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Bulyk LI, Vasylechko L, Mykhaylyk V, Tang C, Zhydachevskyy Y, Hizhnyi YA, Nedilko SG, Klyui NI, Suchocki A. Mn 2+ luminescence of Gd(Zn,Mg)B 5O 10 pentaborate under high pressure. Dalton Trans 2020; 49:14268-14279. [PMID: 33029603 DOI: 10.1039/d0dt01851a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The results of X-ray diffraction studies of the Gd(Mg0.95-x,ZnxMn-0.05)B5O10 down-converting phosphor as a function of Mg-Zn composition are presented. The lattice parameters and unit cell volumes of GdMg0.95-xZnxMn0.05B5O10 pentaborates are examined. The relationships between the structure and optical properties of these materials are explicated based on the results of theoretical calculations of the energy structure. The effect of pressure on the luminescence of Mn2+ in this system was studied up to ca. 32 GPa. The observed quenching of Mn2+ luminescence is due to the crossing of the emitting 4T1g level with the non-emitting 2T2g state. This crossing sets a long-wavelength limit on the possibility of observing the emission of Mn2+ ions, which is around 850 nm.
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Affiliation(s)
- L-I Bulyk
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, Warsaw 02-668, Poland.
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Zhou L, Butenko DS, Ogorodnyk IV, Klyui NI, Zatovsky IV. Rietveld refinement of the langbeinite-type phosphate K 2Ni 0.5Hf 1.5(PO 4) 3. Acta Crystallogr E Crystallogr Commun 2020; 76:1634-1637. [PMID: 33117578 PMCID: PMC7534254 DOI: 10.1107/s2056989020012062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 09/01/2020] [Indexed: 11/30/2022]
Abstract
Polycrystalline potassium nickel(II) hafnium(IV) tris-(orthophosphate), a langbeinite-type phosphate, was synthesized by a solid-state method. The three-dimensional framework of the title compound is built up from two types of [MO6] octa-hedra [the M sites are occupied by Hf:Ni in ratios of 0.754 (8):0.246 (8) and 0.746 (8):0.254 (8), respectively] and [PO4] tetra-hedra are connected via O vertices. The K+ cations are located in two positions within large cavities of the framework, having coordination numbers of 9 and 12. The Hf, Ni and K sites lie on threefold rotation axes, while the P and O atoms are situated in general positions.
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Affiliation(s)
- Liang Zhou
- College of Physics, Jilin University 2699 Qianjin St., 130012 Changchun, People’s Republic of China
| | - Denys S. Butenko
- College of Physics, Jilin University 2699 Qianjin St., 130012 Changchun, People’s Republic of China
| | - Ivan V. Ogorodnyk
- ShimUkraine LLC, 18, Chigorina Str., office 429, 01042 Kyiv, Ukraine
| | - Nickolai I. Klyui
- V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 41 Pr. Nauki, 03028 Kyiv, Ukraine
| | - Igor V. Zatovsky
- College of Physics, Jilin University 2699 Qianjin St., 130012 Changchun, People’s Republic of China
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Butenko DS, Zhang X, Zatovsky IV, Fesych IV, Li S, Chen R, Chufarov M, Symonenko O, Klyui NI, Han W. Bi(nanoparticles)/CN x(nanosheets) nanocomposites as high capacity and stable electrode materials for supercapacitors: the role of urea. Dalton Trans 2020; 49:12197-12209. [PMID: 32930696 DOI: 10.1039/d0dt02073g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The evolution of high-performance and stable electrode materials for supercapacitors plays a vital role in the next generation of energy storage devices. In this work we present a simple method for preparing Bi(nanoparticles)/CNx(nanosheets) nanocomposites as electrode materials for supercapacitors, which were synthesized by thermally treating bismuth citrate and urea at 550-700 °C under an Ar atmosphere. According to physicochemical studies (XRD, SEM, TG-DTA, XPS, FTIR, and BET), a "smeared" bismuth formation or the formation of nanoparticles on the CNx surface of interwoven 2D-nanosheets at different calcination temperatures was observed. Electrochemical measurements show that the specific capacity of the composites can reach 1251 F g-1 (more than 90% of the theoretical value) at a current density of 500 mA g-1 in a 6 M KOH electrolyte, and most two-dimensional CNx-based nanostructures remain intact after multiple galvanostatic charge-discharge processes, which is promising for the development of highly efficient supercapacitors. A supercapacitor composed of Bi/CNx nanocomposites for the negative electrode and Ni-layered hydroxide for the positive electrode demonstrates a high energy density of 58 W h kg-1 with a power density of 800 W kg-1 accompanied by a good cycle life (the parameters decreased down to only 78% after 1000 charge-discharge cycles). Our current results indicate that the addition of urea not only determines the morphology of the composites, but also lays the foundation for the development of new types of nanocomposites for the power industry.
