The electrochemical sensor for methanol detection based on trimetallic PtAuAg nanotubes
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The electrochemical sensor for methanol detection based on trimetallic PtAuAg nanotubes Qianying Qiu1, Nan Jiang1,3,4, Lingna Ge1, Xiaoyan Li2, and Xiaojun Chen1,*
1
College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211800, People’s Republic of China College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211800, People’s Republic of China 3 Inspecting and Testing Centre for Hydrological & Geotechnical Instrument’s Quality, MWR, Nanjing 210012, People’s Republic of China 4 Research Center on Hydrology and Water Resources Monitoring, MWR, Nanjing 210012, People’s Republic of China 2
Received: 12 March 2020
ABSTRACT
Accepted: 21 August 2020
Methanol has attracted broad interests for decades due to its application in various aspects of society, such as the fuel cell and the qualification of alcoholic beverages. Based on Ag nanorods (Ag NRs) prepared by hydrothermal method, PtAuAg nanotubes were obtained through galvanic replacement reaction at 75 °C. Various techniques including scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectrometer and energy-dispersive X-ray spectroscopy were used to characterize the morphology, structure and elemental composition of the NTs. The trimetallic noble metal composition enhanced the poison tolerance of Pt against CO-like intermediates in the process of methanol oxidation. The constructed methanol sensor displayed remarkable catalytic ability toward electrochemical methanol oxidation, offering a good linearity within 0.05–1.8 mM, a high sensitivity of 24.3 mA mM-1 cm-2 and a low detection potential of - 0.2 V. Furthermore, its excellent selectivity and stability revealed great potentials of the methanol sensor in alcoholic beverages evaluation, biological fuel cells and medical industries.
Published online: 28 August 2020
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction Methanol, the simplest monoalcohol, has attracted broad interests for decades due to its application in various aspects of society [1]. It is an important Handling Editor: Pedro Camargo.
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https://doi.org/10.1007/s10853-020-05146-9
chemical raw material for producing glycol, olefins, formaldehyde, pesticides, etc., and also significant for direct methanol fuel cells [2]. However, the misuse of methanol may cause human poisoning and even death, especially in alcoholic beverages [3–5]. As a
15682 result, it is crucial to search proper methods of detecting methanol concentration precisely and quickly [6]. So far, several analytical methods have been reported for methanol detection including spectrophotometry, chromatography, electrochemistry and colorimetry [7, 8]. Compared with those requiring expensive and bulky equipment, the electrochemical method is cheap and portable and also possesses good selectivity and high sensitivity in short response/recovery time [9]. To improve the sensing performance of e
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