Bimetallic PtCu core-shell nanoparticles in PtCu/C electrocatalysts: Structural and electrochemical characterization

Pryadchenko, V. V.; Srabionyan, Vasiliy V.; Kurzin, A. A.; Булат, Н. В.; Shemet, D. B.; Avakyan, L. A.; Беленов, С. В.; Волочаев, В. А.; Zizak, Ivo; Гутерман, В. Е.; Бугаев, Л. А.

doi:10.1016/j.apcata.2016.08.008

Cited by 48 publications

(31 citation statements)

References 44 publications

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“…A significant difference in the composition of the initial S1-S3 samples had practically no effect on the position of the characteristic reflections of the X-ray diffraction pattern, in particular, on 2 theta angles of the characteristic maximum 111 (Table 1, Figure 1b). Apparently, a larger or a smaller fraction of copper in these samples is contained in X-ray amorphous oxides [45], while the composition of the metal component of various catalysts is indeed similar. At the same time, the 2-theta angle of the maximum 111 in the diffraction patterns decreases with the transition from the starting materials (S1, S2, S3) to the de-alloyed catalysts obtained from them (Table 1, Figure 1).…”

Section: Methanol Electro-oxidation At the Alloyed And De-alloyed Plamentioning

confidence: 85%

“…Given the accuracy of the measurements, this indicates the absence of a significant effect of the initial composition and acid treatment on their size. At the same time, it should be noted that the application of the Scherrer equation to calculate the average size of bimetallic nanoparticles may provide results which are not quite accurate, since such calculation does not take into account the contribution of the inhomogeneous structure of nanoparticles to the broadening of reflection 111 [45].…”

Section: Methanol Electro-oxidation At the Alloyed And De-alloyed Plamentioning

confidence: 99%

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Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

et al. 2020

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The behavior of supported alloyed and de-alloyed platinum-copper catalysts, which contained 14–27% wt. of Pt, was studied in the reactions of methanol electrooxidation (MOR) and oxygen electroreduction (ORR) in 0.1 M HClO4 solutions. Alloyed PtCux/C catalysts were prepared by a multistage sequential deposition of copper and platinum onto a Vulcan XC72 dispersed carbon support. De-alloyed PtCux−y/C catalysts were prepared by PtCux/C materials pretreatment in acid solutions. The effects of the catalysts initial composition and the acid treatment condition on their composition, structure, and catalytic activity in MOR and ORR were studied. Functional characteristics of platinum-copper catalysts were compared with those of commercial Pt/C catalysts when tested, both in an electrochemical cell and in H2/Air membrane-electrode assembly (MEA). It was shown that the acid pretreatment of platinum-copper catalysts practically does not have negative effect on their catalytic activity, but it reduces the amount of copper passing into the solution during the subsequent electrochemical study. The activity of platinum-copper catalysts in the MOR and the current-voltage characteristics of the H2/Air proton-exchange membrane fuel cell MEAs measured in the process of their life tests were much higher than those of the Pt/C catalysts.

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Section: Methanol Electro-oxidation At the Alloyed And De-alloyed Plamentioning

confidence: 85%

Section: Methanol Electro-oxidation At the Alloyed And De-alloyed Plamentioning

confidence: 99%

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

et al. 2020

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“…1 и 2. Значения струк-турных параметров для приготовленных катализаторов согласуются со значениями, определенными ранее для аналогичных материалов [3,4]. Сразу следует обратить внимание на относительно малые значения парциальных координационных чисел N Cu−Cu и N Cu−Pt , сопоставимые по величине со значением N Cu−O .…”

Section: результатыunclassified

“…Наблюдаемое увеличение суммарного координационно-го числа медь−металл вместе с уменьшением коорди-национного числа медь−кислород может быть связано с частичным восстановлением ионов меди в процессе термической обработки [24]. Сделанный вывод подтвер-ждается результатами анализа химического состава на-ночастиц, выполненного для аналогичных материалов до и после их обработки в кислоте [3], в результате которой около половины атомов меди вымывается из образца. Отметим, что анализ химического состава исследуемых материалов, выполненный до и после длительного элек-трохимического тестирования, также подтверждает факт вымывания приблизительно 50% меди из образцов.…”

Section: результатыunclassified

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Влияние термообработки на атомную структуру core-shell наночастиц PtCu в составе электрокатализаторов PtCu/C

Прядченко¹,

Беленов²,

Shemet³

et al. 2017

Физика Твердого Тела

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Электрокатализаторы PtCu/C, содержащие биметаллические наночастицы PtCu, синтезированы методом последовательного химического восстановления Cu 2+ и Pt(IV) в углеродной суспензии, приготовленной на основе водного раствора этиленгликоля. Исследование атомной структуры приготовленных наночастиц PtCu, а также полученных после термической обработки при 350 • C было выполнено с помощью PtL 3 -и CuK-спектров рентгеновского поглощения в протяженной области (EXAFS), методов просвечивающей электронной микроскопии (ТЕМ) и порошковой рентгеновской дифракции (XRD). Согласованный анализ TEM-микрофотографий, XRD-профилей, а также EXAFS-спектров позволил установить, что в состав полученных электрокатализаторов входят наночастицы PtCu со структурой Cu-ядро−Pt-оболочка, а также оксиды меди Cu 2 O и CuO. Термическая обработка электрокатализаторов при 350 • C приводит к сплавлению биметаллических наночастиц с формированием как однородных, так и упорядоченных твердых растворов PtCu, а также к частичному восстановлению медных оксидов.Исследования структурных характеристик наночастиц PtCu проведены при финансовой поддержке Южного федерального университета (грант № ВнГр-07.2017-06). Методика синтеза катализатора PtCu/C разработана в рамках выполнения гранта РФФИ № 14-29-04041 офи_м.

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Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO₂RR)

et al. 2018

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In the face of the global energy challenge and progressing global climate change, renewable energy systems and components, such as fuel cells and electrolyzers, which close the energetic oxygen and carbon cycles, have become a technology development priority. The electrochemical oxygen reduction reaction (ORR) and the direct electrochemical carbon dioxide reduction reaction (CO2RR) are important electrocatalytic processes that proceed at gas diffusion electrodes of hydrogen fuel cells and CO2 electrolyzers, respectively. However, their low catalytic activity (voltage efficiency), limited long‐term stability, and moderate product selectivity (related to their Faradaic efficiency) have remained challenges. To address these, suitable catalysts are required. This review addresses the current state of research on Pt‐based and Cu‐based nanoalloy electrocatalysts for ORR and CO2RR, respectively, and critically compares and contrasts key performance parameters such as activity, selectivity, and durability. In particular, Pt nanoparticles alloyed with transition metals, post‐transition metals and lanthanides, are discussed, as well as the material characterization and their performance for the ORR. Then, bimetallic Cu nanoalloy catalysts are reviewed and organized according to their main reaction product generated by the second metal. This review concludes with a perspective on nanoalloy catalysts for the ORR and the CO2RR, and proposes future research directions.

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Bimetallic PtCu core-shell nanoparticles in PtCu/C electrocatalysts: Structural and electrochemical characterization

Cited by 48 publications

References 44 publications

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

Влияние термообработки на атомную структуру core-shell наночастиц PtCu в составе электрокатализаторов PtCu/C

Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO₂RR)

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Bimetallic PtCu core-shell nanoparticles in PtCu/C electrocatalysts: Structural and electrochemical characterization

Cited by 48 publications

References 44 publications

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

Влияние термообработки на атомную структуру core-shell наночастиц PtCu в составе электрокатализаторов PtCu/C

Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO2RR)

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Product

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Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO₂RR)