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Talyzin, Alexandr V
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Publications (10 of 73) Show all publications
Tumanov, N. A., Roedern, E., Lodziana, Z., Nielsen, D. B., Jensen, T. R., Talyzin, A. V., . . . Filinchuk, Y. (2016). High-Pressure Study of Mn(BH4)(2) Reveals a Stable Polymorph with High Hydrogen Density. Chemistry of Materials, 28(1), 274-283.
Open this publication in new window or tab >>High-Pressure Study of Mn(BH4)(2) Reveals a Stable Polymorph with High Hydrogen Density
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2016 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 28, no 1, 274-283 p.Article in journal (Refereed) Published
Abstract [en]

High-pressure behavior of alpha-Mn(BH4)(2) was studied up to 29.4 GPa in diamond anvil cells using powder Xray diffraction combined with DFT calculations and Raman spectroscopy, and two new polymorphs were discovered. The first polymorph, delta-Mn(BH4)(2), forms near 1 GPa and is isostructural to the magnesium analogue delta-Mg(BH4)(2). This polymorph is stable upon decompression to ambient conditions and can also be obtained by compression of alpha-Mn(BH4)(2) in a large-volume steel press as well as by high-energy ball milling. It shows a high volumetric density of hydrogen of 125 g H-2/L at ambient conditions. delta-Mn(BH4)(2) was refined in the space group I4(1)/acd with the cell parameters a = 7.85245(6), c = 12.1456(2) angstrom, and V = 748.91(1) angstrom(3) at ambient conditions; it can also be described in a stable P-4n2 superstructure. Its thermal stability was studied by in situ X-ray powder diffraction and thermal analysis coupled with mass-spectroscopy. delta-Mn(BH4)(2) transforms back to alpha-Mn(BH4)(2) upon heating in the temperature range of 67-109 degrees C in Ar (1 bar) or H-2 (100 bar) atmosphere, and a decomposition is initiated at 130 degrees C with the release of hydrogen and some diborane. Mn(BH4)(2) undergoes a second phase transition to delta'-Mn(BH4)(2) in the pressure range of 8.6-11.8 GPa. delta'-phase is not isostructural to the second high-pressure phase of Mg(BH4)(2), and its structure was determined in the root 2a X c supercell compared to the delta-phase and refined in the space group Fddd with a = 9.205(17), b = 9.321(10), c = 12.638(15) angstrom, and V = 1084(3) angstrom(3) at 11.8 GPa. Equations of state were determined for alpha- and delta-Mn(BH4)(2).

National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-116078 (URN)10.1021/acs.chemmater.5b04102 (DOI)000368322600035 ()
Available from: 2016-02-10 Created: 2016-02-08 Last updated: 2017-11-30Bibliographically approved
Korobov, M. V., Talyzin, A. V., Rebrikova, A. T., Shilayeva, E. A., Avramenko, N. V., Gagarin, A. N. & Ferapontov, N. B. (2016). Sorption of polar organic solvents and water by graphite oxide: thermodynamic approach. Carbon, 102, 297-303.
Open this publication in new window or tab >>Sorption of polar organic solvents and water by graphite oxide: thermodynamic approach
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2016 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 102, 297-303 p.Article in journal (Refereed) Published
Abstract [en]

Sorption of polar organic solvents CH3OH, C4H8O (THF), CH3CN, C3H7NO (DMF), C2H6OS (DMSO), C5H9NO (NMP) and water was quantitatively evaluated for Hummers (H-GO) and Brodie (B-GO) graphite oxides at T = 298K and at melting temperature (Tm) of the solvents. H-GO showed stronger sorption compared to B-GO for all studied solvents and the increase of sorption upon lowering temperature was observed for both H-GO and B-GO. Thermodynamic equations allowed to explain earlier reported "maximums" of swelling/sorption in the binary systems H-GO – solvent at Tm. The specific relation between the values of enthalpies of sorption and melting leads to the change of sign in enthalpies of sorption at Tm and causes maximal swelling/sorption. The same thermodynamic explanation was given for the "maximum" on the swelling vs. pressure dependence in B-GO and H-GO – H2O systems earlier reported at pressure of phase transition "liquid water-ice VI". Notably higher sorption of H2O was observed for H-GO compared to H-GO membrane (H-GOm) at high relative humidity (RH), RH > 0.75. Experimental sorption isotherm of H-GOm was used to simulate permeation rates of water through H-GOm and to estimate effective diffusion coefficient of water through the membrane.

