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Gashnikova D, Maurer F, Sauter E, Bernart S, Jelic J, Dolcet P, Maliakkal CB, Wang Y, Wöll C, Studt F, Kübel C, Casapu M, Grunwaldt JD. Highly Active Oxidation Catalysts through Confining Pd Clusters on CeO 2 Nano-Islands. Angew Chem Int Ed Engl 2024:e202408511. [PMID: 38877822 DOI: 10.1002/anie.202408511] [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: 05/05/2024] [Revised: 06/06/2024] [Accepted: 06/07/2024] [Indexed: 06/16/2024]
Abstract
CeO2-supported noble metal clusters are attractive catalytic materials for several applications. However, their atomic dispersion under oxidizing reaction conditions often leads to catalyst deactivation. In this study, the noble metal cluster formation threshold is rationally adjusted by using a mixed CeO2-Al2O3 support. The preferential location of Pd on CeO2 islands leads to a high local surface noble metal concentration and promotes the in situ formation of small Pd clusters at a rather low noble metal loading (0.5 wt %), which are shown to be the active species for CO conversion at low temperatures. As elucidated by complementary in situ/operando techniques, the spatial separation of CeO2 islands on Al2O3 confines the mobility of Pd, preventing the full redispersion or the formation of larger noble metal particles and maintaining a high CO oxidation activity at low temperatures. In a broader perspective, this approach to more efficiently use the noble metal can be transferred to further systems and reactions in heterogeneous catalysis.
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Affiliation(s)
- Daria Gashnikova
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131, Karlsruhe, Germany
| | - Florian Maurer
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131, Karlsruhe, Germany
| | - Eric Sauter
- Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Sarah Bernart
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Jelena Jelic
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Paolo Dolcet
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131, Karlsruhe, Germany
- Current address: Department of Chemical Sciences, University of Padova, via Francesco Marzolo 1, 35131, Padova, Italy
| | - Carina B Maliakkal
- Institute of Nanotechnology (INT) and, Karlsruhe Nano Micro Facility (KNMFi), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Yuemin Wang
- Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Christof Wöll
- Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Felix Studt
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Christian Kübel
- Institute of Nanotechnology (INT) and, Karlsruhe Nano Micro Facility (KNMFi), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
- Institute of Materials Research, Technical University Darmstadt (TUDa), Peter-Grünberg-Straße 2, 64287, Darmstadt, Germany
| | - Maria Casapu
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131, Karlsruhe, Germany
| | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131, Karlsruhe, Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
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Korchagin O, Bogdanovskaya V, Vernigor I, Radina M, Stenina I, Yaroslavtsev A. Development of Hydrogen-Oxygen Fuel Cells Based on Anion-Exchange Electrolytes and Catalysts with Reduced Platinum Content. MEMBRANES 2023; 13:669. [PMID: 37505035 PMCID: PMC10383164 DOI: 10.3390/membranes13070669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 07/03/2023] [Accepted: 07/12/2023] [Indexed: 07/29/2023]
Abstract
Studies have been carried out to optimize the composition, formation technique and test conditions of membrane electrode assemblies (MEA) of hydrogen-oxygen anion-exchange membranes fuel cells (AEMFC), based on Fumatech anion-exchange membranes. A non-platinum catalytic system based on nitrogen-doped CNT (CNTN) was used in the cathode. PtMo/CNTN catalysts with a reduced content of platinum (10-12 wt.% Pt) were compared with 10 and 60 wt.% Pt/CNTN at the anode. According to the results of studies under model conditions, it was found that the PtMo/CNTN catalyst is significantly superior to the 10 and 60 wt.% Pt/CNTN catalyst in terms of activity in the hydrogen oxidation reaction based on the mass of platinum. The addition of the Fumion ionomer results in minor changes in the electrochemically active surface area and activity in the hydrogen oxidation reaction for each of the catalysts. In this case, the introduction of ionomer-Fumion leads to a partial blocking of the outer surface and the micropore surface, which is most pronounced in the case of the 60Pt/CNTN catalyst. This effect can cause a decrease in the characteristics of MEA AEMFC upon passing from 10PtMo/CNTN to 60Pt/CNTN in the anode active layer. The maximum power density of the optimized MEA based on 10PtMo/CNTN was 62 mW cm-2, which exceeds the literature data obtained under similar test conditions for MEA based on platinum cathode and anode catalysts and Fumatech membranes (41 mW cm-2). A new result of this work is the study of the effect of the ionomer (Fumion) on the characteristics of catalysts. It is shown that the synthesized 10PtMo/CNTN catalyst retains high activity in the presence of an ionomer under model conditions and in the MEA based on it.
