Synthesis and properties of selenium trihydride at high pressures

Zhang, Xiao; Xu, Wan; Yu, Wei; Jiang, Shuqing; Gorelli, Federico A.; Greenberg, Eran; Prakapenka, Vitali B.; Goncharov, Alexander F.

doi:10.1103/physrevb.97.064107

Cited by 16 publications

(38 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, a host-guest I4/mcm-(H 2 Se) 2 H 2 structure, which was analogous to the one observed in (H 2 S) 2 H 2 , formed above 4.2 GPa. Both of these hydrides of selenium decomposed above 24 GPa at 300 K. 392 In addition to H 2 Se, a recent study synthesized a Cccm-H 3 Se phase at 4.6 GPa and 300 K. At 170 K Cmcm-H 3 Se was found to persist up to 39.5 GPa. Raman measurements and visual observations suggested that metalization occurred above 23 GPa.…”

Section: Seleniummentioning

confidence: 99%

The Search for Superconductivity in High Pressure Hydrides

Zarifi

Terpstra

et al. 2019

Reference Module in Chemistry, Molecular Sciences and Chemical Engineering

View full text Add to dashboard Cite

The computational and experimental exploration of the phase diagrams of binary hydrides under high pressure has uncovered phases with novel stoichiometries and structures, some which are superconducting at quite high temperatures. Herein we review the plethora of studies that have been undertaken in the last decade on the main group and transition metal hydrides, as well as a few of the rare earth hydrides at pressures attainable in diamond anvil cells. The aggregate of data shows that the propensity for superconductivity is dependent upon the species used to "dope" hydrogen, with some of the highest values obtained for elements that belong to the alkaline and rare earth, or the pnictogen and chalcogen families.

show abstract

Section: Seleniummentioning

confidence: 99%

The Search for Superconductivity in High Pressure Hydrides

Zarifi

Terpstra

et al. 2019

Reference Module in Chemistry, Molecular Sciences and Chemical Engineering

View full text Add to dashboard Cite

show abstract

“…Two peaks at 257 (A 1g(MoSe) ) and 287 cm −1 (E 2g(MoSe) ) are observed. [ 31 ] In addition, a new peak at 2365 cm −1 with increased peak intensity appears as the voltage varied from 0.05 to −0.15 V. Similar to the SH vibration band in the case of MoS 2 , this Raman peak is consistent with SeH stretching vibrations, [ 32,33 ] indicating that the H atoms are adsorbed to the active Se atoms to form intermediate MoSe 2 ‐H species here. The deduction is also verified by DFT simulation about the hydrogen adsorption of MoSe 2 (Figure S5, Supporting Information).…”

Section: Resultsmentioning

confidence: 69%

Monitoring Hydrogen Evolution Reaction Intermediates of Transition Metal Dichalcogenides via Operando Raman Spectroscopy

Guo

Li²,

Tang

et al. 2020

Adv Funct Materials

View full text Add to dashboard Cite

A deeper understanding of the water‐splitting hydrogen evolution reaction (HER) mechanism during photocatalytic processes is crucial for the rational design of efficient photocatalysts. In particular, the HER mechanism promoted by multielement hybrid structures remains extremely challenging and elusive. Herein, an in situ photoelectrochemical/Raman measurement system is employed to monitor the HER mechanism of hybrid nanostructures under realistic working conditions via operando Raman spectra and linear‐sweep voltammetry curves. As a proof of concept, tunable composition transition metal dichalcogenides MoS2xSe2(1−x) nanosheets are used as a model photocatalyst to unveil the corresponding photocatalytic mechanism. The spectroscopic studies reveal that hydrogen atoms can be adsorbed to active sulfur and selenium atoms via intermediate species formed during the photocatalytic process. More importantly, the studies demonstrate that an exponential relationship exists between the number of reactive electrons and the Raman intensity of intermediate species, which can serve as a guideline to directly evaluate the HER performance in photocatalysts by comparing the Raman intensities of the intermediate species. As a simple, intuitive, and general analytical method, the designed operando Raman measurement approach provides a new tool for elucidating catalytic reaction mechanisms in a realistic and complex environment; and strategically improving H2 production performance of multielement photocatalysts.

show abstract

Section: Main Textmentioning

confidence: 83%

“…According to Pace et al 1 , Zhang et al 2 claim that they synthesized a new compound H 3 Se which is different from the theoretically predicted one 3 that was also synthesized under similar conditions by Pace et al 4 . The material synthesized by Zhang et al 2 is clearly the same as theoretically predicted 3 and subsequently synthesized by Pace et al 4 ; this can be seen based on the presented x-ray diffraction (XRD) and Raman data. While we admit that Zhang et al 2 use the nomenclature H 3 Se for the molecular (H 2 Se) 2 H 2 at low pressure 4 , we stress that this was made on purpose to emphasize the connection to the expected high-pressure behavior that is analogous with the behavior of H 3 S 5-8 .…”

Section: Main Textmentioning

confidence: 83%

“…However, they admit themselves that XRD of these structures are very similar as the predicted peak positions and intensities are mainly determined by the positions of heavy Se, and these positions are almost indistinguishable in these two structures. The XRD data presented by Zhang et al 2 have been collected using very small samples (a few single crystals, each of which was a few micrometers in linear dimensions) that were synthesized by laser heating in a diamond anvil cell (DAC) at nearly 5 GPa. Unfortunately, a complete structural analysis was not possible in our DAC with a limited angular opening.…”

Section: Main Textmentioning

confidence: 99%

See 1 more Smart Citation

Reply to “Comment on ‘Synthesis and properties of selenium trihydride at high pressures’ ”

Zhang

et al. 2018

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

The Comment of Pace et al. [Phys. Rev. B in press] claims that structural analysis and nomenclature of Zhang et al. [Phys. Rev. B 97, 064107 (2018)] is incorrect, that this compound is not metallic at high pressures and 200 K, and that the compound instead decomposes. In this Reply we argue that there are no experimental data that can discriminate between theoretically predicted Cccm H 3 Se and advocated by Pace et al. I4/mcm (H 2 Se) 2 H 2. The difference in nomenclature is due to different naming conventions. We find the name "H 3 Se" more convenient to apply in the limit of high-pressure. We also substantiate the initial claims of the stability up to 40 GPa at 170 K of the H 3 Se compound after synthesis at 4.6 GPa and argue that the pressure induced metallization above 23 GPa is a plausible explanation of the reported visual observations and Raman spectroscopy results.

show abstract

Synthesis and properties of selenium trihydride at high pressures

Abstract: The chemical reaction products of molecular hydrogen (H 2 ) with selenium (Se) are studied by synchrotron x-ray diffraction (XRD) and Raman spectroscopy at high pressures. We find that a common H 2 Se is synthesized at 0.3 GPa using laser heating.

Cited by 16 publications

References 44 publications

The Search for Superconductivity in High Pressure Hydrides

The Search for Superconductivity in High Pressure Hydrides

Monitoring Hydrogen Evolution Reaction Intermediates of Transition Metal Dichalcogenides via Operando Raman Spectroscopy

Reply to “Comment on ‘Synthesis and properties of selenium trihydride at high pressures’ ”

Contact Info

Product

Resources

About