Short-Lived Interfaces in Energy Materials

Borgschulte, Andreas; Terreni, Jasmin; Fumey, Benjamin; Sambalova, Olga; Billeter, Emanuel

doi:10.3389/fenrg.2021.784082

Cited by 4 publications

(3 citation statements)

References 120 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The second difficulty is that hydrogen can be detected and quantified by very few in situ methods only. [47][48][49] Terreni et al 32,50 demonstrated the use of neutron radiography for hydrogen detection in catalysts. Neutron imaging is element-specific for hydrogen and compatible under the harsh conditions in catalysis, but lacks chemical selectivity.…”

Section: Methodsmentioning

confidence: 99%

Combinatorial neutron imaging methods for hydrogenation catalysts

Nikolić

Longo

Billeter

et al. 2022

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Methodsmentioning

confidence: 99%

Combinatorial neutron imaging methods for hydrogenation catalysts

Nikolić

Longo

Billeter

et al. 2022

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The knowledge gap arises from the same uncertainties described above and owing to the fact that current experimental methods provide information only on either the time-resolved but spatially averaged concentration in a metal (hydride) during the sorption process, or vice versa. Available methods usually rely on sophisticated analytical setups [3,18] such as electron microscopy [19,20], elastic recoil distribution analysis [21], N15-nuclear resonance analysis [22e24] etc., which are difficult to convert into an operando method.…”

Section: Introductionmentioning

confidence: 99%

Sorption kinetics in metal hydrides by leaky coating

Kazaz

Billeter

Borgschulte

2022

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

“…[8] Hydrogen sorption kinetics may also be surface limited in a number of metal hydrides for hydrogen storage. [33,[51][52][53] Some additives with low dissociation barriers including Pd attached to the metal-hydride surface are known. [52] This study may provide a different way at interpreting the experimentally derived activation energies of such systems.…”

mentioning

confidence: 99%

Bulk Thermodynamics Determines Surface Hydrogen Concentration in Membranes

Billeter

Kazaz

Borgschulte

2022

Adv Materials Inter

Self Cite

View full text Add to dashboard Cite

nonconverted reactants. In this step, hydrogen may be separated from the mixture, and reused in the reaction. In a future scenario with hydrogen as a main energy carrier, the separation and/or purification of the energetically costly hydrogen will become even more important. [1][2][3] A promising way is the use of hydrogen selective membranes made of hydrogen absorbing metals, such as Pd and its alloys. [4,5] The permeability of such membranes is determined by the surface properties of both sides (dissociation/recombination) and by the bulk permeability (diffusion and solubility). [4] There has been substantial research effort in finding cheaper materials with a higher permeability than that of Pd (e.g., V, Nb, Ta, and their alloys [6][7][8][9][10] ), however, expensive Pd and Pd based alloys remain the superior membrane materials owing to their favorable surface properties. [5,11] Cheap materials such as V-based alloys will revolutionize the technology, if their surface properties can be modified to match those of Pd. Despite this rather straightforward goal, there is a knowledge gap of what these desirable surface properties are. Most works refer to concepts from surface science which describe the physisorption, dissociation (barrier), and chemisorption of hydrogen. [12] However, additional steps-the hopping to subsurface sites and adjacent bulk sites-are needed to model the permeation process adequately. Nevertheless, due to the complex interaction of steps, the predictive power of modeling is limited [4,6,13] and-more importantly-experimental verification only possible by comparison with very basic experiments (permeation kinetics, e.g. ref.[14]) due to the lack of operando hydrogen analysis.Baldi et al. have demonstrated electron energy loss spectroscopy as an analysis method for bulk hydrogen in nano-particles. [15] In this paper, we further developed the method to be able to probe the surface hydrogen content of hydride thin films in situ by reflecting electron energy loss spectroscopy (REELS). The method is applied in an experimental approach, in which the surface properties of membranes can be intentionally modified and their hydrogen content determined under operating conditions. We demonstrate the existence of a rate-limiting step by direct observation of the dependence of the permeation on the hydrogen content in a Pd/V composite membrane. The modeling yields the relevance of the individual layers, making it possible to link the results to the ones obtained from hydrogen uptakeThe functioning of hydrogen selective metal membranes relies on the finetuned interaction of their surfaces with the inner bulk. The link between hydrogen permeation and surface concentration is unveiled using a novel combination of thin film preparation and surface science analysis to probe and intentionally modify the surface properties of palladium vanadium composite membranes. The in situ preparation allows for observation of ultraclean hydrogenation and the quantification of the permeation as a function of temperature and p...

show abstract

Short-Lived Interfaces in Energy Materials

Cited by 4 publications

References 120 publications

Combinatorial neutron imaging methods for hydrogenation catalysts

Combinatorial neutron imaging methods for hydrogenation catalysts

Sorption kinetics in metal hydrides by leaky coating

Bulk Thermodynamics Determines Surface Hydrogen Concentration in Membranes

Contact Info

Product

Resources

About