Isothermal decomposition kinetics of nickel (II) hydroxide powder

Carney, Casey; Chinn, Richard E.; Doğan, Ömer; Gao, Michael C.

doi:10.1016/j.jallcom.2015.03.256

Cited by 23 publications

(24 citation statements)

References 27 publications

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“…Nucleation and structural evolution of Ni nanoparticles have been further studied at atomic resolution. At 200 °C, nuclei of ~1 nm were formed on the [Ca2Nb3O10] − nanosheets (Figure 4a) during in situ heating in vacuum, in agreement with the decomposition temperature of Ni(OH)2 [10,21,22]. The nuclei were found on single and multiple layers of nanosheets, as individual layers were identified by the fast Fourier transform patterns in Figure 4b.…”

Section: Structural Evolution Of the Nanocomposite During In Situ Heasupporting

confidence: 65%

“…were loaded on the nanosheets with OH − counter-ions that are ready to form β-Ni(OH)2 phases upon further Ni loading. As Ni(OH)2 is known to undergo thermal decomposition from temperatures as low as 200 °C [10,21,22], heat treatment was performed at 500 °C for 10 min where the [Ca2Nb3O10] − nanosheets remain stable [37]. As shown in Figure 1d, this heat treatment of the nanocomposites with 3 wt% Ni loading for 10 min at 500 °C can readily change their optical appearance depending on the environment.…”

Section: Loading Of Ni On [Ca 2 Nb 3 O 10 ] − Nanosheetsmentioning

confidence: 99%

“…Thermal decomposition of Ni(OH) 2 [10,21,22] and reduction of NiO [23][24][25][26] have been studied since many decades given their technological importance. In photocatalytic nanocomposites, however, co-catalysts are usually dispersed in much less quantity relative to the photoabsorber [4].…”

Section: Introductionmentioning

confidence: 99%

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Structural Evolution of Ni-Based Co-Catalysts on [Ca2Nb3O10]− Nanosheets during Heating and Their Photocatalytic Properties

et al. 2019

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Nickel compounds are among the most frequently used co-catalysts for photocatalytic water splitting. By loading Ni(II) precursors, submonolayer Ni(OH)2 was uniformly distributed onto photocatalytic [Ca2Nb3O10]− nanosheets. Further heating of the nanocomposite was studied both ex situ in various gas environments and in situ under vacuum in the scanning transmission electron microscope. During heating in non-oxidative environments including H2, argon and vacuum, Ni nanoparticles form at ≥200 °C, and they undergo Ostwald ripening at ≥500 °C. High resolution imaging and electron energy loss spectroscopy revealed a NiO shell around the Ni core. Ni loading of up to 3 wt% was demonstrated to enhance the rates of photocatalytic hydrogen evolution. After heat treatment, a further increase in the reaction rate can be achieved thanks to the Ni core/NiO shell nanoparticles and their large separation.

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Section: Structural Evolution Of the Nanocomposite During In Situ Heasupporting

confidence: 65%

Section: Loading Of Ni On [Ca 2 Nb 3 O 10 ] − Nanosheetsmentioning

confidence: 99%

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Structural Evolution of Ni-Based Co-Catalysts on [Ca2Nb3O10]− Nanosheets during Heating and Their Photocatalytic Properties

et al. 2019

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“…In air, Co(OH) 2 decomposes to Co 3 O 4 above 350 °C which then coverts to CoO at T > 800 °C. − In an inert environment, Co(OH) 2 decomposes to CoO at T > 180 °C. , There is no general agreement in the literature regarding the decomposition mechanism of brucite-like hydroxides. Decomposition in an inert environment has been variously reported to follow the contracting geometry, , the first order, and the Avrami-Erofeev model. However, very limited data have been reported on the hydrothermal decomposition of Co(OH) 2 and other transition metal hydroxides.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Decomposition of Cobalt Hydroxide in Saturated Water Vapor

Dwivedi

Sharma

Rajagopalan

et al. 2019

Ind. Eng. Chem. Res.

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The hydrothermal decomposition of cobalt hydroxide is of importance in understanding corrosion in nuclear reactors, in the industrial production of cobaltous oxide, and potentially for thermal energy storage. The kinetics of decomposition in the presence of water vapor is poorly understood but nevertheless important in the above situations. The decomposition reaction has mainly been studied in air or inert environments. Here, we report data on the kinetics of the decomposition reaction at temperatures up to 270 °C in the presence of saturated water vapor. We show that CoO can be obtained as the decomposition product under a low dissolved oxygen level of <2 mg/L. The decomposition follows the Avrami Erofeev kinetics model with rate constants of 0.3 h −1 and 0.56 h −1 at 260 and 270 °C, respectively. In comparison, decomposition in N 2 and air environments showed much faster rates on the order of min −1 . Data reported here are important in the fundamental understanding of the reaction kinetics and in identifying the mechanism for the decomposition of cobalt hydroxide and other brucite-like hydroxides.

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“…However, there is an endothermic process at 267 8C with 274 J g À1 energy consumption and 11 wt.% mass decrease. This behavior should be attributed to partial decomposition of nickel hydroxide which can occur between 250-340 8C [17]. The analysis results for AlÀCe(OH) 4 mixture are presented in Figure 5d.…”

Section: Resultsmentioning

confidence: 93%

Hydroxide‐Based Nanoenergetic Materials

Yolchinyan

Eads

Hobosyan

et al. 2019

Propellants Explo Pyrotec

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Hydroxide‐aluminum based nano‐energetic materials are new class of thermites which demonstrated high theoretical energy capacity of up to 50 kJ cm−3. Most of the hydroxide‐aluminum based systems exhibit a large gas generation (greater than two liters per gram) and high adiabatic combustion temperature (up to 3000 K), which ensures performance that attributes significantly for applications such as solid fuel propulsion, explosives, airbag deployment, etc. Thermodynamic calculations performed for a collection of 16 novel hydroxide‐based nano‐thermite systems show that most of the systems are stable. Four systems, based on bismuth, copper, nickel and cerium hydroxides, were mixed with aluminum to prepare nano‐thermites compositions. These formulations were tested to estimate the heat generation and pressure discharge values during the ignition. These systems were stable below ignition temperature, between 570–600 °C. The strongest performance was recorded for Al−Bi(OH)3 formulation with 5.6 kPa*m3 g−1 peak pressure, which is comparable to highest values reported in literature.

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Isothermal decomposition kinetics of nickel (II) hydroxide powder

Cited by 23 publications

References 27 publications

Structural Evolution of Ni-Based Co-Catalysts on [Ca2Nb3O10]− Nanosheets during Heating and Their Photocatalytic Properties

Structural Evolution of Ni-Based Co-Catalysts on [Ca2Nb3O10]− Nanosheets during Heating and Their Photocatalytic Properties

Hydrothermal Decomposition of Cobalt Hydroxide in Saturated Water Vapor

Hydroxide‐Based Nanoenergetic Materials

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