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Tsakova V. Electrochemistry born in Bulgaria: the wide spread of ripened seeds at the transition to the twenty-first century. J Solid State Electrochem 2023. [DOI: 10.1007/s10008-023-05397-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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2
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Hamze M, Rezaei M, Tabaian SH. Galvanic replacement of Pt by Cu to synthesize highly active and durable Pt@Cu/C anode as oxygen evolution reaction catalyst. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2022.130422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Mohammad Mirzaei, Ghadi A, Fathi S. Preparation of a Modified Electrode Using Electrodeposition of Cu Followed by Galvanic Replacement of Ag: Application for Electrocatalytic Oxidation of Ethylen Glychol. RUSS J ELECTROCHEM+ 2022. [DOI: 10.1134/s1023193522030089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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5
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Touni A, Grammenos OA, Banti A, Karfaridis D, Prochaska C, Lambropoulou D, Pavlidou E, Sotiropoulos S. Iridium oxide-nickel-coated titanium anodes for the oxygen evolution reaction. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138866] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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Themsirimongkon S, Pongpichayakul N, Fang L, Jakmunee J, Saipanya S. New catalytic designs of Pt on carbon nanotube-nickel-carbon black for enhancement of methanol and formic acid oxidation. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114518] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Facile synthesis of alloyed PtNi/CNTs electrocatalyst with enhanced catalytic activity and stability for methanol oxidation. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.108130] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Synthesis of Pt-Ni (trace)/GNs composite and its bi-functional electrocatalytic properties for MOR and ORR. J Colloid Interface Sci 2019; 554:640-649. [DOI: 10.1016/j.jcis.2019.07.052] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 07/16/2019] [Accepted: 07/19/2019] [Indexed: 11/20/2022]
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9
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Touni A, Papaderakis A, Karfaridis D, Vourlias G, Sotiropoulos S. Oxygen Evolution Reaction at IrO 2/Ir(Ni) Film Electrodes Prepared by Galvanic Replacement and Anodization: Effect of Precursor Ni Film Thickness. Molecules 2019; 24:E2095. [PMID: 31159428 PMCID: PMC6600157 DOI: 10.3390/molecules24112095] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Revised: 05/28/2019] [Accepted: 05/29/2019] [Indexed: 11/16/2022] Open
Abstract
IrO2/Ir(Ni) film electrodes of variable Ni content have been prepared via a galvanic replacement method, whereby surface layers of pre-deposited Ni are replaced by Ir, followed by electrochemical anodization. Electrodeposition of Ni on a glassy carbon electrode support has been carried out at constant potential and the charge of electrodeposited Ni controlled so as to investigate the effect of precursor Ni layer thickness on the electrocatalytic activity of the corresponding IrO2/Ir(Ni)/GC electrodes for the oxygen evolution reaction (OER). After their preparation, these electrodes were characterized by microscopic (SEM) and spectroscopic (EDS, XPS) techniques, revealing the formation of Ir deposits on the Ni support and a thin IrO2 layer on their surfaces. To determine the electroactive surface area of the IrO2 coatings, cyclic voltammograms were recorded in the potential range between hydrogen and oxygen evolution and the charge under the anodic part of the curves, corresponding to Ir surface oxide formation, served as an indicator of the quantity of active IrO2 in the film. The electrocatalytic activity of the coatings for OER was investigated by current-potential curves under steady state conditions, revealing that the catalysts prepared from thinner Ni films exhibited enhanced electrocatalytic performance.
