Solar Energy Materials and Solar Cells最新文献_第7页

A coupled optical-thermal-fluid-structural analysis of parabolic trough solar collector by deformation coupling instant ray-tracing multiple iteration method 利用变形耦合瞬时光线跟踪多重迭代法对抛物槽式太阳能集热器进行光-热-流体-结构耦合分析

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells

Pub Date : 2024-10-18 DOI: 10.1016/j.solmat.2024.113221

Yunyi Han , Lu Li , Shuoshuo Wang , Zhang Bai , Qi Li

Parabolic trough solar collectors (PTC) have been widely applied in concentrating solar power generation and solar heating. During typical operation processes, due to the interaction between the bending deformation and the non-uniform solar flux concentration of the receiver tube, the PTC presents a complex multi-physical coupling phenomenon, which seriously influences the concentrating characteristic and solar-to-thermal conversion efficiency. In order to improve the accuracy of multiphysics simulation, a fully coupled optical-thermal-fluid-structural simulation model is developed by considering the novel structure-deformation coupling instant ray-tracing method. Based on the case study refers to the Euro Trough 150 type collector and the Schott PTR70 type solar receiver, the optical-thermal-fluid-structural coupling characteristics of PTC has been comprehensively investigated. The results indicate that the calculation error of the receiver tube deformation decreases by 16 %, indicating significant improvement in multiphysics coupling. Under the dynamic tracking process, increasing the tracking angle of the adopted PTC module to 90° from 0°results in a corresponding peak solar flux improvement to 73.84 kW/m² from 72.41 kW/m². Due to the thermal stress and gravity, the maximum concavity decreases to 6.64 mm from 9.58 mm and the maximum convexity increases to 1.89 mm from 1.13 mm. This new method provides a feasible reference for optimization and regulation of PTCs.

抛物面槽式太阳能集热器（PTC）已广泛应用于聚光太阳能发电和太阳能供热领域。在典型的运行过程中，由于受光管的弯曲变形和非均匀太阳光通量集中之间的相互作用，抛物面槽式太阳能集热器呈现出复杂的多物理场耦合现象，严重影响了其聚光特性和光热转换效率。为了提高多物理场仿真的精度，通过考虑新颖的结构-变形耦合瞬时光线跟踪方法，建立了光-热-流-结构全耦合仿真模型。以欧洲槽式 150 型集热器和肖特 PTR70 型太阳能接收器为例，全面研究了 PTC 的光-热-流-结构耦合特性。结果表明，接收管变形的计算误差减少了 16%，表明多物理场耦合有了显著改善。在动态跟踪过程中，采用的 PTC 模块的跟踪角从 0°增加到 90°，相应的峰值太阳通量从 72.41 kW/m2 提高到 73.84 kW/m2。由于热应力和重力的影响，最大凹度从 9.58 mm 减小到 6.64 mm，最大凸度从 1.13 mm 增加到 1.89 mm。这种新方法为 PTC 的优化和调节提供了可行的参考。

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引用次数: 0

Comparative thermal model analysis and experimental validation for predicting performance of a pyramidal solar still with integrated pulsating heat pipe 预测集成脉动热管的金字塔形太阳能蒸发器性能的热模型比较分析和实验验证

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells

Pub Date : 2024-10-18 DOI: 10.1016/j.solmat.2024.113220

Nagendra Pandey, Y. Naresh

Developing nations face a dire situation as water scarcity and pollution significantly impact various aspects of life. It's crucial to take action now to address these pressing issues and ensure a sustainable future for all. Solar desalination processes emerge as a promising solution to these pressing problems in water purification technologies.

This paper reports the thermal modeling and experimental results of two solar still designs, namely (i) Pyramidal solar still with pulsating heat pipe (PHP), Modified pyramidal solar still (MPSS), and (ii) conventional pyramidal solar still (CPSS). This study uses energy balance equations to focus on MPSS and CPSS thermal modeling. In the MPSS, a PHP, in conjunction with a solar collector, provides external heat to basin water. Several models, including Dunkel, Kumar and Tiwari, Chen, and Zheng Hongfei, are utilized to estimate the performance of both MPSS and CPSS. Extensive experiments have been conducted for validation purposes. Key parameters considered for prediction and comparison include evaporative heat transfer coefficient, convective heat transfer coefficient, total heat transfer coefficient, and hourly yield. It is noted that the Kumar and Tiwari model demonstrates a superior ability to predict cumulative yield, with a percentage error of 5.81 % and 5.9 % for MPSS and CPSS, respectively, compared to the experimental cumulative yield. The theoretical average basin water temperature observed in MPSS is 64.56 °C, and CPSS is 58.8 °C. The enhancement in temperature is attributed to the supplementary heat provided by the PHP.

