气候变化领域集成服务门户(CCPortal): Photocatalytic cement-based passive cooling composites: The synergy between radiative cooling and self-cleaning mechanisms

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DOI	10.1016/j.jobe.2024.108749
	Photocatalytic cement-based passive cooling composites: The synergy between radiative cooling and self-cleaning mechanisms
	Liu, Daoru; Zepper, J. C. O.; Fan, Daiwei; Yu, Qingliang
发表日期	2024
EISSN	2352-7102
起始页码	85
卷号	85
英文摘要	Radiative cooling holds promise in combating climate change by reducing energy consumption. However, organic radiative coolers face fabrication complexities, weak environmental reliability, and limited self-cleaning capabilities. To overcome these challenges, we present autoclaved cement pastes, inorganic passive coolers with exceptional energy-free cooling and self-cleaning properties, achieved through a straightforward hydrothermal process. The inorganic cooler incorporating 28 wt% alumina exhibits impressive solar reflectivity (0.91), atmospheric window emissivity (0.91), radiative cooling power (-11.0 W/m(2)), and effective evaporative cooling (>8 h, 25 W/m(2)). The high solar reflectivity is attributed to tailored nano/micro particles and pores inducing strong Mie scattering within the solar spectral range (lambda = 280-2500 nm). The theoretical cooling properties are validated by the outdoor on-site measurements, and the roles of moisture inside the cooler matrix are verified. Additionally, the cooler formulation featuring 14 wt% nanosilica and 14 wt% alumina demonstrates remarkable self-cleaning capabilities, eliminating approximately 68% of surface contaminants within 30 min. This self-cleaning performance stems from the evolution of C-S-H phases, leading to the formation of massive nano C-(A)-S-H honeycombs with nanowires, enhancing mass adsorption and photocatalytic quantum effects at abundant active sites. This study would open new avenues for scalable, energy-free cement-bound cooling materials for building engineering and align with the UN's sustainable development goals.
英文关键词	Radiative cooling; Self-cleaning; Tobermorite; Hydrogarnet; Boehmite; Atmospheric window
语种	英语
WOS研究方向	Construction & Building Technology ; Engineering
WOS类目	Construction & Building Technology ; Engineering, Civil
WOS记录号	WOS:001185677400001
来源期刊	JOURNAL OF BUILDING ENGINEERING
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/297106
作者单位	Wuhan University; Eindhoven University of Technology; Eindhoven University of Technology
推荐引用方式 GB/T 7714	Liu, Daoru,Zepper, J. C. O.,Fan, Daiwei,et al. Photocatalytic cement-based passive cooling composites: The synergy between radiative cooling and self-cleaning mechanisms[J],2024,85.
APA	Liu, Daoru,Zepper, J. C. O.,Fan, Daiwei,&Yu, Qingliang.(2024).Photocatalytic cement-based passive cooling composites: The synergy between radiative cooling and self-cleaning mechanisms.JOURNAL OF BUILDING ENGINEERING,85.
MLA	Liu, Daoru,et al."Photocatalytic cement-based passive cooling composites: The synergy between radiative cooling and self-cleaning mechanisms".JOURNAL OF BUILDING ENGINEERING 85(2024).