Exceptionally boosted absorption of silicates by interfacial junctions and direct light–heat–energy storage using Mg(OH)2–(Co2SiO4–Co3O4)

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies Pub Date : 2024-10-10 DOI:10.1016/j.susmat.2024.e01142

Rui-Min Hao, En-Xu Ren, Wei Ran, Zhi-Bin Xu, Qin-Pei Wu

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Abstract

Near-infrared (NIR) light absorption is essential for the effective utilization of photothermal solar energy, which is realized via the surface plasmon resonance of a high density of free charge carriers (FCCs). Herein, we demonstrate that S-scheme interfacial junctions (IJs) can substantially increase the FCC density and intensify absorption of silicates from the ultraviolet to NIR region. Numerous p–n IJs with S-scheme types are constructed within sheet-like Co₃O₄–Co₂SiO₄ nanoparticles, exceptionally boosting the light absorption capability over the entire solar spectrum. Moreover, this absorber can improve the photothermal performance of Mg(OH)₂ via a mixture of Mg(OH)₂–(Co₃O₄–Co₂SiO₄) composite. The photothermal dehydration conversion of Mg(OH)₂ in this mixture considerably improves by 6.7 times under 30-min irradiation. The reversibility of the photothermal hydration–dehydration cycles of Mg(OH)₂ improves by 18.3 times, and the thermal storage kinetics substantially improves via the reduction of the activation energy of dehydration (reduction of 25.4 %). Results indicate that Mg(OH)₂–Co₃O₄–Co₂SiO₄ is a promising candidate for a one-step system of photothermal conversion and energy storage.

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利用界面结和 Mg(OH)2-(Co2SiO4-Co3O4)的直接光热储能技术异常提高硅酸盐的吸收率

近红外（NIR）光的吸收对于有效利用光热太阳能至关重要，而这是通过高密度自由电荷载流子（FCC）的表面等离子体共振实现的。在此，我们证明了 S 型界面结 (IJ) 可以大幅提高 FCC 密度，并增强硅酸盐从紫外到近红外区域的吸收。我们在片状 Co3O4-Co2SiO4 纳米粒子中构建了大量具有 S 型结构的 p-n IJ，从而极大地增强了整个太阳光谱的光吸收能力。此外，这种吸收剂还能通过 Mg（OH）2-（Co3O4-Co2SiO4）复合材料的混合物改善 Mg（OH）2 的光热性能。在 30 分钟的辐照条件下，该混合物中 Mg(OH)2 的光热脱水转化率显著提高了 6.7 倍。Mg(OH)2 光热水合-脱水循环的可逆性提高了 18.3 倍，并且通过降低脱水活化能（降低了 25.4%），热储存动力学得到了显著改善。结果表明，Mg(OH)2-Co3O4-Co2SiO4 是光热转换和能量存储一步法系统的理想候选材料。

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来源期刊

Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment

CiteScore

13.40

自引率

4.20%

发文量

158

审稿时长

45 days

期刊介绍： Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.