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Affiliation(s)
- Aikaterini Touni
- Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
| | - Athanasios Papaderakis
- Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
| | - Dimitrios Karfaridis
- Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
| | - Georgios Vourlias
- Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
| | - Sotirios Sotiropoulos
- Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
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Gruzeł G, Arabasz S, Pawlyta M, Parlinska-Wojtan M. Conversion of bimetallic PtNi 3 nanopolyhedra to ternary PtNiSn nanoframes by galvanic replacement reaction. NANOSCALE 2019; 11:5355-5364. [PMID: 30848274 DOI: 10.1039/c9nr01359h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Hollow multimetallic PtNiSn nanoparticles (NPs) were formed from solid Ni-core/Pt-frame NPs by the galvanic replacement reaction (GRR) of Ni by Sn. The GRR was performed by adding SnCl4·5H2O dissolved in ethylene glycol into the PtNi3 NPs containing suspension. The reaction yielded nanoframes with a hollow interior, having Pt-rich edges covered with a thin, incomplete Sn layer. They were investigated using transmission electron microscopy (TEM), energy dispersion X-ray spectroscopy (EDS) and X-ray diffraction (XRD). EDS analysis showed that the GRR rate could be modified by changing the solvent and the concentration of tin ions. Indeed, compared to water, ethylene glycol was found to facilitate the reduction of tin chloride and to affect nickel dissolution. TEM analysis revealed that the galvanic replacement of nickel and tin involves two different mechanisms. The first one consists of nickel oxidation followed by reduction of tin ions. In the second mechanism, oxidation of nickel and reduction of tin ions occur simultaneously.
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Affiliation(s)
- Grzegorz Gruzeł
- Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland.
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11
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Dimitrova N, Dhifallah M, Mineva T, Boiadjieva-Scherzer T, Guesmi H, Georgieva J. High performance of PtCu@TiO2 nanocatalysts toward methanol oxidation reaction: from synthesis to molecular picture insight. RSC Adv 2019; 9:2073-2080. [PMID: 35516102 PMCID: PMC9059719 DOI: 10.1039/c8ra08782b] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 12/28/2018] [Indexed: 01/30/2023] Open
Abstract
The electrocatalytic production of hydrogen from methanol dehydrogenation successfully uses platinum catalysts. However, they are expensive and Pt has the tendency to be poisoned from the intermediate compounds, formed during the methanol oxidation reaction (MOR). For these two reasons, there has been active research for alternative bi- and tri-component Pt-based catalysts. Herein, PtCu nanoparticles deposited on titania were studied and proposed to be efficient MOR catalysts. The catalyst was prepared by photo-deposition of Cu on a high-surface-area TiO2 powder support, followed by a partial galvanic displacement of the Cu deposit by platinum. The morphology and structure of the catalyst were characterized by physicochemical methods. The PtCu@TiO2 electro-catalyst has higher intrinsic catalytic activity and comparable mass specific activity for MOR in comparison with a commercial Pt/C catalyst. The experimental analyses were complemented by density functional theory-based computations. The theoretical results revealed that the most energetically favorable Pt and Cu arrangement in the supported PtCu nanoparticles was core (Cu)–shell (Pt) and/or phase-separated. The inter-atomic interactions responsible for the bimetallic cluster stabilization on titania were highlighted from the computed electronic charge distribution. Computed adhesion energies of pure and bimetallic PtCu clusters (regular alloy, phase-separated, core–shell) on TiO2 anatase support.![]()
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Affiliation(s)
- Nina Dimitrova
- Rostislaw Kaischew Institute of Physical Chemistry
- Bulgarian Academy of Sciences
- Sofia 1113
- Bulgaria
| | - Marwa Dhifallah
- Institut Charles Gerhardt Montpellier
- CNRS/ENSCM/UM
- 34090 Montpellier
- France
| | - Tzonka Mineva
- Institut Charles Gerhardt Montpellier
- CNRS/ENSCM/UM
- 34090 Montpellier
- France
| | | | - Hazar Guesmi
- Institut Charles Gerhardt Montpellier
- CNRS/ENSCM/UM
- 34090 Montpellier
- France
| | - Jenia Georgieva
- Rostislaw Kaischew Institute of Physical Chemistry
- Bulgarian Academy of Sciences
- Sofia 1113
- Bulgaria
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12
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Krishnan R, Wu SY, Chen HT. Single Pt atom supported on penta-graphene as an efficient catalyst for CO oxidation. Phys Chem Chem Phys 2019; 21:12201-12208. [DOI: 10.1039/c9cp02306b] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We performed a systematic study of CO oxidation on a single Pt atom supported on penta-graphene (Pt/PG) by utilizing spin-polarized first-principles calculations. The results manifested that Pt/PG, as a single-atom catalyst, exhibited excellent catalytic activity toward CO oxidation and provided a novel strategy for the design of single-atom catalysts based on penta-graphene.