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Affiliation(s)
- Denys S Butenko
- Sino-Russian International Joint Laboratory for Clean Energy and Energy Conversion Technology, College of Physics, International Center of Future Science, Jilin University, Changchun 130012, China.
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Mu C, Butenko DS, Odynets IV, Zatovsky ІV, Li J, Han W, Klyui NI. Na 4Ni 3P 4O 15-Ni(OH) 2 core-shell nanoparticles as hybrid electrocatalysts for the oxygen evolution reaction in alkaline electrolytes. Dalton Trans 2020; 49:8226-8237. [PMID: 32501461 DOI: 10.1039/d0dt01205j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
There is wide interest in developing efficient, robust and low-cost electrode materials for the electrolysis of water to produce clean hydrogen fuel. It is especially important to improve the performance and durability of electrocatalysts for the OER. Here we have shown that the transformation of nanoparticle (n-NNP) and crystalline (c-NNP) forms of mixed phosphate Na4Ni3(PO4)2P2O7 in highly alkaline solutions occurs along various routes and provokes the generation of 2D Ni(OH)2 nanosheets or stable core(phosphate)-shell(Ni(OH)2) particles, respectively. In both cases, in the carbon matrix (through chemical and electrochemical conversion of phosphate in situ during electrolysis in a 6 M KOH or NaOH solution) stable OER electrocatalysts with low overpotentials of 250-290 mV at a current density of 10 mA cm-2 were obtained. The best candidate for the OER process is core-shell particles, which maintain overpotentials of around 250 mV in 6 M KOH for more than 3 days. The activity enhancement can be attributed to the formation of abundant NiOOH nanoparticles on the shell surface due to improved lattice matching. This report discusses future prospects for the creation of core-shell particles to reduce the overpotential of durable electrocatalysts for the OER.
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Affiliation(s)
- Chen Mu
- College of Physics, Jilin University, Changchun 130012, P. R. China.
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Li S, Bychkov KL, Butenko DS, Terebilenko KV, Zhu Y, Han W, Baumer VN, Slobodyanik MS, Ji H, Klyui NI. Scheelite-related MBi 1-xV 1-xMo xO 4 (M II- Ca, Sr) solid solution-based photoanodes for enhanced photoelectrochemical water oxidation. Dalton Trans 2020; 49:2345-2355. [PMID: 32022074 DOI: 10.1039/c9dt04417e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The photoelectrochemical properties of scheelite-related MBi1-xV1-xMoxO4 (MII = Ca, Sr, x = 0.1 to 0.9) solid solutions deposited on conductive glass (coated with SnO2, F-doped) have been investigated as photoanodes in photoelectrochemical (PEC) water splitting. The variation of the final annealing temperature during the preparation of the conduction electrodes as well as the value of substitution x have been shown to affect the PEC performance. The micropowders of MBi1-xV1-xMoxO4 (MII = Ca, Sr, x = 0.1 to 0.9) samples were first fabricated vi a solid-state method; they were characterised by SEM microscopy and powder and single crystal X-ray diffraction, and the band gap values were estimated using diffusive reflectance data. The value of substitution x = 0.1 in the cases of samples containing calcium and strontium affords the highest PEC performance reported for the whole range of substitution. These results demonstrate a promising approach for the beneficial utilization of BiVO4-substituted scheelite-related solid solutions in photo-electrochemical cells towards efficient and inexpensive photoanodes.
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Affiliation(s)
- Shilin Li
- Sino-Russian International Joint Laboratory for Clean Energy and Energy Conversion Technology, College of Physics, Jilin University, Changchun 130012, P. R. China
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Yang Y, Xi Y, Li J, Wei G, Klyui NI, Han W. Flexible Supercapacitors Based on Polyaniline Arrays Coated Graphene Aerogel Electrodes. Nanoscale Res Lett 2017; 12:394. [PMID: 28599513 PMCID: PMC5465002 DOI: 10.1186/s11671-017-2159-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 05/23/2017] [Indexed: 05/31/2023]
Abstract
Flexible supercapacitors(SCs) made by reduced graphene oxide (rGO)-based aerogel usually suffer from the low energy density, short cycle life and bad flexibility. In this study, a new, synthetic strategy was developed for enhancing the electrochemical performances of rGO aerogel-based supercapacitor via electrodeposition polyaniline arrays on the prepared ultralight rGO aerogel. The novel hybrid composites with coated polyaniline (PANI) arrays growing on the rGO surface can take full advantage of the rich open-pore and excellent conductivity of the crosslinking framework structure of 3D rGO aerogel and high capacitance contribution from the PANI. The obtained hybrid composites exhibit excellent electrochemical performance with a specific capacitance of 432 F g-1 at the current density of 1 A g-1, robust cycling stability to maintain 85% after 10,000 charge/discharge cycles and high energy density of 25 W h kg-1. Furthermore, the flexible all-solid-state supercapacitor have superior flexibility and outstanding stability under different bending states from the straight state to the 90° status. The high-performance flexible all-solid-state SCs together with the lighting tests demonstrate it possible for applications in portable electronics.
