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Wibowo RE, Garcia-Diez R, Bystron T, van der Merwe M, Prokop M, Arce MD, Efimenko A, Steigert A, Bernauer M, Wilks RG, Bouzek K, Bär M. Elucidating the Complex Oxidation Behavior of Aqueous H 3PO 3 on Pt Electrodes via In Situ Tender X-ray Absorption Near-Edge Structure Spectroscopy at the P K-Edge. J Am Chem Soc 2024; 146:7386-7399. [PMID: 38459944 PMCID: PMC10958492 DOI: 10.1021/jacs.3c12381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 02/22/2024] [Accepted: 02/23/2024] [Indexed: 03/11/2024]
Abstract
In situ tender X-ray absorption near-edge structure (XANES) spectroscopy at the P K-edge was utilized to investigate the oxidation mechanism of aqueous H3PO3 on Pt electrodes under various conditions relevant to high-temperature polymer electrolyte membrane fuel cell (HT-PEMFC) applications. XANES and electrochemical analysis were conducted under different tender X-ray irradiation doses, revealing that intense radiation induces the oxidation of aqueous H3PO3 via H2O yielding H3PO4 and H2. A broadly applicable experimental procedure was successfully developed to suppress these undesirable radiation-induced effects, enabling a more accurate determination of the aqueous H3PO3 oxidation mechanism. In situ XANES studies of aqueous 5 mol dm-3 H3PO3 on electrodes with varying Pt availability and surface roughness reveal that Pt catalyzes the oxidation of aqueous H3PO3 to H3PO4. This oxidation is enhanced upon applying a positive potential to the Pt electrode or raising the electrolyte temperature, the latter being corroborated by complementary ion-exchange chromatography measurements. Notably, all of these oxidation processes involve reactions with H2O, as further supported by XANES measurements of aqueous H3PO3 of different concentrations, showing a more pronounced oxidation in electrolytes with a higher H2O content. The significant role of water in the oxidation of H3PO3 to H3PO4 supports the reaction mechanisms proposed for various chemical processes observed in this work and provides valuable insights into potential strategies to mitigate Pt catalyst poisoning by H3PO3 during HT-PEMFC operation.
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Affiliation(s)
- Romualdus Enggar Wibowo
- Department
of Interface Design, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH (HZB), Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Raul Garcia-Diez
- Department
of Interface Design, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH (HZB), Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Tomas Bystron
- Department
of Inorganic Technology, University of Chemistry
and Technology Prague, Technicka 5, Prague 6 166 28, Czech Republic
| | - Marianne van der Merwe
- Department
of Interface Design, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH (HZB), Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Martin Prokop
- Department
of Inorganic Technology, University of Chemistry
and Technology Prague, Technicka 5, Prague 6 166 28, Czech Republic
| | - Mauricio D. Arce
- Department
of Interface Design, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH (HZB), Albert-Einstein-Straße 15, 12489 Berlin, Germany
- Departamento
Caracterización de Materiales, INN-CNEA-CONICET, Centro Atómico Bariloche, Avenida Bustillo 9500, S. C. de Bariloche, Rio Negro 8400, Argentina
| | - Anna Efimenko
- Department
of Interface Design, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH (HZB), Albert-Einstein-Straße 15, 12489 Berlin, Germany
- Energy
Materials In-situ Laboratory Berlin (EMIL), Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
(HZB), Albert-Einstein
Straße 15, 12489 Berlin, Germany
| | - Alexander Steigert
- Institute
of Nanospectroscopy, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH (HZB), Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Milan Bernauer
- Department
of Inorganic Technology, University of Chemistry
and Technology Prague, Technicka 5, Prague 6 166 28, Czech Republic
| | - Regan G. Wilks
- Department
of Interface Design, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH (HZB), Albert-Einstein-Straße 15, 12489 Berlin, Germany
- Energy
Materials In-situ Laboratory Berlin (EMIL), Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
(HZB), Albert-Einstein
Straße 15, 12489 Berlin, Germany
| | - Karel Bouzek
- Department
