The heat-promoted metal–support interaction of a PtCu/SiO<sub>2</sub> carbon-free catalyst for the methanol oxidation and oxygen reduction reactions

Zhao, Quanqing; Zhi, Han; Yang, Liu; Xu, Feng

doi:10.1039/d3su00193h

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…The electrical conductivity of PtNi/SiO 2 was determined to be 1.56 mS cm –1 , as illustrated in Figure S2. Furthermore, it has been shown that metal oxide/doped-metal oxides, exhibiting reduced electronic conductivity, exhibit enhanced ORR activity in contrast to Pt supported over carbon. , For Pt/C, the observed conductivity was 10.3 mS cm –1 , which is higher compared to PtNi/SiO 2 . This discrepancy arises due to the interconnected nature of carbon particles in Pt/C, facilitating electronic conductivity.…”

Section: Resultsmentioning

confidence: 99%

Surface-Anchored PtNi Alloy Network over SiO₂ (PtNi/SiO₂): A Versatile Carbon-Free Cathode for Proton Exchange Membrane Fuel Cells (PEMFCs)

Kumar,

Yoyakki,

Kurungot

2024

ACS Appl. Eng. Mater.

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The large-scale commercialization of the PEMFCs is hindered due to the high cost of the Pt-based electrocatalysts (Pt/C) and the low durability associated with the oxidation of the carbon support in Pt/C. Many Pt-based carbon-free electrocatalysts have been explored, exhibiting excellent stability and activity, but the performance is further expected to be improved by developing suitable Pt alloy catalysts based on the carbon-free supports. To explore this possibility, we have developed a PtNi/SiO2 alloy system, which acts as a carbon-free electrocatalyst exhibiting enhanced activity for the oxygen reduction reaction (ORR). A half-cell study of PtNi/SiO2 (45 wt%) shows ∼4.3 times higher ORR activity compared to the state-of-the-art Pt/C (40%). The uniform distribution of the PtNi nanoparticles over SiO2 is the crucial feature of the catalyst. PtNi/SiO2 shows better durability even after 5000 cycles compared to the state-of-the-art Pt/C. The catalyst shows a negative shift in the half-wave potential (E 1/2) by only 5 mV, which is lower than that of the 11 mV drop incurred by Pt/C. Considering this high activity of the PtNi/SiO2 catalyst for the ORR, we tried to explore the possibility of demonstrating a single-cell PEMFC in the MEA by pairing the catalyst as the cathode along with the Pt/C as the anode. This paired configuration of the single cell is found to be providing promising performance by delivering a current density of 960 mA/cm2 at 0.60 V and a maximum power density of 835 mW/cm2. Thus, this study outlines the possibility of developing potential alloy combinations of Pt on carbon-free substrates and then deploying them as electrodes for PEMFC applications. In the context of mitigating the carbon corrosion-related issues without compromising the intrinsic activities of the catalysts, the development of suitable alloy combinations on various carbon-free substrates is of significant technological advantages. The formation of the alloy phase along with the fine and uniform distribution of the alloy nanoparticles on the SiO2 substrate, followed by its successful deployment as the cathode of a single cell, points toward the scope of exploring material developments in this direction.

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Section: Resultsmentioning

confidence: 99%

Surface-Anchored PtNi Alloy Network over SiO₂ (PtNi/SiO₂): A Versatile Carbon-Free Cathode for Proton Exchange Membrane Fuel Cells (PEMFCs)

Kumar,

Yoyakki,

Kurungot

2024

ACS Appl. Eng. Mater.

