1
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da Silva Alvim R, Esio Bresciani A, Alves RMB. Formic acid stability in different solvents by DFT calculations. J Mol Model 2024; 30:67. [PMID: 38345658 DOI: 10.1007/s00894-024-05849-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Accepted: 01/17/2024] [Indexed: 03/16/2024]
Abstract
CONTEXT New technologies have been developed toward the use of green energies. The production of formic acid (FA) from carbon dioxide (CO[Formula: see text]) hydrogenation with H[Formula: see text] is a sustainable process for H[Formula: see text] storage. However, the FA adduct stabilization is thermodynamically dependent on the type of solvent and thermodynamic conditions. The results suggest a wide range of dielectric permittivity values between the dimethyl sulfoxide (DMSO) and water solvents to stabilize the FA in the absence of base. The thermodynamics analysis and the infrared and charge density difference results show that the formation of the FA complex with H[Formula: see text]O is temperature dependent and has a major influence on aqueous solvents compared to the FA adduct with amine, in good agreement with the experiment. In these conditions, the stability thermodynamic of the FA molecule may be favorable at non-organic solvents and dielectric permittivity values closer to water. Therefore, a mixture of aqueous solvents with possible ionic composition could be used to increase the thermodynamic stability of H[Formula: see text] storage in CO[Formula: see text] conversion processes. METHODS Using the Quantum ESPRESSO package, density functional theory (DFT) calculations were performed with periodic boundary conditions, and the electronic wave functions were expanded in plane waves. For the exchange-correlation functional, we use the vdW-DF functional with the inclusion of van der Waals (vdW) forces. Electron-ion interactions are treated by the projector augmented wave (PAW) method with pseudopotentials available in the PSlibrary repository. The wave functions and the electronic densities were expanded employing accurate cut-off energies of 6.80[Formula: see text]10[Formula: see text] and 5.44[Formula: see text]10[Formula: see text] eV, respectively. The electronic density was computed from the wave functions calculated at the [Formula: see text]-point in the first Brillouin-zone. Each structural optimization was minimized according to the Broyden-Fletcher-Goldfarb-Shanno (BFGS) algorithm, with force and energy convergence criteria of 25 meV[Formula: see text]Å[Formula: see text] and 1.36 meV, respectively. The electrostatic solvation effects were performed by the [Formula: see text] package with the Self-Consistent Continuum Solvation (SCCS) approach.
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Affiliation(s)
- Raphael da Silva Alvim
- Departamento de Engenharia Química, Escola Politécnica, Universidade de São Paulo, São Paulo, SP, 05508-900, Brazil.
| | - Antonio Esio Bresciani
- Departamento de Engenharia Química, Escola Politécnica, Universidade de São Paulo, São Paulo, SP, 05508-900, Brazil
| | - Rita Maria Brito Alves
- Departamento de Engenharia Química, Escola Politécnica, Universidade de São Paulo, São Paulo, SP, 05508-900, Brazil
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2
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Abstract
Adsorption energy (AE) of reactive intermediate is currently the most important descriptor for electrochemical reactions (e.g., water electrolysis, hydrogen fuel cell, electrochemical nitrogen fixation, electrochemical carbon dioxide reduction, etc.), which can bridge the gap between catalyst's structure and activity. Tracing the history and evolution of AE can help to understand electrocatalysis and design optimal electrocatalysts. Focusing on oxygen electrocatalysis, this review aims to provide a comprehensive introduction on how AE is selected as the activity descriptor, the intrinsic and empirical relationships related to AE, how AE links the structure and electrocatalytic performance, the approaches to obtain AE, the strategies to improve catalytic activity by modulating AE, the extrinsic influences on AE from the environment, and the methods in circumventing linear scaling relations of AE. An outlook is provided at the end with emphasis on possible future investigation related to the obstacles existing between adsorption energy and electrocatalytic performance.
