Structure sensitive chemical reactivity by palladium concave nanocubes and nanoflowers synthesised by a seed mediated procedure in aqueous medium

Sreedhala, S.; Sudheeshkumar, V.; Vinod, C. P.

doi:10.1039/c4nr01283f

Cited by 32 publications

(23 citation statements)

References 36 publications

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“…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%

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

et al. 2016

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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

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Section: Resultsmentioning

confidence: 99%

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

et al. 2016

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“…For the catalytic properties of Pd nanocrystals with specific shapes and facets, the recent studies have been reported towards eletro‐oxidation and Suzuki coupling reactions . In the eletro‐oxidation of methanol, the existence of low‐coordinate atomic steps and kinks on the surface of Pd‐CNs were responsible for the superior activity.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of palladium concave Nanocubes with high‐index facets and their catalytic properties

Cui

Bai

Liu

et al. 2017

Applied Organom Chemis

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Palladium nanocrystals with a variety of shapes have received particular interest in recent years due to their unique properties in catalysis. Herein, Pd concave nanocubes with high-index facets (Pd-CNs) was synthesized by a simple waterbased route without seeds using L-ascorbic acid (AA) as the reduction agent in the presence of CTAB. X-ray diffraction and transmission electron microscopy were employed to demonstrate the formation of concave structures with high-index facets of the Pd-CNs with an average size of 17.5 nm. The as-prepared Pd-CNs presented significantly higher catalytic activity than commercial Pd/C (an average particle size of 4.7 nm) in the electro-oxidation of methanol, but exhibited weaker property in Suzuki coupling reaction, which provided an evidence for the effect of shape and size on different reactions.

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“…To date, seed-mediated synthesis has been the most commonly used method for preparing concave noble metal nanoparticles. [29][30][31][32][33][34][35][36][37] In this method, seed particles with various seed shapes depending on the original reagents, such as spheres, cubes, cuboctahedrons, and rhombic dodecahedrons, are produced from seed solutions. Meanwhile, the growth solutions, in which seeds grow into concave nanoparticles, contain metal precursors, reducing agents, and structure-directing agents/surfactants/capping agents.…”

Section: Seed-mediated Synthesismentioning

confidence: 99%

“…Sreedhala et al successfully prepared Pd concave nanocubes from a seed solution via two reaction stages, including: 1) the preparation of seed Pd nanospheres and 2) the subsequent synthesis of seed Pd nanocubes in the presence of surfactant cetyltrimethylammonium bromide (CTAB) ( Figure 3A,B). [36] The obtained Pd nanocubes were then transformed into concave nanocubes in the presence of cetyltrimethylammonium chloride (CTAC) ( Figure 3C). Although the described method consisted of three stages, the relatively low reaction temperature (25-30 °C) and short reaction time (30-45 min) allowed its easy implementation.…”

Section: Seed-mediated Synthesismentioning

confidence: 99%

In Search of Excellence: Convex versus Concave Noble Metal Nanostructures for Electrocatalytic Applications

et al. 2021

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Controlling the shape of noble metal nanoparticles is a challenging but important task in electrocatalysis. Apart from hollow and nanocage structures, concave noble metal nanoparticles are considered a new class of unconventional electrocatalysts that exhibit superior electrocatalytic properties as compared with those of conventional nanoparticles (including convex and flat ones). Herein, several facile and highly reproducible routes for synthesizing nanostructured concave noble metal materials reported in the literature are discussed, together with their advantages over noble metal nanoparticles with convex shapes. In addition, possible ways of optimizing the synthesis procedure and enhancing the electrocatalytic characteristics of concave metal nanoparticles are suggested. Nanostructured noble metals with concave features are found to show better catalytic activity and stability hence improve their practical applicability in electrocatalysis.

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Structure sensitive chemical reactivity by palladium concave nanocubes and nanoflowers synthesised by a seed mediated procedure in aqueous medium

Cited by 32 publications

References 36 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

Synthesis of palladium concave Nanocubes with high‐index facets and their catalytic properties

In Search of Excellence: Convex versus Concave Noble Metal Nanostructures for Electrocatalytic Applications

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