One‐Step Surfactant‐Free Hydrothermal Synthesis of Platelike Sodium Niobate Template Powders

Gu, Qilin; Zhu, Kongjun; Liu, Jinsong; Wang, Jing; Liu, Pengcheng; Sun, Qiaomei; Qiu, Jinhao

doi:10.1111/jace.13237

Cited by 12 publications

(5 citation statements)

References 22 publications

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“…Although NN with orthorhombic, rhombohedral, , and monoclinic structures have been selectively synthesized in hydrothermal condition, the direct synthesis of cubic NN NWs via solvothermal route is unprecedented. Therefore, it is believed that the organic solvent EG may play an important role in forming the cubic NN NWs.…”

Section: Resultsmentioning

confidence: 99%

Modified Solvothermal Strategy for Straightforward Synthesis of Cubic NaNbO₃ Nanowires with Enhanced Photocatalytic H₂ Evolution

Gu¹,

Zhu²,

Zhang

et al. 2015

J. Phys. Chem. C

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To further improve the photocatalytic H2 evolution activity, NaNbO3 photocatalyts simultaneously possessing cubic crystal structure and 1D morphology have been successfully synthesized via a modified solvothermal strategy. During the process of synthesis employing ethylene glycol as solvent, a temperature fluctuation during the autoclaving period is proposed to regulate the grain growth without any other additives or calcinations. It is demonstrated that the structure-directing effect of the solvent is enhanced in the condition of the temperature fluctuation, contributing to the formation of 1D nanostructure. Otherwise, the irregular NaNbO3 nanoparticles with severe aggregation resulted. Photocatalytic H2 evolution activities of samples under ultraviolet light irradiation with 0.5 wt % of Pt cocatalyst indicate that NaNbO3 nanowires expectedly exhibit an enhanced activity of 699 μmol h–1 g–1, approaching twice that of NaNbO3 nanoparticles. The higher photocatalytic activity of NaNbO3 nanowires is attributed to their large specific surface area, high chemical purity, and powerful reduction ability, which have been confirmed by the further characterizations and analysis based on crystal structure, valence state, elemental composition, and energy band structure. The modified solvothermal strategy provides an alternative pathway to regulate the crystal growth, which can effectively integrate the unique morphology with desired crystalline structure toward increasing photocatalytic activity.

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Section: Resultsmentioning

confidence: 99%

Modified Solvothermal Strategy for Straightforward Synthesis of Cubic NaNbO₃ Nanowires with Enhanced Photocatalytic H₂ Evolution

Gu¹,

Zhu²,

Zhang

et al. 2015

J. Phys. Chem. C

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“…These results are in good accordance with the perfectly oriented aggregation (oriented attachment) between the nanocrystals, with assistance of the FTO substrate. Notably, all the elements are homogeneously distributed over the whole area of the nanosheets and nanoparticles, as shown in Figures S2 and S4 and Table S1. , …”

Section: Resultsmentioning

confidence: 91%

“…34 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 13 Pt. This is because the more CZTS nanoparticles are well-dispersed on the top surface of the substrate.…”

Section: Resultsmentioning

confidence: 99%

“…Notably, all the elements are homogeneously distributed over the whole area of the nanosheets and nanoparticles, as shown in Figures S2 and S4 and Table S1. 34,35 The current density−voltage (J−V) curves of DSSCs assembled with the same batch of photoanodes and CZTS, Pt CEs were recorded. The detailed photovoltaic parameters were summarized in Table 2, and every CE sample was measured with three cells.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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In-Situ and Green Method To Prepare Pt-Free Cu₂ZnSnS₄ (CZTS) Counter Electrodes for Efficient and Low Cost Dye-Sensitized Solar Cells

Chen,

Xu,

Tao

et al. 2015

ACS Sustainable Chem. Eng.

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A novel in-situ and green method with the combination of TiCl 4 pre-treatment and solvothermal growth was proposed to prepare the Pt-free Cu 2 ZnSnS 4 (CZTS) counter electrodes (CEs) on FTO substrate. It was found that TiCl 4 pre-treatment towards the substrates was crucial to high quality and high efficiency CZTS film, which was consists of nanosheets and nanoparticles structure. The highly crystallized nanosheets were assembled from kesterite-structure CZTS nanocrystals, with an average diameter of 10-30 nm. The detailed morphology, crystal structure, and composition of the CZTS nanostructures were characterized by SEM, TEM, SAED, XRD, Raman, and EDS analysis respectively. Electrocatalytic abilities of the films toward I -/I 3 were verified through cyclic voltammograms (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements. A maximum power conversion efficiency of 5.65 % was achieved for a cell with CZTS 3, under 100 mW/cm 2 , which was higher than that of a cell with a commercial Pt counter electrode (4.96%). This high efficiency was mainly attributed to the good bonding strength between CZTS films and FTO substrate (R S =4.41 Ω cm 2 ), and higher electron transfer process at the electrolyte/CE interface (high J SC ), along with superior electrochemical catalytic ability (R Ct =2.40 Ω cm 2 ). The in-situ prepared CZTS CEs are proved to be suitable for high efficiency Pt-free dye-sensitized solar cells (DSSCs), leading to significantly decrease of the cell cost and simplification of preparation process.

