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Advances in Pd Nanoparticle Size Decoration of Mesoporous Carbon Spheres for Energy Application.

Zielinska B, Michalkiewicz B, Mijowska E, Kalenczuk RJ - Nanoscale Res Lett (2015)

Bottom Line: Pd nanoparticles with different sizes and diameter distributions were successfully deposited on the surface of disordered mesoporous carbon spheres (DMHCS).The results showed that Pd-supported carbon samples synthesized in the presence of Pd(OAc)2 exhibited enhanced hydrogen storage capacity in respect to the pristine DMHCS.It was found that the Pd nanoparticle content, size, and diameter distribution have a noticeable influence on H2 storage capacity.

View Article: PubMed Central - PubMed

Affiliation: Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, Szczecin, Pułaskiego 10, 70-322, Szczecin, Poland. bzielinska@zut.edu.pl.

ABSTRACT
Pd nanoparticles with different sizes and diameter distributions were successfully deposited on the surface of disordered mesoporous carbon spheres (DMHCS). The size and diameter distribution of the Pd particles were controlled by the application of different experimental conditions. Two methods of synthesis (reflux and impregnation) and two Pd precursors (palladium (II) acetyloacetonate (Pd(acac) 2) and palladium (II) acetate (Pd(OAc)2)) were investigated and compared for the preparation of Pd-decorated DMHCS. The hydrogen storage properties of the pristine DMHCS and Pd-modified DMHCS at 40 °C and a pressure range of 0-45 bar were studied. The results showed that Pd-supported carbon samples synthesized in the presence of Pd(OAc)2 exhibited enhanced hydrogen storage capacity in respect to the pristine DMHCS. The maximum hydrogen storage of 0.38 wt.% exhibited the sample with the Pd nanoparticle diameter distribution of 2-14 nm and the average Pd crystallite size of 7.6 nm. It was found that the Pd nanoparticle content, size, and diameter distribution have a noticeable influence on H2 storage capacity.

No MeSH data available.


Related in: MedlinePlus

TGA profiles of DMHCS, Pd-I1, Pd-R1, Pd-I2, and Pd-R2
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Fig4: TGA profiles of DMHCS, Pd-I1, Pd-R1, Pd-I2, and Pd-R2

Mentions: Figure 4 shows the TGA profiles of (a) DMHCS, (b) Pd-I1, (c) Pd-R1, (d) Pd-I2, and (e) Pd-R2. TGA results showed that burning of the pristine DMHCS begins at around 578 °C. Above this temperature, the weight loss rapidly increases until all of DMHCS are exhausted at about 700 °C. The residual weight of DMHCS after the combustion was 0 wt.%. It indicates the high purity of the synthesized DMHCS. Figure 4 indicates that the thermal stability of Pd-modified samples decreased in comparison to the pristine carbon spheres. For Pd-I1, Pd-R1, Pd-I2, and Pd-R2 samples, the burning of DMHCS begins at around 539, 527, 383, and 370 °C, respectively. This may be due to the interaction of Pd nanoparticles with carbon atoms inducing defects in the crystal structure of DMHCS [10]. Moreover, as shown in Fig. 4, Pd-R2 sample loses its weight in two stages. The first stage of weight loss at about 200 °C (~25 wt.%) is due to the decomposition of Pd(OAc)2 precursor [24]. The second weight loss (370–630 °C) is attributed to the burning of DMHCS. Moreover, according to the data from TG measurements, it was found that the content of palladium in Pd-I1, Pd-R1, Pd-I2, and Pd-R2 is 4.31, 8.62, 26.64, and 34.95 wt.%, respectively.Fig. 4


Advances in Pd Nanoparticle Size Decoration of Mesoporous Carbon Spheres for Energy Application.

Zielinska B, Michalkiewicz B, Mijowska E, Kalenczuk RJ - Nanoscale Res Lett (2015)

TGA profiles of DMHCS, Pd-I1, Pd-R1, Pd-I2, and Pd-R2
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4627970&req=5

Fig4: TGA profiles of DMHCS, Pd-I1, Pd-R1, Pd-I2, and Pd-R2
Mentions: Figure 4 shows the TGA profiles of (a) DMHCS, (b) Pd-I1, (c) Pd-R1, (d) Pd-I2, and (e) Pd-R2. TGA results showed that burning of the pristine DMHCS begins at around 578 °C. Above this temperature, the weight loss rapidly increases until all of DMHCS are exhausted at about 700 °C. The residual weight of DMHCS after the combustion was 0 wt.%. It indicates the high purity of the synthesized DMHCS. Figure 4 indicates that the thermal stability of Pd-modified samples decreased in comparison to the pristine carbon spheres. For Pd-I1, Pd-R1, Pd-I2, and Pd-R2 samples, the burning of DMHCS begins at around 539, 527, 383, and 370 °C, respectively. This may be due to the interaction of Pd nanoparticles with carbon atoms inducing defects in the crystal structure of DMHCS [10]. Moreover, as shown in Fig. 4, Pd-R2 sample loses its weight in two stages. The first stage of weight loss at about 200 °C (~25 wt.%) is due to the decomposition of Pd(OAc)2 precursor [24]. The second weight loss (370–630 °C) is attributed to the burning of DMHCS. Moreover, according to the data from TG measurements, it was found that the content of palladium in Pd-I1, Pd-R1, Pd-I2, and Pd-R2 is 4.31, 8.62, 26.64, and 34.95 wt.%, respectively.Fig. 4

Bottom Line: Pd nanoparticles with different sizes and diameter distributions were successfully deposited on the surface of disordered mesoporous carbon spheres (DMHCS).The results showed that Pd-supported carbon samples synthesized in the presence of Pd(OAc)2 exhibited enhanced hydrogen storage capacity in respect to the pristine DMHCS.It was found that the Pd nanoparticle content, size, and diameter distribution have a noticeable influence on H2 storage capacity.

View Article: PubMed Central - PubMed

Affiliation: Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, Szczecin, Pułaskiego 10, 70-322, Szczecin, Poland. bzielinska@zut.edu.pl.

ABSTRACT
Pd nanoparticles with different sizes and diameter distributions were successfully deposited on the surface of disordered mesoporous carbon spheres (DMHCS). The size and diameter distribution of the Pd particles were controlled by the application of different experimental conditions. Two methods of synthesis (reflux and impregnation) and two Pd precursors (palladium (II) acetyloacetonate (Pd(acac) 2) and palladium (II) acetate (Pd(OAc)2)) were investigated and compared for the preparation of Pd-decorated DMHCS. The hydrogen storage properties of the pristine DMHCS and Pd-modified DMHCS at 40 °C and a pressure range of 0-45 bar were studied. The results showed that Pd-supported carbon samples synthesized in the presence of Pd(OAc)2 exhibited enhanced hydrogen storage capacity in respect to the pristine DMHCS. The maximum hydrogen storage of 0.38 wt.% exhibited the sample with the Pd nanoparticle diameter distribution of 2-14 nm and the average Pd crystallite size of 7.6 nm. It was found that the Pd nanoparticle content, size, and diameter distribution have a noticeable influence on H2 storage capacity.

No MeSH data available.


Related in: MedlinePlus