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Complementary enhanced solar thermal conversion performance of core- shell nanoparticles

机译:核壳纳米粒子的互补增强的太阳热转化性能

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In this study, the properties of various types of core-shell nanoparticles (NPs) were evaluated using the finite difference time domain (FDTD) method towards the enhancement of solar absorption performance. Results showed that the resonance wavelength of SiO2@Au NPs lay in the 540-900 nm range, covering the near-infrared and visible regions. The resonance wavelength of SiO2@Ag NPs lay in the 390-830 nm range, covering the entire visible region. SiO2@Au nanofluid with a core-shell ratio of phi = 0.2 exhibited the highest solar absorption efficiency with 64% less Au consumption compared to pure Au NPs. For mixed nanofluids, the mixtures featuring core-shell ratios of 0.1 and 0.6 with mixing ratios of 0.5 for SiO2@Au and 0.6 for SiO2@Ag gave the highest absorption efficiencies. In addition, the peak solar absorption efficiency of a mixed nanofluid of SiO2@Au (phi = 0.1) and SiO2@Ag (phi = 0.4) with a mixing ratio of 0.58 was as high as 94A%. Solar thermal conversion experiments revealed that, under the same conditions, a Au-decorated SiO2 nanofluid showed a comparable efficiency to the calculated solar absorption efficiency of the SiO2@Au core-shell nanofluid (similar to 95.2%); it was as high as 95.9%, higher than those of Au NPs and SiO2 NPs. These results showed that adjusting the core-shell ratios and tuning the mixing ratios of different nanofluids are two efficient methods to enhance the solar absorption efficiencies of SiO2@Au and SiO2@Ag NPs under the optimal conditions.
机译:在这项研究中,使用有限差分时域(FDTD)方法评估了各种类型的核-壳纳米颗粒(NPs)的性能,以提高太阳能吸收性能。结果表明,SiO2 @ Au NPs的共振波长在540-900 nm范围内,覆盖了近红外和可见光区域。 SiO2 @ Ag NPs的共振波长在390-830 nm范围内,覆盖了整个可见光区域。与纯金纳米颗粒相比,核壳比为phi = 0.2的SiO2 @ Au纳米流体表现出最高的太阳能吸收效率,而金的消耗量却减少了64%。对于混合的纳米流体,其核-壳比为0.1和0.6,SiO2 @ Au的混合比为0.5,SiO2 @ Ag的混合比为0.6的混合物具有最高的吸收效率。另外,混合比为0.58的SiO 2 @Au(phi = 0.1)和SiO 2 @ Ag(phi = 0.4)的混合纳米流体的峰值太阳吸收效率高达94A%。太阳热转换实验表明,在相同条件下,Au修饰的SiO2纳米流体显示出与SiO2 @ Au核壳纳米流体计算的太阳吸收效率相当的效率(约95.2%)。高达95.9%,高于金纳米颗粒和二氧化硅纳米颗粒。这些结果表明,在最佳条件下,调节核壳比和调节不同纳米流体的混合比是提高SiO2 @ Au和SiO2 @ Ag NPs太阳吸收效率的两种有效方法。

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