Conventional oven drying (COD) and supercritical drying (SCD) methods wereapplied to the preparation of Mn-substituted hexaaluminate (BaMnAl_(11)O_(19-α)) catalysts. Theeffect of drying methods on phase composition, ...Conventional oven drying (COD) and supercritical drying (SCD) methods wereapplied to the preparation of Mn-substituted hexaaluminate (BaMnAl_(11)O_(19-α)) catalysts. Theeffect of drying methods on phase composition, specific surface area, pore structure, reductionbehavior of Mn^(3+) ions, and combustion activity of the samples was investigated. The homogenousmixing of the components in the sol-gel process could be maintained by SCD, and the hexaaluminatephase was almost the only phase of the resulting materials after calcination. H_2-TPR revealed thatthe Mn^(3+) ions in the sample obtained by SCD were easier to be reduced than that by COD. Moreover,the samples obtained by SCD have higher surface area, narrower pore size distribution, and highercombustion activity than those obtained by COD.展开更多
Carbon dots(CDs),as an emerging class of zero-dimensional carbon-based nanomaterials,have attracted widespread attention owing to their remarkable optical properties,solution processability,and environmental friendlin...Carbon dots(CDs),as an emerging class of zero-dimensional carbon-based nanomaterials,have attracted widespread attention owing to their remarkable optical properties,solution processability,and environmental friendliness,showing broad application prospects in optoelectronic devices.Nevertheless,although significant research progress has been achieved in recent years,a comprehensive theoretical framework is still absent for clarifying the correlations among the structure,optical properties,and performance of CDs in practical device applications.In this regard,the present review highlights recent developments in utilizing the distinctive optical features of CDs for various optoelectronic systems,including key examples such as photodetectors,optical memristors,lasers,electroluminescent diodes,and photovoltaic cells.Moreover,the current limitations and future research directions for CDs-based optoelectronic technologies are analyzed.The insights provided herein are expected to stimulate further research on enhancing the optical properties of CDs and promoting the rational design of high-performance devices from a new perspective.展开更多
文摘Conventional oven drying (COD) and supercritical drying (SCD) methods wereapplied to the preparation of Mn-substituted hexaaluminate (BaMnAl_(11)O_(19-α)) catalysts. Theeffect of drying methods on phase composition, specific surface area, pore structure, reductionbehavior of Mn^(3+) ions, and combustion activity of the samples was investigated. The homogenousmixing of the components in the sol-gel process could be maintained by SCD, and the hexaaluminatephase was almost the only phase of the resulting materials after calcination. H_2-TPR revealed thatthe Mn^(3+) ions in the sample obtained by SCD were easier to be reduced than that by COD. Moreover,the samples obtained by SCD have higher surface area, narrower pore size distribution, and highercombustion activity than those obtained by COD.
基金supported by the National Natural Science Foundation of China(U24A2079)Anhui Provincial Excellent Scientific Research and Innovation Team(2022AH010062).
文摘Carbon dots(CDs),as an emerging class of zero-dimensional carbon-based nanomaterials,have attracted widespread attention owing to their remarkable optical properties,solution processability,and environmental friendliness,showing broad application prospects in optoelectronic devices.Nevertheless,although significant research progress has been achieved in recent years,a comprehensive theoretical framework is still absent for clarifying the correlations among the structure,optical properties,and performance of CDs in practical device applications.In this regard,the present review highlights recent developments in utilizing the distinctive optical features of CDs for various optoelectronic systems,including key examples such as photodetectors,optical memristors,lasers,electroluminescent diodes,and photovoltaic cells.Moreover,the current limitations and future research directions for CDs-based optoelectronic technologies are analyzed.The insights provided herein are expected to stimulate further research on enhancing the optical properties of CDs and promoting the rational design of high-performance devices from a new perspective.
