Rahman, Evandi Lee, Jiho Lim, Seung Ji Son, Aseom Han, Jiyun Cho, Kangwoo Hong, Seok Won 2024-01-19T08:31:54Z 2024-01-19T08:31:54Z 2023-10-29 2023-10 1944-8244 https://pubs.kist.re.kr/handle/201004/113202 We synthesized low-cost cathodes for use in the electrochemical NO3- reduction reaction (NO3RR) via the simple reconstruction of AISI 420 stainless steel (SS). Thermochemical treatment of the SS in oxalic acid generated iron oxalate (FeC2O4) microrods (BL-SS), with further anodization affording Cr-doped Fe2O3 (R-SS) or FeC2O4 (G-SS). G-SS displayed supreme N-2 selectivity during galvanostatic electrolysis at circumneutral pH. Electroanalysis and descriptor/scavenger analysis indicated that Fe sites were the primary active sites of NO3- adsorption, with C2O42- as the H-binding sites. The C2O42- ligands and Cr dopants altered the electronic structures of the Fe sites. A parametric study of the current density, pH, [NO3-](0), and [Cl-](0) indicated an Eley-Rideal N-2 generation mechanism, with NO2- as an intermediate. Cl- elevated the N-2 selectivity but reduced the NO3RR efficiency. To demonstrate the practical applicability of G-SS with a proposed regeneration strategy, its durability was examined in synthetic and real wastewater matrices. Compared with that in synthetic wastewater, G-SS displayed more stable performance in real wastewater owing to the natural buffering capacity at the cathode, which reduced the corrosion rate. Cr-doped FeC2O4 is viable for use in the low-cost, efficient electrochemical treatment of wastewater containing NO3-. English American Chemical Society Cr-Doped FeC2O4 Microrods Formed Directly on AISI 420 Stainless Steel to Enhance Electrochemical NO3- Reduction to N2 at Circumneutral pH Article 10.1021/acsami.3c07885 1 ACS Applied Materials & Interfaces, v.15, no.39, pp.45799 - 45811 ACS Applied Materials & Interfaces 15 39 45799 45811 N scie scopus 001069258900001 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article NITRATE N-2 generation thermochemical treatment low-cost cathode wastewater treatment cathoderegeneration