Solar hydrogen peroxide production on carbon nanotubes wired to titania nanorod arrays catalyzing As(III) oxidation

Title
Solar hydrogen peroxide production on carbon nanotubes wired to titania nanorod arrays catalyzing As(III) oxidation
Authors
김진영최승요김성훈이경진한동숙박현웅
Issue Date
2019-09
Publisher
Applied catalysis B, Environmental
Citation
VOL 252-61
Abstract
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 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.
URI
http://pubs.kist.re.kr/handle/201004/70620
ISSN
0926-3373
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