Identification of Active Hydrogen Species on Palladium Nanoparticles

May 25, 2017 - Engineering Research Center for Waste Oil Recovery Technology and Equipment, ... and Business University, Chongqing 400067, China. ‡...
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Identification of Active Hydrogen Species on Palladium Nanoparticles for an Enhanced Electrocatalytic Hydrodechlorination of 2,4-Dichlorophenol in Water Guangming Jiang, Mengna Lan, Zhiyong Zhang, Xiaoshu Lv, Zimo Lou, Xinhua Xu, Fan Dong, and Sen Zhang Environ. Sci. Technol., Just Accepted Manuscript • Publication Date (Web): 25 May 2017 Downloaded from http://pubs.acs.org on May 28, 2017

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Environmental Science & Technology

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Identification of Active Hydrogen Species on Palladium Nanoparticles for an Enhanced Electrocatalytic Hydrodechlorination of 2,4-Dichlorophenol in Water

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Guangming Jiang,†,* Mengna Lan,† Zhiyong Zhang,‡ Xiaoshu Lv,† Zimo Lou,# Xinhua

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Xu, # Fan Dong,† Sen Zhang‡,*

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Engineering Research Center for Waste Oil Recovery Technology and

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Equipment, Ministry of Education, Chongqing Technology and Business University,

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Chongqing 400067,China

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Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA

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Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China

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To whom correspondence should be addressed.

E-mail: [email protected], [email protected].

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ACS Paragon Plus Environment

Environmental Science & Technology

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ABSTRACT

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Clarifying hydrogen evolution and identifying the active hydrogen species are crucial

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to the understanding of electrocatalytic hydrodechlorination (EHDC) mechanism.

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Here, monodisperse palladium nanoparticles (Pd NPs) are used as a model catalyst to

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demonstrate the potential-dependent evolutions of three hydrogen species, including

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adsorbed atomic hydrogen (H*ads), absorbed atomic hydrogen (H*abs) and molecular

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hydrogen (H2) on Pd NPs, and then their effect on EHDC of 2,4-dichlorophenol

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(2,4-DCP). Our results show that H*ads, H*abs and H2 all emerge at -0.65 V (vs.

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Ag/AgCl), and have increased amounts at more negative potentials, except for H*ads

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that exhibits a reversed trend with potential varying from -0.85 to -0.95 V. Overall, the

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concentrations of these three species evolve in an order of H*abs