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Affiliation(s)
- Ranganathan Krishnan
- Department of Chemistry and R&D Center for Membrane Technology
- Chung Yuan Christian University
- Taoyuan City
- Taiwan
| | - Shiuan-Yau Wu
- Department of Chemistry and R&D Center for Membrane Technology
- Chung Yuan Christian University
- Taoyuan City
- Taiwan
| | - Hsin-Tsung Chen
- Department of Chemistry and R&D Center for Membrane Technology
- Chung Yuan Christian University
- Taoyuan City
- Taiwan
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13
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Pt(Cu) catalyst on TiO2 powder support prepared by photodeposition-galvanic replacement method. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.07.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Mahara Y, Ohyama J, Sawabe K, Satsuma A. Synthesis of Supported Bimetal Catalysts using Galvanic Deposition Method. CHEM REC 2018; 18:1306-1313. [PMID: 29469173 DOI: 10.1002/tcr.201700084] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 02/05/2018] [Indexed: 01/07/2023]
Abstract
Supported bimetallic catalysts have been studied because of their enhanced catalytic properties due to metal-metal interactions compared with monometallic catalysts. We focused on galvanic deposition (GD) as a bimetallization method, which achieves well-defined metal-metal interfaces by exchanging heterogeneous metals with different ionisation tendencies. We have developed Ni@Ag/SiO2 catalysts for CO oxidation, Co@Ru/Al2 O3 catalysts for automotive three-way reactions and Pd-Co/Al2 O3 catalysts for methane combustion by using the GD method. In all cases, the catalysts prepared by the GD method showed higher catalytic activity than the corresponding monometallic and bimetallic catalysts prepared by the conventional co-impregnation method. The GD method provides contact between noble and base metals to improve the electronic state, surface structure and reducibility of noble metals.
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Affiliation(s)
- Yuji Mahara
- Graduate School of Engineering, Nagoya University Furo-cho, Nagoya, 464-8603, Japan
| | - Junya Ohyama
- Graduate School of Engineering, Nagoya University Furo-cho, Nagoya, 464-8603, Japan.,Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University Katsura, Kyoto, 615-8520, Japan
| | - Kyoichi Sawabe
- Graduate School of Engineering, Nagoya University Furo-cho, Nagoya, 464-8603, Japan
| | - Atsushi Satsuma
- Graduate School of Engineering, Nagoya University Furo-cho, Nagoya, 464-8603, Japan.,Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University Katsura, Kyoto, 615-8520, Japan
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16
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Krishnan R, Wu SY, Chen HT. Catalytic CO oxidation on B-doped and BN co-doped penta-graphene: a computational study. Phys Chem Chem Phys 2018; 20:26414-26421. [DOI: 10.1039/c8cp04745f] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The catalytic reaction of carbon monoxide oxidation on boron-doped and boron–nitrogen co-doped penta-graphene materials has been systematically studied by utilizing spin-polarized density functional theory (DFT) calculations.
