Rahman, Evandi Hong, Sukhwa Lee, Jaesang Hong, Seok Won Cho, Kangwoo 2024-01-19T09:34:27Z 2024-01-19T09:34:27Z 2023-04-27 2023-04 1944-8244 https://pubs.kist.re.kr/handle/201004/113824 Reactive chlorine-mediated electrochemical water treatment necessitates selective chlorine evolution reaction (ClER) versus parallel oxygen evolution reaction (OER) in mild pH (7-10), with minimal deployments of precious electrocatalysts. This study reports Ni0.33Fe0.67Oy/TiO2 heterojunction anode prepared by a straightforward sol-gel coating with thermal decomposition at 425 degrees C. The ClER current efficiency (CE, 70%) and energy efficiency (2.3 mmol W h-1) were comparable to benchmarking Ir7Ta3Oy/TiO2 at 30 mA cm-2 in 50 mM NaCl solutions with near-neutral pH. Correlations of ClER CE of variable NixFe1-xOy/TiO2 (x: 0.33, 0.8-1) with the flat-band potential and p-band center, as experimental descriptors for surface charge density, nominated the outer TiO2 to be the active ClER center. The underlying Ni0.33Fe0.67Oy, characterized as biphasic NiFe2O4 and NiO, effectively lowered the O binding energy of TiO2 by electronic interaction across the junction. The OER activity of Ni0.33Fe0.67Oy superior to the other Fe-doped Ni oxides suggested that the conductive OER intermediates generated on Ni0.33Fe0.67Oy could also facilitate the ClER as an ohmic contact. Stability tests and NH4+ degradation in synthetic and real wastewater confirmed the feasibility of Ni0.33Fe0.67Oy/TiO2 heterojunction anode for mediated water treatments in mild pH. English American Chemical Society Ni-Fe Oxides/TiO2 Heterojunction Anodes for Reactive Chlorine Generation and Mediated Water Treatment Article 10.1021/acsami.3c00581 1 ACS Applied Materials & Interfaces, v.15, no.14, pp.17867 - 17878 ACS Applied Materials & Interfaces 15 14 17867 17878 N scie scopus 000962326100001 2-s2.0-85151333054 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article OXYGEN EVOLUTION REACTION OXIDE ELECTROCATALYSTS THIN-FILM NANOSHEETS ALKALINE METAL DEPOSITION CATALYSIS NANORODS TIO2 chlorine evolution reaction Ni Fe oxide water treatment TiO2 descriptor