发展中国家面临着严峻的形势，缺水和污染严重影响着生活的各个方面。现在就采取行动解决这些紧迫问题并确保所有人拥有一个可持续发展的未来至关重要。本文报告了两种太阳能蒸馏器设计的热建模和实验结果，即（i）带脉动热管（PHP）的金字塔形太阳能蒸馏器（MPSS）和（ii）传统金字塔形太阳能蒸馏器（CPSS）。本研究采用能量平衡方程，重点对 MPSS 和 CPSS 进行热建模。在 MPSS 中，PHP 与太阳能集热器一起为池水提供外部热量。包括 Dunkel、Kumar 和 Tiwari、Chen 和 Zheng Hongfei 在内的多个模型被用来估算 MPSS 和 CPSS 的性能。为了验证，还进行了大量实验。用于预测和比较的关键参数包括蒸发传热系数、对流传热系数、总传热系数和每小时产量。结果表明，Kumar 和 Tiwari 模型在预测累积产量方面表现出色，与实验累积产量相比，MPSS 和 CPSS 的百分比误差分别为 5.81 % 和 5.9 %。在 MPSS 中观测到的理论平均流域水温为 64.56 °C，CPSS 为 58.8 °C。温度的提高归因于 PHP 提供的补充热量。

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引用次数: 0

High-efficiency n-TOPCon cells ensured by an emitter preparation process without post-oxidation 无需后氧化的发射极制备工艺确保了高效 n-TOPCon 电池的实现

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells

Pub Date : 2024-10-18 DOI: 10.1016/j.solmat.2024.113223

Xinlu Li , QinQin Wang , Xu Dong , Jiadong Li , XinYu Zhang , Ningyi Yuan , Lvzhou Li , Jianning Ding

Laser-enhanced contact optimisation (LECO) technology can effectively improve the efficiency of tunnel oxide passivated contact (n-TOPCon) solar cells. Generally, the preparation of an emitter in TOPCon cells requires post-oxidation treatment at temperatures exceeding 1030 °C for over 3000 s. This high-temperature post-oxidation process results in reduced surface doping concentration, increased reflectivity of the front of the cell and elevated manufacturing costs of the junction. In this study, through process research, we reveal that the optimal profile depth of emitter (the boron doping concentration at 1 × 10¹⁸ atoms/cm³) for mass-produced LECO pastes ranges from 0.44 to 0.52 μm. Additionally, it was discovered that a boron-rich layer (BRL) thinner than 10 nm does not reduce bulk lifetime and increase contact resistivity. Based on these findings, we developed a boron-diffusion method without post-oxidation, which involves controlling the BRL thickness by adjusting the pre-oxidation layer thickness and cycle deposition. When applied to the mass production of n-TOPCon solar cells, this approach resulted in a solar cell conversion efficiency of 26.28 %. This represents an improvement of 0.03 %–0.05 % over traditional boron-diffusion processes. Furthermore, eliminating post-oxidation significantly improved the production capacity and lifespan of the boron-diffusion furnace, thereby reducing the manufacturing costs associated with the solar cells. Furthermore, eliminating post-oxidation significantly improved the production capacity and lifespan of the boron-diffusion furnace, thereby reducing the manufacturing costs associated with the solar cells.