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Affiliation(s)
- Junming Zhang
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
| | - Hong Bin Yang
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
| | - Daojin Zhou
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China.,Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, Ontario M5S 1A4, Canada
| | - Bin Liu
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore
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3
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Zhong JQ, Yan KJ, Yang J, Yang WH, Yang XD. Microenvironment Alters the Oxygen Reduction Activity of Metal/N/C Catalysts at the Triple-Phase Boundary. ACS Catal 2022. [DOI: 10.1021/acscatal.2c00362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jia-Qiang Zhong
- College of Materials Science and Engineering, Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing, Huaqiao University, Xiamen, Fujian 362021, People’s Republic of China
| | - Ke-Jing Yan
- College of Materials Science and Engineering, Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing, Huaqiao University, Xiamen, Fujian 362021, People’s Republic of China
| | - Jing Yang
- College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China
| | - Wei-Hua Yang
- College of Materials Science and Engineering, Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing, Huaqiao University, Xiamen, Fujian 362021, People’s Republic of China
| | - Xiao-Dong Yang
- College of Materials Science and Engineering, Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing, Huaqiao University, Xiamen, Fujian 362021, People’s Republic of China
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4
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Wang SH, Pillai HS, Wang S, Achenie LEK, Xin H. Infusing theory into deep learning for interpretable reactivity prediction. Nat Commun 2021; 12:5288. [PMID: 34489441 PMCID: PMC8421337 DOI: 10.1038/s41467-021-25639-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 08/20/2021] [Indexed: 02/07/2023] Open
Abstract
Despite recent advances of data acquisition and algorithms development, machine learning (ML) faces tremendous challenges to being adopted in practical catalyst design, largely due to its limited generalizability and poor explainability. Herein, we develop a theory-infused neural network (TinNet) approach that integrates deep learning algorithms with the well-established d-band theory of chemisorption for reactivity prediction of transition-metal surfaces. With simple adsorbates (e.g., *OH, *O, and *N) at active site ensembles as representative descriptor species, we demonstrate that the TinNet is on par with purely data-driven ML methods in prediction performance while being inherently interpretable. Incorporation of scientific knowledge of physical interactions into learning from data sheds further light on the nature of chemical bonding and opens up new avenues for ML discovery of novel motifs with desired catalytic properties.
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Affiliation(s)
- Shih-Han Wang
- grid.438526.e0000 0001 0694 4940Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA USA
| | - Hemanth Somarajan Pillai
- grid.438526.e0000 0001 0694 4940Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA USA
| | - Siwen Wang
- grid.438526.e0000 0001 0694 4940Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA USA
| | - Luke E. K. Achenie
- grid.438526.e0000 0001 0694 4940Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA USA
| | - Hongliang Xin
- grid.438526.e0000 0001 0694 4940Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA USA
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5
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Mei Y, Deskins NA. An evaluation of solvent effects and ethanol oxidation. Phys Chem Chem Phys 2021; 23:16180-16192. [PMID: 34297022 DOI: 10.1039/d1cp00630d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding liquid-metal interfaces in catalysis is important, as the liquid can speed up surface reactions, increase the selectivity of products, and open up new favorable reaction pathways. In this work we modeled using density functional theory various steps in ethanol oxidation/decomposition over Rh(111). We considered implicit (continuum), explicit, and hybrid (implicit combined with explicit) solvation approaches, as well as two solvents, water and ethanol. We focused on modeling adsorption steps, as well as C-C/C-H bond scission and C-O bond formation reactions. Implicit solvation had very little effect on adsorption and reaction free energies. However, using the explicit and hybrid models, some free energies changed significantly. Furthermore, ethanol solvent had a more considerable impact than water solvent. We observed that preferred reaction pathways for C-C scission changed depending on the solvation model and solvent choice (ethanol or water). We also applied the bond-additivity solvation method to calculate heats of adsorption. Heats of adsorption and reaction using the bond-additivity model followed the same trends as the other solvation models, but were ∼1.1 eV more endothermic. Our work highlights how different solvation approaches can influence analysis of the oxidation/decomposition of organic surface species.
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Affiliation(s)
- Yuhan Mei
- Department of Chemical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609, USA.
