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<p>Silver powder oxidation was employed to obtain high-purity AgO powder to address the issues of low purity and poor thermal stability associated with silver peroxide (AgO). The results demonstrated that AgO was produced with high efficiency (96.6%) and exceptional purity (98%) at a reaction temperature of 80&#xa0;°C. The thermal decomposition and kinetic parameters of high-purity AgO in an air atmosphere were determined by thermogravimetry–differential scanning calorimetry (TG-DSC) under non-isothermal conditions. The results demonstrate that the thermal decomposition of AgO occurs in two key stages. The first stage involves the primary decomposition of AgO into Ag<sub>2</sub>O, whereas the second stage involves the decomposition of Ag<sub>2</sub>O into Ag. The Coats-Redfern and Šatava-Šesták methods were employed to establish the kinetic mechanism equation for the primary thermal decomposition stage of AgO. The study showed that the kinetic process of the main thermal decomposition stage of AgO follows the A<sub>1</sub> model, which corresponds to the random nucleation and subsequent reaction model. The average values of apparent activation energies (<i>E</i><sub><i>α</i></sub>) and pre-exponential factors (ln<i>A</i>) obtained by several methods are 133.0&#xa0;kJ&#xa0;mol<sup>−1</sup> and 31.2&#xa0;min<sup>−1</sup>. Finally, the storage life of AgO at various temperatures was calculated.</p>

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Synthesis, characterization and thermal decomposition kinetics of the high-purity AgO

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Xuehua He,
  • Xinyi Wang,
  • Kebiao Zhang,
  • Yuankui Wang,
  • Qian Zhang,
  • Juemin Song,
  • Zheng Li,
  • Hongxu Li,
  • Shenggui Wang,
  • Kun Yu

摘要

Silver powder oxidation was employed to obtain high-purity AgO powder to address the issues of low purity and poor thermal stability associated with silver peroxide (AgO). The results demonstrated that AgO was produced with high efficiency (96.6%) and exceptional purity (98%) at a reaction temperature of 80 °C. The thermal decomposition and kinetic parameters of high-purity AgO in an air atmosphere were determined by thermogravimetry–differential scanning calorimetry (TG-DSC) under non-isothermal conditions. The results demonstrate that the thermal decomposition of AgO occurs in two key stages. The first stage involves the primary decomposition of AgO into Ag2O, whereas the second stage involves the decomposition of Ag2O into Ag. The Coats-Redfern and Šatava-Šesták methods were employed to establish the kinetic mechanism equation for the primary thermal decomposition stage of AgO. The study showed that the kinetic process of the main thermal decomposition stage of AgO follows the A1 model, which corresponds to the random nucleation and subsequent reaction model. The average values of apparent activation energies (Eα) and pre-exponential factors (lnA) obtained by several methods are 133.0 kJ mol−1 and 31.2 min−1. Finally, the storage life of AgO at various temperatures was calculated.