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Affiliation(s)
| | - Shiuan-Yau Wu
- Department of Chemistry
- Chung Yuan Christian University
- Taoyuan City
- Taiwan
| | - Hsin-Tsung Chen
- Department of Chemistry
- Chung Yuan Christian University
- Taoyuan City
- Taiwan
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17
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Pt-doped TiO 2 /WO 3 bi-layer catalysts on graphite substrates with enhanced photoelectrocatalytic activity for methanol oxidation under visible light. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.05.049] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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19
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Diodati S, Negro E, Vezzù K, Di Noto V, Gross S. Oxygen reduction reaction and X-ray photoelectron spectroscopy characterisation of carbon nitride-supported bimetallic electrocatalysts. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.08.060] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Georgieva J, Valova E, Mintsouli I, Sotiropoulos S, Tatchev D, Armyanov S, Hubin A, Dille J, Hoell A, Raghuwanshi V, Karanasios N, Malet L. Pt(Ni) electrocatalysts for methanol oxidation prepared by galvanic replacement on TiO 2 and TiO 2 –C powder supports. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.07.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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21
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Sutter E, Jungjohann K, Bliznakov S, Courty A, Maisonhaute E, Tenney S, Sutter P. In situ liquid-cell electron microscopy of silver–palladium galvanic replacement reactions on silver nanoparticles. Nat Commun 2014; 5:4946. [DOI: 10.1038/ncomms5946] [Citation(s) in RCA: 149] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2014] [Accepted: 08/10/2014] [Indexed: 12/22/2022] Open
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22
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Georgieva J, Sotiropoulos S, Valova E, Armyanov S, Karanasios N. Methanol oxidation and photo-oxidation at Pt/WO3 electrocatalysts on graphite substrates. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2014.06.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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23
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Papaderakis A, Pliatsikas N, Prochaska C, Papazisi KM, Balomenou SP, Tsiplakides D, Patsalas P, Sotiropoulos S. Ternary Pt-Ru-Ni catalytic layers for methanol electrooxidation prepared by electrodeposition and galvanic replacement. Front Chem 2014; 2:29. [PMID: 24959530 PMCID: PMC4050425 DOI: 10.3389/fchem.2014.00029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2013] [Accepted: 04/30/2014] [Indexed: 11/16/2022] Open
Abstract
Ternary Pt-Ru-Ni deposits on glassy carbon substrates, Pt-Ru(Ni)/GC, have been formed by initial electrodeposition of Ni layers onto glassy carbon electrodes, followed by their partial exchange for Pt and Ru, upon their immersion into equimolar solutions containing complex ions of the precious metals. The overall morphology and composition of the deposits has been studied by SEM microscopy and EDS spectroscopy. Continuous but nodular films have been confirmed, with a Pt ÷ Ru ÷ Ni % bulk atomic composition ratio of 37 ÷ 12 ÷ 51 (and for binary Pt-Ni control systems of 47 ÷ 53). Fine topographical details as well as film thickness have been directly recorded using AFM microscopy. The composition of the outer layers as well as the interactions of the three metals present have been studied by XPS spectroscopy and a Pt ÷ Ru ÷ Ni % surface atomic composition ratio of 61 ÷ 12 ÷ 27 (and for binary Pt-Ni control systems of 85 ÷ 15) has been found, indicating the enrichment of the outer layers in Pt; a shift of the Pt binding energy peaks to higher values was only observed in the presence of Ru and points to an electronic effect of Ru on Pt. The surface electrochemistry of the thus prepared Pt-Ru(Ni)/GC and Pt(Ni)/GC electrodes in deaerated acid solutions (studied by cyclic voltammetry) proves the existence of a shell consisting exclusively of Pt-Ru or Pt. The activity of the Pt-Ru(Ni) deposits toward methanol oxidation (studied by slow potential sweep voltammetry) is higher from that of the Pt(Ni) deposit and of pure Pt; this enhancement is attributed both to the well-known Ru synergistic effect due to the presence of its oxides but also (based on the XPS findings) to a modification effect of Pt electronic properties.
