the lack of protons.…”

Section: Resultsmentioning

confidence: 99%

Ag-CeO2 Based on Electrochemical Sensor for High-Efficient On-Site Detection of Nitrite in Aquaculture Water and Beverages

Zhao,

Zhang,

Zhou

et al. 2024

Molecules

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“…The detection of nitrite (NO 2 − ) 34 was selected to test the proposed design, utilizing reduced graphene oxide-wrapped La 0.8 Sr 0.2 MnO 3 as the sensing material. 35 For various real water bodies, this strategy achieved a relative error lower than 9.6%, compared to the measurement results obtained by the standard Griess method, and proved to be significantly more accurate than the commonly used laboratory calibration method. This SCD strategy is anticipated to be adaptable to other electrochemical targets simply by employing an appropriate sensing material.…”

mentioning

confidence: 86%

“…La 0.8 Sr 0.2 MnO 3 (LSM)/reduced graphene oxide (rGO) sensing material has been verified for sensitive and selective nitrite sensing in our previous publication and was chosen to verify this strategy. 35 Detailed synthesis processes of the LSM/rGO composite have been described in the Supporting Information. A total of 10 mg of LSM/ rGO composites and 2 μL of Nafion solution (5 wt %, Sigma-Aldrich, USA) were evenly dispersed in 10 mL of ethanol.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…To achieve accurate electrochemical sensing in the field, we propose a simultaneous calibration and detection (SCD) strategy, which is composed of a linear regression algorithm and the corresponding electrochemical sensor with a series of identical sensing cells, which can mitigate the aforementioned interferences through linear calibration during the detection of the targeted contaminant in complex water. The detection of nitrite (NO 2 – ) was selected to test the proposed design, utilizing reduced graphene oxide-wrapped La 0.8 Sr 0.2 MnO 3 as the sensing material . For various real water bodies, this strategy achieved a relative error lower than 9.6%, compared to the measurement results obtained by the standard Griess method, and proved to be significantly more accurate than the commonly used laboratory calibration method.…”

mentioning

confidence: 99%

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A Simultaneous Calibration and Detection Strategy for Electrochemical Sensing with High Accuracy in Complex Water

Cheng,

Chen,

Chen

et al. 2024

ACS Sens.

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The electrochemical sensors loaded with nanomaterials have exhibited a great sensitivity. Nonetheless, the field detection for complex waterbodies can be affected by cross-sensitivity, environmental conditions such as temperature and pH value, as well as the relatively low reproducibility and stability of nanomaterials. In this paper, a simultaneous calibration and detection (SCD) strategy is proposed to introduce a simultaneous and precise calibration during field electrochemical detection, which is composed of a linear regression algorithm and a compact electrochemical sensor containing a series of identical sensing cells. This design can significantly mitigate cross-sensitivity in complex water and the inconsistency of sensing materials. Applied in the NO 2 − detection for practical waterbodies, the SCD strategy has exhibited a relative error of no more than 9.6% for the measurement compared to the results obtained by the standard Griess method and higher accuracy than the normal electrochemical method. The SCD strategy is independent of sensing materials, indicating that it can be widely applied to various detections by just switching the corresponding sensing material.

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Non-precious metal-modified sensors for nitrite detection

Yang,

Zhang,

Zhang

et al. 2023

Ionics

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Reduced graphene oxide-wrapped La0·8Sr0·2MnO3 microspheres sensing electrode for highly sensitive nitrite detection

Cited by 9 publications

References 54 publications

Ag-CeO2 Based on Electrochemical Sensor for High-Efficient On-Site Detection of Nitrite in Aquaculture Water and Beverages

Ag-CeO2 Based on Electrochemical Sensor for High-Efficient On-Site Detection of Nitrite in Aquaculture Water and Beverages

A Simultaneous Calibration and Detection Strategy for Electrochemical Sensing with High Accuracy in Complex Water

Non-precious metal-modified sensors for nitrite detection

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