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“…These high temperature processes may cause the severe volatilization of lead ions and deteriorate the properties. In terms of wet-chemical route, such as hydrothermal synthesis [6,7], sol-gel [8] and the polymeric precursor method [9], lower temperature is needed for the crystallization processes, and fine powders with high activity can be obtained. Particularly, no subsequent calcination is required for hydrothermal synthesis, and the target would directly crystalline in liquid environment below 250°C [10].…”

Section: Introductionmentioning

confidence: 99%

Improved sintering activity and piezoelectric properties of PZT ceramics from hydrothermally synthesized powders with Pb excess

Kan

Zhu

et al. 2016

J Mater Sci: Mater Electron

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In this work, Pb(Zr, Ti)O 3 (PZT) powders were prepared by traditional hydrothermal method and solid state reaction. Subsequently, PZT ceramics were sintered and their electric properties (including piezoelectric coefficient d 33 , electromechanical coupling coefficient k p and mechanical quality factor Q m ) as a function of sintering temperature (1125-1250°C) were comparably studied. Given that the Pb deficiency may exist in the hydrothermally synthesized PZT powders, effects of Pb excess (0, 20 and 80 mol%) in the hydrothermal precursor on their sinterability were also involved. The hydrothermally synthesized PZT powders with 80 mol% Pb excess showed the highest sintering activity, and their electric properties peaked at 1175°C (d 33 = 225 pC/N, k p = 0.446, Q m = 300). It's demonstrated that A-site deficiency may degrade the sintering activity of PZT powders, and hydrothermal synthesis of PZT powders with appropriate Pb excess was the compromising pathway to increase their sinterability, decrease the sintering temperature and lessen the volatilization of Pb ion in the fabrication of widely applied PZT ceramic.

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One‐Step Surfactant‐Free Hydrothermal Synthesis of Platelike Sodium Niobate Template Powders

Cited by 12 publications

References 22 publications

Modified Solvothermal Strategy for Straightforward Synthesis of Cubic NaNbO₃ Nanowires with Enhanced Photocatalytic H₂ Evolution

Modified Solvothermal Strategy for Straightforward Synthesis of Cubic NaNbO₃ Nanowires with Enhanced Photocatalytic H₂ Evolution

In-Situ and Green Method To Prepare Pt-Free Cu₂ZnSnS₄ (CZTS) Counter Electrodes for Efficient and Low Cost Dye-Sensitized Solar Cells

Improved sintering activity and piezoelectric properties of PZT ceramics from hydrothermally synthesized powders with Pb excess

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One‐Step Surfactant‐Free Hydrothermal Synthesis of Platelike Sodium Niobate Template Powders

Cited by 12 publications

References 22 publications

Modified Solvothermal Strategy for Straightforward Synthesis of Cubic NaNbO3 Nanowires with Enhanced Photocatalytic H2 Evolution

Modified Solvothermal Strategy for Straightforward Synthesis of Cubic NaNbO3 Nanowires with Enhanced Photocatalytic H2 Evolution

In-Situ and Green Method To Prepare Pt-Free Cu2ZnSnS4 (CZTS) Counter Electrodes for Efficient and Low Cost Dye-Sensitized Solar Cells

Improved sintering activity and piezoelectric properties of PZT ceramics from hydrothermally synthesized powders with Pb excess

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Resources

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Modified Solvothermal Strategy for Straightforward Synthesis of Cubic NaNbO₃ Nanowires with Enhanced Photocatalytic H₂ Evolution

Modified Solvothermal Strategy for Straightforward Synthesis of Cubic NaNbO₃ Nanowires with Enhanced Photocatalytic H₂ Evolution

In-Situ and Green Method To Prepare Pt-Free Cu₂ZnSnS₄ (CZTS) Counter Electrodes for Efficient and Low Cost Dye-Sensitized Solar Cells