Kinetics analysis of non-isothermal decomposition of Ag2O-graphite mixture

Shahcheraghi, Seyed Hadi; Khayati, Gholam Reza

doi:10.1016/s1003-6326(14)63436-1

Cited by 16 publications

(9 citation statements)

References 42 publications

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“…Even though both of these models had a bit of similarity in their mathematical interpretations, one must also consider that the nucleation model is rate controlled by the autocatalytic nucleation step whereas the contracting sphere model is rate controlled by the topochemical reaction occurring at the reaction interface, which account for the variations in their physical interpretations on the reduction mechanism. The autocatalytic nucleation step is attributed to the formation of Ag nuclei during the initial reduction phase on the boundaries of Ag 2 O particles, which are autocatalytic for further Ag 2 O reduction …”

Section: Resultsmentioning

confidence: 99%

“…The autocatalytic nucleation step is attributed to the formation of Ag nuclei during the initial reduction phase on the boundaries of Ag 2 O particles, which are autocatalytic for further Ag 2 O reduction. [23,24] Besides the unimolecular decay mechanism, there are other nucleation models that can describe the uniform internal reduction via different mathematical expressions. Examples of such models would be crackling core [49,50] and Avrami-Erofeev models.…”

Section: /T Max (K -1 )mentioning

confidence: 99%

“…[17,18] As for silver(I) oxide, its current study is more established in its thermal decomposition as compared with H 2 -based reduction. The majority of the works on Ag 2 O thermal decomposition [19][20][21][22][23][24] were reported on its autocatalytic nature and nucleation mechanism while H 2 -based Ag 2 O reduction experiments by Jeli c et al, [13] Juarez and Morales [12] also reported likewise.…”

Section: Introductionmentioning

confidence: 99%

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Temperature‐programmed reduction of silver(I) oxide using a titania‐supported silver catalyst under a H₂ atmosphere

Lup

Abnisa

Daud

et al. 2019

J Chinese Chemical Soc

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Reduction kinetics of silver(I) oxide using a titania‐supported silver catalyst was analyzed using temperature‐programmed reduction (TPR) with hydrogen as a reducing gas. Ag2O reduction to Ag was observed in all samples as a single reduction step occurring at two reduction peaks. Observation of these reduction peaks indicates the existence of different lattice oxygen species, that is, surface and bulk, which are, respectively, attributed to surficial and pore‐deposited Ag2O aggregates. The powdered samples exhibited high reducibility with average final oxidation states ranging from 0 to +0.18. The apparent activation energies for Ag2O reduction to Ag metal were 73.35 and 81.71 kJ/mol for surficial and pore‐deposited Ag2O aggregates, respectively. In this study, a unimolecular decay model was reported to accurately describe the reduction mechanism of Ag/TiO2 catalysts. Hence, this would also infer that the catalyst reduction is rate‐limited by the nucleation of Ag metal instead of the topochemical reaction and the diffusion of hydrogen and oxygen molecules.

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Section: Resultsmentioning

confidence: 99%

Section: /T Max (K -1 )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature‐programmed reduction of silver(I) oxide using a titania‐supported silver catalyst under a H₂ atmosphere

Lup

Abnisa

Daud

et al. 2019

J Chinese Chemical Soc

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“…This is because the silver particles are oxidized during the high-energy dispersion process for colloidally dispersed ink. Whereas the peaks of Ag metal appear from the heat treatment at 750 • C on 368.6 ± 0.1, 374.6 ± 0.1 eV [35], which implies the Ag 2 O is thermally decomposed as the chemical reaction below [36].…”

Section: Structural Morphological and Compositional Properties Of Ito...mentioning

confidence: 99%

Electrically Tunable Solution-Processed Transparent Conductive Thin Films Based on Colloidally Dispersed ITO@Ag Composite Ink

