1
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Iqbal A, Skulason E, Abghoui Y. Electrochemical Nitrogen Reduction to Ammonia at Ambient Condition on the (111) Facets of Transition Metal Carbonitrides. Chemphyschem 2024; 25:e202300991. [PMID: 38568155 DOI: 10.1002/cphc.202300991] [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: 12/27/2023] [Revised: 03/21/2024] [Indexed: 05/15/2024]
Abstract
We conducted Density Functional Theory calculations to investigate a class of materials with the goal of enabling nitrogen activation and electrochemical ammonia production under ambient conditions. The source of protons at the anode could originate from either water splitting or H2, but our specific focus was on the cathode reaction, where nitrogen is reduced into ammonia. We examined the conventional associative mechanism, dissociative mechanism, and Mars-van Krevelen mechanism on the (111) facets of the NaCl-type structure found in early transition metal carbonitrides, including Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, Sc, Y, and W. We explored the catalytic activity by calculating the free energy of all intermediates along the reaction pathway and constructing free energy diagrams to identify the steps that determine the reaction's feasibility. Additionally, we closely examined the potential for catalyst poisoning within the electrochemical environment, considering the bias required to drive the reaction. Furthermore, we assessed the likelihood of catalyst decomposition and the potential for catalyst regeneration among the most intriguing carbonitrides. Our findings revealed that the only carbonitride catalyst considered here exhibiting both activity and stability, capable of self-regeneration and nitrogen-to-ammonia activation, is NbCN with a low potential-determining step energy of 0.58 eV. This material can facilitate ammonia formation via a mixed associative-MvK mechanism. In contrast, other carbonitrides of this crystallographic orientation are likely to undergo decomposition, reverting to their parent metals under operational conditions.
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Affiliation(s)
- Atef Iqbal
- Science Institute of the University of Iceland
| | - Egill Skulason
- Faculty of Industrial Engineering, Mechanical Engineering and Computer Science, University of Iceland
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2
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Shen A, Liu X, Li H, Duan Y. DFT study of mercury adsorption on Al 2O 3 with presence of HCl. J Mol Graph Model 2023; 124:108548. [PMID: 37352722 DOI: 10.1016/j.jmgm.2023.108548] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 05/20/2023] [Accepted: 06/11/2023] [Indexed: 06/25/2023]
Abstract
mercury emission control from flue gas is a crucial issue for environment protection. Alumina is an important alkali metal oxide for mercury adsorption in particulate, meanwhile is the potential adsorbent for mercury removal. The cognition on mercury heterogeneous reaction mechanism with alumina in presence of hydrogen chloride is inadequate. In this work, the DFT calculation was applied to detect mercury's chlorides adsorption on α-Al2O3 (001) surface, the Bader charge analysis was used to estimate electron transfer and the transition state theory was used to clarify reaction pathway and energy barrier, besides, the kinetic analysis based on Gibbs free energy was conducted to study the impact of temperature on chemical reaction. The results show that Hg can be captured by weak chemisorption on α-Al2O3 (001) surface with the adsorption energy of -56.37 kJ/mol, HgCl, HgCl2 are intensively bonded on surface with adsorption energies of -276.90 kJ/mol and -231.87 kJ/mol, the surface unsaturated Al and O atoms are the active sites. Charge transfer and PDOS analysis prove that the forming of covalent bonding is responsible for Hg species adsorption. Two possible reaction pathways of Hg oxidization to HgCl2 are discussed, in which a smaller energy barrier of 0.1 eV implies the dominant pathway 1 via Eley-Rideal mechanism: two adsorbed HCl molecules dissociate on surface and then react with one Hg atom. High temperature can promote the reaction rate constants of pathway 1 and 2, but is only favorable for reducing energy barrier of pathway 2.
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Affiliation(s)
- Ao Shen
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu Province, China
| | - Xiaoshuo Liu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu Province, China
| | - Haiyang Li
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu Province, China
| | - Yufeng Duan
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu Province, China.
