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. 2022 Mar 1;13:1098. doi: 10.1038/s41467-022-28740-8

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Fig. 5 — a EPR spectra for 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-e⁻ showing the reactive species. b In situ diffused reflectance infrared Fourier transform spectroscopy (DRIFTS) revealing the principal reactants and products within the NO₃⁻RR on BaO_NCs-TNS. c Gibbs free-energy diagram of the reaction coordinates. Steps marked red and purple are the potential side reactions of NO₃⁻RR on BaO_NCs-TNS.