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Affiliation(s)
- Oleg Korchagin
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia
| | - Vera Bogdanovskaya
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia
| | - Inna Vernigor
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia
| | - Marina Radina
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia
| | - Irina Stenina
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119071 Moscow, Russia
| | - Andrey Yaroslavtsev
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119071 Moscow, Russia
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Moreno H, Domingues GL, Assis M, Ortega PP, Mastelaro VR, Ramirez MA, Simões AZ. The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO 2 Nanocrystals. Inorg Chem 2023; 62:4291-4303. [PMID: 36862825 DOI: 10.1021/acs.inorgchem.2c04411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
In this work, we focus on understanding the morphology and photocatalytic properties of CeO2 nanocrystals (NCs) synthesized via a microwave-assisted solvothermal method using acetone and ethanol as solvents. Wulff constructions reveal a complete map of available morphologies and a theoretical-experimental match with octahedral nanoparticles obtained through synthesis using ethanol as solvent. NCs synthesized in acetone show a greater contribution of emission peaks in the blue region (∼450 nm), which may be associated with higher Ce3+ concentration, originating shallow-level defects within the CeO2 lattice while for the samples synthesized in ethanol a strong orange-red emission (∼595 nm) suggests that oxygen vacancies may originate from deep-level defects within the optical bandgap region. The superior photocatalytic response of CeO2 synthesized in acetone compared to that of CeO2 synthesized in ethanol may be associated with an increase in long-/short-range disorder within the CeO2 structure, causing the Egap value to decrease, facilitating light absorption. Furthermore, surface (100) stabilization in samples synthesized in ethanol may be related to low photocatalytic activity. Photocatalytic degradation was facilitated by the generation of ·OH and ·O2- radicals as corroborated by the trapping experiment. The mechanism of enhanced photocatalytic activity has been proposed suggesting that samples synthesized in acetone tend to have lower e'─h· pair recombination, which is reflected in their higher photocatalytic response.
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Affiliation(s)
- H Moreno
- School of Engineering and Science, São Paulo State University, Av. Dr. Ariberto Pereira da Cunha 333, Portal das Colinas, Guaratingueta 12516-410, São Paulo, Brazil
| | - G L Domingues
- School of Engineering and Science, São Paulo State University, Av. Dr. Ariberto Pereira da Cunha 333, Portal das Colinas, Guaratingueta 12516-410, São Paulo, Brazil
| | - M Assis
- Department of Analytical and Physical Chemistry, University Jaume I, Av. Vicent Sos Baynat s/n, Castellón 12071, Spain
| | - P P Ortega
- School of Engineering and Science, São Paulo State University, Av. Dr. Ariberto Pereira da Cunha 333, Portal das Colinas, Guaratingueta 12516-410, São Paulo, Brazil
| | - V R Mastelaro
- São Carlos Institute of Physics, University of São Paulo, São Carlos 13566-590, Brazil
| | - M A Ramirez
- School of Engineering and Science, São Paulo State University, Av. Dr. Ariberto Pereira da Cunha 333, Portal das Colinas, Guaratingueta 12516-410, São Paulo, Brazil
| | - A Z Simões
- School of Engineering and Science, São Paulo State University, Av. Dr. Ariberto Pereira da Cunha 333, Portal das Colinas, Guaratingueta 12516-410, São Paulo, Brazil
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Willdorf-Cohen S, Zhegur-Khais A, Ponce-González J, Bsoul-Haj S, Varcoe JR, Diesendruck CE, Dekel DR. Alkaline Stability of Anion-Exchange Membranes. ACS APPLIED ENERGY MATERIALS 2023; 6:1085-1092. [PMID: 36937111 PMCID: PMC10016746 DOI: 10.1021/acsaem.2c03689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Accepted: 12/23/2022] [Indexed: 06/18/2023]
Abstract
Recently, the development of durable anion-exchange membrane fuel cells (AEMFCs) has increased in intensity due to their potential to use low-cost, sustainable components. However, the decomposition of the quaternary ammonium (QA) cationic groups in the anion-exchange membranes (AEMs) during cell operation is still a major challenge. Many different QA types and functionalized polymers have been proposed that achieve high AEM stabilities in strongly alkaline aqueous solutions. We previously developed an ex situ technique to measure AEM alkaline stabilities in an environment that simulates the low-hydration conditions in an operating AEMFC. However, this method required the AEMs to be soluble in DMSO solvent, so decomposition could be monitored using 1H nuclear magnetic resonance (NMR). We now report the extension of this ex situ protocol to spectroscopically measure the alkaline stability of insoluble AEMs. The stability ofradiation-grafted (RG) poly(ethylene-co-tetrafluoroethylene)-(ETFE)-based poly(vinylbenzyltrimethylammonium) (ETFE-TMA) and poly(vinylbenzyltriethylammonium) (ETFE-TEA) AEMs were studied using Raman spectroscopy alongside changes in their true OH- conductivities and ion-exchange capacities (IEC). A crosslinked polymer made from poly(styrene-co-vinylbenzyl chloride) random copolymer and N,N,N',N'-tetraethyl-1,3-propanediamine (TEPDA) was also studied. The results are consistent with our previous studies based on QA-type model small molecules and soluble poly(2,6-dimethylphenylene oxide) (PPO) polymers. Our work presents a reliable ex situ technique to measure the true alkaline stability of AEMs for fuel cells and water electrolyzers.
