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Estejab A, García Cárcamo RA, Getman RB. Influence of an electrified interface on the entropy and energy of solvation of methanol oxidation intermediates on platinum(111) under explicit solvation. Phys Chem Chem Phys 2022; 24:4251-4261. [PMID: 35107094 DOI: 10.1039/d1cp05358b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Liquid water and electric fields play significant roles in phenomena occurring at catalytic and electrocatalytic interfaces; however, how their interplay influences interfacial energetics remains uncertain. Electric fields control the orientations of water molecules, which we hypothesized would influence the solvation thermodynamics of surface species. To explore this hypothesis, we used multiscale simulations involving density functional theory and classical molecular dynamics. We computed the energies and entropies of solvation of surface species on Pt(111), specifically, adsorbed CH3OH, COH, and CO, which are intermediates in the pathway of methanol oxidation, in the presence of electric fields spanning -0.5 to +0.5 V Å-1. We found that both the energy and entropy of solvation depend on the strength and direction of the field, with the entropy of solvation being significantly impacted. Both the energy and entropy dependence on the field can be ascribed to water molecule orientations. Specifically, more positive fields orient water molecules so that they can more effectively hydrogen bond with surface species, which strengthens the energies of solvation. However, at more negative fields, competition with the surface species causes interfacial water molecules to reorient, which leads to disorder in the water structure and hence increased entropy.
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Affiliation(s)
- Ali Estejab
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC 29634-0909, USA.
| | - Ricardo A García Cárcamo
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC 29634-0909, USA.
| | - Rachel B Getman
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC 29634-0909, USA.
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Wei RL, Liu Y, Chen Z, Jia WS, Yang YY, Cai WB. Ammonia oxidation on iridium electrode in alkaline media: An in situ ATR-SEIRAS study. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115254] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Grossman EF, Daramola DA, Botte GG. Comparing B3LYP and B97 Dispersion-corrected Functionals for Studying Adsorption and Vibrational Spectra in Nitrogen Reduction. ChemistryOpen 2021; 10:316-326. [PMID: 33434349 PMCID: PMC7953478 DOI: 10.1002/open.202000158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 12/20/2020] [Indexed: 11/10/2022] Open
Abstract
Electrochemical ammonia synthesis is being actively studied as a low temperature, low pressure alternative to the Haber-Bosch process. This work studied pure iridium as the catalyst for ammonia synthesis, following promising experimental results of Pt-Ir alloys. The characteristics studied include bond energies, bond lengths, spin densities, and free and adsorbed vibrational frequencies for the molecules N2 , N, NH, NH2 , and NH3 . Overall, these descriptive characteristics explore the use of dispersion-corrected density functional theory methods that can model N2 adsorption - the key reactant for electrochemical ammonia synthesis via transition metal catalysis. Specifically, three methods were tested: hybrid B3LYP, a dispersion-corrected form B3LYP-D3, and semi-empirical B97-D3. The latter semi-empirical method was explored to increase the accuracy obtained in vibrational analysis as well as reduce computational time. Two lattice surfaces, (111) and (100), were compared. The adsorption energies are stronger on (100) and follow the trend EB3LYP >EB3LYP-D3 >EB97-D3 on both surfaces.
