Choi, Seung Yo Kim, Seonghun Lee, Kyung Jin Kim, Jin Young Han, Dong Suk Park, Hyunwoong 2024-01-19T19:04:38Z 2024-01-19T19:04:38Z 2021-09-05 2019-09-05 0926-3373 https://pubs.kist.re.kr/handle/201004/119584 We present an off-grid, standalone electrocatalytic H2O2 production reaction (HPR) using carbon nanotubes (CNT) wired to hydrogen-treated TiO2 nanorod (h-TNR) arrays catalyzing the oxidation of As(III) to As(V) under simulated solar light (AM 1.5; 100 mW cm(-2)). Loading CNT onto acid-treated carbon paper (a-CP) significantly enhances the catalytic 2-electron transfer to O-2, leading to a Faradaic efficiency (FE) of similar to 100% for the HPR. To drive the HPR, the 2-electron oxidation of toxic As(III) to less toxic As(V) that accompanies the production of the proton/electron couples is achieved at an FE of > 80% using the h-TNR arrays. The high FEs of the anodic and cathodic reactions are maintained over 10 h when a direct-current voltage of 0.7 V is applied to the h-TNR photoanode and CNT/a-CP cathode pair. The coupling of a mono-Si photovoltaic array that is one-tenth the size of h-TNR photoanode to the pair of h-TNR and CNT/a-CP successfully drives the standalone operation of both reactions at the high FEs (> 90%). The surface characterization of the as-synthesized materials and the reaction mechanism are discussed in detail. English ELSEVIER OXYGEN REDUCTION REACTION ELECTROCHEMICAL GENERATION H2O2 ARSENITE LAYERS Solar hydrogen peroxide production on carbon nanotubes wired to titania nanorod arrays catalyzing As(III) oxidation Article 10.1016/j.apcatb.2019.03.060 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.252, pp.55 - 61 APPLIED CATALYSIS B-ENVIRONMENTAL 252 55 61 scie scopus 000469906200008 2-s2.0-85064162375 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article OXYGEN REDUCTION REACTION ELECTROCHEMICAL GENERATION H2O2 ARSENITE LAYERS Artificial photosynthesis Oxygen reduction reaction Arsenic oxidation Carbon electrode TiO2 nanorod arrays