Place, publisher, year, edition, pages
Elsevier, 2016
National Category
Physical Chemistry
Identifiers
urn:nbn:se:umu:diva-119625 (URN)10.1016/j.carbon.2016.02.070 (DOI)000372808200033 ()
Available from: 2016-05-20 Created: 2016-04-25 Last updated: 2017-11-30Bibliographically approved
Gorkina, A. L., Tsapenko, A. P., Gilshteyn, E. P., Koltsova, T. S., Larionova, T. V., Talyzin, A., . . . Nasibulin, A. G. (2016). Transparent and conductive hybrid graphene/carbon nanotube films. Carbon, 100, 501-507.
Open this publication in new window or tab >>Transparent and conductive hybrid graphene/carbon nanotube films
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2016 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 100, 501-507 p.Article in journal (Refereed) Published
Abstract [en]

Carbon nanomaterials (carbon nanotubes (CNTs) and graphene) are promising materials for optoelectronic applications, including flexible transparent and conductive films (TCFs) due to their extraordinary electrical, optical and mechanical properties. However, the performance of CNT- or graphene-only TCFs still needs to be improved. One way to enhance the optoelectrical properties of TCFs is to hybridize CNTs and graphene. This approach leads to creation of a novel material that exhibits better properties than its individual constituents. In this work, the novel hybrid CNT-graphene nanomaterial was fabricated by graphene oxide deposition on top of CNT films. The graphene oxide was then reduced by thermal annealing at ambient atmosphere or in H2 atmosphere. At the final step the CNT-graphene hybrids were chemically doped using gold(III) chloride. As a result, we show that the hybrids demonstrate excellent optoelectrical performance with the sheet resistance as low as 73 Ω/□ at 90% transmittance.

Place, publisher, year, edition, pages
Elsevier, 2016
National Category
Materials Chemistry Physical Chemistry
Identifiers
urn:nbn:se:umu:diva-118238 (URN)10.1016/j.carbon.2016.01.035 (DOI)000369961400058 ()
Available from: 2016-03-18 Created: 2016-03-14 Last updated: 2017-11-30Bibliographically approved
Talyzin, A., Klechikov, A., Korobov, M., Rebrikova, A. T., Avramenko, N. V., Gholami, M. F., . . . Rabe, J. P. (2015). Delamination of graphite oxide in a liquid upon cooling.. Nanoscale, 7(29), 12625-30.
Open this publication in new window or tab >>Delamination of graphite oxide in a liquid upon cooling.
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2015 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 7, no 29, 12625-30 p.Article in journal (Refereed) Published
Abstract [en]

Graphite oxide (GO) in liquid acetonitrile undergoes a transition from an ordered phase around ambient temperature to a gel-like disordered phase at temperatures below 260 K, as demonstrated by in situ X-ray diffraction. The stacking order of GO layers is restored below the freezing point of acetonitrile (199 K). The reversible swelling transition between a stacked crystalline phase and an amorphous delaminated state observed upon cooling provides an unusual example of increased structural disorder at lower temperatures. The formation of the gel-like phase is attributed to the thermo-responsive conformational change of individual GO flakes induced by stronger solvation. Scanning force microscopy demonstrates that GO flakes deposited onto a solid substrate from acetonitrile dispersions at a temperature below 260 K exhibit corrugations and wrinkling which are not observed for the flakes deposited at ambient temperature. The thermo-responsive transition between the delaminated and stacked phases reported here can be used for sonication-free dispersion of graphene oxide, micro-container applications, or the preparation of new composite materials.

National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-107187 (URN)10.1039/c5nr02564h (DOI)000358207700046 ()26147576 (PubMedID)
Available from: 2015-08-19 Created: 2015-08-19 Last updated: 2017-12-04Bibliographically approved
Quesnel, E., Roux, F., Emieux, F., Faucherand, P., Kymakis, E., Volonakis, G., . . . Pellegrini, V. (2015). Graphene-based technologies for energy applications, challenges and perspectives. 2D Materials, 2(3), 1-16.
Open this publication in new window or tab >>Graphene-based technologies for energy applications, challenges and perspectives
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2015 (English)In: 2D Materials, ISSN 2053-1583, Vol. 2, no 3, 1-16 p.Article in journal (Refereed) Published
Abstract [en]

Here we report on technology developments implemented into the Graphene Flagship European project for the integration of graphene and graphene-related materials (GRMs) into energy application devices. Many of the technologies investigated so far aim at producing composite materials associating graphene or GRMs with either metal or semiconducting nanocrystals or other carbon nanostructures (e.g., CNT, graphite). These composites can be used favourably as hydrogen storage materials or solar cell absorbers. They can also provide better performing electrodes for fuel cells, batteries, or supercapacitors. For photovoltaic (PV) electrodes, where thin layers and interface engineering are required, surface technologies are preferred. We are using conventional vacuum processes to integrate graphene as well as radically new approaches based on laser irradiation strategies. For each application, the potential of implemented technologies is then presented on the basis of selected experimental and modelling results. It is shown in particular how some of these technologies can maximize the benefit taken from GRM integration. The technical challenges still to be addressed are highlighted and perspectives derived from the running works emphasized.