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Affiliation(s)
- Esther F. Grossman
- Department of Physics and AstronomyCenter for Electrochemical Engineering ResearchOhio UniversityAthensOH 45701USA
| | - Damilola A. Daramola
- Department of Chemical and Biomolecular EngineeringOhio UniversityAthensOH 45701USA
| | - Gerardine G. Botte
- Department of Chemical EngineeringTexas Tech UniversityLubbockTX 79409USA
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Li Y, Wang H, Priest C, Li S, Xu P, Wu G. Advanced Electrocatalysis for Energy and Environmental Sustainability via Water and Nitrogen Reactions. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2000381. [PMID: 32671924 DOI: 10.1002/adma.202000381] [Citation(s) in RCA: 114] [Impact Index Per Article: 38.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 03/23/2020] [Accepted: 04/02/2020] [Indexed: 06/11/2023]
Abstract
Clean and efficient energy storage and conversion via sustainable water and nitrogen reactions have attracted substantial attention to address the energy and environmental issues due to the overwhelming use of fossil fuels. These electrochemical reactions are crucial for desirable clean energy technologies, including advanced water electrolyzers, hydrogen fuel cells, and ammonia electrosynthesis and utilization. Their sluggish reaction kinetics lead to inefficient energy conversion. Innovative electrocatalysis, i.e., catalysis at the interface between the electrode and electrolyte to facilitate charge transfer and mass transport, plays a vital role in boosting energy conversion efficiency and providing sufficient performance and durability for these energy technologies. Herein, a comprehensive review on recent progress, achievements, and remaining challenges for these electrocatalysis processes related to water (i.e., oxygen evolution reaction, OER, and oxygen reduction reaction, ORR) and nitrogen (i.e., nitrogen reduction reaction, NRR, for ammonia synthesis and ammonia oxidation reaction, AOR, for energy utilization) is provided. Catalysts, electrolytes, and interfaces between the two within electrodes for these electrocatalysis processes are discussed. The primary emphasis is device performance of OER-related proton exchange membrane (PEM) electrolyzers, ORR-related PEM fuel cells, NRR-driven ammonia electrosynthesis from water and nitrogen, and AOR-related direct ammonia fuel cells.
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Affiliation(s)
- Yi Li
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Huanhuan Wang
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Cameron Priest
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Siwei Li
- Department MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, China
| | - Ping Xu
- Department MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, China
| | - Gang Wu
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
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Estejab A, Botte GG. Ammonia oxidation kinetics on bimetallic clusters of platinum and iridium: A theoretical approach. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2017.11.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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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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DFT calculations of ammonia oxidation reactions on bimetallic clusters of platinum and iridium. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2016.06.030] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Pelegrini M, Parreira RLT, Ferrão LFA, Caramori GF, Ortolan AO, da Silva EH, Roberto-Neto O, Rocco JAFF, Machado FBC. Hydrazine decomposition on a small platinum cluster: the role of N2H5 intermediate. Theor Chem Acc 2016. [DOI: 10.1007/s00214-016-1816-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Katsounaros I, Chen T, Gewirth AA, Markovic NM, Koper MTM. Evidence for Decoupled Electron and Proton Transfer in the Electrochemical Oxidation of Ammonia on Pt(100). J Phys Chem Lett 2016; 7:387-392. [PMID: 26757266 DOI: 10.1021/acs.jpclett.5b02556] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The two traditional mechanisms of the electrochemical ammonia oxidation consider only concerted proton-electron transfer elementary steps and thus they predict that the rate-potential relationship is independent of the pH on the pH-corrected RHE potential scale. In this letter we show that this is not the case: the increase of the solution pH shifts the onset of the NH3-to-N2 oxidation on Pt(100) to lower potentials and also leads to higher surface concentration of formed NOad before the latter is oxidized to nitrite. Therefore, we present a new mechanism for the ammonia oxidation that incorporates a deprotonation step occurring prior to the electron transfer. The deprotonation step yields a negatively charged surface-adsorbed species that is discharged in a subsequent electron transfer step before the N-N bond formation. The negatively charged species is thus a precursor for the formation of N2 and NO. The new mechanism should be a future guide for computational studies aiming at the identification of intermediates and corresponding activation barriers for the elementary steps. Ammonia oxidation is a new example of a bond-forming reaction on (100) terraces that involves decoupled proton-electron transfer.