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6
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Piqué O, Low QH, Handoko AD, Yeo BS, Calle-Vallejo F. Selectivity Map for the Late Stages of CO and CO 2 Reduction to C 2 Species on Copper Electrodes. Angew Chem Int Ed Engl 2021; 60:10784-10790. [PMID: 33527641 DOI: 10.1002/anie.202014060] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 01/16/2021] [Indexed: 01/23/2023]
Abstract
The electrochemical CO and CO2 reduction reactions (CORR and CO2 RR) using copper catalysts and renewable electricity hold promise as a carbon-neutral route to produce commodity chemicals and fuels. However, the exact mechanisms and structure sensitivity of Cu electrodes toward C2 products are still under debate. Herein, we investigate ethylene oxide reduction (EOR) as a proxy to the late stages of CORR to ethylene, and the results are compared to those of acetaldehyde reduction to ethanol. Density functional theory (DFT) calculations show that ethylene oxide undergoes ring opening before exclusively reducing to ethylene via *OH formation. Based on generalized coordination numbers (CN), a selectivity map for the late stages of CORR and CO2 RR shows that sites with moderate coordination (5.9 < CN < 7.5) are efficient for ethylene production, with pristine Cu(100) being more active than defective surfaces such as Cu(311). In contrast, kinks and edges are more active for ethanol production, while (111) terraces are relatively inert.
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Affiliation(s)
- Oriol Piqué
- Departament de Ciència de Materials i Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Martí i Franquès 1, 08028, Barcelona, Spain
| | - Qi Hang Low
- Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.,Solar Energy Research Institute of Singapore (SERIS), National University of Singapore (NUS), 7 Engineering Drive 1, Building E3A, #06-01, Singapore, 117574, Singapore
| | - Albertus D Handoko
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore, 138634, Singapore
| | - Boon Siang Yeo
- Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.,Solar Energy Research Institute of Singapore (SERIS), National University of Singapore (NUS), 7 Engineering Drive 1, Building E3A, #06-01, Singapore, 117574, Singapore
| | - Federico Calle-Vallejo
- Departament de Ciència de Materials i Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Martí i Franquès 1, 08028, Barcelona, Spain
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7
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Piqué O, Low QH, Handoko AD, Yeo BS, Calle‐Vallejo F. Selectivity Map for the Late Stages of CO and CO
2
Reduction to C
2
Species on Copper Electrodes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202014060] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Oriol Piqué
- Departament de Ciència de Materials i Química Física & Institut de Química Teòrica i Computacional (IQTCUB) Universitat de Barcelona Martí i Franquès 1 08028 Barcelona Spain
| | - Qi Hang Low
- Department of Chemistry Faculty of Science National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore
- Solar Energy Research Institute of Singapore (SERIS) National University of Singapore (NUS) 7 Engineering Drive 1, Building E3A, #06-01 Singapore 117574 Singapore
| | - Albertus D. Handoko
- Institute of Materials Research and Engineering Agency for Science, Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis Singapore 138634 Singapore
| | - Boon Siang Yeo
- Department of Chemistry Faculty of Science National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore
- Solar Energy Research Institute of Singapore (SERIS) National University of Singapore (NUS) 7 Engineering Drive 1, Building E3A, #06-01 Singapore 117574 Singapore
| | - Federico Calle‐Vallejo
- Departament de Ciència de Materials i Química Física & Institut de Química Teòrica i Computacional (IQTCUB) Universitat de Barcelona Martí i Franquès 1 08028 Barcelona Spain
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8
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Lu J, Zhu B, Sakaki S. O 2 activation by core-shell Ru 13@Pt 42 particles in comparison with Pt 55 particles: a DFT study. RSC Adv 2020; 10:36090-36100. [PMID: 35517069 PMCID: PMC9057003 DOI: 10.1039/d0ra05738j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 09/03/2020] [Indexed: 11/21/2022] Open
Abstract
The reaction of O2 with a Ru13@Pt42 core-shell particle consisting of a Ru13 core and a Pt42 shell was theoretically investigated in comparison with Pt55. The O2 binding energy with Pt55 is larger than that with Ru13@Pt42, and O-O bond cleavage occurs more easily with a smaller activation barrier (E a) on Pt55 than on Ru13@Pt42. Protonation to the Pt42 surface followed by one-electron reduction leads to the formation of an H atom on the surface with considerable exothermicity. The H atom reacts with the adsorbed O2 molecule to afford an OOH species with a larger E a value on Pt55 than on Ru13@Pt42. An OOH species is also formed by protonation of the adsorbed O2 molecule, followed by one-electron reduction, with a large exothermicity in both Pt55 and Ru13@Pt42. O-OH bond cleavage occurs with a smaller E a on Pt55 than on Ru13@Pt42. The lower reactivity of Ru13@Pt42 than that of Pt55 on the O-O and O-OH bond cleavages arises from the presence of lower energy in the d-valence band-top and d-band center in Ru13@Pt42 than in Pt55. The smaller E a for OOH formation on Ru13@Pt42 than on Pt55 arises from weaker Ru13@Pt42-O2 and Ru13@Pt42-H bonds than the Pt55-O2 and Pt55-H bonds, respectively. The low-energy d-valence band-top is responsible for the weak Ru13@Pt42-O and Ru13@Pt42-OH bonds. Thus, the low-energy d-valence band-top and d-band center are important properties of the Ru13@Pt42 particle.
