Precisely tuning the electronic structure of ordered PtFe alloy supported on multi-walled carbon nanotubes for enhanced methanol oxidation

Zhou, Qian; An, Yan; Zhou, Shangyan; Wang, Zhengcheng; Long, Jin; Liao, Wei; Chen, Meida; Wang, Qingmei

doi:10.1016/j.jallcom.2022.168347

Cited by 8 publications

(7 citation statements)

References 52 publications

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“…This indicates that Pt 1 Co 3 /MWCNTs exhibit better durability and resistance to CO poisoning, which is crucial for long-term stability in practical applications. 20,30 In addition, the cyclic durability measurements further verified its superior stability. As shown in Figure 4b,d, Pt 1 Co 3 /MWCNT catalysts have only a small loss of 20.33% in current density after 600 cycles, while the other counterparts and commercial Pt/C exhibited much larger current density losses under the same conditions, further indicating that Pt 1 Co 3 /MWCNTs exhibit improved electrochemical stability.…”

Section: ■ Results and Discussionmentioning

confidence: 85%

Electronic Structure Effect of PtCo Alloy with Adjustable Compositions for Efficient Methanol Electrooxidation

Zheng,

Wang,

Ren

et al. 2023

Langmuir

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Various efficient strategies have been developed to overcome the anodic electrocatalyst issue of methanol-based fuel cells owing to their complicated methanol electrooxidation mechanism. In this work, PtCo nanoparticles with adjustable compositions supported on multiwalled carbon nanotubes (Pt 1 Co x /MWCNTs) through the adsorbing−coating−annealing− etching route were synthesized. Compared with the Pt/C catalyst, Pt 1 Co 3 /MWCNTs exhibit better electrocatalytic MOR activity in both activity and durability. Notably, the electrochemical mass and specific activity of the as-prepared catalyst are 1.04 mA μg −1 Pt and 2.18 mA cm −2 , respectively, which are higher than those of the Pt/ C catalyst. Moreover, the as-prepared sample revealed lower onset potential during the CO stripping test. Furthermore, the Pt 1 Co 3 / MWCNTs possess a lower current density decrease rate in chronoamperometry and cyclic durability tests. The enhancement of activity and stability of Pt 1 Co 3 /MWCNTs could be ascribed to their ordered morphological structure, the electronic interaction between MWCNTs and PtCo nanoparticles, and the suitable electronic structure effect between Pt/Co ratios. The concept of the catalyst design in this study offers a different guideline for constructing the novel methanol electrooxidation catalyst, which will accelerate the widespread fuel cell practical application.

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Section: ■ Results and Discussionmentioning

confidence: 85%

Electronic Structure Effect of PtCo Alloy with Adjustable Compositions for Efficient Methanol Electrooxidation

Zheng,

Wang,

Ren

et al. 2023

Langmuir

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“…Therefore, it is hard to achieve fully ordering of metal nanocrystals unless the annealing temperature is elevated. − In addition, the covered protective agents must be removable to create exposed nanocrystals during post-treatment by acid, base, and beyond for further electrocatalytic applications. Typically, the common protective agents are metal oxides, silicon, polymer, and various carbon materials, etc., which can meet the above requirements for protecting nanoparticles from agglomeration. ,− These protective covertures can be synthesized by the separate nucleation of additional metals, sol–gel formation of silicon-based shells, the polymerization of adsorbed small molecules or the self-assembly of organic ligands and metal ions. The rational design of the protective layer will achieve the successful transformation from disordered alloys with high Gibbs free energy to thermodynamically favorable intermetallics while maintaining the initial structure of nanocrystals.…”

Section: Synthetic Strategies Of Intermetallicsmentioning

confidence: 99%

“…Instantly, ∼0.5 nm ultrathin carbon shell was found to effectively restrain the sintering of PtZn nanoparticles during disorder−order transformation and meanwhile exhibit high permeability for reactants to obtain triggered FAOR activity and stability. 153 Other carbon materials like CNTs 139 and porous graphitic carbon 794 have also been explored as enhanced supports for C1 molecule catalysis.…”

