Activated carbons doped with Pd nanoparticles for hydrogen storage

Zhao, Wenxia; Fierro, Vanessa; Zlotea, Claudia; Izquierdo, M.T.; Chevalier-César, Clotaire; Latroche, M.; Celzard, Alain

doi:10.1016/j.ijhydene.2011.12.058

Cited by 78 publications

(62 citation statements)

References 36 publications

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“…At room temperature and low pressure, Pd-anchored activated carbon has higher capacity than all other materials. This confirms the formation of palladium hydride at room temperature and low pressure, as demonstrated previously [28,29,32]. However, at high pressure, the favorable effect of palladium hydride formation is counteracted by the weight of the dopant, the filling of adsorbent micropores and pore blocking.…”

Section: Hydrogen Storage Measurementssupporting

confidence: 89%

“…Using Equation (1) and substituting for the observed surface area As = 931 m 2 /g, we obtain a theoretical hydrogen uptake of 2.1 wt% in close agreement with the reported value of 2.3 wt%. Moreover, these capacities are consistent with the reported data for wide range of carbon-based materials with wide textural properties [26][27][28][29]. The density of the adsorbed hydrogen at 77 K can be calculated from the hydrogen uptake (2.3 wt%) and the volume occupied by hydrogen in the micropore volume (0.36 cm 3 /g).…”

Section: Hydrogen Storage Measurementssupporting

confidence: 89%

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Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

et al. 2015

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Activated carbon has been synthesized from local palm shell, cardboard and plastics municipal waste in the Kingdom of Saudi Arabia. It exhibits a surface area of 930 m 2 /g and total pore volume of 0.42 cm 3 /g. This pristine activated carbon has been further anchored with nickel, palladium and platinum metal particles by ultrasound-assisted impregnation. Deposition of nanosized Pt particles as small as 3 nm has been achieved, while for Ni and Pd their size reaches 100 nm. The solid-gas hydrogenation properties of the pristine and metal-anchored activated carbon have been determined. The pristine material exhibits a reversible hydrogen storage capacity of 2.3 wt% at 77 K and 3 MPa which is higher than for the doped ones. In these materials, the spillover effect due to metal doping is of minor importance in enhancing the hydrogen uptake compared with the counter-effect of the additional mass of the metal particles and pore blocking on the carbon surface. OPEN ACCESS

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Section: Hydrogen Storage Measurementssupporting

confidence: 89%

Section: Hydrogen Storage Measurementssupporting

confidence: 89%

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

et al. 2015

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“…For both synthetic method many experimental parameters are plying a crucial role to ensure the stability toward coalescence and the high dispersion of such nanoparticles on the support: the porosity/surface chemistry of the support, the nature of metal precursor, the metal loading, and the synthesis conditions: temperature, reducing agent, etc. (de Jongh et al, 2007;Konarova et al, 2012;Zhao et al, 2012;Zlotea and Latroche, 2013).…”

Section: Synthesismentioning

confidence: 99%

“…at different temperatures depending on the reducing agent (Narehood et al, 2009;Zlotea et al, 2010bZlotea et al, , 2015bEssinger-Hileman et al, 2011). For pure Pd and Rh nanoparticles, the use of high temperature, typically above 300°C, as well as high metal loadings usually induces the growth of nanoparticles size and the increase of the particle size distribution (Zhao et al, 2012;Bastide et al, 2013;Zlotea et al, 2015b). Therefore, to prepare ultrasmall noble metal-based nanoparticles, low temperatures for the reduction step, moderate metal loadings, and highly porous supports are preferred.…”