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Affiliation(s)
- Jing Lu
- Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University Wuhan 430200 China
| | - Bo Zhu
- Element Strategy Initiative for Catalysts and Batteries, Kyoto University Goryo-Ohara 1-30, Nishikyo-ku Kyoto 615-8245 Japan +81-75-383-3047 +81-75-383-3036
| | - Shigeyoshi Sakaki
- Element Strategy Initiative for Catalysts and Batteries, Kyoto University Goryo-Ohara 1-30, Nishikyo-ku Kyoto 615-8245 Japan +81-75-383-3047 +81-75-383-3036.,Fukui Institute for Fundamental Chemistry (FIFC), Kyoto University Takano-Nishihiraki-cho 34-4, Sakyou-ku Kyoto 606-8103 Japan
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9
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Dávila López AC, Pehlke E. DFT study of Au self-diffusion on Au(001) in the presence of a Cl adlayer. J Chem Phys 2019. [DOI: 10.1063/1.5113965] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
| | - Eckhard Pehlke
- Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
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10
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Partanen L, Murdachaew G, Laasonen K. Oxygen Evolution Reaction Kinetic Barriers on Nitrogen-Doped Carbon Nanotubes. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2018; 122:12892-12899. [PMID: 30405870 PMCID: PMC6203181 DOI: 10.1021/acs.jpcc.8b03269] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 05/21/2018] [Indexed: 05/17/2023]
Abstract
We investigate kinetic barriers for the oxygen evolution reaction (OER) on singly and doubly nitrogen-doped single-walled carbon nanotubes (NCNTs) using the climbing image nudged elastic band method with solvent effects represented by a 45-water-molecule droplet. The studied sites were chosen based on a previous study of the same systems utilizing a thermodynamic model which ignored both solvent effects and kinetic barriers. According to that model, the two studied sites, one on a singly nitrogen-doped CNT and the other on a doubly doped CNT, were approximately equally suitable for OER. For the four-step OER process, however, our reaction barrier calculations showed a clear difference in the rate-determining *OOH formation step between the two systems, with barrier heights differing by more than 0.4 eV. Thus, the simple thermodynamic model may alone be insufficient for identifying optimal OER sites. Of the remaining three reaction steps, the two H2O forming ones were found to be barrierless in all cases. We also performed solvent-free barrier calculations on NCNTs and undoped CNTs. Substantial differences were observed in the energies of the intermediates when the solvent was present. In general, the observed low activation energy barriers for these reactions corroborate both experimental and theoretical findings of the utility of NCNTs for OER catalysis.