Section: Anodic Fuel Oxidation Reactionsmentioning

confidence: 99%

“…Split of CO oxidation peaks were observed and ascribed to the coexistence of ordered and disordered phases . However, different interpretation was applied that the splitting CO stripping peaks may derive from the uneven average size of nanoparticles or the multi-ingredients on the surface. ,, Such an ambiguous controversy makes it less persuasive for scholars to identify the ordered extent of nanocrystals by mere CO stripping.…”

Section: Characterization Technique Of Intermetallicsmentioning

confidence: 99%

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Intermetallic Nanocrystals for Fuel-Cells-Based Electrocatalysis

Lin,

Li,

Zeng

et al. 2023

Chem. Rev.

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Electrocatalysis underpins the renewable electrochemical conversions for sustainability, which further replies on metallic nanocrystals as vital electrocatalysts. Intermetallic nanocrystals have been known to show distinct properties compared to their disordered counterparts, and been long explored for functional improvements. Tremendous progresses have been made in the past few years, with notable trend of more precise engineering down to an atomic level and the investigation transferring into more practical membrane electrode assembly (MEA), which motivates this timely review. After addressing the basic thermodynamic and kinetic fundamentals, we discuss classic and latest synthetic strategies that enable not only the formation of intermetallic phase but also the rational control of other catalysis-determinant structural parameters, such as size and morphology. We also demonstrate the emerging intermetallic nanomaterials for potentially further advancement in energy electrocatalysis. Then, we discuss the state-of-the-art characterizations and representative intermetallic electrocatalysts with emphasis on oxygen reduction reaction evaluated in a MEA setup. We summarize this review by laying out existing challenges and offering perspective on future research directions toward practicing intermetallic electrocatalysts for energy conversions.

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“…In turn, ultrafine Pt-covered Fe 2 P is a robust electrocatalyst for methanol and ethanol electro-oxidation [ 37 ]. A further example is a PtFe alloy supported on multiwalled carbon nanotubes, which displays better activity, stability, and a better anti-CO poisoning ability in methanol electro-oxidation than those of commercial Pt/C [ 38 ]. Moreover, a PtFe/C nanocatalyst has proven to be 10 times more active than commercial Pt/C is during ethanol electro-oxidation [ 39 ].…”

Section: Introductionmentioning

confidence: 99%

Glycerol Electro-Oxidation in Alkaline Medium with Pt-Fe/C Electrocatalysts Synthesized by the Polyol Method: Increased Selectivity and Activity Provided by Less Expensive Catalysts

2023

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We have investigated platinum catalysts containing iron as a modifier to obtain catalysts with superior electrocatalytic activity toward glycerol electro-oxidation in an alkaline medium. The electrocatalysts, supported on carbon Vulcan, were synthesized by the polyol method. The physicochemical characterization data showed that the metals were well distributed on the carbon support and had small particle size (2 nm). The Pt:Fe metal ratio differed from the nominal composition, indicating that reducing iron with platinum was difficult, even though some parameters of the synthesis process were changed. Electrochemical analyses revealed that PtFe/C was more active and stable than commercial Pt/C was, and analysis of the electrolysis by-products showed that iron addition to Pt/C boosted the glycerol conversion and selectivity for glyceric acid formation.

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Precisely tuning the electronic structure of ordered PtFe alloy supported on multi-walled carbon nanotubes for enhanced methanol oxidation

Cited by 8 publications

References 52 publications

Electronic Structure Effect of PtCo Alloy with Adjustable Compositions for Efficient Methanol Electrooxidation

Electronic Structure Effect of PtCo Alloy with Adjustable Compositions for Efficient Methanol Electrooxidation

Intermetallic Nanocrystals for Fuel-Cells-Based Electrocatalysis

Glycerol Electro-Oxidation in Alkaline Medium with Pt-Fe/C Electrocatalysts Synthesized by the Polyol Method: Increased Selectivity and Activity Provided by Less Expensive Catalysts

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