Boosting Oxygen and Peroxide Reduction Reactions on PdCu Intermetallic Cubes

Zhang, Qingfeng; Fan, Li; Lin, Lina; Peng, Jiaheng; Zhang, Wencong; Chen, Wenlong; Xiang, Qian; Shi, Fenglei; Shang, Wen; Tao, Peng; Song, Chengyi; Zhu, Hong; Deng, Tao; Wu, Jianbo

doi:10.1002/celc.202000381

Cited by 9 publications

(10 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To begin, we considered that organophosphorus compounds like triphenylphosphine (TPP), trioctylphosphine oxide (TOPO), and TOP have been used as capping agents in the synthesis of cubic metal NPs, in which the expression of {100} facets has been facilitated. − For example, TOP was used to synthesize cubic PdCu NPs in the presence of OLA, whereas spherical PdCu NPs were obtained without TOP. , Then, the synthesis of Pd 2 Sn NPs was carried out with OA omitted to promote the role of TOP in facet expression. Figure a shows a TEM image of the obtained NPs, with nanorhombohedra as the majority product (70% of NPs).…”

Section: Results and Discussionmentioning

confidence: 99%

Phase-Controlled Synthesis of Pd–Sn Nanocrystal Catalysts of Defined Size and Shape

Bueno

Zhan

Wolfe

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Bimetallic Pd-based nanoparticles (NPs) are of interest as electrocatalysts for formic acid electrooxidation (FAEO) because of their higher initial catalytic activity and CO tolerance when compared to Pt. Intermetallic NPs (i-NPs) with specific geometric and electronic structures generally exhibit superior catalytic activity, selectivity, and durability when compared to their disordered (random alloy) counterparts; however, the colloidal synthesis of i-NPs remains a challenge. Here, a one-pot method was demonstrated as a facile route to obtain monodisperse Pd−Sn NPs with phase control, including intermetallic hexagonal Pd 3 Sn 2 (P6 3 /mmc), intermetallic orthorhombic Pd 2 Sn (Pnma), and alloy cubic Pd 3 Sn (FCC, Fm3m) as size-controlled NPs with quasi-spherical shapes. Initial metal precursor ratios and reaction temperature were critical parameters to achieving phase control. Also, slight modifications of synthetic conditions resulted in either Pd 2 Sn nanorhombohedra or nanorods with tunable aspect ratios. A systematic evaluation of the Pd−Sn NPs for FAEO showed that most presented higher specific activities when compared to commercial Pd/C, in which Pd 2 Sn quasi-spheres and nanorhombohedra showed the highest catalytic activity for FAEO. These results highlight the benefits of phase-controlled Pd-based nanocatalysts with defined nanocrystal size and shape, with use of trioctylphospine (TOP) and oleic acid (OA) central to shape and size control.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Phase-Controlled Synthesis of Pd–Sn Nanocrystal Catalysts of Defined Size and Shape

Bueno

Zhan

Wolfe

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Under the existence of capping agents, the reaction time and temperatures can influence the atomic diffusion and reduction rates during synthesis. Using triphenylphosphine, which has the similar role to trioctylphosphine, as the capping agent, increasing reaction temperature from 170 to 220 °C made the morphology of PdCu intermetallics change from nanocubes to nanoparticles . Another important capping agent is halide ion, which can control the morphology of Pd-based intermetallics and promote the atomic ordering of nanocrystals.…”

Section: Synthetic Strategies Of Intermetallicsmentioning

confidence: 99%

Intermetallic Nanocrystals for Fuel-Cells-Based Electrocatalysis

Lin,

Li,

Zeng

et al. 2023

Chem. Rev.

View full text Add to dashboard Cite

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.

show abstract

“…Moreover, the EDS analysis of the PCZT sample confirmed the presence of alloys with a higher concentration of PdCu alloys or intermetallic oxides, as reported in previous studies. [85,86] Figure 10a displays the SEM images of the PCZT sample, revealing the presence of various micro and nanoscale structures.…”

Section: Examination Of Characterization Details Of the Pczt Catalystmentioning

confidence: 99%

Synthesis of Vinyl Acetate Monomer Over PdCu Alloys: The Role of Surface Oxygenation in the Reaction Path

Gonzalez Caranton,

Schmal,

Checca Huaman

et al. 2023

Macro Reaction Engineering

View full text Add to dashboard Cite

This work uses sol–gel and sonochemical methods to prepare bimetallic PdCu catalysts supported on modified ZrO2 with Ti and Al. The catalysts are tested for vinyl acetate synthesis from ethylene, acetic acid, and oxygen, varying the reaction temperature for two catalysts prepared, which show higher activity. Catalysts characterization results show bimetallic species and distort alloys with a dispersed distribution of active metal onto the support. The in situ reaction by DRIFT‐MS identifies the surface formation of main intermediates like palladium acetate monomers and mono and bidentate intermediates, associated to vinyl acetate formation, like vinyl hydrogenated species over PdCu. Finally, this behavior will be attributed to the bimetallic distortions of PdCu samples, provided by interaction effects between PdCu and supports, indicating a more exposition of PdCu species suitable for the reaction, according to high‐resolution transmission microscopy electron microscopy results for PdCu/ZrTi sample. Thus, this sample exhibits a minimal formation of sub‐products and catalytic stability for 18 hh. These results evidence the participation of hydroxyls and oxygen vacancies of the catalyst in the catalytic reaction measured in situ, monitoring the products formed at the reactor outlet. Finally, it is proposed a reaction pathway as a function of reaction conditions.

show abstract

Boosting Oxygen and Peroxide Reduction Reactions on PdCu Intermetallic Cubes

Cited by 9 publications

References 62 publications

Phase-Controlled Synthesis of Pd–Sn Nanocrystal Catalysts of Defined Size and Shape

Phase-Controlled Synthesis of Pd–Sn Nanocrystal Catalysts of Defined Size and Shape

Intermetallic Nanocrystals for Fuel-Cells-Based Electrocatalysis

Synthesis of Vinyl Acetate Monomer Over PdCu Alloys: The Role of Surface Oxygenation in the Reaction Path

Contact Info

Product

Resources

About