激光增强接触优化（LECO）技术可有效提高隧道氧化物钝化接触（n-TOPCon）太阳能电池的效率。一般来说，在制备 TOPCon 电池的发射极时，需要在超过 1030 °C 的温度下进行超过 3000 秒的后氧化处理。这种高温后氧化处理会导致表面掺杂浓度降低、电池正面反射率增加以及结点制造成本上升。在本研究中，通过工艺研究，我们发现量产 LECO 浆料的最佳发射极剖面深度（硼掺杂浓度为 1 × 1018 个原子/立方厘米）为 0.44 至 0.52 μm。此外，我们还发现，厚度小于 10 nm 的富硼层（BRL）不会降低体寿命和增加接触电阻率。基于这些发现，我们开发了一种无后氧化的硼扩散方法，即通过调整预氧化层厚度和循环沉积来控制富硼层厚度。在大规模生产 n-TOPCon 太阳能电池时，这种方法使太阳能电池的转换效率达到 26.28%。这比传统的硼扩散工艺提高了 0.03 %-0.05 %。此外，消除后氧化显著提高了硼扩散炉的生产能力和使用寿命，从而降低了太阳能电池的相关制造成本。此外，消除后氧化显著提高了硼扩散炉的生产能力和使用寿命，从而降低了太阳能电池的相关制造成本。

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引用次数: 0

Experimental enhancement study of thermophysical properties of ternary carbonate phase change material with multi-dimensional nanoparticles 多维纳米颗粒三元碳酸盐相变材料热物理性质的实验增强研究

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells

Pub Date : 2024-10-16 DOI: 10.1016/j.solmat.2024.113222

Meiyang Xu, Gaosheng Wei, Chao Huang, Xiaoze Du

Carbonates have great application potential as heat transfer and thermal energy storage media in the development of future phase change materials. This paper gives thermophysical properties enhancement study on ternary carbonates in liquid state by adding aluminum oxide nanoparticles, multi-walled carbon nanotubes, graphene nanosheets, and experimentally evaluate the performance strengthen ability of multi-dimensional nanoparticles. The thermal diffusivities and specific heats of the prepared samples by the water solution method are determined using the laser flash technique and the differential scanning calorimetry at liquid state, respectively. A thermogravimetric analyzer is deployed for evaluate the high-temperature thermal stability of the composite ternary carbonates. Scanning electron microscopy and Fourier transform infrared spectroscopy techniques are utilized to examine the surface morphologies and chemical structures of the samples. The results indicate that there is a cooperative reinforcement impact on the thermophysical properties of ternary carbonate by utilizing zero-dimensional Al₂O₃ nanoparticles and two-dimensional graphene nanosheets, with a maximum improvement of 56.7 % for thermal conductivity, and 10.3 % for specific heat, which is apparently larger than adding any single nanoparticle. The composites exhibit superior thermal cycling stability after low-high temperature experiment, and samples can maintain thermal stability until 700 °C in the thermogravimetric analysis.

碳酸盐作为传热和热能储存介质在未来相变材料的发展中具有巨大的应用潜力。本文通过添加氧化铝纳米粒子、多壁碳纳米管、石墨烯纳米片，对液态三元碳酸盐进行了热物理性质增强研究，并通过实验评估了多维纳米粒子的性能增强能力。利用激光闪烁技术和差示扫描量热法分别测定了水溶液法制备的样品在液态下的热扩散率和比热。热重分析仪用于评估复合三元碳酸盐的高温热稳定性。扫描电子显微镜和傅立叶变换红外光谱技术用于研究样品的表面形态和化学结构。结果表明，利用零维 Al2O3 纳米粒子和二维石墨烯纳米片对三元碳酸盐的热物理性质有协同增强作用，热导率最大提高了 56.7%，比热提高了 10.3%，这显然大于添加任何单一纳米粒子的效果。在低温-高温实验后，复合材料表现出卓越的热循环稳定性，在热重分析中，样品的热稳定性可保持到 700 ℃。

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引用次数: 0

A contactless method of emitter sheet resistance measurement for silicon wafers 硅晶片发射极片电阻测量的非接触式方法

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells

Pub Date : 2024-10-16 DOI: 10.1016/j.solmat.2024.113209

Yan Zhu, Thorsten Trupke, Ziv Hameiri

The emitter sheet resistance is an essential parameter impacting the efficiency of silicon solar cells with diffused layers. Conventional measurement methods of this parameter either require electrical contacts or are impacted by the bulk resistivity of the measured samples. In this study, a novel method based on the combination of eddy-current conductance and photoluminescence imaging is developed for a contactless determination of the emitter sheet resistance. Numerical simulation is used to establish the correlation between the photoluminescence profile and the sum of the emitter and bulk resistance. Together with eddy-current conductance measurements, the emitter sheet resistance and bulk resistance can be separated. The accuracy of the method is validated experimentally, and its uncertainty is investigated. The contactless nature of the developed method makes it attractive for inline inspection of diffused layers in solar cell manufacturing.