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11
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Iyemperumal SK, Deskins NA. Evaluating Solvent Effects at the Aqueous/Pt(111) Interface. Chemphyschem 2017; 18:2171-2190. [DOI: 10.1002/cphc.201700162] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 04/11/2017] [Indexed: 11/08/2022]
Affiliation(s)
| | - N. Aaron Deskins
- Department of Chemical Engineering Worcester Polytechnic Institute Massachusetts 01609 USA
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12
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He ZD, Hanselman S, Chen YX, Koper MTM, Calle-Vallejo F. Importance of Solvation for the Accurate Prediction of Oxygen Reduction Activities of Pt-Based Electrocatalysts. J Phys Chem Lett 2017; 8:2243-2246. [PMID: 28514862 DOI: 10.1021/acs.jpclett.7b01018] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Affiliation(s)
- Zheng-Da He
- Leiden Institute of Chemistry, Leiden University , P.O. Box 9502, 2300 RA Leiden, The Netherlands
- Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Selwyn Hanselman
- Leiden Institute of Chemistry, Leiden University , P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Yan-Xia Chen
- Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Marc T M Koper
- Leiden Institute of Chemistry, Leiden University , P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Federico Calle-Vallejo
- Leiden Institute of Chemistry, Leiden University , P.O. Box 9502, 2300 RA Leiden, The Netherlands
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13
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Calle-Vallejo F, Krabbe A, García-Lastra JM. How covalence breaks adsorption-energy scaling relations and solvation restores them. Chem Sci 2017; 8:124-130. [PMID: 28451156 PMCID: PMC5308396 DOI: 10.1039/c6sc02123a] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 08/05/2016] [Indexed: 12/22/2022] Open
Abstract
It is known that breaking the scaling relations between the adsorption energies of *O, *OH, and *OOH is paramount in catalyzing more efficiently the reduction of O2 in fuel cells and its evolution in electrolyzers. Taking metalloporphyrins as a case study, we evaluate here the adsorption energies of those adsorbates on the metal centers Cr, Mn, Fe, Co, Ni and Cu, using H, F, OH, NH2, CH3, and BH2 as ring ligands. We show that covalence systematically breaks scaling relations under vacuum by strengthening certain M-OOH bonds. However, covalence modifies adsorbate solvation in solution depending on the degree of covalence of the metal-adsorbate bonds. The two effects have similar magnitudes and opposite signs, such that scaling relations are restored in solution. Thus, solvation is a crucial ingredient that must be taken into account in studies aimed at breaking scaling relations in solution. Our findings suggest that the choice of metal and ligand determines the catalytic activity within the limits imposed by scaling relations, whereas the choice of an appropriate solvent can drive such activity beyond those limits.
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Affiliation(s)
- Federico Calle-Vallejo
- Leiden Institute of Chemistry , Leiden University , Einsteinweg 55 , 2333 CC Leiden , The Netherlands .
| | - Alexander Krabbe
- Department of Energy Conversion & Storage , Technical University of Denmark , Fysikvej 309, DK-2800 Kongens Lyngby , Denmark .
| | - Juan M García-Lastra
- Department of Energy Conversion & Storage , Technical University of Denmark , Fysikvej 309, DK-2800 Kongens Lyngby , Denmark .
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14
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Montemore MM, Andreussi O, Medlin JW. Hydrocarbon adsorption in an aqueous environment: A computational study of alkyls on Cu(111). J Chem Phys 2016; 145:074702. [PMID: 27544118 DOI: 10.1063/1.4961027] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Hydrocarbon chains are important intermediates in various aqueous-phase surface processes, such as CO2 electroreduction, aqueous Fischer-Tropsch synthesis, and aqueous phase reforming of biomass-derived molecules. Further, the interaction between water and adsorbed hydrocarbons represents a difficult case for modern computational methods. Here, we explore various methods for calculating the energetics of this interaction within the framework of density functional theory and explore trade-offs between the use of low water coverages, molecular dynamics approaches, and minima hopping for identification of low energy structures. An effective methodology for simulating low temperature processes is provided by using a unit cell in which the vacuum space is filled with water, employing the minima hopping algorithm to search for low-lying minima, and including dispersion (van der Waals) interactions. Using this methodology, we show that a high coverage of adsorbed alkyls is destabilized by the presence of water, while a low coverage of alkyls is stabilized. Solvation has a small effect on the energetics of hydrocarbon chain growth, generally decreasing its favorability at low temperatures. We studied higher temperatures by running molecular dynamics simulations starting at the minima found by the minima hopping algorithm and found that increased temperatures facilitate chain growth. The self-consistent continuum solvation method effectively describes the alkyl-water interaction and is in general agreement with the explicit solvation results in most cases, but care should be taken at high alkyl coverage.
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Affiliation(s)
- Matthew M Montemore
- Department of Mechanical Engineering, University of Colorado Boulder, UCB 427, Boulder, Colorado 80309, USA
| | - Oliviero Andreussi
- Faculty of Informatics, Institute of Computational Science, Università della Svizzera Italiana, Via G. Buffi 13, 6904 Lugano, Switzerland
| | - J Will Medlin
- Department of Chemical and Biological Engineering, University of Colorado Boulder, UCB 596, Boulder, Colorado 80309, USA
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15
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On the oxygen reduction reaction in phosphoric acid electrolyte: Evidence of significantly increased inhibition at steady state conditions. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.04.065] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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The colloidal tool-box approach for fuel cell catalysts: Systematic study of perfluorosulfonate-ionomer impregnation and Pt loading. Catal Today 2016. [DOI: 10.1016/j.cattod.2015.09.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Alvim RS, Lima FCDA, Sánchez VM, Headen TF, Boek ES, Miranda CR. Adsorption of asphaltenes on the calcite (10.4) surface by first-principles calculations. RSC Adv 2016. [DOI: 10.1039/c6ra19307b] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
While the asphaltene-resin dimer leads to π–π stacking outward from surface, sulphide group favors this nanoaggregate adsorption on calcite that is energetically similar to the asphaltene monomer adsorbed through less steric and dielectric effects.
