Impact of platinum loading and dispersion on the catalytic activity of Pt/SnO2 and Pt/α-Fe2O3

Marić, Ivan; Dražić, Goran; Radin, Edi; Peter, Robert; Škrabić, M.; Jurkin, Tanja; Pustak, Anđela; Baran, Nikola; Mikac, Lara; Ivanda, Mile; Petravić, M.; Štefanić, Goran; Gotić, Marijan

doi:10.1016/j.apsusc.2022.155073

Cited by 16 publications

(7 citation statements)

References 36 publications

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“…Pt4f regions (Figure 4 [a, d]) were fitted with two components for both samples. The main component relevant to Pt(0), with BE (Pt4f7/2) = 71.2 ± 0.2 eV and a minor contribution attributable to Pt (II) species with BE (Pt4f7/2) = 72.6 ± 0.2 eV, in agreement with literature data 21 . Pt(0) percentages, estimated as the ratio of the Pt(0) doublets area over the total platinum signal area, were equal to 78% and 64% for CoO/PtPd and CoO/PtPd/r‐GO thin films, respectively.…”

Section: Resultssupporting

confidence: 91%

Enhanced Catalytic Performance and Tolerance to Carbon Monoxide Poisoning of CoO/PtPd/r‐GO Nanocomposite Thin Film for Methanol Fuel Cells

Eskandari,

Hoseini,

Bahrami

et al. 2024

Applied Organom Chemis

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This study presents the facile synthesis of CoO/PtPd and CoO/PtPd/reduced‐graphene oxide (r‐GO) nanocomposites, highlighting their significant role in methanol fuel cells. To create a CoO/PtPd thin film at the toluene/water interface, we employed NaBH4 to effectively reduce PtCl2(COD), PdCl2(COD), and Co (acac)3 (COD = cis,cis‐1,5‐ cyclooctadiene, acac = acetylacetonate). The two nanocomposites were analyzed using XRD, FE‐SEM, AFM, XPS, BET, and TEM techniques. In the electrooxidation of methanol in the anodic part of fuel cell, cobalt (II) oxide can serve as an oxygen source in the catalytic oxidation of carbon monoxide (CO) or it can play a role in producing the HO‐CoO intermediate to facilitate the oxidation of CO‐PtPd to carbon dioxide (CO2). This reaction can help eliminate CO, which is a common poison for Pt‐based catalysts in methanol oxidation. Our research reveals significant improvements in current densities and catalyst tolerance when using the CoO/PtPd/r‐GO nanocomposite thin film. The observed current density for CoO/PtPd/r‐GO is 263.33 mA.cm−2, surpassing the reported value of 30.00 mA.cm−2 for PtPd/r‐GO. The jf/jb ratios, commonly used to evaluate catalyst tolerance, are approximately 2.80 for CoO/PtPd and 4.98 for CoO/PtPd/r‐GO, in contrast to ratios larger than 0.99 for ETEK Pt and 0.58 for other types of commercial Pt/C. These findings indicate that the CoO/PtPd/r‐GO thin film exhibits enhanced catalytic performance and improved tolerance to CO poisoning. Furthermore, the power output calculated for CoO/PtPd/r‐GO is 104.5 mW·cm−2, which is comparable to the reported value of 48.03 mW·cm−2 for commercial Pt/C. These results demonstrate the potential of the CoO/PtPd/r‐GO nanocomposite thin film as a promising alternative to traditional catalyst materials in methanol fuel cells.

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Section: Resultssupporting

confidence: 91%

Enhanced Catalytic Performance and Tolerance to Carbon Monoxide Poisoning of CoO/PtPd/r‐GO Nanocomposite Thin Film for Methanol Fuel Cells

Eskandari,

Hoseini,

Bahrami

et al. 2024

Applied Organom Chemis

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“…The XPS results (Figure 9 and Table 4) show that the average oxidation state (AOS) of platinum is relatively low, with a minimum of 0.4 for sample SP3 and a maximum of 1.25 for sample SP15. On the other hand, the AOS of PtNPs determined in previous work, with a size of about 1 nm (see Ref [18,20] and Table 4), is about two to four times higher than the values determined in this work. It is well known that non-stoichiometry dominates with decreasing particle size.…”

Section: Discussioncontrasting

confidence: 76%

“…Comprehensive details of these outcomes, including numerical values, are provided in Supplementary Table S1. Meanwhile, Table 4 encapsulates the XPS-derived average oxidation states (AOS) of platinum (Pt) and tin (Sn) achieved in this investigation, juxtaposed with findings from reference [18]-a comparison elaborated upon in the ensuing discussion. S1.…”

Section: Xps Resultsmentioning

confidence: 95%

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Microwave-Assisted Synthesis of Pt/SnO2 for the Catalytic Reduction of 4-Nitrophenol to 4-Aminophenol