发射极片电阻是影响扩散层硅太阳能电池效率的重要参数。该参数的传统测量方法要么需要电接触，要么会受到被测样品体电阻率的影响。本研究开发了一种基于涡流电导和光致发光成像相结合的新方法，用于非接触式测定发射极片电阻。利用数值模拟建立了光致发光轮廓与发射极和体电阻之和之间的相关性。结合涡流电导测量，可以将发射极片电阻和体电阻分开。实验验证了该方法的准确性，并对其不确定性进行了研究。所开发方法的非接触特性使其对太阳能电池制造中扩散层的在线检测具有吸引力。

引用次数: 0

Corrigendum to “AI-enabled design of extraordinary daytime radiative cooling materials” [Solar Energy Mater. Solar Cell. 278 (2024) 113177] 非凡日间辐射冷却材料的人工智能设计"[太阳能材料。太阳能电池。 278 (2024) 113177] 更正

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells

Pub Date : 2024-10-15 DOI: 10.1016/j.solmat.2024.113215

Quang-Tuyen Le , Sih-Wei Chang , Bo-Ying Chen , Huyen-Anh Phan , An-Cheng Yang , Fu-Hsiang Ko , Hsueh-Cheng Wang , Nan-Yow Chen , Hsuen-Li Chen , Dehui Wan , Yu-Chieh Lo

引用次数: 0

Effect of cell structures on electrical degradation of GaAs laser power convertors after 1 MeV electron irradiation and structure-optimization for improving radiation resistance 电池结构对 1 MeV 电子辐照后砷化镓激光功率转换器电性能下降的影响，以及为提高抗辐射能力而进行的结构优化

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells

Pub Date : 2024-10-14 DOI: 10.1016/j.solmat.2024.113206

Linfeng Shi , Chengyue Sun , Yong Liu , Yiyong Wu , Zhenlong Wu , Hongliang Guo , Ronghua Wan , Bao Zhang , Yubao Zhang

Laser wireless power transfer (LWPT) technology holds significant promise for wireless power transmission in space, necessitating that high-efficiency GaAs laser power convertors (LPCs) have strong tolerance to high-energy particle radiation. Therefore, the degradation characteristics of GaAs LPCs with different architectures under 1 MeV electron irradiation were investigated. Experimental and simulation results demonstrate that LPCs with thicker bottom cells suffer from significantly more electrical degradation. The degradation is primarily due to a reduction in electron concentrations in the base of the bottom cells, which is considerably less pronounced as the thickness of the bottom cells decreases. Based on these analyses, thinning the thickness and optimizing the doping profile for the bottom cells are proposed to improve the radiation resistance of the LPCs. Simulations show that the electrical degradation of the optimized four-junction LPCs is notably less than that of the original four-junction LPCs under the same irradiation conditions, indicating that the proposed strategies effectively enhance the radiation resistance of the LPCs.

激光无线电力传输（LWPT）技术在空间无线电力传输方面前景广阔，这就要求高效砷化镓激光功率转换器（LPC）对高能粒子辐射具有很强的耐受性。因此，我们研究了不同结构的砷化镓激光功率转换器在 1 MeV 电子辐照下的降解特性。实验和仿真结果表明，底部电池较厚的 LPC 的电学劣化程度明显更高。衰减的主要原因是底部电池基底中电子浓度的降低，而随着底部电池厚度的减小，电子浓度的降低也就不那么明显了。根据上述分析，建议减薄底部电池的厚度并优化掺杂曲线，以提高 LPC 的抗辐射能力。模拟结果表明，在相同的辐照条件下，优化后的四结 LPC 的电性能衰减明显小于原来的四结 LPC，这表明所提出的策略有效地提高了 LPC 的抗辐射能力。

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引用次数: 0

Investigating the effect of Cu underlayer and FTO etching towards photoelectrochemical performance enhancement of Cu2O photoelectrode 研究铜底层和 FTO 蚀刻对提高 Cu2O 光电极光电化学性能的影响

