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AuthorChoi S.Y.
AuthorKim S.
AuthorLee K.J.
AuthorKim J.Y.
AuthorHan D.S.
AuthorPark H.
Available date2020-04-23T14:21:32Z
Publication Date2019
Publication NameApplied Catalysis B: Environmental
ResourceScopus
ISSN9263373
URIhttp://dx.doi.org/10.1016/j.apcatb.2019.03.060
URIhttp://hdl.handle.net/10576/14326
AbstractWe 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 O2, leading to a Faradaic efficiency (FE) of ?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. - 2019 Elsevier B.V.
SponsorThis research was supported by the Basic Science Research Program ( 2019R1A2C2002602 and 2018R1A6A1A03024962 ), the Framework of International Cooperation Program ( NRF-2018K2A9A1A01090462 ), and the Global Research Laboratory (GRL) Program ( 2014K1A1A2041044 ) through the National Research Foundation, Korea . In addition, we are grateful for the financial support provided by the Korea CCS R&D Center (KCRC) (no. 2014M1A8A1049354 ). This publication was made possible by a grant from the Qatar National Research Fund under its National Priorities Research Program (NPRP 10-1210-160019 ). Appendix A
Languageen
PublisherElsevier B.V.
SubjectArsenic oxidation
Artificial photosynthesis
Carbon electrode
Oxygen reduction reaction
TiO2 nanorod arrays
TitleSolar hydrogen peroxide production on carbon nanotubes wired to titania nanorod arrays catalyzing As(III) oxidation
TypeArticle
Pagination55-61
Volume Number252


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