MXene纳米流体光热转化特性的数值模拟与实验研究

Numerical Simulation and Experimental Study of the Photothermal Conversion Properties of MXene Nanofluids

为探究新型MXene纳米流体在太阳能光热领域的应用潜力,从数值模拟和实验两个方面对MXene纳米流体的相关特性进行了系统的研究。通过时域有限差分法模拟计算了MXene片层堆叠对其光吸收性能的影响机制,计算结果表明层数越少的MXene更适合制备纳米流体用于光热转化。然后通过两步法制备了不同浓度的少层MXene纳米流体,测定MXene浓度变化对纳米流体光吸收的影响。结果表明浓度为60 mg·L^(-1)的MXene纳米流体的平均吸收率高达97.9%,表明该流体具有出色的光吸收特性。同时,MXene纳米流体的光热转化效率随着浓度的增加先升高后降低,浓度为20 mg·L^(-1)时达到最高值63.44%。

In order to explore the potential of the novel MXene nanofluid for solar thermal applications,the relevant properties of MXene nanofluid were systematically investigated from both numerical simulations and experiments.The mechanism of the effect of MXene sheet stacking on its light absorption performance was simulated by the finite-difference time-domain method,and the calculation results showed that MXene with fewer layers was more suitable for preparing nanofluids for photothermal conversion.Few-layer MXene nanofluids with different concentrations were prepared by a two-step method to determine the effect of MXene concentration variation on the light absorption of nanofluids.The result showed that an average absorption of 97.9%for MXene nanofluids at 60 mg·L^(-1),indicating excellent light absorption properties.The photothermal conversion efficiency increases and then decreases with increasing concentration,reaching the highest value of 63.44%at 20 mg·L^(-1).