Highly efficient overall urea electrolysis via single-atomically active centers on layered double hydroxide.

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  • Additional Information
    • Source:
      Publisher: Elsevier B.V. Country of Publication: Netherlands NLM ID: 101655530 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 2095-9281 (Electronic) Linking ISSN: 20959273 NLM ISO Abbreviation: Sci Bull (Beijing) Subsets: MEDLINE
    • Publication Information:
      Publication: 2017- : Amsterdam : Beijing : Elsevier B.V. ; Science China Press
      Original Publication: Beijing : Berlin ; Heidelberg : Science China Press ; Springer-Verlag, 2015-
    • Subject Terms:
      Urea* ; Electrolysis*; Blood Urea Nitrogen ; Hydrogen ; Hydroxides ; Oxygen
    • Abstract:
      Anodic urea oxidation reaction (UOR) is an intriguing half reaction that can replace oxygen evolution reaction (OER) and work together with hydrogen evolution reaction (HER) toward simultaneous hydrogen fuel generation and urea-rich wastewater purification; however, it remains a challenge to achieve overall urea electrolysis with high efficiency. Herein, we report a multifunctional electrocatalyst termed as Rh/NiV-LDH, through integration of nickel-vanadium layered double hydroxide (LDH) with rhodium single-atom catalyst (SAC), to achieve this goal. The electrocatalyst delivers high HER mass activity of 0.262 A mg -1 and exceptionally high turnover frequency (TOF) of 2.125 s -1 at an overpotential of 100 mV. Moreover, exceptional activity toward urea oxidation is addressed, which requires a potential of 1.33 V to yield 10 mA cm -2 , endorsing the potential to surmount the sluggish OER. The splendid catalytic activity is enabled by the synergy of the NiV-LDH support and the atomically dispersed Rh sites (located on the Ni-V hollow sites) as evidenced both experimentally and theoretically. The self-supported Rh/NiV-LDH catalyst serving as the anode and cathode for overall urea electrolysis (1 mol L -1 KOH with 0.33 mol L -1 urea as electrolyte) only requires a small voltage of 1.47 V to deliver 100 mA cm -2 with excellent stability. This work provides important insights into multifunctional SAC design from the perspective of support sites toward overall electrolysis applications.
      Competing Interests: Conflict of interest The authors declare that they have no conflict of interest.
      (Copyright © 2022 Science China Press. Published by Elsevier B.V. All rights reserved.)
    • Contributed Indexing:
      Keywords: High turnover frequency; Hydrogen evolution reaction; Layer double hydroxide; Overall urea electrolysis; Single-atomically active centers
    • Accession Number:
      8W8T17847W (Urea)
      9159UV381P (hydroxide ion)
      7YNJ3PO35Z (Hydrogen)
      0 (Hydroxides)
      S88TT14065 (Oxygen)
    • Publication Date:
      Date Created: 20221222 Date Completed: 20221223 Latest Revision: 20230106
    • Publication Date:
      20240829
    • Accession Number:
      10.1016/j.scib.2022.08.008
    • Accession Number:
      36546062