Sensing nitrite by iron-nitrogen-carbon oxygen reduction electrocatalyst
Ficca V.C.A. Santoro C. Marsili E. da Silva Freitas W. Serov A. Atanassov P. Mecheri B.
10 January 2022Elsevier Ltd
Electrochimica Acta
2022#402
Nitrite contamination of groundwater is a concerning consequence of anthropic activity. The electrochemical detection of nitrite in water is based on direct electrocatalytic oxidation of nitrite over modified electrodes. However, drawbacks associated to the high oxidation potential required, oxide layer formation, and O2 interference are present. Considering the recent availability and low cost of platinum-group-metal-free (PGM-free) electrocatalyst, a new sensing strategy is presented based on this class of material commonly used for oxygen reduction reaction (ORR) in fuel cells. The working principle relies on the inhibition of ORR active sites of PGM-free caused by the interaction with nitrite. The parameters of interest for the ORR inhibition were determined through cyclic voltammetry and chronopotentiometry using a rotating disk electrode to minimize oxygen diffusion limitations at the working electrode. The linearity range of the sensor was 1–100 µM, with a sensitivity of 3.4 mV µM−1, and a limit of detection (LOD) in the sub-µM range. Based on the optimization of the electrocatalyst thickness and its reusability, the cost of 1 USD for ∼2000 tests was calculated.
Biosensor , Nitrite detection , Oxygen reduction reaction , Platinum group metal-free , Rotating disk electrode
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Department of Chemical Science and Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica, Rome, 00133, Italy
Department of Material Science, University of Milan Bicocca, U5 Via Cozzi 55, Milan, 20125, Italy
Department of Chemical and Materials Engineering, Nazarbayev University, 53 Kabanbay Batyr Avenue, Nur-Sultan, 010000, Kazakhstan
Oak Ridge National Laboratory, Electrification and Energy Infrastructures Division, Oak Ridge, 37831, TN, United States
Chemical and Biomolecular Engineering, National Fuel Cell Research Center, University of California, Irvine, 92697, CA, United States
Department of Chemical Science and Technologies
Department of Material Science
Department of Chemical and Materials Engineering
Oak Ridge National Laboratory
Chemical and Biomolecular Engineering
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