Controllable synthesis of hydroxyapatite-supported palladium nanoparticles with enhanced catalytic activity

Zhang, Xuefei; Yates, Matthew Z.

doi:10.1016/j.surfcoat.2018.07.075

Title: Controllable synthesis of hydroxyapatite-supported palladium nanoparticles with enhanced catalytic activity

Abstract

A multi-stage electrochemical method was developed to synthesize palladium (Pd) nanoparticles supported on hydroxyapatite (HA) coatings. In the first stage, a dense coating of HA nanocrystals was synthesized from an aqueous electrolyte solution onto a titanium cathode surface through a galvanostatic process. The HA-coated titanium electrode was then used as the cathode for the electrochemical reduction of Pd2+ from aqueous solution. A synthesis approach using two sequential electrochemical reduction reactions was found to be more e ective in producing uniform coatings of Pd nanoparticles than a single stage reduction. In the first step, a higher voltage was applied to the cathode for a short time to promote the nucleation of Pd nanoparticles. A lower voltage was then applied for a longer time in the second stage to promote the growth of the Pd nanoparticles. The size and size distribution of the Pd nanoparticles were controlled by adjusting the duration of the first and second stages of electrochemical reduction. The resulting HA supported Pd nanoparticles demonstrated significantly higher catalytic activity than commercial Pd nanoparticles in the degradation of methyl orange by NaBH₄. The high surface area and the complex oxidation states of the HA-supported Pd nanoparticles are believed to account formore » the enhanced catalytic activity.« less

Authors:

Zhang, Xuefei ^[1];

^[1]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Publication Date:: Thu Jul 26 00:00:00 EDT 2018

Research Org.:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1479287

Alternate Identifier(s):: OSTI ID: 1702619

Report Number(s):: 2018-302, 1445
Journal ID: ISSN 0257-8972; 2018-302, 1445, 2403

Grant/Contract Number:: NA0001944; FC03-92SF19460

Resource Type:: Accepted Manuscript

Journal Name:: Surface and Coatings Technology

Additional Journal Information:: Journal Volume: 351; Journal Issue: C; Journal ID: ISSN 0257-8972

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Hydroxyapatite, Electrochemical, Composite, Palladium

Citation Formats


                    Zhang, Xuefei, and Yates, Matthew Z. Controllable synthesis of hydroxyapatite-supported palladium nanoparticles with enhanced catalytic activity.  United States: N. p., 2018. 
Web.  doi:10.1016/j.surfcoat.2018.07.075.

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                    Zhang, Xuefei, & Yates, Matthew Z. Controllable synthesis of hydroxyapatite-supported palladium nanoparticles with enhanced catalytic activity.  United States.  https://doi.org/10.1016/j.surfcoat.2018.07.075

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                    Zhang, Xuefei, and Yates, Matthew Z. Thu .  
"Controllable synthesis of hydroxyapatite-supported palladium nanoparticles with enhanced catalytic activity".  United States.  https://doi.org/10.1016/j.surfcoat.2018.07.075.  https://www.osti.gov/servlets/purl/1479287.

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@article{osti_1479287,

  title        = {Controllable synthesis of hydroxyapatite-supported palladium nanoparticles with enhanced catalytic activity},

  author       = {Zhang, Xuefei and Yates, Matthew Z.},

  abstractNote = {A multi-stage electrochemical method was developed to synthesize palladium (Pd) nanoparticles supported on hydroxyapatite (HA) coatings. In the first stage, a dense coating of HA nanocrystals was synthesized from an aqueous electrolyte solution onto a titanium cathode surface through a galvanostatic process. The HA-coated titanium electrode was then used as the cathode for the electrochemical reduction of Pd2+ from aqueous solution. A synthesis approach using two sequential electrochemical reduction reactions was found to be more e ective in producing uniform coatings of Pd nanoparticles than a single stage reduction. In the first step, a higher voltage was applied to the cathode for a short time to promote the nucleation of Pd nanoparticles. A lower voltage was then applied for a longer time in the second stage to promote the growth of the Pd nanoparticles. The size and size distribution of the Pd nanoparticles were controlled by adjusting the duration of the first and second stages of electrochemical reduction. The resulting HA supported Pd nanoparticles demonstrated significantly higher catalytic activity than commercial Pd nanoparticles in the degradation of methyl orange by NaBH4. The high surface area and the complex oxidation states of the HA-supported Pd nanoparticles are believed to account for the enhanced catalytic activity.},

  doi          = {10.1016/j.surfcoat.2018.07.075},

  journal      = {Surface and Coatings Technology},

  number       = C,

  volume       = 351,

  place        = {United States},

  year         = {Thu Jul 26 00:00:00 EDT 2018},

  month        = {Thu Jul 26 00:00:00 EDT 2018}

}

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https://doi.org/10.1016/j.surfcoat.2018.07.075

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Cited by: 5 works

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Figure 1: SEM images of (a) HA nanocrystals grown on a Ti substrate, (b) HA nanocrystals after deposition of Pd nanoparticles by application of a constant voltage of 3.2 V for 195 s, (c) HA nanocrystals after deposition of Pd nanoparticles by application of a constant voltage of 5.4 Vmore »

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