Modeling of hydrogen atom diffusion and response behavior of hydrogen sensors in Pd–Y alloy nanofilm

Liu, Yi; Li, Yanli; Huang, Pengcheng; Song, Han; Zhang, Gang

doi:10.1038/srep37043

Cited by 22 publications

(12 citation statements)

References 17 publications

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“…1d ). 37 However, almost identical TGA profiles were found at hydrogen concentrations of 16% and 20%, due to reaching the equilibrium condition. Furthermore, hydrogen spillover occurring at high pressure (30 bar) was also investigated at temperatures between 160–240 °C.…”

Section: Resultsmentioning

confidence: 90%

Hydrogen spillover through Matryoshka-type (ZIFs@)n−1ZIFs nanocubes

2018

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Hydrogen spillover phenomenon is well-documented in hydrogenation catalysis but still highly disputed in hydrogen storage. Until now, the existence of hydrogen spillover through metal–organic frameworks (MOFs) remains a topic of ongoing debate and how far the split hydrogen atoms diffuse in such materials is unknown. Herein we provide experimental evidence of the occurrence of hydrogen spillover in microporous MOFs at elevated temperatures, and the penetration depths of atomic hydrogen were measured quantitatively. We have made Matryoshka-type (ZIFs@)n−1ZIFs (where ZIFs = ZIF-8 or ZIF-67) nanocubes, together with Pt nanoparticles loaded on their external surfaces to produce atomic hydrogen. Within the (ZIFs@)n−1ZIFs, the ZIF-8 shell served as a ruler to measure the travelling distance of H atoms while the ZIF-67 core as a terminator of H atoms. In addition to the hydrogenolysis at normal pressure, CO2 hydrogenation can also trace the migration of H atoms over the ZIF-8 at high pressure.

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Section: Resultsmentioning

confidence: 90%

Hydrogen spillover through Matryoshka-type (ZIFs@)n−1ZIFs nanocubes

2018

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“…[17] The peak at higher binding energy (BE) (red dashed line in Figure 3d), is attributed to Sn 4+ coordinated by oxygen from PSS − . [22,23] This is clear evidence for the interaction between SnO x -NPs and PSS.…”

Section: Resultsmentioning

confidence: 92%

Boosting the Thermoelectric Properties of PEDOT:PSS via Low‐Impact Deposition of Tin Oxide Nanoparticles

Dong

Gerlach

Koutsogiannis

et al. 2021

Adv Elect Materials

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materials' efficiency to convert heat into electricity remains still quite low in the low-temperature range. To quantify the TE performances, the figure of merit zT is introduced, which is described by the equation = σ κ zT S T 2 , [4,5] where σ is the electrical conductivity, S the Seebeck coefficient, κ the thermal conductivity, and T the absolute temperature. Due to the intrinsically low thermal conductivity of polymeric TE materials, the power factor, which is described as PF = σS 2 , is the main factor to be improved. [6,7] However, σ and S influence each other and usually in an opposite way, meaning that when one of them increases, the other one will decrease. A large amount of research has been done to probe the relationship between these two variables and to try to improve them. [8][9][10] Poly(3,4-ethylenedioxy thiophene): poly(styrenesulfonate) (PEDOT:PSS, structure shown in Figure 1a) is one of the most studied among polymeric TE materials, being highly stable, easily processable, and showing the best TE properties for this family of materials so far. [11,12] Although various strategies including polar solvents treatment, acids/bases treatment, ionic liquids treatment, inorganic nanomaterials incorporation, etc. have been applied to improve the TE performance of PEDOT:PSS, [7] and PF as high as 380 µW m −1 K −2 can be achieved with the incorporation of 2D SnSe nanosheets, [13] effective and cost-effective methods simple enough that can be used for mass production are still lacking.Here we propose a new method to add "naked" nanoparticles (NPs) to PEDOT:PSS in order to improve its TE properties. The improvement in TE properties is achieved by a reorganization of the film structure induced by the NP addition via a specific interaction with the PSSchains. Key in this work is the use of "naked" NPs. Indeed, Zhang et al. proved the negative effect of the surface layer on inorganic Bi 2 Te 3 when embedded in PEDOT:PSS. [14] To incorporate "naked" inorganic NPs we selected a physical pathway for NP generation, namely spark discharge generation, which is one of the least expensive and most environmentally friendly methods to produce large amounts of NPs. [15,16] A flow of gas (Ar) can be used to carry the generated NPs towards the polymer target (see Figure 1b). Instead of applying the so-called impaction mode, where the NPs impinge vertically on the substrate, an alternative low Poly(3,4-ethylenedioxy thiophene):poly(styrenesulfonate) (PEDOT:PSS) exhibits valuable characteristics concerning stability, green-processing, flexibility, high electrical conductivity, and ease of property modulation, qualifying it as one of the most promising p-type organic conductors for thermoelectric (TE) applications. While blending with inorganic counterparts is considered a good strategy to further improve polymeric TE properties, only a few attempts succeed so far due to inhomogeneous embedding and the non-ideal organicinorganic contact. Here a new strategy to include nanoparticles (NPs) without any ligand termination inside ...

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“…However, in most cases involving the optical fibers these components are mainly used as passive wave guides for the signal response transport, while the H 2 presence is revealed by an additional and external transducer, such as a thin film [34]. So, all the above mentioned sensors lead to a discrete and localized H 2 concentration Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.…”

Section: Introductionmentioning

confidence: 99%

Distributed and discrete hydrogen monitoring through optical fiber sensors based on optical frequency domain reflectometry

Rizzolo¹,

Boukenter²,

Ouerdane³

et al. 2020

J. Phys. Photonics

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The potential of discrete and distributed fiber-based sensors exploiting the Rayleigh scattering signature of doped amorphous silica is investigated for the real time monitoring of molecular hydrogen (H 2 ) detection. We showed that the impact of the refractive index changes induced by the H 2 diffusion into the silica host matrix can be used to detect and quantify this gas presence through two approaches: first via the related fiber length variation and second through the observed spectral shift. Comparing the obtained results with H 2 diffusion calculations, we can estimate the sensor sensitivity thresholds to be ∼10 16 n molecule cm −3 for the distributed measurements (spatial resolution better than 1 mm) and below ∼10 19 n molecule cm −3 for the discrete-one. The presented architecture of the sensor is well adapted to the monitoring of slowly evolving H 2 concentrations such as the ones expected in nuclear waste repositories as the time response of the sensor remains limited by the diffusion of the gas within the optical fiber. These threshold values and time responses can be easily improved by optimizing the length, the composition and/or the geometry of the sensing fiber.

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Modeling of hydrogen atom diffusion and response behavior of hydrogen sensors in Pd–Y alloy nanofilm

Cited by 22 publications

References 17 publications

Hydrogen spillover through Matryoshka-type (ZIFs@)n−1ZIFs nanocubes

Hydrogen spillover through Matryoshka-type (ZIFs@)n−1ZIFs nanocubes

Boosting the Thermoelectric Properties of PEDOT:PSS via Low‐Impact Deposition of Tin Oxide Nanoparticles

Distributed and discrete hydrogen monitoring through optical fiber sensors based on optical frequency domain reflectometry

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