Keyword
graphene, energy application, hydrogen storage, battery, supercapacitor, photovoltaics, fuel cell
National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-113412 (URN)
Available from: 2015-12-17 Created: 2015-12-17 Last updated: 2015-12-17Bibliographically approved
Talyzin, A. V., Anoshkin, I. V. & Nasibulin, A. G. (2015). High-temperature transformations of coronene-based graphene nanoribbons encapsulated in SWNTs. Physica status solidi. B, Basic research, 252(11), 2491-2495.
Open this publication in new window or tab >>High-temperature transformations of coronene-based graphene nanoribbons encapsulated in SWNTs
2015 (English)In: Physica status solidi. B, Basic research, ISSN 0370-1972, E-ISSN 1521-3951, Vol. 252, no 11, 2491-2495 p.Article in journal (Refereed) Published
Abstract [en]

Coronene-based graphene nanoribbons encapsulated inside single-walled carbon nanotubes (SWNTs) were prepared 440 degrees C under Ar and annealed at temperatures up to 825 degrees C. The structural modifications of coronene/SWNT samples were studied using Raman spectroscopy and transmission electron microscopy. Coronene and coronene-based graphene nanoribbons are hydrogen terminated and annealing at temperatures above the stability limit of C-H bonds were expected to result in formation of new products. Indeed, Raman spectroscopy revealed the appearance of new sharp peaks after annealing of samples above 650 degrees C. The possible nature of encapsulated products produced by annealing of hydrogen terminated nanoribbons inside SWNTs is discussed. 

Keyword
carbon nanotubes, coronene, graphene, encapsulation, nanoribbons
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:umu:diva-113865 (URN)10.1002/pssb.201552212 (DOI)000364690400024 ()
Available from: 2016-03-13 Created: 2016-01-04 Last updated: 2017-11-30Bibliographically approved
Baburin, I. A., Klechikov, A., Mercier, G., Talyzin, A. & Seifert, G. (2015). Hydrogen adsorption by perforated graphene. International journal of hydrogen energy, 40(20), 6594-6599.
Open this publication in new window or tab >>Hydrogen adsorption by perforated graphene
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2015 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 40, no 20, 6594-6599 p.Article in journal (Refereed) Published
Abstract [en]

We performed a combined theoretical and experimental study of hydrogen adsorption in graphene systems with defect-induced additional porosity. It is demonstrated that perforation of graphene sheets results in increase of theoretically possible surface areas beyond the limits of ideal defect-free graphene (∼2700 m2/g) with the values approaching ∼5000 m2/g. This in turn implies promising hydrogen storage capacities up to 6.5 wt% at 77 K, estimated from classical Grand canonical Monte Carlo simulations. Hydrogen sorption was studied for the samples of defected graphene with surface area of ∼2900 m2/g prepared using exfoliation of graphite oxide followed by KOH activation. The BET surface area of studied samples thus exceeded the value of single-layered graphene. Hydrogen uptake measured at 77 K and 296 K amounts to 5.5 wt% (30 bar) and to 0.89 wt% (120 bar), respectively. 

Place, publisher, year, edition, pages
Elsevier, 2015
Keyword
Graphene-based nanostructures, Hydrogen storage, High surface area, Porous materials
National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-104374 (URN)10.1016/j.ijhydene.2015.03.139 (DOI)000354581100013 ()
Available from: 2015-07-06 Created: 2015-06-10 Last updated: 2017-12-04Bibliographically approved
Klechikov, A. G., Mercier, G., Merino, P., Blanco, S., Merino, C. & Talyzin, A. V. (2015). Hydrogen storage in bulk graphene-related materials. Microporous and Mesoporous Materials, 210, 46-51.
Open this publication in new window or tab >>Hydrogen storage in bulk graphene-related materials
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2015 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 210, 46-51 p.Article in journal (Refereed) Published
Abstract [en]