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Affiliation(s)
- Raphael S. Alvim
- Centro de Ciências Naturais e Humanas
- Universidade Federal do ABC
- Santo André
- Brazil
- Departamento de Física dos Materiais e Mecânica
| | - Filipe C. D. A. Lima
- Departamento de Física dos Materiais e Mecânica
- Universidade de São Paulo
- São Paulo
- Brazil
| | - Verónica M. Sánchez
- Centro de Ciências Naturais e Humanas
- Universidade Federal do ABC
- Santo André
- Brazil
- CSC
| | - Thomas F. Headen
- ISIS Neutron and Muon Source
- Rutherford Appleton Laboratory
- Didcot
- UK
| | - Edo S. Boek
- Department of Chemistry
- University of Cambridge
- UK
| | - Caetano R. Miranda
- Centro de Ciências Naturais e Humanas
- Universidade Federal do ABC
- Santo André
- Brazil
- Departamento de Física dos Materiais e Mecânica
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18
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Sementa L, Andreussi O, Goddard III WA, Fortunelli A. Catalytic activity of Pt38 in the oxygen reduction reaction from first-principles simulations. Catal Sci Technol 2016. [DOI: 10.1039/c6cy00750c] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Mechanism of OHads/Pt38 diffusion via transient hydronium species in first-principles molecular dynamics simulations.
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Affiliation(s)
- Luca Sementa
- CNR-ICCOM
- Consiglio Nazionale delle Ricerche
- I-56124 Pisa
- Italy
| | | | | | - Alessandro Fortunelli
- CNR-ICCOM
- Consiglio Nazionale delle Ricerche
- I-56124 Pisa
- Italy
- Materials and Process Simulation Center
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Xiaohui W, Lu L, Pei T, Meixian L, Zujin S. Influence of nitrogen precursors on the structure, composition, and oxygen reduction reaction performance of dual heteroatom doped carbon nanohorns. RSC Adv 2016. [DOI: 10.1039/c6ra14219b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The different N-sources used in the synthesis would cause different ways the doped N atoms interact with B or P dopants, and result in the enhanced or declined electrocatalytic activity of dual-doped carbon nanohorns in oxygen reduction reaction.
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Affiliation(s)
- Wu Xiaohui
- Beijing National Laboratory for Molecular Sciences
- State Key Lab of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Liu Lu
- Institute of Analytical Chemistry
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
- P. R. China
| | - Tang Pei
- Beijing National Laboratory for Molecular Sciences
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
- P. R. China
| | - Li Meixian
- Institute of Analytical Chemistry
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
- P. R. China
| | - Shi Zujin
- Beijing National Laboratory for Molecular Sciences
- State Key Lab of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
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20
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Fortunelli A, Goddard WA, Sementa L, Barcaro G, Negreiros FR, Jaramillo-Botero A. The atomistic origin of the extraordinary oxygen reduction activity of Pt 3Ni 7 fuel cell catalysts. Chem Sci 2015; 6:3915-3925. [PMID: 29218162 PMCID: PMC5707479 DOI: 10.1039/c5sc00840a] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2015] [Accepted: 04/22/2015] [Indexed: 12/01/2022] Open
Abstract
Recently Debe et al. reported that Pt3Ni7 leads to extraordinary Oxygen Reduction Reaction (ORR) activity. However, several reports show that hardly any Ni remains in the layers of the catalysts close to the surface ("Pt-skin effect"). This paradox that Ni is essential to the high catalytic activity with the peak ORR activity at Pt3Ni7 while little or no Ni remains close to the surface is explained here using large-scale first-principles-based simulations. We make the radical assumption that processing Pt-Ni catalysts under ORR conditions would leach out all Ni accessible to the solvent. To simulate this process we use the ReaxFF reactive force field, starting with random alloy particles ranging from 50% Ni to 90% Ni and containing up to ∼300 000 atoms, deleting the Ni atoms, and equilibrating the resulting structures. We find that the Pt3Ni7 case and a final particle radius around 7.5 nm lead to internal voids in communication with the exterior, doubling the external surface footprint, in fair agreement with experiment. Then we examine the surface