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Affiliation(s)
- Yu Yang
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University, Changchun, 130012, People's Republic of China
| | - Yunlong Xi
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University, Changchun, 130012, People's Republic of China
| | - Junzhi Li
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University, Changchun, 130012, People's Republic of China
| | - Guodong Wei
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University, Changchun, 130012, People's Republic of China
| | - N I Klyui
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University, Changchun, 130012, People's Republic of China
- Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Pr. Nauki 41, 03028, Kyiv, Ukraine
| | - Wei Han
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University, Changchun, 130012, People's Republic of China.
- International Center of Future Science, Jilin University, Changchun, 130012, China.
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Gryshkov O, Klyui NI, Temchenko VP, Kyselov VS, Chatterjee A, Belyaev AE, Lauterboeck L, Iarmolenko D, Glasmacher B. Porous biomorphic silicon carbide ceramics coated with hydroxyapatite as prospective materials for bone implants. Mater Sci Eng C Mater Biol Appl 2016; 68:143-152. [PMID: 27524006 DOI: 10.1016/j.msec.2016.05.113] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 04/18/2016] [Accepted: 05/24/2016] [Indexed: 02/03/2023]
Abstract
Porous and cytocompatible silicon carbide (SiC) ceramics derived from wood precursors and coated with bioactive hydroxyapatite (HA) and HA-zirconium dioxide (HA/ZrO2) composite are materials with promising application in engineering of bone implants due to their excellent mechanical and structural properties. Biomorphic SiC ceramics have been synthesized from wood (Hornbeam, Sapele, Tilia and Pear) using a forced impregnation method. The SiC ceramics have been coated with bioactive HA and HA/ZrO2 using effective gas detonation deposition approach (GDD). The surface morphology and cytotoxicity of SiC ceramics as well as phase composition and crystallinity of deposited coatings were analyzed. It has been shown that the porosity and pore size of SiC ceramics depend on initial wood source. The XRD and FTIR studies revealed the preservation of crystal structure and phase composition of in the HA coating, while addition of ZrO2 to the initial HA powder resulted in significant decomposition of the final HA/ZrO2 coating and formation of other calcium phosphate phases. In turn, NIH 3T3 cells cultured in medium exposed to coated and uncoated SiC ceramics showed high re-cultivation efficiency as well as metabolic activity. The recultivation efficiency of cells was the highest for HA-coated ceramics, whereas HA/ZrO2 coating improved the recultivation efficiency of cells as compared to uncoated SiC ceramics. The GDD method allowed generating homogeneous HA coatings with no change in calcium to phosphorus ratio. In summary, porous and cytocompatible bio-SiC ceramics with bioactive coatings show a great promise in construction of light, robust, inexpensive and patient-specific bone implants for clinical application.
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Affiliation(s)
- Oleksandr Gryshkov
- Institute for Multiphase Processes, Leibniz Universität Hannover, 30167 Hannover, Germany.
| | - Nickolai I Klyui
- College of Physics, Jilin University, 130012 Changchun, PR China; V. Lashkaryov Institute of Semiconductor Physics, National Academy of Science of Ukraine, 03028 Kyiv, Ukraine.
| | - Volodymyr P Temchenko
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Science of Ukraine, 03028 Kyiv, Ukraine.
| | - Vitalii S Kyselov
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Science of Ukraine, 03028 Kyiv, Ukraine.
| | - Anamika Chatterjee
- Institute for Multiphase Processes, Leibniz Universität Hannover, 30167 Hannover, Germany.
| | - Alexander E Belyaev
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Science of Ukraine, 03028 Kyiv, Ukraine.
| | - Lothar Lauterboeck
- Institute for Multiphase Processes, Leibniz Universität Hannover, 30167 Hannover, Germany.
| | - Dmytro Iarmolenko
- V. Lashkaryov Institute of Semiconductor Physics, National Academy of Science of Ukraine, 03028 Kyiv, Ukraine.
| | - Birgit Glasmacher
- Institute for Multiphase Processes, Leibniz Universität Hannover, 30167 Hannover, Germany.
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