Temperature-dependent thermal radiative characteristics of micro/nanoparticles for solar photothermal catalysis: experimental and theoretical investigation

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2026-06-01 Epub Date: 2026-01-15 DOI:10.1016/j.ijthermalsci.2026.110689

Guijia Zhang, Shiquan Shan, Ziying Cheng, Jialu Tian, Jinhong Yu, Zhijun Zhou, Kefa Cen

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Abstract

The radiative characteristics of photothermal catalyst particles directly affect the capture and utilization of solar radiation in photothermal chemical reactions. However, mechanisms by how temperature rise affects the radiative characteristics of composite catalyst micro/nanoparticles are neglected. In this study, the temperature-dependent thermal radiative characteristics of the composite CuO/ZnO/Al₂O₃ (Cu/Zn/Al) catalyst were measured and simulated under multi-temperature conditions. The results indicate that when the temperature is greater than 479 K, the normal reflectance of the Cu/Zn/Al particles for near-infrared waveband beyond 1100 nm increases compared with that at room temperature. The optical constants of the catalyst that determine the absorption and scattering properties of particles are temperature dependent and are reported for reference, with a maximum relative variation of 4.71 %. Elevating temperature increases the extinction cross-section of the particles in the near-infrared region, while also enhancing the interaction in particle clusters. In addition to the enhancement of overall extinction, elevated temperature significantly alters the ratio of the scattering cross-section to the absorption cross-section. When the temperature increases to 563K, the relative increase in the scattering/absorption cross-section ratio for near-infrared radiation is up to 40.03 %, accompanied by an enhancement in backscattering. These results suggest that temperature leads to an increase in the catalyst reflectance of near-infrared waveband. The obtained temperature-dependent radiation characteristics provide a reference for the radiation heat transfer calculation application of the photothermal catalytic system.

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用于太阳光热催化的微/纳米颗粒的温度依赖热辐射特性：实验和理论研究

光热催化剂颗粒的辐射特性直接影响光热化学反应中太阳辐射的捕获和利用。然而，温升如何影响复合催化剂微/纳米颗粒辐射特性的机理却被忽视。在本研究中，测量和模拟了多温度条件下CuO/ZnO/Al2O3 （Cu/Zn/Al）复合催化剂的温度依赖性热辐射特性。结果表明：当温度大于479 K时，Cu/Zn/Al颗粒在1100 nm以上近红外波段的法向反射率比室温时增大；决定粒子吸收和散射特性的催化剂光学常数与温度有关，并作为参考，最大相对变化为4.71%。温度升高使粒子在近红外区域的消光截面增大，同时也增强了粒子团簇之间的相互作用。温度升高除了增强了总消光外，还显著改变了散射截面与吸收截面的比值。当温度升高到563K时，近红外辐射散射/吸收截面比的相对增加高达40.03%，同时后向散射增强。这些结果表明，温度导致催化剂近红外波段的反射率增加。所得的温度随辐射特性可为光热催化体系的辐射传热计算应用提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.