Lim

Kim

et al. 2022

Nanomaterials

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Silver (Ag) introduced colloidal Sn-doped In2O3 (ITO) ink for transparent conductive electrodes (TCEs) was prepared to overcome the limitation of colloidally prepared thin film; low density thin film, high resistance. ITO@Ag colloid ink was made by controlling the weight ratio of ITO and Ag nanoparticles through ball-milling and fabricated using spin coating. These films were dried at 220 °C and heat-treated at 450–750 °C in an air atmosphere to pyrolyze the organic ligand attached to the nanoparticles. All thin films showed high crystallinity. As the thermal treatment temperature increased, films showed a cracked surface, but as the weight percentage of silver increased, a flattened and smooth surface appeared, caused by the metallic silver filling the gap between the nano-particles. This worked as a bridge to allow electrical conduction, which decreases the resistivity over an order of magnitude, from 309 to 0.396, and 0.107 Ω·cm for the ITO-220 °C, ITO-750 °C, and ITO@Ag (7.5 wt.%)-750 °C, respectively. These films also exhibited >90% optical transparency. Lowered resistivity is caused due to the inclusion of silver, providing a sufficient number of charge carriers. Furthermore, the work function difference between ITO and silver builds an ohmic junction, allowing fluent electrical flow without any barrier.

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“…The reduction reaction of Ag 2 O in air was observed at 623 K, 2) whereas Ag 2 O under a hydrogen atmosphere began to decompose at around 400 K. 3) In addition, the two-step reduction reaction of a mixture of Ag 2 O and graphite powder was observed. 4) The first step of the reduction reaction occurred at around 470-490 K, and the second step of the reduction reaction, which occurred at 635-673 K, resulted in the formation of bulk crystalline Ag. On the other hand, there have been a very large number of studies on the shockinduced decomposition of materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of dynamic high-pressure loading on decomposition reaction and negative thermal expansion of silver oxide

Kishimura

Shimono

Abe

2022

Jpn. J. Appl. Phys.

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The effect of dynamic high-pressure loading on the decomposition reaction and negative thermal expansion of Ag2O was investigated by X-ray diffraction (XRD) analysis and differential scanning calorimetry (DSC). The XRD pattern of the sample shocked at 6.4 GPa indicated that the sample was composed of cubic phase Ag2O and metallic Ag. These XRD patterns indicated that the shock-induced decomposition reaction of Ag2O occurred when the sample was shock-loaded at 6.4 GPa and above. The DSC curves of the shocked Ag2O revealed that an additional exothermic reaction occurred at around 478 K in addition to an endothermic reaction at around 700 K, which corresponds to the decomposition of Ag2O. The exothermic reaction at around 478 K was probably caused by the release of shock-induced residual energy. Synchrotron XRD performed from 300 K to 130 K clarified the suppression of negative thermal expansion in the shocked Ag2O.

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Kinetics analysis of non-isothermal decomposition of Ag2O-graphite mixture

Cited by 16 publications

References 42 publications

Temperature‐programmed reduction of silver(I) oxide using a titania‐supported silver catalyst under a H₂ atmosphere

Temperature‐programmed reduction of silver(I) oxide using a titania‐supported silver catalyst under a H₂ atmosphere

Electrically Tunable Solution-Processed Transparent Conductive Thin Films Based on Colloidally Dispersed ITO@Ag Composite Ink

Effect of dynamic high-pressure loading on decomposition reaction and negative thermal expansion of silver oxide

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Kinetics analysis of non-isothermal decomposition of Ag2O-graphite mixture

Cited by 16 publications

References 42 publications

Temperature‐programmed reduction of silver(I) oxide using a titania‐supported silver catalyst under a H2 atmosphere

Temperature‐programmed reduction of silver(I) oxide using a titania‐supported silver catalyst under a H2 atmosphere

Electrically Tunable Solution-Processed Transparent Conductive Thin Films Based on Colloidally Dispersed ITO@Ag Composite Ink

Effect of dynamic high-pressure loading on decomposition reaction and negative thermal expansion of silver oxide

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Product

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Temperature‐programmed reduction of silver(I) oxide using a titania‐supported silver catalyst under a H₂ atmosphere

Temperature‐programmed reduction of silver(I) oxide using a titania‐supported silver catalyst under a H₂ atmosphere