Hydrothermal Synthesis of Ultrasmall Pt Nanoparticles as Highly Active Electrocatalysts for Methanol Oxidation

Ji, Wenxin; Qi, Weihong; Tang, Shasha; Peng, Hongcheng; Li, Siqi

doi:10.3390/nano5042203

Cited by 46 publications

(20 citation statements)

References 22 publications

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“…The nanoparticles were synthetized using H 2 PtCl 6 .6H 2 O as Pt precursor and PVP as stabilizer The procedure was adapted from refs. [36, 37, 38], and is described in Supporting Information (section 2). Prior to their use in the MOF synthesis, Pt nanoparticles (Pt‐NPs) were characterized in depth (section 2 in Supporting Information), and TEM observations evidenced that the Pt nanoparticles possess an average diameter of 3.5 nm.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Properties of MOF‐808 via Defect Engineering and Metal Nanoparticle Encapsulation

Hardian

Dissegna

Ullrich

et al. 2021

Chemistry A European J

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Defect engineering and metal encapsulation are considered as valuable approaches to fine‐tune the reactivity of metal–organic frameworks. In this work, various MOF‐808 (Zr) samples are synthesized and characterized with the final aim to understand how defects and/or platinum nanoparticle encapsulation act on the intrinsic and reactive properties of these MOFs. The reactivity of the pristine, defective and Pt encapsulated MOF‐808 is quantified with water adsorption and CO2 adsorption calorimetry. The results reveal strong competitive effects between crystal morphology and missing linker defects which in turn affect the crystal morphology, porosity, stability, and reactivity. In spite of leading to a loss in porosity, the introduction of defects (missing linkers or Pt nanoparticles) is beneficial to the stability of the MOF‐808 towards water and could also be advantageously used to tune adsorption properties of this MOF family.

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Section: Resultsmentioning

confidence: 99%

Tuning the Properties of MOF‐808 via Defect Engineering and Metal Nanoparticle Encapsulation

Hardian

Dissegna

Ullrich

et al. 2021

Chemistry A European J

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“…50 Another approach is via hydrothermal reactions, which use high pressure and temperature in addition to water and the organic compound to obtain metallic NPs. 51,52 Different materials have been reported to work, such as platinum 53 or titanium oxide 54 NPs for the catalytic industry, and Te, a rare metalloid, is also considered a good candidate. 55,56 Te nanowires (TeNWs) have been synthesized by employing hydrothermal reactions mainly for semiconductor and catalytic applications; 57,58 however, their biomedical applications are largely unknown, as Te -even has similarities with oxygen, selenium, or sulfuris not a trace element, and it has not been considered for biochemical interests.…”

Section: Introductionmentioning

confidence: 99%

<p>Comparison of cytocompatibility and anticancer properties of traditional and green chemistry-synthesized tellurium nanowires</p>

Vernet-Crua¹,

David²,

Zhang³

et al. 2019

IJN

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Background: Traditional physicochemical approaches for the synthesis of compounds, drugs, and nanostructures developed as potential solutions for antimicrobial resistance or against cancer treatment are, for the most part, facile and straightforward. Nevertheless, these approaches have several limitations, such as the use of toxic chemicals and production of toxic by-products with limited biocompatibility. Therefore, new methods are needed to address these limitations, and green chemistry offers a suitable and novel answer, with the safe and environmentally friendly design, manufacturing, and use of minimally toxic chemicals. Green chemistry approaches are especially useful for the generation of metallic nanoparticles or nanometric structures that can effectively and efficiently address health care concerns. Objective: Here, tellurium (Te) nanowires were synthesized using a novel green chemistry approach, and their structures and cytocompatibility were evaluated. Method: An easy and straightforward hydrothermal method was employed, and the Te nanowires were characterized using transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, and optical microscopy for morphology, size, and chemistry. Cytotoxicity tests were performed with human dermal fibroblasts and human melanoma cells (to assess anticancer properties). The results showed that a treatment with Te nanowires at concentrations between 5 and 100 μg/mL improved the proliferation of healthy cells and decreased cancerous cell growth over a 5-day period. Most importantly, the green chemistry-synthesized Te nanowires outperformed those produced by traditional synthetic chemical methods. Conclusion: This study suggests that green chemistry approaches for producing Te nanostructures may not only reduce adverse environmental effects resulting from traditional synthetic chemistry methods, but also be more effective in numerous health care applications.

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“…The morphological studies displayed well-dispersed spherical nanoparticles with uniform size distribution and an average particle diameter of 2–7 nm ( Figure 7 a) [ 123 ]. Similarly, ultra-small Pt-NPs were produced using hydrothermal [ 124 ] and water-in-oil microemulsion [ 125 ] techniques that resulted in narrow size distribution and average diameters of 2.45 ( Figure 7 c) and 5 nm ( Figure 7 d), respectively. The studies revealed well-defined crystal lattice planes with clusters containing a mixture of irregular and spherical morphologies.…”

Section: Green Synthesis Of Transitional Metals and Their Oxidesmentioning

confidence: 99%

Green Synthesis of Transition-Metal Nanoparticles and Their Oxides: A Review

2021

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In recent years, many researchers have begun to shift their focus onto the synthesis of nanomaterials as this field possesses immense potential that may provide incredible technological advances in the near future. The downside of conventional synthesis techniques, such as co-precipitation, sol-gel and hydrothermal methods, is that they necessitate the use of toxic chemicals, produce harmful by-products and require a considerable amount of energy; therefore, more sustainable fabrication routes are sought-after. Biological molecules have been previously utilized as precursors for nanoparticle synthesis, thus eliminating the negative factors involved in traditional methods. In addition, transition-metal nanoparticles possess a wide scope of applications due to their multiple oxidation states and large surface areas, thereby allowing for a higher reactivity when compared to their bulk counterpart and rendering them an interesting research topic. However, this field is still relatively unknown and unpredictable as the biosynthesis of these nanostructures from fungi, bacteria and plants yield undesired diameters and morphologies, rendering them as redundant when compared to their chemically synthesized counterparts. Therefore, this review aims to obtain a better understanding on the plant-mediated synthesis process of the major transition-metal and transition-metal oxide nanoparticles, and how process parameters—concentration, temperature, contact time, pH level, and calcination temperature affect their unique properties such as particle size, morphologies, and crystallinity.

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Hydrothermal Synthesis of Ultrasmall Pt Nanoparticles as Highly Active Electrocatalysts for Methanol Oxidation

Cited by 46 publications

References 22 publications

Tuning the Properties of MOF‐808 via Defect Engineering and Metal Nanoparticle Encapsulation

Tuning the Properties of MOF‐808 via Defect Engineering and Metal Nanoparticle Encapsulation

<p>Comparison of cytocompatibility and anticancer properties of traditional and green chemistry-synthesized tellurium nanowires</p>

Green Synthesis of Transition-Metal Nanoparticles and Their Oxides: A Review

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