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3
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Ngo HM, Pal U, Kang YS, Ok KM. DFT-Based Study for the Enhancement of CO 2 Adsorption on Metal-Doped Nitrogen-Enriched Polytriazines. ACS OMEGA 2023; 8:8876-8884. [PMID: 36910961 PMCID: PMC9996777 DOI: 10.1021/acsomega.3c00395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
Nitrogen-enriched polytriazine (NPT), a carbon nitride-based material, has received much attention for CO2 storage applications. However, to enhance the CO2 uptake capacity more efficiently, it is necessary to understand the interaction mechanism between CO2 molecules and NPT through appropriate modification of the structures. Here, we introduce a method to enhance the CO2 adsorption capacity of NPT by incorporating metal atoms such as Sn, Co, and Ni into the polytriazine network. DFT calculations were used to investigate the CO2 adsorption mechanism of the polytriazine frameworks by tracking the interactions between CO2 and the various interaction sites of NPT. By optimizing the geometry of the pure and metal-containing NPT frameworks, we calculated the binding energy of metal atoms in the NPT framework, the adsorption energy of CO2 molecules, and the charge transfer between CO2 molecules and the corresponding adsorption systems. In this work, we demonstrate that the CO2 adsorption capacity of NPT can be greatly enhanced by doping transition-metal atoms into the cavities of NPT.
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Affiliation(s)
- Hieu Minh Ngo
- Department
of Chemistry, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Republic
of Korea
| | - Umapada Pal
- Institute
of Physics, Autonomous University of Puebla, P.O. Box. J-48, Puebla, Pue 72570 Mexico
| | - Young Soo Kang
- Department
of Environmental and Climate Technology, Korea Institute of Energy Technology, Naju-si, Jeollanam do 58217, Republic of Korea
| | - Kang Min Ok
- Department
of Chemistry, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Republic
of Korea
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4
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Fu W, Wan J, Zhang H, Li J, Chen W, Li Y, Guo Z, Wang Y. Photoinduced loading of electron-rich Cu single atoms by moderate coordination for hydrogen evolution. Nat Commun 2022; 13:5496. [PMID: 36127356 PMCID: PMC9489781 DOI: 10.1038/s41467-022-33275-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 09/12/2022] [Indexed: 11/30/2022] Open
Abstract
Single-atom catalysts offer maximal atom utilization efficiencies and high-electronegativity heteroatoms play a crucial role in coordinating reactive single metal atoms to prevent agglomeration. However, these strong coordination bonds withdraw electron density for coordinated metal atoms and consequently affect their catalytic activity. Herein we reveal the high loading (11.3 wt%) and stabilization of moderately coordinated Cu-P3 structure on black phosphorus support by a photochemical strategy with auxiliary hydrogen. Single-atom Cu sites with an exceptional electron-rich feature show the \documentclass[12pt]{minimal}
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\begin{document}$$\triangle {G}_{{{{{{\rm{H}}}}}}*}$$\end{document}△GH* close to zero to favor catalysis. Neighboring Cu atoms work in synergy to lower the energy of key water adsorption and dissociation intermediates. The reported catalyst shows a low overpotential of only 41 mV at 10 mA cm−2 and Tafel slope of 53.4 mV dec−1 for the alkaline hydrogen evolution reaction, surpassing both isolated Cu single atoms and Cu nanoclusters. The promising materials design strategy sheds light on the design and fabrication of high-loading single metal atoms and the role of neighboring single atoms for enhanced reaction kinetics. While atomically dispersed metals can maximize reaction catalytic sites, it is challenging to achieve high atomic densities without agglomeration. Here, authors prepared Cu single-atoms on black phosphorous using a photochemical strategy and auxiliary H2 as proton reduction electrocatalysts.
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Affiliation(s)
- Weiwei Fu
- The School of Chemistry and Chemical Engineering, State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, PR China
| | - Jin Wan
- The School of Chemistry and Chemical Engineering, State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, PR China
| | - Huijuan Zhang
- The School of Chemistry and Chemical Engineering, State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, PR China
| | - Jian Li
- The school of Electrical Engineering, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, China
| | - Weigen Chen
- The school of Electrical Engineering, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, China
| | - Yuke Li
- Department of Chemistry, Centre for Scientific Modeling and Computation, Chinese University of Hong Kong, Shatin, 999077, Hong Kong
| | - Zaiping Guo
- School of Chemical Engineering and Advanced Materials, University of Adelaide, Adelaide, 5005, Australia
| | - Yu Wang
- The School of Chemistry and Chemical Engineering, State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, PR China. .,The school of Electrical Engineering, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, China.