Hydrogen sorption properties of graphene-related materials were studied by gravimetric and volumetric methods at 2931< and 77K. Rapid thermal exfoliation of different types of graphite oxide (GO) precursors yielded samples with maximal surface areas up to 850 m(2)/g, whereas surface areas up to 2300 m(2)/g were achieved by post-exfoliation activation treatments. Therefore, hydrogen storage parameters of graphene materials could be evaluated in a broad range of surface areas. The H-2 uptake vs surface area trend revealed in this study shows that hydrogen storage by graphene materials do not exceed 1 Wt% at 120 Bar H-2 at ambient temperatures. Linear increase of hydrogen adsorption vs surface area was observed at 77 K with maximal observed value of similar to 5 Wt% for 2300 m(2)/g sample. It can be concluded that bulk graphene samples obtained using graphite oxide exfoliation and activation follow standard for other nanostructured carbons hydrogen uptake trends and do not demonstrate superior hydrogen storage parameters reported in several earlier studies. Nevertheless, graphene remains to be one of the best materials for physisorption of hydrogen, especially at low temperatures.

Keyword
Graphene, Graphene oxide, Hydrogen storage
National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-103716 (URN)10.1016/j.micromeso.2015.02.017 (DOI)000353733300007 ()
Available from: 2015-06-11 Created: 2015-05-28 Last updated: 2017-12-04Bibliographically approved
Klechikov, A., Mercier, G., Sharifi, T., Baburin, I. A., Seifert, G. & Talyzin, A. V. (2015). Hydrogen storage in high surface area graphene scaffolds. Chemical Communications, 51(83), 15280-15283.
Open this publication in new window or tab >>Hydrogen storage in high surface area graphene scaffolds
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2015 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 51, no 83, 15280-15283 p.Article in journal (Refereed) Published
Abstract [en]

Using an optimized KOH activation procedure we prepared highly porous graphene scaffold materials with SSA values up to 3400 m2 g−1 and a pore volume up to 2.2 cm3 g−1, which are among the highest for carbon materials. Hydrogen uptake of activated graphene samples was evaluated in a broad temperature interval (77–296 K). After additional activation by hydrogen annealing the maximal excess H2 uptake of 7.5 wt% was obtained at 77 K. A hydrogen storage value as high as 4 wt% was observed already at 193 K (120 bar H2), a temperature of solid CO2, which can be easily maintained using common industrial refrigeration methods.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2015
Keyword
graphene hydrogen storage adsorption
National Category
Condensed Matter Physics
Research subject
Physical Chemistry
Identifiers
urn:nbn:se:umu:diva-109475 (URN)10.1039/c5cc05474e (DOI)
Available from: 2015-09-28 Created: 2015-09-28 Last updated: 2017-12-01Bibliographically approved
Mercier, G., Klechikov, A., Hedenstrom, M., Johnels, D., Baburin, I. A., Seifert, G., . . . Talyzin, A. V. (2015). Porous Graphene Oxide/Diboronic Acid Materials: Structure and Hydrogen Sorption. The Journal of Physical Chemistry C, 119(49), 27179-27191.
Open this publication in new window or tab >>Porous Graphene Oxide/Diboronic Acid Materials: Structure and Hydrogen Sorption
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2015 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 119, no 49, 27179-27191 p.Article in journal (Refereed) Published
Abstract [en]

Solvothermal reaction of graphite oxide (GO) with benzene-1,4-diboronic acid (DBA) was reported previously to result in formation of graphene oxide framework (GOP) materials. The theoretical structure of GOFs consists of graphene layers separated by benzene-diboronic "pillars" with similar to 1 nm slit pores thus providing the opportunity to use it as a model material to verify the effect of a small pore size on hydrogen adsorption. A set of samples with specific surface area (SSA) in the range of similar to 50-1000 m(2)/g were prepared using variations of synthesis conditions and GO/DBA proportions. Hydrogen storage properties of GOF samples evaluated at 293 and 77 K were found to be similar to other nanocarbon trends in relation to SSA values. Structural characterization of GO/DBA samples showed all typical features reported as evidence for formation of a framework structure such as expanded interlayer distance, increased temperature of thermal exfoliation, typical features in FTIR spectra, etc. However, the samples also exhibited reversible swelling in polar solvents which is not compatible with the idealized GOF structure linked by benzenediboronic molecular pillars. Therefore, possible alternative nonframework models of structures with pillars parallel and perpendicular to GO planes are considered.

National Category
Chemical Sciences Physical Sciences
Identifiers
urn:nbn:se:umu:diva-113842 (URN)10.1021/acs.jpcc.5b06402 (DOI)000366339000001 ()
Available from: 2016-03-30 Created: 2016-01-04 Last updated: 2017-11-30Bibliographically approved
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