character of these nanoporous systems and find that a prominent feature in the surface of the de-alloyed particles is a rhombic structure involving 4 surface atoms which is crystalline-like but under-coordinated. Using density-functional theory, we calculate the energy barriers of ORR steps on Pt nanoporous catalysts, focusing on the Oad-hydration reaction (Oad + H2Oad → OHad + OHad) but including the barriers of O2 dissociation (O2ad → Oad + Oad) and water formation (OHad + Had → H2Oad). We find that the reaction barrier for the Oad-hydration rate-determining-step is reduced significantly on the de-alloyed surface sites compared to Pt(111). Moreover we find that these active sites are prevalent on the surface of particles de-alloyed from a Pt-Ni 30 : 70 initial composition. These simulations explain the peak in surface reactivity at Pt3Ni7, and provide a rational guide to use for further optimization of improved catalytic and nanoporous materials.
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Affiliation(s)
- Alessandro Fortunelli
- CNR-ICCOM and IPCF , Consiglio Nazionale delle Ricerche , via Giuseppe Moruzzi 1 , 56124 , Pisa , Italy . ;
- Materials and Process Simulation Center (MC 139-74) , California Institute of Technology , Pasadena , California 91125 , USA .
| | - William A Goddard
- Materials and Process Simulation Center (MC 139-74) , California Institute of Technology , Pasadena , California 91125 , USA .
| | - Luca Sementa
- CNR-ICCOM and IPCF , Consiglio Nazionale delle Ricerche , via Giuseppe Moruzzi 1 , 56124 , Pisa , Italy . ;
| | - Giovanni Barcaro
- CNR-ICCOM and IPCF , Consiglio Nazionale delle Ricerche , via Giuseppe Moruzzi 1 , 56124 , Pisa , Italy . ;
| | - Fabio R Negreiros
- CNR-ICCOM and IPCF , Consiglio Nazionale delle Ricerche , via Giuseppe Moruzzi 1 , 56124 , Pisa , Italy . ;
| | - Andrés Jaramillo-Botero
- Materials and Process Simulation Center (MC 139-74) , California Institute of Technology , Pasadena , California 91125 , USA .
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21
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Fortunelli A, Goddard WA, Sementa L, Barcaro G. Optimizing the oxygen evolution reaction for electrochemical water oxidation by tuning solvent properties. NANOSCALE 2015; 7:4514-4521. [PMID: 25682836 DOI: 10.1039/c4nr07277d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Electrochemical water-based energy cycles provide a most promising alternative to fossil-fuel sources of energy. However, current electrocatalysts are not adequate (high overpotential, lack of selectivity toward O2 production, catalyst degradation). We propose here mechanistic guidelines for experimental examination of modified catalysts based on the dependence of kinetic rates on the solvent dielectric constant. To illustrate the procedure we consider the fcc(111) platinum surface and show that the individual steps for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) change systematically with the polarizability of the medium. Thus changing this environmental variable can be used to tune the rate determining steps and the barriers, providing a means for screening and validating new systems to optimize the rate determining steps for the ORR and OER reaction pathways.
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Affiliation(s)
- Alessandro Fortunelli
- CNR-ICCOM and IPCF, Consiglio Nazionale delle Ricerche, via Giuseppe Moruzzi 1, 56124, Pisa, Italy
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22
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Sun Z, Wang Q, Xu Y, Wang Z. A computationally designed titanium-mediated amination of allylic alcohols for the synthesis of secondary allylamines. RSC Adv 2015. [DOI: 10.1039/c5ra18503c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A direct amination on allylic alcohols under mild conditions was enlightened by computational investigations and implemented in secondary allylamines synthesis.
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Affiliation(s)
- Zunming Sun
- State Key Laboratory and Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Qingxia Wang
- State Key Laboratory and Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Yi Xu
- State Key Laboratory and Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Zhihong Wang
- State Key Laboratory and Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- China
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