ياسر تركي متروك الحربي

براءة إختراع

Patent: CATALYST AND METHOD RELATED THERETO

US PATENT

12/11/2020

Disclosed herein is a method: a) mixing a solution comprising a catalyst support and a solvent comprising water and a non-water polar solvent with an active metal composition and a precipitating agent, thereby producing a catalyst precursor.

      Also disclosed herein is a catalyst prepared by the method disclosed herein.

      Also disclosed herein is a composition comprising: a) a catalyst support; b) a solvent comprising water and a non-water polar solvent; c) an active metal composition; and d) a precipitating agent.

      Additional advantages will be set forth in part in the description which follows, and in part will be obvious from the description, or can be learned by practice of the aspects described below. The advantages described below will be realized and attained by means of the chemical compositions, methods, and combinations thereof particularly pointed out in the appended claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive.

https://patentscope.wipo.int/search/en/detail.jsf?docId=US310905797&tab=NATIONALBIBLIO

البحوث المنشورة

Molecular Precursor Route to Bournonite (CuPbSbS3) Thin Films and Powders

https://pubs.acs.org/doi/full/10.1021/acs.inorgchem.1c02001

12/08/2021

Quaternary metal chalcogenides have attracted attention as candidates for absorber materials for inexpensive and sustainable solar energy generation. One of these materials, bournonite (orthorhombic CuPbSbS3), has attracted much interest of late for its properties commensurate with photovoltaic energy conversion. This paper outlines the synthesis of bournonite for the first time by a discrete molecular precursor strategy. The metal dithiocarbamate complexes bis(diethyldithiocarbamato)copper (II) (Cu(S2CNEt2)2, (1)), bis(diethyldithiocarbamato)lead (II) (Pb(S2CNEt2)2, (2)), and bis(diethyldithiocarbamato)antimony (III) (Sb(S2CNEt2)3, (3)) were prepared, characterized, and employed as molecular precursors for the synthesis of bournonite powders and the thin film by solvent-less pyrolysis and spray-coat-pyrolysis techniques, respectively. The polycrystalline powders and thin films were characterized by powder X-ray diffraction (p-XRD), which could be indexed to orthorhombic CuPbSbS3. The morphology of the powder at the microscale was studied using scanning electron microscopy (SEM). Energy-dispersive X-ray spectroscopy (EDX) was used to elucidate an approximately 1:1:1:3 Cu/Pb/Sb/S elemental ratio. An optical band gap energy of 1.55 eV was estimated from a Tauc plot, which is close to the theoretical value of 1.41 eV.

Direct synthesis of nanostructured silver antimony sulfide powders from metal xanthate precursors

https://www.nature.com/articles/s41598-021-82446-3

04/02/2021

Silver(I) ethylxanthate [AgS2COEt] (1) and antimony(III) ethylxanthate [Sb(S2COEt)3] (2) have been synthesised, characterised and used as precursors for the preparation of AgSbS2 powders and thin films using a solvent-free melt method and spin coating technique, respectively. The as-synthesized AgSbS2 powders were characterized by powder X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. The crystalline AgSbS2 powder was investigated using XRD, which shows that AgSbS2 has cuboargyrite as the dominant phase, which was also confirmed by Raman spectroscopy. SEM was also used to study the morphology of the resulting material which is potentially nanostructured. EDX spectra gives a clear indication of the presence of silver (Ag), antimony (Sb) and sulfur (S) in material, suggesting that decomposition is clean and produces high quality AgSbS2 crystalline powder, which is consistent with the XRD and Raman data. Electronic properties of AgSbS2 thin films deposited by spin coating show a p-type conductivity with measured carrier mobility of 81 cm2 V−1 s−1 and carrier concentration of 1.9 × 1015 cm−3. The findings of this study reveal a new bottom-up route to these compounds, which have potential application as absorber layers in solar cells.

Scalable and Universal Route for the Deposition of Binary, Ternary, and Quaternary Metal Sulfide Materials from Molecular Precursors

https://pubs.acs.org/doi/abs/10.1021/acsaem.9b02359

22/01/2020

A range of binary, ternary (CFS), and quaternary (CZTS) metal sulfide materials have been successfully deposited onto the glass substrates by air-spray deposition of metal diethyldithiocarbamate molecular precursors followed by pyrolysis (18 examples). The as-deposited materials were characterized by powder X-ray diffraction (p-XRD), Raman spectroscopy, secondary electron microscopy (SEM), and energy-dispersive X-ray (EDX) spectroscopy, which in all cases showed that the materials were polycrystalline with the expected elemental stoichiometry. In the case of the higher sulfides, EDX spectroscopy mapping demonstrated the spatial homogeneity of the elemental distributions at the microscale. By using this simple and inexpensive method, we could potentially fabricate thin films of any given main group or transition metal chalcogenide material over large areas, theoretically on substrates with complex topologies.

المؤتمرات العلمية

Nanotech Middle East International Conference 2020

24 – 26/02/2020

2020 Dubai – UAE

Poster presentation

Synthesis of quaternary chalcogenide CPSS (CuPbSbS3) as a candidate absorber material for solar cells

The quaternary material CuPbSbS3 (bournonite) considering as a candidate of the important applications such thermoelectricity and solar cell because of its optical, electronic properties, and thermal conductivity. 1, 2 It has potential advantages over other materials, including its simple synthetic approaches to these new nanocrystalline phases in order to develop cost effective processing techniques to incorporate nanoscale features within a bulk material for potential thermoelectric and other energy-related applications. The band gaps of bournonite have been reported to be 1.23 eV and 1.31 eV. 3 In this work the precursors bis(diethyldithiocarbamato) Copper (II), bis(diethyldithiocarbamato) lead (II), and bis(diethyldithiocarbamato) antimony (III) were prepared, characterized and employed for synthesis of the quaternary material CuPbSbS3 by simple, efficient and low-cost techniques named melt reaction and of air-spray pyrolysis deposition.

https://www.setcor.org/userfiles/files/2020/NanotechME2020/Nanotech-ME-2020-Book-of-Abstracts.pdf

14th International Conference on Materials Chemistry (MC14)

08-11/07/2019

Birmingham, United Kingdom

Poster presentation

Direct synthesis of nanostructured silver antimony sulfide from single source precursors for solar cell application

Silver antimony sulfide cuboargyrite nanostructure are significantly important in several applications such as solar cells due to the distinct ferroelectric, thermoelectric and non linear optical properties they present 1 It has many potential advantages over other materials, including its low cost, high abundance, negligible toxicity and optical properties 2 Low temperature soft processing route to produce silver antimony sulfide of well defined phase using molecular precursor chemistry T he cuboargyrite phase of AgSbS 2 which is rarely found in nature but possesses excellent properties for solar cell applications.