Green preparation of PtRu and PtCu/SBA-15 catalysts using supercritical CO 2

Sánchez-Miguel, E.; Tenorio, Maria; Morère, Jacobo; Cabañas, Albertina

doi:10.1016/j.jcou.2017.10.018

Cited by 16 publications

(10 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is concluded that the Pt(II)(acac) 2 can be converted to its metal form at 250 °C. These findings are consistent with the results obtained from various supported Pt nanoparticles fabricated using SCD [2,21,22]. Moreover, the intensity of the Pt (1 1 1) peak was substantially greater than the others, revealing that the Pt crystal growth was predominately in the (1 1 1) direction.…”

Section: Resultssupporting

confidence: 91%

“…The SCD process involved three main steps: (1) dissolution of a metallic precursor in scCO 2 under a given condition; (2) molecular adsorption of the precursor on the support; and, (3) decomposition of the precursor to its metal form. In general, a metallic precursor can be converted to its metal form using different methods, including: (1) chemical reduction in scCO 2 with a reducing agent (hydrogen); (2) thermal reduction in scCO 2 ; (3) thermal reduction in an inert atmosphere; or, (4) chemical reduction with hydrogen at ambient pressure [1,2,3]. In this study, the precursor was reduced thermally in scCO 2 , as shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

“…In this study, a full 2 4 factorial design (four factors, each with two levels) with a total of 16 experiments was used to investigate the main effect of four factors (deposition temperature and time, as well as reduction temperature and time) and the interaction effects between them. The high (+1) and low (−1) levels of the factors were selected based on previous experiments and the scientific literature [2,3,13]. The experiments were consistent with theories of factorial design, whereby all levels of each factor are combined with those of every other factor.…”

Section: Methodsmentioning

confidence: 99%

“…Supported noble-metal nanoparticles have recently been attracting attention in the field of microelectronics, optics, and catalytic applications due to their high activity and stability [1,2,3]. Pt nanoparticles are the most effective catalyst known for oxygen reduction, which is widely used for fuel cells [4,5].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Green Fabrication of Supported Platinum Nanoparticles by Supercritical CO2 Deposition

et al. 2018

View full text Add to dashboard Cite

Pt nanoparticles were successfully deposited on uncatalyzed carbon paper by the supercritical CO2 deposition (SCD) method using platinum (II) acetylacetonate as a precursor followed by thermal conversion. A full 24 factorial design (four factors, each with two levels) was used to investigate the main effect of four factors (deposition temperature, deposition time, reduction temperature, and reduction time) and the interaction effects between them. The morphological structures and surface properties of the Pt/carbon paper composite were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM)/energy-dispersive X-ray spectroscopy analyzer (EDS), and high-resolution transmission electron microscopy (HR-TEM). The results of the 24 factorial design showed that Pt loading on the substrate correlated significantly with deposition time, while Pt aggregation slightly increased with the thermal reduction temperature. Data obtained from both XRD and HR-TEM were in good agreement and showed that Pt nanoparticles were homogeneously dispersed on the substrate with diameters of 7.2–8.7 nm.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Green Fabrication of Supported Platinum Nanoparticles by Supercritical CO2 Deposition

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In contrast, supercritical fluids have emerged as sustainable media in the preparation and processing of materials [28,29]. Their tuneable density, lower viscosity and much higher diffusivity in comparison to liquids allow the preparation of advanced materials in a more sustainable way [30][31][32]. In particular supercritical CO2 is considered a sustainable solvent because it is non-toxic, inert, cheap and abundant (residue of the chemical industry), it can be recycled and it has low critical pressure and temperature (304.2 K, 7.38 MPa) [33].…”

Section: Introductionmentioning

confidence: 99%

One-step sustainable preparation of superparamagnetic iron oxide nanoparticles supported on mesoporous SiO2

Chamorro

Tenorio

Calvo

et al. 2020

The Journal of Supercritical Fluids

View full text Add to dashboard Cite

Superparamagnetic iron oxide nanoparticles (SPIONs) supported on high surface area mesoporous SiO2 are advanced materials of great interest in catalysis, adsorption and biomedicine. Here we present a new process to prepare SPION/SiO2 materials by the impregnation and insitu decomposition of Fe(NO3)3.9H2O on mesoporous SiO2 supports in a 25-50% mol ethanol + CO2 mixture at 523 K and 25.0 MPa. -Fe2O3 nanoparticles (NPs) of average size between 6-9 nm were distributed homogeneously on the supports. NPs deposited into the SBA-15 mesopores but mostly on the external surface of MCM-41. Materials prepared with the highest ethanol content were very homogeneous. Magnetic measurements confirmed the superparamagnetic nature of the materials at room temperature. The process proposed is sustainable and scalable, avoids tedious preparations and the additional high temperature treatment under a controlled atmosphere, as the metal decomposition is performed insitu in the CO2-expanded liquid mixture.

show abstract

Highly Active Carbon Supported PtCu Electrocatalysts for PEMFCs by in situ Supercritical Deposition Coupled with Electrochemical Dealloying

et al. 2019

View full text Add to dashboard Cite

Carbon aerogel and Vulcan supported PtCu electrocatalysts were prepared using the simultaneous and sequential in situ supercritical deposition (SCD) method in supercritical CO2 followed by thermal annealing and electrochemical dealloying. Before dealloying, annealed electrocatalysts prepared by simultaneous SCD had a more uniform PtCu composition in PtCu nanoparticles whereas electrocatalysts prepared by sequential SCD led to PtCu nanoparticles with Cu enrichment on the surface. Upon dealloying, PtCu/CA electrocatalyst prepared by simultaneous SCD had an enhanced ESA of 159.4 m2 g−1 due to the synergistic effects of PtCu nanoparticle size and PtCu composition in nanoparticles. All dealloyed electrocatalysts had higher mass activities and PtCu/Vulcan electrocatalyst prepared by simultaneous SCD had the highest mass activity of 0.178 A mgPt−1 which was more than twice of the mass activity of commercial Pt/C. PtCu/Vulcan electrocatalyst prepared by sequential SCD showed a specific activity of 0.511 mA cm−2 which was 5 times higher than the specific activity of commercial Pt/C.

show abstract

Green preparation of PtRu and PtCu/SBA-15 catalysts using supercritical CO 2

Cited by 16 publications

References 41 publications

Green Fabrication of Supported Platinum Nanoparticles by Supercritical CO2 Deposition

Green Fabrication of Supported Platinum Nanoparticles by Supercritical CO2 Deposition

One-step sustainable preparation of superparamagnetic iron oxide nanoparticles supported on mesoporous SiO2

Highly Active Carbon Supported PtCu Electrocatalysts for PEMFCs by in situ Supercritical Deposition Coupled with Electrochemical Dealloying

Contact Info

Product

Resources

About