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5
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Höskuldsson ÁB, Tayyebi E, Skúlason E. Computational examination of the kinetics of electrochemical nitrogen reduction and hydrogen evolution on a tungsten electrode. J Catal 2021. [DOI: 10.1016/j.jcat.2021.10.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Pangh A. Catalytic cleavage of CO2 on bimetallic Ni4M (M = Ni, Mo, Sc, and Y) nanoclusters: A DFT study. CATAL COMMUN 2021. [DOI: 10.1016/j.catcom.2020.106245] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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7
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Ávila M, Juárez MF, Santos E. Role of the Partial Charge Transfer on the Chloride Adlayers on Au(100). ChemElectroChem 2020. [DOI: 10.1002/celc.202001228] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Milagros Ávila
- Instituto de Física Enrique Gaviola (IFEG-CONICET) Universidad Nacional de Córdoba Argentina
| | - María F. Juárez
- Institute of Theoretical Chemistry Ulm University Albert-Einstein-Allée 11 89081 Ulm Germany
| | - Elizabeth Santos
- Instituto de Física Enrique Gaviola (IFEG-CONICET) Universidad Nacional de Córdoba Argentina
- Institute of Theoretical Chemistry Ulm University Albert-Einstein-Allée 11 89081 Ulm Germany
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8
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Li M, Cui Y, Sun L, Zhang X, Peng L, Huang Y. Boosting Electrocatalytic N2 Reduction to NH3 over Two-Dimensional Gallium Selenide by Defect-Size Engineering. Inorg Chem 2020; 59:4858-4867. [DOI: 10.1021/acs.inorgchem.0c00131] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Mengyuan Li
- College of Chemistry and Material Science, Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, Anhui Normal University, Wuhu 241000, People’s Republic of China
| | - Yu Cui
- College of Chemistry and Material Science, Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, Anhui Normal University, Wuhu 241000, People’s Republic of China
| | - Liping Sun
- College of Chemistry and Material Science, Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, Anhui Normal University, Wuhu 241000, People’s Republic of China
| | - Xiaoli Zhang
- College of Chemistry and Material Science, Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, Anhui Normal University, Wuhu 241000, People’s Republic of China
| | - Lei Peng
- College of Chemistry and Material Science, Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, Anhui Normal University, Wuhu 241000, People’s Republic of China
| | - Yucheng Huang
- College of Chemistry and Material Science, Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, Anhui Normal University, Wuhu 241000, People’s Republic of China
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9
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Tayyebi E, Abghoui Y, Skúlason E. Elucidating the Mechanism of Electrochemical N2 Reduction at the Ru(0001) Electrode. ACS Catal 2019. [DOI: 10.1021/acscatal.9b03903] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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10
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Chernyshova IV, Ponnurangam S. Activation of CO2 at the electrode–electrolyte interface by a co-adsorbed cation and an electric field. Phys Chem Chem Phys 2019; 21:8797-8807. [DOI: 10.1039/c8cp07807f] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Electric polarization by the local microenvironment strongly affects the CO2 activation at the electrode–electrolyte interface.
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Affiliation(s)
- Irina V. Chernyshova
- Department of Earth and Environmental Engineering
- Columbia University
- New York
- USA
- Department of Geoscience and Petroleum
| | - Sathish Ponnurangam
- Department of Chemical and Petroleum Engineering
- University of Calgary
- Calgary
- Canada
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11
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Rice PS, Mao Y, Guo C, Hu P. Interconversion of hydrated protons at the interface between liquid water and platinum. Phys Chem Chem Phys 2019; 21:5932-5940. [DOI: 10.1039/c8cp07511e] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The free energy barriers for hydrogen transfer at the H2O/Pt(111) interface calculated usingab initiomolecular dynamics and umbrella sampling.