Section: Synthesismentioning

confidence: 99%

Experimental Challenges in Studying Hydrogen Absorption in Ultrasmall Metal Nanoparticles

et al. 2016

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Recent advances on synthesis, characterization, and hydrogen absorption properties of ultrasmall metal nanoparticles (defined here as objects with average size ≤3 nm) are briefly reviewed in the first part of this work. The experimental challenges encountered in performing accurate measurements of hydrogen absorption in Mg-and noble metal-based ultrasmall nanoparticles are addressed. The second part of this work reports original results obtained for ultrasmall bulk-immiscible Pd-Rh nanoparticles. Carbonsupported Pd-Rh nanoalloys in the whole binary chemical composition range have been successfully prepared by liquid impregnation method followed by reduction at 300°C. EXAFS investigations suggested that the local structure of these nanoalloys is partially segregated into Rh-rich core and Pd-rich surface coexisting within the same nanoparticles. Downsizing to ultrasmall dimensions completely suppresses the hydride formation in Pd-rich nanoalloys at ambient conditions, contrary to bulk and larger nanosized (5-6 nm) counterparts. The ultrasmall Pd90Rh10 nanoalloy can absorb hydrogen-forming solid solutions under these conditions, as suggested by in situ X-ray diffraction (XRD). Apart from this composition, common laboratory techniques, such as in situ XRD, DSC, and PCI, failed to clarify the hydrogen interaction mechanism: either adsorption on developed surfaces or both adsorption and absorption with formation of solid solutions. Concluding insights were brought by in situ EXAFS experiments at synchrotron: ultrasmall Pd75Rh25 and Pd50Rh50 nanoalloys absorb hydrogen-forming solid solutions at ambient conditions. Moreover, the hydrogen solubility in these solid solutions is higher with increasing Pd content, and this trend can be understood in terms of hydrogen preferential occupation in the Pd-rich regions, as suggested by in situ EXAFS. The Rh-rich nanoalloys (Pd25Rh75 and Pd10Rh90) only adsorb hydrogen on the developed surface of ultrasmall nanoparticles. In summary, in situ characterization techniques carried out at large-scale facilities are unique and powerful tools for in-depth investigation of hydrogen interaction with ultrasmall nanoparticles at local level.

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“…One of the greatest problems connected with hydrogen is the method of its storage. The US Department of Energy (DOE) set new goals in 2009 for automotive applications of hydrogen: reversibility, a gravimetric density of approximately 6 wt.%, and consideration of the entire storage system (Zhao et al 2012a). Currently, the traditional methods of storage include either compressing or liquefying hydrogen, which are limited by being highly energy demanding, inefficient, and relatively unsafe (Xiao et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Bamboo-Based Activated Carbons with Super-High Specific Surface Area for Hydrogen Storage

et al. 2017

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Activated carbons (ACs) were developed from the agricultural by-products of moso bamboo by pyrolysis carbonization and the KOH activation process. N2 adsorption-desorption at 77 K, thermogravimetric analysis (TG), X-ray photoelectron spectrometry (XPS), element analysis (EA), Xray diffraction (XRD), scanning electron microscopy (SEM), highresolution transmission electron microscopy (HRTEM), and Fourier transform infrared spectroscopy (FTIR) were used to investigate the synthesis process, the impact of the weight ratio of KOH/bamboo charcoal (BC), and the characteristics of the bamboo charcoal and ACs produced. The results showed that the developed bamboo ACs achieved surface areas (SBET) as high as 3208 m 2 /g and micropores volumes (VDR) as high as 1.01 cm 3 /g. The carbonation and activation of the bamboo resulted in the enhancement of the microstructure of the bamboo ACs, and hence improvements in the sorption behavior and storage capacity. The highest hydrogen storage capacities achieved were 6.6 wt.% at 4 MPa and 2.74 wt.% at 1 bar, both at 77 K, which were much higher than those of a wellknown commercial activated carbon.

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Activated carbons doped with Pd nanoparticles for hydrogen storage

Cited by 78 publications

References 36 publications

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

Experimental Challenges in Studying Hydrogen Absorption in Ultrasmall Metal Nanoparticles

Synthesis of Bamboo-Based Activated Carbons with Super-High Specific Surface Area for Hydrogen Storage

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