of Inorganic Technology, University of Chemistry
and Technology Prague, Technicka 5, Prague 6 166 28, Czech Republic
| | - Marcus Bär
- Department
of Interface Design, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH (HZB), Albert-Einstein-Straße 15, 12489 Berlin, Germany
- Energy
Materials In-situ Laboratory Berlin (EMIL), Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
(HZB), Albert-Einstein
Straße 15, 12489 Berlin, Germany
- Department
of Chemistry and Pharmacy, Friedrich-Alexander-Universität
Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
- Department
of X-ray Spectroscopy at Interfaces of Thin Films, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy
(HI ERN), Albert-Einstein-Straße
15, 12489 Berlin, Germany
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Gomes BF, Prokop M, Bystron T, Loukrakpam R, Melke J, Lobo CMS, Fink M, Zhu M, Voloshina E, Kutter M, Hoffmann H, Yusenko KV, Buzanich AG, Röder B, Bouzek K, Paulus B, Roth C. Following Adsorbed Intermediates on a Platinum Gas Diffusion Electrode in H 3PO 3-Containing Electrolytes Using In Situ X-ray Absorption Spectroscopy. ACS Catal 2022. [DOI: 10.1021/acscatal.2c02630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bruna F. Gomes
- Chair of Electrochemical Process Engineering, University of Bayreuth, Universitätsstraße 30, Bayreuth 95447, Germany
| | - Martin Prokop
- Department of Inorganic Technology, University of Chemistry and Technology Prague, Technicka 5, Prague 6 166 28, Czech Republic
| | - Tomas Bystron
- Department of Inorganic Technology, University of Chemistry and Technology Prague, Technicka 5, Prague 6 166 28, Czech Republic
| | - Rameshwori Loukrakpam
- Chair of Electrochemical Process Engineering, University of Bayreuth, Universitätsstraße 30, Bayreuth 95447, Germany
| | - Julia Melke
- Department for Applied Electrochemistry, Fraunhofer Institute for Chemical Technology (ICT), Joseph-von-Fraunhofer-Str. 7, Pfinztal 76327, Germany
- Institute of Inorganic and Analytical Chemistry, University of Freiburg, Albertstr. 21, Freiburg 79104, Germany
| | - Carlos M. S. Lobo
- Institute for Technical Chemistry, University of Stuttgart, Pfaffenwaldring 55, Stuttgart 70569, Germany
| | - Michael Fink
- Chair of Electrochemical Process Engineering, University of Bayreuth, Universitätsstraße 30, Bayreuth 95447, Germany
| | - Mengshu Zhu
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 22, Berlin 14195, Germany
| | - Elena Voloshina
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 22, Berlin 14195, Germany
| | - Maximilian Kutter
- Chair of Electrochemical Process Engineering, University of Bayreuth, Universitätsstraße 30, Bayreuth 95447, Germany
| | - Hendrik Hoffmann
- Chair of Electrochemical Process Engineering, University of Bayreuth, Universitätsstraße 30, Bayreuth 95447, Germany
| | - Kirill V. Yusenko
- Federal Institute for Materials Research and Testing BAM, Richard-Willstätter Str. 11, Berlin D-12489, Germany
| | - Ana Guilherme Buzanich
- Federal Institute for Materials Research and Testing BAM, Richard-Willstätter Str. 11, Berlin D-12489, Germany
| | - Bettina Röder
- Federal Institute for Materials Research and Testing BAM, Richard-Willstätter Str. 11, Berlin D-12489, Germany
| | - Karel Bouzek
- Department of Inorganic Technology, University of Chemistry and Technology Prague, Technicka 5, Prague 6 166 28, Czech Republic
| | - Beate Paulus
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 22, Berlin 14195, Germany
| | - Christina Roth
- Chair of Electrochemical Process Engineering, University of Bayreuth, Universitätsstraße 30, Bayreuth 95447, Germany
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Prokop M, Bystron T, Belsky P, Tucek O, Kodym R, Paidar M, Bouzek K. Degradation kinetics of Pt during high-temperature PEM fuel cell operation Part III: Voltage-dependent Pt degradation rate in single-cell experiments. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.137165] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Prokop M, Kodym R, Bystron T, Drakselova M, Paidar M, Bouzek K. Degradation kinetics of Pt during high-temperature PEM fuel cell operation part II: Dissolution kinetics of Pt incorporated in a catalyst layer of a gas-diffusion electrode. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2019.135509] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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