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Affiliation(s)
- Peter S. Rice
- School of Chemistry and Chemical Engineering
- The Queen's University of Belfast
- Belfast BT9 5AG
- UK
| | - Yu Mao
- School of Chemistry and Chemical Engineering
- The Queen's University of Belfast
- Belfast BT9 5AG
- UK
| | - Chenxi Guo
- School of Chemistry and Chemical Engineering
- The Queen's University of Belfast
- Belfast BT9 5AG
- UK
| | - P. Hu
- School of Chemistry and Chemical Engineering
- The Queen's University of Belfast
- Belfast BT9 5AG
- UK
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12
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Cho H, Dong Kim W, Yu J, Lee S, Lee DC. Molecule-Driven Shape Control of Metal Co-Catalysts for Selective CO2
Conversion Photocatalysis. ChemCatChem 2018. [DOI: 10.1002/cctc.201801291] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Hyunjin Cho
- Department of Chemical and Biomolecular Engineering, KAIST; Institute for the Nanocentury; Korea Advanced Institute of Science and Technology (KAIST); Daejeon 34141 Republic of Korea
| | - Whi Dong Kim
- Department of Chemical and Biomolecular Engineering, KAIST; Institute for the Nanocentury; Korea Advanced Institute of Science and Technology (KAIST); Daejeon 34141 Republic of Korea
| | - Jiwon Yu
- Department of Chemical Engineering and Materials Science; Ewha Womans University; Seoul 03760 Republic of Korea
| | - Sangheon Lee
- Department of Chemical Engineering and Materials Science; Ewha Womans University; Seoul 03760 Republic of Korea
| | - Doh C. Lee
- Department of Chemical and Biomolecular Engineering, KAIST; Institute for the Nanocentury; Korea Advanced Institute of Science and Technology (KAIST); Daejeon 34141 Republic of Korea
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13
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On the origin of the elusive first intermediate of CO 2 electroreduction. Proc Natl Acad Sci U S A 2018; 115:E9261-E9270. [PMID: 30224482 DOI: 10.1073/pnas.1802256115] [Citation(s) in RCA: 175] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We resolve the long-standing controversy about the first step of the CO2 electroreduction to fuels in aqueous electrolytes by providing direct spectroscopic evidence that the first intermediate of the CO2 conversion to formate on copper is a carboxylate anion *CO2 - coordinated to the surface through one of its C-O bonds. We identify this intermediate and gain insight into its formation, its chemical and electronic properties, as well as its dependence on the electrode potential by taking advantage of a cutting-edge methodology that includes operando surface-enhanced Raman scattering (SERS) empowered by isotope exchange and electrochemical Stark effects, reaction kinetics (Tafel) analysis, and density functional theory (DFT) simulations. The SERS spectra are measured on an operating Cu surface. These results advance the mechanistic understanding of CO2 electroreduction and its selectivity to carbon monoxide and formate.
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14
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Rawat KS, Mahata A, Pathak B. Thermochemical and electrochemical CO 2 reduction on octahedral Cu nanocluster: Role of solvent towards product selectivity. J Catal 2017. [DOI: 10.1016/j.jcat.2017.03.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Hussain J, Jónsson H, Skúlason E. Faraday efficiency and mechanism of electrochemical surface reactions: CO2 reduction and H2 formation on Pt(111). Faraday Discuss 2016; 195:619-636. [DOI: 10.1039/c6fd00114a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An atomic scale model of the electrical double layer is used to calculate the mechanism and rate of electrochemical reduction of CO2 as well as H2 formation at a Pt(111) electrode. The water layer contains solvated protons and the electrode has excess electrons at the surface. Density functional theory within the generalized gradient approximation is used to describe the electronic structure while the mechanism and activation energy of the various elementary reactions is obtained by calculating minimum energy paths using the nudged elastic band method. The applied electrical potential is deduced from the calculated work function. The optimal reaction mechanism for CO2 reduction to either methane or methanol is found and the estimated rate compared with that of the competing reaction, H2 formation. When the free energy of only the intermediates and reactants is taken into account, not the activation energy, Pt(111) would seem to be a good electrocatalyst for CO2 reduction, significantly better than Cu(111). This, however, contradicts experimental findings. Detailed calculations reported here show that the activation energy for CO2 reduction is high for both Heyrovsky and Tafel mechanisms on Pt(111) in the relevant range of applied potential. The rate-limiting step of the Heyrovsky mechanism, *COOH + H+ + e− → *CO + H2O, is estimated to have an activation energy of 0.95 eV at −0.9 V vs. standard hydrogen electrode. Under the same conditions, the activation energy for H2 formation is estimated to be only 0.5 eV. This explains why attempts to reduce CO2 using platinum electrodes have produced only H2. A comparison is made with analogous results for Cu(111) [J. Hussain et al., Procedia Comput. Sci., 2015, 51, 1865] where a reaction mechanism with low activation energy for CO2 electroreduction to methane was identified. The difference between the two electrocatalysts is discussed.
