Electrocatalytic Hydrogen Evolution under Densely Buffered Neutral pH Conditions

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Division of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
*E-mail: [email protected]. Phone: +966 12 808 4485.
Cite this: J. Phys. Chem. C 2015, 119, 35, 20453–20458
Publication Date (Web):August 18, 2015
Copyright © 2015 American Chemical Society
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Under buffered neutral pH conditions, solute concentrations drastically influence the hydrogen evolution reaction (HER). The iR-free HER performance as a function of solute concentration was found to exhibit a volcano-shaped trend in sodium phosphate solution at pH 5, with the maximum occurring at 2 M. A detailed microkinetic model that includes calculated activity coefficients, solution resistance, and mass-transport parameters accurately describes the measured values, clarifying that the overall HER performance is predominantly governed by mass-transport of slow phosphate ions (weak acid). In the HER at the optimum concentration of approximately 2 M sodium phosphate at pH 5, our theoretical model predicts that the concentration overpotential accounts for more than half of the required overpotential. The substantial concentration overpotential would originate from the electrolyte property, suggesting that the proper electrolyte engineering will result in an improved apparent HER performances. The significance of concentration overpotential shown in the study is critical in the advancement of electrocatalysis, biocatalysis, and photocatalysis.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpcc.5b05295.

  • CVs with Ar bubbling, consideration on the HER reactant and resultant kinetic description, LSVs at various disk-rotation speeds, calculated physical parameters (activity coefficient, diffusion layer thickness and solution resistance), and calculated half-cell efficiencies under various conditions (PDF)

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