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Affiliation(s)
- Sapir Willdorf-Cohen
- The
Wolfson Department of Chemical Engineering, Technion—Israel Institute of Technology, Haifa3200003, Israel
| | - Avital Zhegur-Khais
- The
Wolfson Department of Chemical Engineering, Technion—Israel Institute of Technology, Haifa3200003, Israel
| | - Julia Ponce-González
- School
of Chemistry and Chemical Engineering, University
of Surrey, GuildfordGU2 7XH, U.K.
| | - Saja Bsoul-Haj
- The
Wolfson Department of Chemical Engineering, Technion—Israel Institute of Technology, Haifa3200003, Israel
| | - John R. Varcoe
- School
of Chemistry and Chemical Engineering, University
of Surrey, GuildfordGU2 7XH, U.K.
| | - Charles E. Diesendruck
- Schulich
Faculty of Chemistry, Technion—Israel
Institute of Technology, Haifa3200003, Israel
- The
Nancy & Stephen Grand Technion Energy Program (GTEP), Technion—Israel Institute of Technology, Haifa3200003, Israel
| | - Dario R. Dekel
- The
Wolfson Department of Chemical Engineering, Technion—Israel Institute of Technology, Haifa3200003, Israel
- The
Nancy & Stephen Grand Technion Energy Program (GTEP), Technion—Israel Institute of Technology, Haifa3200003, Israel
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5
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Probing the effect of metal-CeO2 interactions in carbon supported electrocatalysts on alkaline hydrogen oxidation and evolution reactions. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Sena Kazan-Kaya E, Bayramoğlu M. Investigation of ethanol fuel electrooxidation reaction on Ni-CeO2NRs anode electrocatalyst in alkaline media. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Pagliaro MV, Wen C, Sa B, Liu B, Bellini M, Bartoli F, Sahoo S, Singh RK, Alpay SP, Miller HA, Dekel DR. Improving Alkaline Hydrogen Oxidation Activity of Palladium through Interactions with Transition-Metal Oxides. ACS Catal 2022. [DOI: 10.1021/acscatal.2c02417] [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)
- Maria V. Pagliaro
- Institute of Chemistry of OrganoMetallic Compounds, CNR-ICCOM, Via Madonna del Piano, 10, 50019 Sesto Fiorentino, Florence, Italy
| | - Cuilian Wen
- Multiscale Computational Materials Facility, and Key Laboratory of Eco-materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Fuzhou 350100, P. R. China
| | - Baisheng Sa
- Multiscale Computational Materials Facility, and Key Laboratory of Eco-materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Fuzhou 350100, P. R. China
| | - Baoyu Liu
- Multiscale Computational Materials Facility, and Key Laboratory of Eco-materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Fuzhou 350100, P. R. China
| | - Marco Bellini
- Institute of Chemistry of OrganoMetallic Compounds, CNR-ICCOM, Via Madonna del Piano, 10, 50019 Sesto Fiorentino, Florence, Italy
| | - Francesco Bartoli
- Institute of Chemistry of OrganoMetallic Compounds, CNR-ICCOM, Via Madonna del Piano, 10, 50019 Sesto Fiorentino, Florence, Italy
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Via Aldo Moro 2, Siena 53100, Italy
| | - Sanjubala Sahoo
- Department of Materials Science and Engineering and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Ramesh K. Singh
- The Wolfson Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel
- The Nancy & Stephen Grand Technion Energy Program, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | - S. Pamir Alpay
- Department of Materials Science and Engineering and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Hamish A. Miller
- Institute of Chemistry of OrganoMetallic Compounds, CNR-ICCOM, Via Madonna del Piano, 10, 50019 Sesto Fiorentino, Florence, Italy
| | - Dario R. Dekel
- The Wolfson Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel
- The Nancy & Stephen Grand Technion Energy Program, Technion - Israel Institute of Technology, Haifa 3200003, Israel
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8
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Ogada JJ, Ipadeola AK, Mwonga PV, Haruna AB, Nichols F, Chen S, Miller HA, Pagliaro MV, Vizza F, Varcoe JR, Meira DM, Wamwangi DM, Ozoemena KI. CeO 2 Modulates the Electronic States of a Palladium Onion-Like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion-Exchange-Membrane Fuel Cells. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01863] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jimodo J. Ogada
- School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Adewale K. Ipadeola
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Patrick V. Mwonga
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Aderemi B. Haruna
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Forrest Nichols
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, United States
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, United States
| | - Hamish A. Miller
- Institute of Chemistry of Organometallic Compounds − National Research Council of Italy (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
| | - Maria V. Pagliaro
- Institute of Chemistry of Organometallic Compounds − National Research Council of Italy (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
| | - Francesco Vizza
- Institute of Chemistry of Organometallic Compounds − National Research Council of Italy (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
| | - John R. Varcoe
- Department of Chemistry, University of Surrey, Guildford, Surrey GU2 7XH, U.K
| | - Debora Motta Meira
- CLS@APS Sector 20, Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, United States
- Canadian Light Source Inc., 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Daniel M. Wamwangi
- School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Kenneth I. Ozoemena
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
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