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Affiliation(s)
- Javed Hussain
- Science Institute and Faculty of Physical Sciences
- University of Iceland VR-III
- 107 Reykjavík
- Iceland
| | - Hannes Jónsson
- Science Institute and Faculty of Physical Sciences
- University of Iceland VR-III
- 107 Reykjavík
- Iceland
- Department of Applied Physics
| | - Egill Skúlason
- Science Institute and Faculty of Physical Sciences
- University of Iceland VR-III
- 107 Reykjavík
- Iceland
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16
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Skúlason E. Modeling Electrochemical Reactions at the Solid-liquid Interface Using Density Functional Calculations. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.procs.2015.05.431] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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17
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Tawfik SA, Cui XY, Ringer SP, Stampfl C. Multiple CO2 capture in stable metal-doped graphene: a theoretical trend study. RSC Adv 2015. [DOI: 10.1039/c5ra09876a] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A systematic trend study of carbon dioxide capture on metal-doped single vacancy/double vacancy graphene.
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Affiliation(s)
| | - X. Y. Cui
- Australian Centre for Microscopy and Microanalysis
- School of Aerospace
- Mechanical and Mechatronic Engineering
- The University of Sydney
- Australia
| | - S. P. Ringer
- Australian Centre for Microscopy and Microanalysis
- School of Aerospace
- Mechanical and Mechatronic Engineering
- The University of Sydney
- Australia
| | - C. Stampfl
- School of Physics
- The University of Sydney
- Sydney
- Australia
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18
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Juarez MF, Fuentes S, Soldano GJ, Avalle L, Santos E. Spontaneous formation of metallic nanostructures on highly oriented pyrolytic graphite (HOPG): an ab initio and experimental study. Faraday Discuss 2014; 172:327-47. [DOI: 10.1039/c4fd00047a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have investigated the decoration of step-edges of HOPG by Ag, Au and Pt using experimental and theoretical approaches. Metallic nanowires can be formed on bare or functionalized step-edges. Energy dispersion analysis indicates the presence of oxygenated groups. The experiments showed that nanowires can be obtained with the three metals along the step-edges, but the shapes and morphologies are very different. We have found that the interaction between the metal wires and the carbon follows the sequence: Pt > Au > Ag. The electronic redistribution between the atoms participating in the bond between the metallic nanowire and the step-edges shows a complicated pattern. The density of electronic states projected on the different atoms indicates that there are different orbitals participating in the bonds.
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Affiliation(s)
- Maria F. Juarez
- Institute of Theoretical Chemistry
- Ulm University
- D-89069 Ulm, Germany
| | - Silvina Fuentes
- Facultad de Ciencias Exactas y Naturales
- Universidad Nacional de Catamarca
- Catamarca, Argentina
- Instituto de Fîsica Enrique Gaviola (IFEG-CONICET)
- Facultad de Matemática
| | - Germán J. Soldano
- Institute of Theoretical Chemistry
- Ulm University
- D-89069 Ulm, Germany
| | - Lucia Avalle
- Facultad de Ciencias Exactas y Naturales
- Universidad Nacional de Catamarca
- Catamarca, Argentina
- Instituto de Fîsica Enrique Gaviola (IFEG-CONICET)
- Facultad de Matemática
| | - Elizabeth Santos
- Institute of Theoretical Chemistry
- Ulm University
- D-89069 Ulm, Germany
- Instituto de Fîsica Enrique Gaviola (IFEG-CONICET)
- Facultad de Matemática
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19
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Skúlason E, Faraj AA, Kristinsdóttir L, Hussain J, Garden AL, Jónsson H. Catalytic Activity of Pt Nano-Particles for H2 Formation. Top Catal 2013. [DOI: 10.1007/s11244-013-0182-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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20
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Gudmundsdóttir S, Skúlason E, Weststrate KJ, Juurlink L, Jónsson H. Hydrogen adsorption and desorption at the Pt(110)-(1×2) surface: experimental and theoretical study. Phys Chem Chem Phys 2013; 15:6323-32. [DOI: 10.1039/c3cp44503h] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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