Article (Scientific journals)
Role of Electron Correlation along the Water Splitting Reaction.
Chu, Shibing; Coccia, Emanuele; BARBORINI, Matteo et al.
2016In Journal of Chemical Theory and Computation, 12 (12), p. 5803 - 5810
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Keywords :
Computer Science Applications; Physical and Theoretical Chemistry
Abstract :
[en] Electron correlation plays a crucial role in the energetics of reactions catalyzed by transition metal complexes, such as water splitting. In the present work we exploit the performance of various methods to describe the thermodynamics of a simple but representative model of water splitting reaction, based on a single cobalt ion as catalyst. Density Functional Theory (DFT) calculations show a significant dependence on the adopted functional, and not negligible differences with respect to CCSD(T) findings are found along the reaction cycle. We performed quantum Monte Carlo calculations using an unrestricted single Slater determinant wave function multiplied by a Jastrow factor using both DFT and fully optimized orbitals. Variational and Lattice Regularized Diffusion Monte Carlo results are in overall agreement with the CCSD(T) free-energy profile, even though differences in the description of the thermodynamics of the reaction cycle are found. NEVPT2 calculations reveal that the role of the static correlation of the different reaction steps is not large, and it is limited to only a few intermediate structures. Finally, the free-energy difference of the overall water splitting reaction computed at the quantum Monte Carlo level shows an excellent match with the experimental value of 4.92 eV, underlining the capability of these techniques to properly describe the dynamical correlation of such reactions.
Disciplines :
Physics
Author, co-author :
Chu, Shibing;  Dipartimento di Scienze Fisiche e Chimiche, Università degli studi dell'Aquila , Via Vetoio (Coppito), 67100 L'Aquila, Italy
Coccia, Emanuele;  Dipartimento di Scienze Fisiche e Chimiche, Università degli studi dell'Aquila , Via Vetoio (Coppito), 67100 L'Aquila, Italy ; Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire de Chimie Théorique, CC 137-4 place Jussieu, F. 75252 Paris Cedex 05, France
BARBORINI, Matteo  ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > HPC Platform ; CNR-NANO, Via Campi 213/a, 41125 Modena, Italy
Guidoni, Leonardo;  Dipartimento di Scienze Fisiche e Chimiche, Università degli studi dell'Aquila , Via Vetoio (Coppito), 67100 L'Aquila, Italy
External co-authors :
yes
Language :
English
Title :
Role of Electron Correlation along the Water Splitting Reaction.
Publication date :
13 December 2016
Journal title :
Journal of Chemical Theory and Computation
ISSN :
1549-9618
eISSN :
1549-9626
Publisher :
American Chemical Society, United States
Volume :
12
Issue :
12
Pages :
5803 - 5810
Peer reviewed :
Peer Reviewed verified by ORBi
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