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“…SiO 2 was also developed as a support for the PtCu catalyst [62] by Zhao's group. TEM images of PtCu/SiO 2 -40% revealed that the metal nanoparticles were closely attached to the SiO 2 nanospheres, indicating a strong interaction between PtCu alloy and SiO 2 nanospheres, which is demonstrated in Figure 2b.…”

Section: Metal Oxide Support Modificationmentioning

confidence: 99%

“…SiO 2 [62] CuSiO 3 [63] TiO 2−x N [12] Pr 0.15 Ce 0.85 O 2 [64] Reactant Selection and Synthesis Strategies…”

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confidence: 99%

Recent Advances of PtCu Alloy in Electrocatalysis: Innovations and Applications

Shen,

Tang,

Shen

2024

Catalysts

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Developing highly active and durable platinum-based catalysts is crucial for electrochemical renewable energy conversion technologies but the limited supply and high cost of platinum have hindered their widespread implementation. The incorporation of non-noble metals, particularly copper, into Pt catalysts has been demonstrated as an effective solution to reduce Pt consumption while further promoting their performance, making them promising for various electrocatalytic reactions. This review summarizes the latest advances in PtCu-based alloy catalysts over the past several years from both synthetic and applied perspectives. In the synthesis section, the selection of support and reagents, synthesis routes, as well as post-treatment methods at high temperatures are reviewed. The application section focuses not only on newly proposed electrochemical reactions such as nitrogen-related reactions and O2 reduction but also extends to device-level applications. The discussion in this review aims to provide further insights and guidance for the development of PtCu electrocatalysts for practical applications.

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Exploring Pt-Cu synergistic effects on porous SiO2 support with different Pt loadings for low-temperature oxidation of CO and C3H6

Farhan,

Wang,

Yin

et al. 2024

Journal of Environmental Chemical Engineering

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The heat-promoted metal–support interaction of a PtCu/SiO₂ carbon-free catalyst for the methanol oxidation and oxygen reduction reactions

Abstract: Pt shows excellent catalytic activity towards the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR), but suffers from deactivation due to the weak interaction with the carbon support and the oxidation of carbon.

Cited by 3 publications

References 32 publications

Surface-Anchored PtNi Alloy Network over SiO₂ (PtNi/SiO₂): A Versatile Carbon-Free Cathode for Proton Exchange Membrane Fuel Cells (PEMFCs)

Surface-Anchored PtNi Alloy Network over SiO₂ (PtNi/SiO₂): A Versatile Carbon-Free Cathode for Proton Exchange Membrane Fuel Cells (PEMFCs)

Recent Advances of PtCu Alloy in Electrocatalysis: Innovations and Applications

Exploring Pt-Cu synergistic effects on porous SiO2 support with different Pt loadings for low-temperature oxidation of CO and C3H6

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The heat-promoted metal–support interaction of a PtCu/SiO2 carbon-free catalyst for the methanol oxidation and oxygen reduction reactions

Abstract: Pt shows excellent catalytic activity towards the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR), but suffers from deactivation due to the weak interaction with the carbon support and the oxidation of carbon.

Cited by 3 publications

References 32 publications

Surface-Anchored PtNi Alloy Network over SiO2 (PtNi/SiO2): A Versatile Carbon-Free Cathode for Proton Exchange Membrane Fuel Cells (PEMFCs)

Surface-Anchored PtNi Alloy Network over SiO2 (PtNi/SiO2): A Versatile Carbon-Free Cathode for Proton Exchange Membrane Fuel Cells (PEMFCs)

Recent Advances of PtCu Alloy in Electrocatalysis: Innovations and Applications

Exploring Pt-Cu synergistic effects on porous SiO2 support with different Pt loadings for low-temperature oxidation of CO and C3H6

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The heat-promoted metal–support interaction of a PtCu/SiO₂ carbon-free catalyst for the methanol oxidation and oxygen reduction reactions

Surface-Anchored PtNi Alloy Network over SiO₂ (PtNi/SiO₂): A Versatile Carbon-Free Cathode for Proton Exchange Membrane Fuel Cells (PEMFCs)

Surface-Anchored PtNi Alloy Network over SiO₂ (PtNi/SiO₂): A Versatile Carbon-Free Cathode for Proton Exchange Membrane Fuel Cells (PEMFCs)