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Synergistic Bimetallic PdNi Nanoparticles: Enhancing Glycerol Electrooxidation While Preserving C3 Product Selectivity
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0002-4759-5895
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-8871-3368
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2024 (English)In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 7, no 5, p. 1802-1813Article in journal (Refereed) Published
Abstract [en]

Electrochemical conversion of glycerol offers a promising route to synthesize value-added glycerol oxidation products (GOPs) from an abundant biomass-based resource. While noble metals provide a low overpotential for the glycerol electrooxidation reaction (GEOR) and high selectivity toward three-carbon (C3) GOPs, their efficiency and cost can be improved by incorporating non-noble metals. Here, we introduce an effective strategy to enhance the performance of Pd nanoparticles for the GEOR by alloying them with Ni. The resulting PdNi nanoparticles show a significant increase in both specific activity (by almost 60%) and mass activity (by almost 35%) during the GEOR at 40 °C. Additionally, they exhibit higher resistance to deactivation compared to pure Pd. Analysis of the GOPs reveals that the addition of Ni into Pd does not compromise the selectivity, with glycerate remaining at around 60% of the product fraction and the other major product being lactate at around 30%. Density functional theory calculations confirm the reaction pathways and the basis for the higher activity of PdNi. This study demonstrates a significant increase in the GEOR catalytic performance while maintaining the selectivity for C3 GOPs, using a more cost-effective nanocatalyst.

Place, publisher, year, edition, pages
2024. Vol. 7, no 5, p. 1802-1813
Keywords [en]
alkaline, electrocatalysis, density functional theory, HPLC, value-added products
National Category
Chemical Engineering
Research subject
Materials Science
Identifiers
URN: urn:nbn:se:su:diva-227996DOI: 10.1021/acsaem.3c02789ISI: 001179265900001Scopus ID: 2-s2.0-85186369938OAI: oai:DiVA.org:su-227996DiVA, id: diva2:1849385
Funder
Swedish Foundation for Strategic Research, EM16-0010Swedish Research Council, 2022-06725Swedish Research Council, 2018-05973Academy of Finland, 355569Available from: 2024-04-06 Created: 2024-04-06 Last updated: 2025-02-18Bibliographically approved
In thesis
1. On selective glycerol valorisation: Exploring the performance of facet-controlled nanoelectrocatalysts
Open this publication in new window or tab >>On selective glycerol valorisation: Exploring the performance of facet-controlled nanoelectrocatalysts
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

     As the biodiesel industry's growth skyrocketed in the past 20 years, it resulted in the accumulation of its main by-product—glycerol. Despite its extensive applications in the pharmaceutical industry, medicine, cosmetics, agriculture, and food industries, the supply exceeds the demand. Hence, glycerol, being abundant and cheap, has emerged as a promising feedstock for producing value-added chemicals. One of the tactics to generate those products is the glycerol electrooxidation reaction (GEOR), where glycerol is oxidised at the anode and hydrogen gas is generated at the cathode.

In the present thesis, noble metal-based nanoparticles were synthesised, characterised, and evaluated in alkaline media as catalysts for the GEOR. In order to assess and optimise the electrocatalytic performance and selectivity of the GEOR toward three-carbon (C3) products, different parameters like the morphology and composition of the catalyst, exposed crystallographic facets, electrolyte composition and electrolysis potential were studied.

The centre of the attention of the research covered were Pd, Pd-Ni, Pt and Pt-Co nanoparticles with an octahedral, rhombic dodecahedral, and cubic shape and more irregular shapes. Cubic-shaped catalysts with {100} faces were the best-performing among the investigated systems. In addition, alloying of Pd and Pt with non-noble Ni and Co improved the efficiency of the GEOR compared to their noble monometallic counterparts while generally retaining the selectivity of C3 products mostly represented by glycerate and lactate.

