Journal ArticleDOI
Factors controlling oxophilicity and carbophilicity of transition metals and main group metals
TLDR
In this article, a predictive model was proposed to predict oxophilic and carbophilic properties of transition metals and main group metals, including DFT-calculated adsorption energies and experimental formation energies.Abstract:
The strength of interaction between a metal and oxygen and/or carbon is a crucial factor for catalytic performance, materials stability, and other important applications. While these are fundamental properties in materials science, there is no general understanding of what makes a metal oxophilic or carbophilic, especially for main group metals. In this work, we elucidate the factors that control how oxophilic or carbophilic a metal is by creating a predictive model and applying it to a variety of data sets for transition metals and main group metals, including DFT-calculated adsorption energies and experimental formation energies. Our model is easily interpretable and accurately describes oxophilic and carbophilic trends across different regions of the periodic table. This model captures the ionic contribution to bonding, the adsorbate-sp contribution to bonding, and the adsorbate-d contribution to bonding by using the reduction potential, matrix coupling elements, band centers, and band filling. For transition metals, the adsorbate–surface d coupling is the major factor that determines oxophilicity relative to carbophilicity. For metals that do not contain d electrons either in their core or valence shell (Li, Be, Na, Mg, Al, K, and Ca), the reduction potential and the adsorbate–surface s coupling are the major factors. As a simple application, we demonstrate the utility of oxophilicity and carbophilicity in rapidly screening metal dopants for improved selectivity for ethylene epoxidation on silver-based catalysts. Using our model, we establish a direct relationship between the electronic properties of the metal dopants and their calculated selectivity for ethylene epoxidation. The results suggest that transition metals with high adsorbate–surface d coupling and s block metals with low adsorbate–surface s coupling are good silver-dopant candidates for this reaction. Overall, the improved linkage between a metal's electronic structure and its interaction with carbon or oxygen will be broadly useful in design of functional materials for a variety of applications.read more
Citations
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Correcting Density Functional Theory for Accurate Predictions of Compound Enthalpies of Formation:Fitted elemental-phase Reference Energies (FERE)
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Well-Defined Copper-Based Nanocatalysts for Selective Electrochemical Reduction of CO2 to C2 Products
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Boosting Photocatalytic Nitrogen Fixation via Constructing Low-Oxidation-State Active Sites in the Nanoconfined Spinel Iron Cobalt Oxide
TL;DR: In this article , a nanoconfined spinel iron cobalt oxide (FeCo2O4) is prepared, which has a low oxidation state and stronger Fe's 3D orbital electron-donating capability of iron active sites and can efficiently transfer electrons to N2 π* orbitals to facilitate activation of nitrogen.
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Recent progress towards a universal machine learning model for reaction energetics in heterogeneous catalysis
TL;DR: In this article , the authors discuss recently developed ML methods in the field of heterogeneous catalysis that represent progress towards more general models, which can lead to significant increases in efficiency and convenience.
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Tuning reactivity in trimetallic dual-atom alloys: molecular-like electronic states and ensemble effects
TL;DR: In this paper , the authors use computational studies to show that DAAs allow tuning of the active site electronic structure and reactivity, and that combining two SAAs into a dual-atom site can result in molecular-like hybridization by virtue of the free-atom-like electronic d states exhibited by many SAAs.
References
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Journal ArticleDOI
Why gold is the noblest of all the metals
Bjørk Hammer,Jens K. Nørskov +1 more
TL;DR: In this paper, a simple surface reaction, the dissociation of H2 on the surface of gold and of three other metals (copper, nickel and platinum) that lie close to it in the periodic table, was studied.