Synthesis of branched Pd nanocrystals with tunable structures, their growth mechanism, and enhanced electrocatalytic properties

Guo, Xueli; Tan, Yiwei

doi:10.1039/c5cp05531h

Cited by 10 publications

(4 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This preliminary study is in-line to those carried out by other groups with similar samples. 32,57,58 While the capping ligands employed during a NC synthesis are key to shape-control and preventing aggregation, they can also be detrimental to the catalytic activity by blocking access of reactant molecules to the active surface atoms. Therefore, it is of the highest importance to 'clean' the NC surfaces without inducing structural changes.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, the formation of highly branched nanostructures requires growth under conditions that typically favour kinetic products. To date, a range of branched nanostructures have been synthesized for various noble metals, including Pt, [27][28][29] Pd, 3,[30][31][32] Au, 33,34 Ag, 35 and Ru. 36 However, the fast rate of kinetically controlled growth makes it difficult to control the final particle size, with branched structures >100 nm being produced.…”

Section: -26mentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and catalytic properties of highly branched palladium nanostructures using seeded growth

et al. 2016

View full text Add to dashboard Cite

Access to the full text of the published version may require a subscription. In order to develop nanocatalysts with enhanced catalytic performance, it is important to be able to synthesize nanocrystals enclosed by high-index surface facets, due to their high denisty of low coordinated atoms at step, ledge and kink sites. Here, we report a facile seed-mediated route to the synthesis of highly branched Pd nanostructures with a combination of {113}, {115} and {220} high-index surface planes. The size of these nanostructures is readily controlled by a simple manipulation of the seed concentration. The selective use of oleylamine and oleic acid was also found to be critical to the synthesis of these structures, with Pd icosahedra enclosed by low-index {111} facets being produced when hexadecylamine was employed as capping ligand. The structure-property relationship of these nanostructures as catalysts in Suzuki-cross coupling reactions was then investigated and compared, with the high-index faceted branched Pd nanostructures found to be the most effective catalysts. Rights

show abstract

Section: Resultsmentioning

confidence: 99%

Section: -26mentioning

confidence: 99%

Synthesis and catalytic properties of highly branched palladium nanostructures using seeded growth

et al. 2016

View full text Add to dashboard Cite

show abstract

“…b-Pd-NCs core was prepared following our previous work and the representative characterization results are presented in Fig. S1 in the Supplementary Materials 40 . Fig.…”

Section: Resultsmentioning

confidence: 99%

Branched Pd@Rh core@shell nanocrystals with exposed Rh {100} facets: an effective electrocatalyst for hydrazine electro-oxidation

Wang

Jing

Tan

2017

Sci Rep

Self Cite

View full text Add to dashboard Cite

Shape control of noble metal (NM) nanocrystals (NCs) is of great importance for improving their electrocatalytic performance. In this report, branched Pd@Rh core@shell NCs that have right square prism-like arms with preferential exposure of Rh {100} facets (denoted as b-Pd@Rh-NCs thereafter) are synthesized and utilized as an electrocatalyst for the hydrazine electrooxidation (HEO) in acidic and alkaline electrolytes. The b-Pd@Rh-NCs are obtained by the heteroepitaxial growth of Rh on the pre-formed branched Pd NCs (denoted as b-Pd-NCs thereafter) core in the presence of poly(vinyl pyrrolidone) (PVP) and bromide ions. A comparative analysis of the voltammetric data for the HEO shows a higher activity on the b-Pd@Rh-NCs exposed with Rh {100} faces than on Rh black, the b-Pd-NCs, and Pd black in acid and alkaline solutions, indicating a structure sensitivity of the reaction. Analysis of the products from the b-Pd@Rh-NCs catalysed HEO reveals a very high hydrazine fuel efficiency, as determined by on-line differential electrochemical mass spectrometry (DEMS).

show abstract

“…The kinetically controlled overgrowth is based on regulation of the growth rate at which atoms are generated and added to the surface of a seed, and the final products obtained from kinetically controlled overgrowth are not limited by thermodynamic confinement, allowing for the formation of NCs with polyhedral structure. Experimentally, the kinetically controlled overgrowth involved in synthesis of polyhedral Pd NCs can be achieved by adjusting a series of parameters, including the concentrations of Pd precursor, the reaction temperature, the introduction of ionic species, or a combination of them [58][59][60] . For example, Tilley et al 61 have reported the synthesis of highly branched Pd NCs with a combination of {113}, {115}, and {220} high-index facets on the surface by using oleylamine (OAm) and oleic acid (OA) with a molar ratio about 1 : 1 acted as capping agent, the average size of the branched Pd NCs is about 37 nm (Fig.…”

Section: Common Strategies For Controllable Synthesis Of Polyhedral Pd Ncsmentioning

confidence: 99%

Controllable Synthesis of Pd Nanocrystals for Applications in Fuel Cells

Han¹,

Tong²,

LI³

2016

Acta Physico-Chimica Sinica

View full text Add to dashboard Cite

The properties of Pd nanocrystals (NCs) intended for use in electrocatalytic applications greatly depend on their surface structures and morphologies. Recent developments in the shape-controlled synthesis of polyhedral Pd NCs represent a promising means of precisely tuning their electrocatalytic properties, and thus may enable the performance enhancement of electrocatalytic Pd NCs. In this comprehensive review, we concentrate on the most important current research concerning the shape-controlled synthesis of polyhedral Pd NCs and their electrocatalytic applications in fuel cells. After a brief introduction to the general NC growth mechanisms and the relationship between their surface structures and shapes, we focus on a variety of shapecontrolled synthesis strategies that have been explored to control the fabrication of polyhedral Pd NCs. This review also examines the applications of Pd NCs to the electrocatalytic oxidation of formic acid, methanol, and ethanol as well as the reduction of O2, with an emphasis on their use in fuel cells. Finally, we outline our personal perspectives on future research directions that are underway with regard to catalytic uses of polyhedral Pd NCs.

show abstract

Synthesis of branched Pd nanocrystals with tunable structures, their growth mechanism, and enhanced electrocatalytic properties

Cited by 10 publications

References 49 publications

Synthesis and catalytic properties of highly branched palladium nanostructures using seeded growth

Synthesis and catalytic properties of highly branched palladium nanostructures using seeded growth

Branched Pd@Rh core@shell nanocrystals with exposed Rh {100} facets: an effective electrocatalyst for hydrazine electro-oxidation

Controllable Synthesis of Pd Nanocrystals for Applications in Fuel Cells

Contact Info

Product

Resources

About