Đurasović,

Štefanić,

Dražić

et al. 2023

Nanomaterials

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In this study, we present a new approach for the synthesis of Pt/SnO2 catalysts using microwave radiation. Pt(IV) and Sn(IV) inorganic precursors (H2PtCl6 and SnCl4) and ammonia were used, which allowed the controlled formation of platinum particles on the anisotropic SnO2 support. The synthesized Pt/SnO2 samples are mesoporous and exhibit a reversible physisorption isotherm of type IV. The XRD patterns confirmed the presence of platinum maxima in all Pt/SnO2 samples. The Williamson-Hall diagram showed SnO2 anisotropy with crystallite sizes of ~10 nm along the c-axis (< 00l >) and ~5 nm along the a-axis (< h00 >). SEM analysis revealed anisotropic, urchin-like SnO2 particles. XPS results indicated relatively low average oxidation states of platinum, close to Pt metal. 119Sn Mössbauer spectroscopy indicated electronic interactions between Pt and SnO2 particles. The synthesized samples were used for the catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of excess NaBH4. The catalytic activity of the Pt/SnO2 samples for the reduction of 4-NP to 4-AP was optimized by varying the synthesis parameters and Pt loading. The optimal platinum loading for the reduction of 4-NP to 4-AP on the anisotropic SnO2 support is 5 mol% with an apparent rate constant k = 0.59 × 10–2 s–1. The Pt/SnO2 sample showed exceptional reusability and retained an efficiency of 81.4% after ten cycles.

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“…Therefore, significant efforts have been devoted to heterogeneous interfacial engineering for designing highly efficient Pt-based electrocatalysts. − By selecting the appropriate active materials to couple with Pt metal, strong electronic and/or chemical interaction could be achieved at the interface, thus optimizing the adsorption ability for Pt sites. − Meanwhile, the additional active sites provided by coupled materials also allow separate reaction steps for the electrochemical process. , For MOR catalysis, the post-transition metal oxide of tin oxide (SnO 2 ) with high stability in acid/alkaline electrolyte media has been proved to modulate the electronic occupation of Pt d-orbits by constructing Pt/SnO 2 interface and thus optimizes the adsorption ability toward reaction intermediates on Pt sites. − Meanwhile, the SnO 2 with strong OH* adsorption ability also facilitates the formation of adsorbed OH* species via dissociative adsorption of water at low potentials and subsequently proceeds the bifunctional mechanism to oxidize and remove the adsorbed CO* on Pt sites. − However, due to the strong adsorption ability, the desorption of adsorbed OH* species from SnO 2 requires overcoming high energy barriers, which hinders the subsequent reaction with CO* and limits the removal of poisoning species on active sites, resulting in the insufficient antipoisoning ability of catalysts.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Intermediate Adsorption on Pt Sites via Triple-Phase Interface Electronic Exchange for Methanol Oxidation

Chen,

Wang,

Chen

et al. 2024

Inorg. Chem.

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For the most commonly applied platinum-based catalysts of direct methanol fuel cells, the adsorption ability toward reaction intermediates, including CO and OH, plays a vital role in their catalytic activity and antipoisoning in anodic methanol oxidation reaction (MOR). Herein, guided by a theoretical mechanism study, a favorable modulation of the electronic structure and intermediate adsorption energetics for Pt active sites is achieved by constructing the triple-phase interfacial structure between tin oxide (SnO 2 ), platinum (Pt), and nitrogen-doped graphene (NG). From the strong electronic exchange at the triple-phase interface, the adsorption ability toward MOR reaction intermediates on Pt sites could be efficiently optimized, which not only inhibits the adsorption of CO* on active sites but also facilitates the adsorption of OH* to strip the poisoning species from the catalyst surface. Accordingly, the resulting catalyst delivers excellent catalytic activity and antipoisoning ability for MOR catalysis. The mass activity reaches 1098 mA mg −1 Pt , 3.23 times of commercial Pt/C. Meanwhile, the initial potentials and main peak for CO oxidation are also located at a much lower potential (0.51 and 0.74 V) against commercial Pt/C (0.83 and 0.89 V).

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Impact of platinum loading and dispersion on the catalytic activity of Pt/SnO2 and Pt/α-Fe2O3

Cited by 16 publications

References 36 publications

Enhanced Catalytic Performance and Tolerance to Carbon Monoxide Poisoning of CoO/PtPd/r‐GO Nanocomposite Thin Film for Methanol Fuel Cells

Enhanced Catalytic Performance and Tolerance to Carbon Monoxide Poisoning of CoO/PtPd/r‐GO Nanocomposite Thin Film for Methanol Fuel Cells

Microwave-Assisted Synthesis of Pt/SnO2 for the Catalytic Reduction of 4-Nitrophenol to 4-Aminophenol

Optimizing Intermediate Adsorption on Pt Sites via Triple-Phase Interface Electronic Exchange for Methanol Oxidation

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