Abstract [sv]

Under de senaste 20 åren har tillväxten inom biodieselindustrin skjutit i höjden och resulterat i en ackumulering av dess huvudsakliga biprodukt – glycerol. Trots dess omfattande användning inom läkemedels-, kosmetika-, och livsmedelsindustrin och medicin samt inom jordbruket överstiger utbudet efterfrågan. Därför har glycerol, som är ett rikligt förekommande och billigt ämne, framträtt som en lovande råvara för produktion av värdefulla kemikalier. En av strategierna för att generera dessa produkter är glycerolelektrooxidationsreaktionen (GEOR), där glycerol oxideras vid anoden och vätgas genereras vid katoden.

I den här avhandlingen syntetiserades, karakteriserades och utvärderades nanopartiklar baserade på ädla metaller i alkaliska medier som katalysatorer för GEOR. För att bedöma och optimera den elektrokatalytiska prestandan och selektiviteten hos GEOR gentemot produkter med tre kolatomer (C3), studerades olika parametrar såsom katalysatorernas morfologi, sammansättning, exponerade kristallografiska fasetter, elektrolytsammansättning och elektrolyspotential.

Forskningsfokus låg på Pd, Pd-Ni, Pt och Pt-Co nanopartiklar med oktaedrisk, rombisk dodekaedrisk och kubisk form, samt mer irreguljärt formade dendriter och nanopartiklar. Kubformade katalysatorer med {100} ytor var de bäst presterande. Dessutom förbättrade legering av Pd och Pt med icke-ädelmetallerna Ni och Co effektiviteten hos GEOR jämfört med deras ädla monometalliska motsvarigheter, samtidigt som de i allmänhet behöll selektiviteten för C3-produkter som främst representeras av glycerat och laktat.

Abstract [ru]

Стремительный рост производства биодизеля в течение последних 20 лет привёл к избытку его основного побочного продукта, глицерина, вопреки его широкому применению в фармацевтике, медицине, сельском хозяйстве, косметической и пищевой промышленности. Одним из способов его реализации является валоризация путём реакции электроокисления глицерина (РЭОГ), в ходе которой глицерин окисляется на аноде, а газообразный водород выделяется на катоде.

В ходе выполнения настоящей диссертации были синтезированы и охарактеризованы наночастицы на основе благородных металлов и исследованы их электрокаталитические свойства в РЭОГ в щелочной среде. Для оценки и оптимизации электрокаталитической активности и селективности РЭОГ к трёхуглеродным (C3) продуктам были изучены такие параметры как морфология и состав катализаторов, тип кристаллографических граней, состав электролита и потенциал электролиза.

Объектами исследования были Pd, Pd-Ni, Pt и Pt-Co наночастицы октаэдрической, ромбододекаэдрической и кубической формы, а также дендриты и наночастицы более неправильной формы. Катализаторы кубической формы с {100} гранями имели лучшие характеристики среди изученных систем. Кроме того, легирование Pd и Pt с неблагородными Ni и Co улучшило эффективность РЭОГ по сравнению с их монометаллическими аналогами с сохранением селективности к C3 продуктам, среди которых преобладали глицерат и лактат.

Place, publisher, year, edition, pages
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2024. p. 86
Keywords
glycerol electrooxidation, nanocatalyst, facet control, alloy, HPLC, электроокисление глицерина, нанокатализатор, контроль граней, легирование, ВЭЖХ, glycerolelektrooxidation, nanokatalysator, fasettkontroll, legering, HPLC
National Category
Chemical Sciences Materials Chemistry Nano Technology
Research subject
Inorganic Chemistry
Identifiers
urn:nbn:se:su:diva-227999 (URN)978-91-8014-757-6 (ISBN)978-91-8014-758-3 (ISBN)
Public defence
2024-05-24, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B and online via Zoom, public link is available at the department website, Stockholm, 09:30 (English)
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Supervisors
Available from: 2024-04-29 Created: 2024-04-07 Last updated: 2024-04-25Bibliographically approved

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Terekhina, IrinaCampos dos Santos, EgonPettersson, Lars Gunnar MoodyJohnsson, Mats

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