Correlating hydrogen oxidation and evolution activity on platinum at different pH with measured hydrogen binding energy.
TL;DR: The correlation between hydrogen oxidation/evolution activity and experimentally measured hydrogen binding energy for polycrystalline platinum examined in several buffer solutions in a wide range of electrolyte pH is reported, strongly supporting the hypothesis that hydrogen binding power is the sole reaction descriptor for the hydrogen oxidation-evolution reaction on monometallic platinum.
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Abstract: The hydrogen oxidation/evolution reactions are two of the most fundamental reactions in distributed renewable electrochemical energy conversion and storage systems. The identification of the reaction descriptor is therefore of critical importance for the rational catalyst design and development. Here we report the correlation between hydrogen oxidation/evolution activity and experimentally measured hydrogen binding energy for polycrystalline platinum examined in several buffer solutions in a wide range of electrolyte pH from 0 to 13. The hydrogen oxidation/evolution activity obtained using the rotating disk electrode method is found to decrease with the pH, while the hydrogen binding energy, obtained from cyclic voltammograms, linearly increases with the pH. Correlating the hydrogen oxidation/evolution activity to the hydrogen binding energy renders a monotonic decreasing hydrogen oxidation/evolution activity with the hydrogen binding energy, strongly supporting the hypothesis that hydrogen binding energy is the sole reaction descriptor for the hydrogen oxidation/evolution activity on monometallic platinum.
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References
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TL;DR: In this paper, the authors present a survey of electrochemical methods and their applications, focusing on the following categories: electrochemical water treatment methods, electrochemical method fundamentals and applications, and student solutions manual.
15.5K
Identification of active edge sites for electrochemical H2 evolution from MoS2 nanocatalysts.
Thomas F. Jaramillo,Kristina Pilt Jørgensen,Jacob Lindner Bonde,Jane Hvolbæk Nielsen,Sebastian Horch,Ib Chorkendorff +5 more
TL;DR: The active site for hydrogen evolution, a reaction catalyzed by precious metals, on nanoparticulate molybdenum disulfide (MoS2) is determined by atomically resolving the surface of this catalyst before measuring electrochemical activity in solution.
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Trends in the exchange current for hydrogen evolution
Jens K. Nørskov,Thomas Bligaard,Ashildur Logadottir,John R. Kitchin,Jingguang G. Chen,S. Pandelov,Ulrich Stimming +6 more
TL;DR: A density functional theory database of hydrogen chemisorption energies on close packed surfaces of a number of transition andnoble metals is presented in this article, where the bond energies are used to understand the trends in the exchange current for hydrogen evolution.
Computational high-throughput screening of electrocatalytic materials for hydrogen evolution
TL;DR: A density functional theory-based, high-throughput screening scheme that successfully uses these strategies to identify a new electrocatalyst for the hydrogen evolution reaction (HER), which is found to have a predicted activity comparable to, or even better than, pure Pt, the archetypical HER catalyst.
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Trends in the Exchange Current for Hydrogen Evolution.
Jens K. Noerskov,Thomas Bligaard,Ashildur Logadottir,John R. Kitchin,Jingguang G. Chen,S. Pandelov,Ulrich Stimming +6 more
Abstract: Department of Physics, Technical University Munich, D-85748 Garching, GermanyA density functional theory database of hydrogen chemisorption energies on close packed surfaces of a number of transition andnoble metals is presented. The bond energies are used to understand the trends in the exchange current for hydrogen evolution. Avolcano curve is obtained when measured exchange currents are plotted as a function of the calculated hydrogen adsorptionenergies and a simple kinetic model is developed to understand the origin of the volcano. The volcano curve is also consistent withPt being the most efficient electrocatalyst for hydrogen evolution.© 2005 The Electrochemical Society. @DOI: 10.1149/1.1856988# All rights reserved.Manuscript submitted May 10, 2004; revised manuscript received August 12, 2004. Available electronically January 24, 2005.
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