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Cited 2 time in webofscience Cited 4 time in scopus
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Unveiling the effect of gas treatment on the electronic structure of carbon nanotube-supported Pd catalysts for electroreduction of H2O2 and Heck reaction

Authors
Kim, J.Y.Jo, Y.Kim, J.D.Choi, M.Y.Lee, S.Choi, H.C.
Issue Date
Nov-2022
Publisher
Pergamon Press Ltd.
Keywords
Carbon nanotube; Carbon nanotube supported Pd catalyst; Catalytic activity; Gas treatment; Surface structure; X-ray photoelectron spectroscopy
Citation
Chemosphere, v.307
Indexed
SCIE
SCOPUS
Journal Title
Chemosphere
Volume
307
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/790
DOI
10.1016/j.chemosphere.2022.135838
ISSN
0045-6535
1879-1298
Abstract
This study explored the impact of gas treatments on the structures of multi-walled carbon nanotubes supported Pd (CNT-Pd) catalysts used for electrocatalytic H2O2 reduction and the Heck cross-coupling reaction. The CNT-Pd catalyst was prepared by anchoring Pd nanoparticles on thiolated CNTs. XPS was conducted to examine the surface composition and electronic structure changes of the CNT-Pd catalyst before and after gas treatment. The XPS results revealed that as-prepared CNT-Pd contains at least two different oxidation states on the surface, whereon their proportions depend on the gas used for treatment. Treatment with H2 leads to Pd(0) enrichment near the surface, while O2 treatment causes Pd(Ⅱ) enrichment of CNT-Pd. All catalysts containing both Pd(0) and Pd(Ⅱ) were active toward H2O2 reduction, and the Heck cross-coupling reaction of n-butyl acrylate and 4-iodotoluene; increased proportion of metallic Pd(0) boosted the catalytic reaction. However, the catalyst stability increased as the amount of Pd(II) increased. ? 2022 Elsevier Ltd
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자연과학대학 (화학과)
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