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Affiliation(s)
- Athanasios Papaderakis
- Physical Chemistry Laboratory, Department of Chemistry, Aristotle University of Thessaloniki Thessaloniki, Greece ; Centre for Research and Technology Hellas, Chemical Process and Energy Resources Institute Thessaloniki, Greece
| | - Nikolaos Pliatsikas
- Department of Physics, Aristotle University of Thessaloniki Thessaloniki, Greece
| | - Chara Prochaska
- Physical Chemistry Laboratory, Department of Chemistry, Aristotle University of Thessaloniki Thessaloniki, Greece
| | - Kalliopi M Papazisi
- Centre for Research and Technology Hellas, Chemical Process and Energy Resources Institute Thessaloniki, Greece
| | - Stella P Balomenou
- Centre for Research and Technology Hellas, Chemical Process and Energy Resources Institute Thessaloniki, Greece
| | - Dimitrios Tsiplakides
- Physical Chemistry Laboratory, Department of Chemistry, Aristotle University of Thessaloniki Thessaloniki, Greece ; Centre for Research and Technology Hellas, Chemical Process and Energy Resources Institute Thessaloniki, Greece
| | - Panagiotis Patsalas
- Department of Physics, Aristotle University of Thessaloniki Thessaloniki, Greece
| | - Sotiris Sotiropoulos
- Physical Chemistry Laboratory, Department of Chemistry, Aristotle University of Thessaloniki Thessaloniki, Greece
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Lv Q, Chang J, Xing W, Liu C. Dispersion-controlled PtCu clusters synthesized with citric acid using galvanic displacement with high electrocatalytic activity toward methanol oxidation. RSC Adv 2014. [DOI: 10.1039/c4ra04417g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Dispersion-controlled carbon supported PtCu clusters were firstly synthesized using galvanic displacement of Cu/C, in which citric acid worked as the dispersion agent and its concentration was adjusted to form the as-synthesized clusters. It was found that dispersion played a significant role in tuning the activity for methanol electrooxidation.
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Affiliation(s)
- Qing Lv
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun, China
- University of Chinese Academy of Sciences
| | - Jinfa Chang
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun, China
- University of Chinese Academy of Sciences
| | - Wei Xing
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun, China
| | - Changpeng Liu
- Laboratory of Advanced Power Sources
- Changchun Institute of Applied Chemistry
- Changchun, China
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Georgieva J, Valova E, Mintsouli I, Sotiropoulos S, Armyanov S, Kakaroglou A, Hubin A, Steenhaut O, Dille J. Carbon-supported Pt(Cu) electrocatalysts for methanol oxidation prepared by Cu electroless deposition and its galvanic replacement by Pt. J APPL ELECTROCHEM 2013. [DOI: 10.1007/s10800-013-0618-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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26
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Kang J, Wang R, Wang H, Liao S, Key J, Linkov V, Ji S. Effect of Ni Core Structure on the Electrocatalytic Activity of Pt-Ni/C in Methanol Oxidation. MATERIALS 2013; 6:2689-2700. [PMID: 28811402 PMCID: PMC5521225 DOI: 10.3390/ma6072689] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2013] [Revised: 04/07/2013] [Accepted: 04/16/2013] [Indexed: 11/28/2022]
Abstract
Methanol oxidation catalysts comprising an outer Pt-shell with an inner Ni-core supported on carbon, (Pt-Ni/C), were prepared with either crystalline or amorphous Ni core structures. Structural comparisons of the two forms of catalyst were made using transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), and methanol oxidation activity compared using CV and chronoamperometry (CA). While both the amorphous Ni core and crystalline Ni core structures were covered by similar Pt shell thickness and structure, the Pt-Ni(amorphous)/C catalyst had higher methanol oxidation activity. The amorphous Ni core thus offers improved Pt usage efficiency in direct methanol fuel cells.
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Affiliation(s)
- Jian Kang
- Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
| | - Rongfang Wang
- Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
| | - Hui Wang
- Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
| | - Shijun Liao
- Key Laboratory of Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangdong, Guangzhou 510640, China.
| | - Julian Key
- South African Institute for Advanced Materials Chemistry, University of the Western Cape, Cape Town 7535, South Africa.
| | - Vladimir Linkov
- South African Institute for Advanced Materials Chemistry, University of the Western Cape, Cape Town 7535, South Africa.
| | - Shan Ji
- South African Institute for Advanced Materials Chemistry, University of the Western Cape, Cape Town 7535, South Africa.
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