Journal ArticleDOI
Simple, Unambiguous Theoretical Approach to Oxidation State Determination via First-Principles Calculations
TLDR
A novel theoretical approach for determining oxidation states (OS) from quantum-mechanical calculations for transition-metal ion systems is introduced using density-functional theory with a Hubbard U correction and the oxidation states were determined without ambiguity.Abstract:
We introduce a novel theoretical approach for determining oxidation states (OS) from quantum-mechanical calculations. For a transition-metal ion, for example, the metal–ligand orbital mixing contribution to the charge allocated to the ion is separated from that due to the actual occupation of the d-orbitals from which OS can then be inferred. We report the application of this approach to different transition-metal systems: molecular complexes, ruthenium-dye molecules, ruthenium complexes with noninnocent ligands, and bulk semiconductors. The computations were carried out using density-functional theory with a Hubbard U correction. The oxidation states were determined without ambiguity.read more
Citations
More filters
Journal ArticleDOI
Intrinsic Atomic Orbitals: An Unbiased Bridge between Quantum Theory and Chemical Concepts.
TL;DR: An exceptionally simple algebraic construction allows for defining atomic core and valence orbitals, polarized by the molecular environment, which can exactly represent self-consistent field wave functions, providing an unbiased and direct connection between quantum chemistry and empirical chemical concepts.
Journal ArticleDOI
Unified structural motifs of the catalytically active state of Co(oxyhydr)oxides during the electrochemical oxygen evolution reaction
Arno Bergmann,Arno Bergmann,Travis E. Jones,Elias Martinez Moreno,Detre Teschner,Detre Teschner,Petko Chernev,Manuel Gliech,Tobias Reier,Holger Dau,Peter Strasser,Peter Strasser +11 more
TL;DR: In this paper, the atomic-scale structural evolution of well-defined CoOx(OH)y compounds into their catalytically active state during electrocatalytic operation through operando and surface-sensitive X-ray spectroscopy and surface voltammetry, supported by theoretical calculations.
Journal ArticleDOI
Iced photochemical reduction to synthesize atomically dispersed metals by suppressing nanocrystal growth
Hehe Wei,Kai Huang,Da Wang,Ruoyu Zhang,Binghui Ge,Jingyuan Ma,Bo Wen,Shuai Zhang,Qunyang Li,Ming Lei,Cheng Zhang,Joshua Irawan,Li-Min Liu,Hui Wu +13 more
TL;DR: A facile approach is demonstrated to generate atomically dispersed platinum via photochemical reduction of frozen chloroplatinic acid solution using ultraviolet light to obtain atomically-dispersed platinum catalysts with high electrocatalytic performance.
Journal ArticleDOI
Characterization of NiFe oxyhydroxide electrocatalysts by integrated electronic structure calculations and spectroelectrochemistry.
Zachary K. Goldsmith,Aparna Karippara Harshan,James B. Gerken,Márton Vörös,Márton Vörös,Giulia Galli,Giulia Galli,Shannon S. Stahl,Sharon Hammes-Schiffer +8 more
TL;DR: A combination of hybrid periodic density functional theory calculations and spectroelectrochemical experiments elucidate the electronic structure and redox thermodynamics of Ni-only and mixed NiFe oxyhydroxide thin-film electrocatalysts and serve as an important benchmark for computational characterization of mixed-metal oxidation states in heterogeneous catalysts.
Journal ArticleDOI
DFT+U Study of the Surface Structure and Stability of Co3O4(110): Dependence on U
Sencer Selcuk,Annabella Selloni +1 more
TL;DR: In this paper, the authors used density functional theory with the on-site Coulomb U term to study the structure and stability of two possible truncations of tricobalt tetraoxide, Co3O4(110), in the presence of oxygen gas and water vapor.
References
More filters
Journal ArticleDOI
QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials
Paolo Giannozzi,Stefano Baroni,Stefano Baroni,Nicola Bonini,Matteo Calandra,Roberto Car,Carlo Cavazzoni,Davide Ceresoli,Guido L. Chiarotti,Matteo Cococcioni,Ismaila Dabo,Andrea Dal Corso,Andrea Dal Corso,Stefano de Gironcoli,Stefano de Gironcoli,Stefano Fabris,Stefano Fabris,Guido Fratesi,Ralph Gebauer,Ralph Gebauer,Uwe Gerstmann,Christos Gougoussis,Anton Kokalj,Michele Lazzeri,Layla Martin-Samos,Nicola Marzari,Francesco Mauri,Riccardo Mazzarello,Stefano Paolini,Alfredo Pasquarello,Lorenzo Paulatto,Lorenzo Paulatto,Carlo Sbraccia,Sandro Scandolo,Sandro Scandolo,Gabriele Sclauzero,Gabriele Sclauzero,Ari P. Seitsonen,Alexander Smogunov,Paolo Umari,Renata M. Wentzcovitch +40 more
TL;DR: QUANTUM ESPRESSO as discussed by the authors is an integrated suite of computer codes for electronic-structure calculations and materials modeling, based on density functional theory, plane waves, and pseudopotentials (norm-conserving, ultrasoft, and projector-augmented wave).
Journal ArticleDOI
Soft self-consistent pseudopotentials in a generalized eigenvalue formalism.
TL;DR: Novel features are that the pseudopotential itself becomes charge-state dependent, the usual norm-conservation constraint does not apply, and a generalized eigenproblem is introduced.
Journal ArticleDOI
Intermolecular interactions from a natural bond orbital, donor-acceptor viewpoint
Journal ArticleDOI
Electronic Population Analysis on LCAO–MO Molecular Wave Functions. I
TL;DR: In this paper, an analysis in quantitative form is given in terms of breakdowns of the electronic population into partial and total ''gross atomic populations'' and ''overlap populations'' for molecules.
Journal Article
Photoelectrochemical cells : Materials for clean energy
TL;DR: In this paper, the authors look into the historical background, and present status and development prospects for photoelectrochemical cells, based on nanocrystalline materials and conducting polymer films.
Related Papers (5)
Generalized Gradient Approximation Made Simple
QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials
Paolo Giannozzi,Stefano Baroni,Stefano Baroni,Nicola Bonini,Matteo Calandra,Roberto Car,Carlo Cavazzoni,Davide Ceresoli,Guido L. Chiarotti,Matteo Cococcioni,Ismaila Dabo,Andrea Dal Corso,Andrea Dal Corso,Stefano de Gironcoli,Stefano de Gironcoli,Stefano Fabris,Stefano Fabris,Guido Fratesi,Ralph Gebauer,Ralph Gebauer,Uwe Gerstmann,Christos Gougoussis,Anton Kokalj,Michele Lazzeri,Layla Martin-Samos,Nicola Marzari,Francesco Mauri,Riccardo Mazzarello,Stefano Paolini,Alfredo Pasquarello,Lorenzo Paulatto,Lorenzo Paulatto,Carlo Sbraccia,Sandro Scandolo,Sandro Scandolo,Gabriele Sclauzero,Gabriele Sclauzero,Ari P. Seitsonen,Alexander Smogunov,Paolo Umari,Renata M. Wentzcovitch +40 more