Hydrothermal Synthesis of the Blue Potassium Molybdenum Bronze, K0.28MoO3

Chin, Kin; Eda, Kazuo; Sotani, Noriyuki; Whittingham, M. Stanley

doi:10.1006/jssc.2001.9450

Cited by 12 publications

(8 citation statements)

References 27 publications

(16 reference statements)

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“…[10][11][12][13][14][15] Recently, we have focused our work on hydrothermal synthesis of alkali metal molybdenum bronzes from solids (H x MoO 3 , which is a hydrogen insertion compound of layered MoO 3 ) with structural affinities to the target products. [16,17] In the present work, we could obtain single-phase potassium blue and red bronzes by the hydrothermal treatments of H x MoO 3 , and found that the conversion of H x MoO 3 (x > 0.3) during the hydrothermal reaction was quite different from that of H x MoO 3 (x < 0.3). According to our investigations of their conversion mechanisms, the difference was related to the presence of two types of conversion routes: one is a structure-inheriting solid-state route and the other is a solution dissolution/deposition one.…”

Section: Introductionmentioning

confidence: 56%

“…Blue bronze:As reported previously,[17] the conversion of H 0.28 MoO 3 to the blue bronze during the hydrothermal reaction can be described as H 0.28 MoO 3 → H x MoO 3 + hydrated-type bronze ((K•nH 2 O) y [H 0.28-y MoO 3 )) → blue bronze (K 0.28 MoO 3 ). The topotactic insertion of hydrated K + ions into the interlayer region of the H 0.28 MoO 3 by an ion-exchange reaction occurred, forming initially a hydrated-type bronze and then inducing a structural…”

mentioning

confidence: 71%

“…re-construction process leading to the formation of the potassium blue bronze. [17] According to the SEM investigations (Fig. 7), the crystallites of the blue bronze were formed by exfoliation from the surface of the crystallites of the starting solid (or the surface of crystallites of the hydrated-type bronze formed from H 0.28 MoO 3 by the topotactic insertion of hydrated K + ions).…”

Section: Formation Process Of Potassium Metal Molybdenum Bronzes Frommentioning

confidence: 99%

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Hydrothermal synthesis of potassium molybdenum oxide bronzes: structure-inheriting solid-state route to blue bronze and dissolution/deposition route to red bronze

Eda

Chin

Sotani

et al. 2005

Journal of Solid State Chemistry

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The hydrothermal syntheses of the alkali metal molybdenum bronzes from starting solids (H x MoO 3) with structural affinities to the desired products were investigated. Single-phase potassium blue and red bronzes were prepared by the hydrothermal treatments at around 430 K, and characterized by powder X-ray diffraction, IR spectroscopy, and SEM. The formation processes of these two bronzes during the hydrothermal treatments were found to differ. The blue bronze was formed by a structure-inheriting solid-state route from H x MoO 3 with x<0.3, whereas the red bronze was formed for x>0.3 through a solution dissolution/deposition route via the formation of MoO 3 + MoO 2 .

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Section: Introductionmentioning

confidence: 56%

mentioning

confidence: 71%

Section: Formation Process Of Potassium Metal Molybdenum Bronzes Frommentioning

confidence: 99%

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Hydrothermal synthesis of potassium molybdenum oxide bronzes: structure-inheriting solid-state route to blue bronze and dissolution/deposition route to red bronze

Eda

Chin

Sotani

et al. 2005

Journal of Solid State Chemistry

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“…HM(V)B e) 10 3 ∼10 5 [ 55 ] 10 −3 ∼10 −2 [ 55 ] electrochemical deposition, [ 55 ] Wet-chemical coating, [ 56 ] etc.…”

Section: Tinmentioning

confidence: 99%

Energy Storage Performance Enhancement by Surface Engineering of Electrode Materials