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Affiliation(s)
- Ioannis Katsounaros
- University of Illinois at Urbana-Champaign , Department of Chemistry, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
- Argonne National Laboratory , Materials Science Division, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
- Leiden University , Leiden Institute of Chemistry, Einsteinweg 55, P.O. Box 9502, 2300RA Leiden, The Netherlands
| | - Ting Chen
- Leiden University , Leiden Institute of Chemistry, Einsteinweg 55, P.O. Box 9502, 2300RA Leiden, The Netherlands
- Shandong Jianzhu University , School of Science, 250101 Jinan, P. R. China
| | - Andrew A Gewirth
- University of Illinois at Urbana-Champaign , Department of Chemistry, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Nenad M Markovic
- Argonne National Laboratory , Materials Science Division, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
| | - Marc T M Koper
- Leiden University , Leiden Institute of Chemistry, Einsteinweg 55, P.O. Box 9502, 2300RA Leiden, The Netherlands
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Morita S, Kudo E, Shirasaka R, Yonekawa M, Nagai K, Ota H, N.-Gamo M, Shiroishi H. Electrochemical oxidation of ammonia by multi-wall-carbon-nanotube-supported Pt shell–Ir core nanoparticles synthesized by an improved Cu short circuit deposition method. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2015.12.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zhou Y, Zhang G, Gong Z, Shang X, Yang F. Potentiodynamic Uniform Anchoring of Platinum Nanoparticles on N-Doped Graphene with Improved Mass Activity for the Electrooxidation of Ammonia. ChemElectroChem 2016. [DOI: 10.1002/celc.201500478] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yufei Zhou
- Key Laboratory of Industrial Ecology and Environmental Engineering; Ministry of Education, School of Environmental Science and Technology; Dalian University of Technology; Dalian 116024 P.R. China
| | - Guoquan Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering; Ministry of Education, School of Environmental Science and Technology; Dalian University of Technology; Dalian 116024 P.R. China
| | - Zheng Gong
- Key Laboratory of Industrial Ecology and Environmental Engineering; Ministry of Education, School of Environmental Science and Technology; Dalian University of Technology; Dalian 116024 P.R. China
- School of Life Science; Liaoning Normal University; Dalian 116029 P.R. China
| | - Xiuli Shang
- Department of Petrochemical Engineering; Lanzhou Petrochemical College of Vocational Technology; Lanzhou 730060 P.R. China)
| | - Fenglin Yang
- Key Laboratory of Industrial Ecology and Environmental Engineering; Ministry of Education, School of Environmental Science and Technology; Dalian University of Technology; Dalian 116024 P.R. China
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Mathematical modeling of ammonia electrooxidation kinetics in a Polycrystalline Pt rotating disk electrode. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2014.12.162] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Estejab A, Daramola DA, Botte GG. Mathematical model of a parallel plate ammonia electrolyzer for combined wastewater remediation and hydrogen production. WATER RESEARCH 2015; 77:133-145. [PMID: 25864004 DOI: 10.1016/j.watres.2015.03.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 03/04/2015] [Accepted: 03/15/2015] [Indexed: 05/12/2023]
Abstract
A mathematical model was developed for the simulation of a parallel plate ammonia electrolyzer to convert ammonia in wastewater to nitrogen and hydrogen under basic conditions. The model consists of fundamental transport equations, the ammonia oxidation kinetics at the anode, and the hydrogen evolution kinetics at the cathode of the electrochemical reactor. The model shows both qualitative and quantitative agreement with experimental measurements at ammonia concentrations found within wastewater (200-1200 mg L(-1)). The optimum electrolyzer performance is dependent on both the applied voltage and the inlet concentrations. Maximum conversion of ammonia to nitrogen at the rates of 0.569 and 0.766 mg L(-1) min(-1) are achieved at low (0.01 M NH4Cl and 0.1 M KOH) and high (0.07 M NH4Cl and 0.15 M KOH) inlet concentrations, respectively. At high and low concentrations, an initial increase in the cell voltage will cause an increase in the system response - current density generated and ammonia converted. These system responses will approach a peak value before they start to decrease due to surface blockage and/or depletion of solvated species at the electrode surface. Furthermore, the model predicts that by increasing the reactant and electrolyte concentrations at a certain voltage, the peak current density will plateau, showing an asymptotic response.
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Affiliation(s)
- Ali Estejab
- Center for Electrochemical Engineering Research, Department of Chemical and Biomolecular Engineering, Stocker Center 165, Ohio University, Athens, OH 45701, United States
| | - Damilola A Daramola
- Center for Electrochemical Engineering Research, Department of Chemical and Biomolecular Engineering, Stocker Center 165, Ohio University, Athens, OH 45701, United States
| | - Gerardine G Botte
- Center for Electrochemical Engineering Research, Department of Chemical and Biomolecular Engineering, Stocker Center 165, Ohio University, Athens, OH 45701, United States.
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