The Relationships among Hydrogen Adsorption, CO Stripping, and Selectivity of CO2 Reduction on Pd Nanoparticles

The formation of palladium hydrides is a well-known phenomenon, observed for both bulk and nanosized samples. The kinetics of hydrogen adsorption/desorption strongly depends on the particle size and shape, as well as the type of support and/or coating of the particles. In addition, the structural properties of hydride phases and their distribution also depend on the particle size. In this work, we report on the in situ characterization of palladium nanocubes coated with HKUST-1 metal-organic framework (Pd@HKUST-1) during desorption of hydrogen by means of synchrotron-based time-resolved X-ray powder diffraction. A slower hydrogen desorption, compared to smaller sized Pd nanoparticles was observed. Rietveld refinement of the time-resolved data revealed the remarkable stability of the lattice parameters of α- and β-hydride phases of palladium during the α- to β- phase transition, denoting the behavior more similar to the bulk materials than nanoparticles. The stability in the crystal sizes for both α- and β-hydride phases during the phase transition indicates that no sub-domains are formed within a single particle during the phase transition.

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THE NET ADSORPTION OF HYDROGEN ON PALLADIUM NANOPARTICLES

Surface Review and Letters ◽

10.1142/s0218625x1450022x ◽

2014 ◽

Vol 21 (02) ◽

pp. 1450022 ◽

Cited By ~ 1

Author(s):

DEBJYOTI SAHU ◽

PRASHANT MISHRA ◽

NITUN DAS ◽

ANIL VERMA ◽

SASIDHAR GUMMA

Keyword(s):

Ethylene Glycol ◽

Hydrogen Storage ◽

Palladium Nanoparticles ◽

Pressure Range ◽

Storage Capacity ◽

Hydrogen Adsorption ◽

Pd Nanoparticles ◽

Hydrogen Storage Capacity ◽

Pd Nanoparticle ◽

Gravimetric Adsorption

In this paper, we report the synthesis of polymer coated palladium ( Pd ) nanoparticles through a single stage reduction of Pd 2+ ions by ethylene glycol. Polyvinyl pyrrolidone (PVP, MW 25,000) is used as a stabilizer. Self-assembled Pd nanoparticles (10–40 nm) were used in hydrogen adsorption studies. Gravimetric adsorption measurements were carried out in a pressure range of 0–26 bar at 293, 324, 364 and 392 K. Saturation for all isotherms was obtained within a few bars of pressure at all temperatures. Maximum hydrogen storage capacity observed was 0.58 wt.% at 324 K and 20 bar. Net adsorption calculations indicated that required tank volume (for storing a particular amount of hydrogen) can be significantly reduced by using a tank filled with Pd nanoparticle.

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Electrochemical promotion of catalysis over Pd nanoparticles for CO2 reduction

Chemical Science ◽

10.1039/c6sc04966d ◽

2017 ◽

Vol 8 (4) ◽

pp. 2569-2573 ◽

Cited By ~ 38

Author(s):

Fan Cai ◽

Dunfeng Gao ◽

Hu Zhou ◽

Guoxiong Wang ◽

Ting He ◽

...

Keyword(s):

Ambient Temperature ◽

Co2 Reduction ◽

Pd Nanoparticles ◽

Electrochemical Promotion ◽

Enhancement Ratio ◽

Rate Enhancement ◽

Significant Rate ◽

Electrochemical Promotion Of Catalysis

Electrochemical promotion of catalysis was observed over Pd nanoparticles with a significant rate enhancement ratio (ρ) for catalyzing CO2 reduction to produce formate in 1 M KHCO3 solution at ambient temperature.

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Natural diatomite modified as novel hydrogen storage material

Functional Materials Letters ◽

10.1142/s1793604714500271 ◽

2014 ◽

Vol 07 (03) ◽

pp. 1450027 ◽

Cited By ~ 8

Author(s):

Jiao Jin ◽

Chenghui Zheng ◽

Huaming Yang

Keyword(s):

Hydrogen Storage ◽

Room Temperature ◽

Hydrogen Adsorption ◽

Pd Nanoparticles ◽

Hydrogen Storage Material ◽

Storage Material ◽

Interesting Application ◽

Thermally Activated ◽

Adsorption Capacities ◽

Pore Properties

Natural diatomite, subjected to different modifications, is investigated for hydrogen adsorption capacities at room temperature. An effective metal-modified strategy is developed to disperse platinum ( Pt ) and palladium ( Pd ) nanoparticles on the surface of diatomite. Hydrogen adsorption capacity of pristine diatomite (diatomite) is 0.463 wt.% at 2.63 MPa and 298 K, among the highest of the known sorbents, while that of acid-thermally activated diatomite (A-diatomite) could reach up to 0.833 wt.% due to the appropriate pore properties by activation. By incorporation with a small amount of Pt and Pd (~0.5 wt.%), hydrogen adsorption capacities are enhanced to 0.696 wt.% and 0.980 wt.%, respectively, indicating that activated diatomite shows interesting application in the field of hydrogen storage at room temperature.

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Correction: Electrochemical promotion of catalysis over Pd nanoparticles for CO2 reduction

Chemical Science ◽

10.1039/c7sc90011b ◽

2017 ◽

Vol 8 (4) ◽

pp. 3277-3277

Author(s):

Fan Cai ◽

Dunfeng Gao ◽

Hu Zhou ◽

Guoxiong Wang ◽

Ting He ◽

...

Keyword(s):

Co2 Reduction ◽

Pd Nanoparticles ◽

Electrochemical Promotion ◽

Electrochemical Promotion Of Catalysis

Correction for ‘Electrochemical promotion of catalysis over Pd nanoparticles for CO2 reduction’ by Fan Cai et al., Chem. Sci., 2017, DOI: 10.1039/c6sc04966d.

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