Jia

Mai

et al. 2016

Adv Materials Inter

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transportation, limiting the rate capability and power density of LIBs and SIBs. In addition, due to the larger size of Na + than Li + , the challenges of SIBs are more signifi cant, including poor cycling stability, low columbic effi ciency, and insuffi cient power capability. On these regards, surface engineering is an essential research issue. From 1990s, considerable efforts have been devoted to the nanosynthesis of electrode materials, boosting the fast development of new electrode materials for high-performance electrochemical energy storage (EES) devices. [4][5][6] An electrode with surface engineered nanostructure can render benefi ts to its electrochemical properties, including (i) abundant active sites and electrode/electrolyte contact area, (ii) enhanced electrical conductivity and charge collection effi ciency, (iii) shortened ion diffusion paths and higher ionic conductivity, (iv) better mechanical alleviation for insertion/de-insertion strain. [ 7 ] However, nanoscaling is a "double-edged sword"; It cannot fulfi ll all the rigorous requirements of LIBs and SIBs. Parasitic reactions may occur on the exposed surfaces of electrode materials, such as the solubility of intermediated products, the formation of unstable solid electrolyte interface (SEI) fi lms, and the decomposition of electrolyte. These will lead to deformation of electrode structure and subsequently the capacity decay upon long cycles. To tackle these issues, a rational design of nanostructures and surface engineering are in the ascendant. [ 8,9 ] In view of the growing number of surface engineering strategies that have employed successfully for electrodes of various types of energy storage devices (e.g., batteries, photoelectrochemical cells, and supercapacitors), in this report, we will highlight the recent progress specifi cally in LIBs and SIBs. We start with a general summary of nanostructured electrode confi gurations and surface coating methods, and then elaborate the basic effects of nanoscale size, pore, and morphology. Our main discussion will be put on the effects of surface engineering on suppressing secondary reaction and SEI fi lm, buffering for volume expansion, electrical and ionic conductivity enhancement for LIBs and SIBs. At the end, we will provide an overall conclusion and our own perspective. A General Summary of Surface Engineering StrategiesGenerally, the concept of surface engineering can be classifi ed into two main categories (see Figure 1 ): (i) intrinsic nanostructures with high surface areas and (ii) hybridization with Surface engineering of electrode materials to yield favorable electrochemical performance is a hot spot of current research in the energy storage area. Here, this Report highlights recent progress in rational surface engineering strategies in association with their effects on the electrochemical properties. The electrochemical performance enhancement due to both intrinsic nanostructuring and hybridization with surface functional species is elaborated. The focus here is lithium and sodium ion b...

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“…The lowering of synthetic temperature may allow an access to materials with novel structural features. With the aim of searching novel synthetic routes and materials, we have been investigating reactions under hydrothermal conditions [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Transition metal tetramolybdate dihydrates MMo4O13·2H2O (M=Co,Ni) having a novel pillared layer structure

Eda

Ohshiro

Nagai

et al. 2009

Journal of Solid State Chemistry

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a b s t r a c tHydrothermal synthesis in the M/Mo/O (M ¼ Co,Ni) system was investigated. Novel transition metal tetramolybdate dihydrates MMo 4 O 13 Á 2H 2 O (M ¼ Co,Ni), having an interesting pillared layer structure, were found. The molybdates crystallize in the triclinic system with space group PÀ1, Z ¼ 1 with unit cell (6)1 for NiMo 4 O 13 Á 2H 2 O The structure is composed of two-dimensional molybdenum-oxide (2D Mo-O) sheets pillared with CoO 6 octahedra. The 2D Mo-O sheet is made up of infinite straight ribbons built up by corner-sharing of four molybdenum octahedra (two MoO 6 and two MoO 5 OH 2 ) sharing edges. These infinite ribbons are similar to the straight ones in triclinic-K 2 Mo 4 O 13 having 1D chain structure, but are linked one after another by corner-sharing to form a 2D sheet structure, like the twisted ribbons in BaMo 4 O 13 Á 2H 2 O (or in orthorhombic-K 2 Mo 4 O 13 ) are.

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Hydrothermal Synthesis of the Blue Potassium Molybdenum Bronze, K0.28MoO3

Cited by 12 publications

References 27 publications

Hydrothermal synthesis of potassium molybdenum oxide bronzes: structure-inheriting solid-state route to blue bronze and dissolution/deposition route to red bronze

Hydrothermal synthesis of potassium molybdenum oxide bronzes: structure-inheriting solid-state route to blue bronze and dissolution/deposition route to red bronze

Energy Storage Performance Enhancement by Surface Engineering of Electrode Materials

Transition metal tetramolybdate dihydrates MMo4O13·2H2O (M=Co,Ni) having a novel pillared layer structure

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