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells

Pub Date : 2024-10-14 DOI: 10.1016/j.solmat.2024.113208

Nur Azlina Adris , Lorna Jeffery Minggu , Khuzaimah Arifin , Rozan Mohamad Yunus , Mohamad Azuwa Mohamed , Mohammad B. Kassim

Cuprous oxide (Cu₂O) exhibits potential as a photoactive material for photoelectrochemical water splitting, owing to its appropriate bandgap, efficient charge carrier separation, and ability to enhance solar-driven hydrogen production. This study investigates the influence of substrate etching, Cu underlayer and Cu₂O electrodeposition time, and annealing time on enhancing the photoelectrochemical (PEC) performance. Electrodeposition and thermal oxidation techniques were used to fabricate the Cu₂O/Cu/FTOe-A photocathode. It has been observed that FTO etching improves adhesion, light transmission, and efficiency. A Cu underlayer also impacts the PEC performance, wherein an ideal thickness of Cu leads to enhanced PEC performance. This study also focuses on the annealing time that leads to CuO layers and nanowires forming on the Cu₂O surface. The structural and chemical changes before and after annealing are confirmed via XRD, XPS, AFM and FESEM analyses. UV–Vis analysis also reveals that the presence of Cu underlayer, FTO etching, and the annealing process affect the electrical properties and light absorption capacities of the Cu₂O photoelectrode. Electrochemical impedance analysis (EIS) and Mott-Schottky analysis have provided insights into the enhanced charge transfer properties and band bending in the Cu₂O/Cu/FTOe-A, resulting in enhanced PEC performance. Overall, this study provides significant insights into the understanding and enhancement of Cu₂O/Cu/FTOe-A photocathodes for potential use in PEC water splitting applications.

氧化亚铜（Cu2O）具有适当的带隙、高效的电荷载流子分离以及增强太阳能驱动的制氢能力，因此具有作为光电化学水分离的光活性材料的潜力。本研究探讨了基底蚀刻、铜底层和 Cu2O 电沉积时间以及退火时间对提高光电化学（PEC）性能的影响。利用电沉积和热氧化技术制造了 Cu2O/Cu/FTOe-A 阴极。据观察，FTO 蚀刻可提高附着力、透光率和效率。铜底层也会影响 PEC 性能，理想的铜厚度可提高 PEC 性能。本研究还重点关注了导致 Cu2O 表面形成氧化铜层和纳米线的退火时间。通过 XRD、XPS、AFM 和 FESEM 分析证实了退火前后的结构和化学变化。紫外可见光分析还显示，铜底层的存在、FTO 刻蚀和退火过程会影响 Cu2O 光电极的电学特性和光吸收能力。电化学阻抗分析 (EIS) 和 Mott-Schottky 分析深入揭示了 Cu2O/Cu/FTOe-A 中增强的电荷转移特性和带弯曲，从而提高了 PEC 性能。总之，这项研究为了解和提高 Cu2O/Cu/FTOe-A 光电阴极在 PEC 水分离应用中的潜在用途提供了重要见解。

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引用次数: 0

Enhanced photoelectrochemical CO2 reduction activity towards selective generation of alcohols over CuxO/SrTiO3 heterojunction photocathodes 在 CuxO/SrTiO3 异质结光电阴极上增强光电化学二氧化碳还原活性以选择性生成醇类

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells

Pub Date : 2024-10-14 DOI: 10.1016/j.solmat.2024.113203

Guguloth Venkanna , Sovan Kumar Patra , Gajanan U. Kapure , Kamal Kishore Pant

Photoelectrochemical reduction (PECR) of CO₂ to value-added chemicals and fuels will reduce the dependency on fossil fuels, also it will solve environmental issues that arise due to greenhouse gases. A heterojunction of Cu_xO/SrTiO₃ with varying post-annealing temperature ranges from 300 to 600 °C (CS300-600) was synthesized by overlying the spin-coated SrTiO₃ on electrodeposited Cu₂O over the FTO glass substrate. The synthesized photoelectrode's crystallinity and phase formation significantly varied by varying the post-annealing temperature, which was characterized via XRD and Raman spectroscopy. Optical, morphological, type of heterojunction formation and elemental surface oxidation states of photoelectrodes were studied through UV–visible DRS spectrum, FE-SEM, and XPS analysis respectively. Electrocatalytic analysis such as Linear Sweep Voltammetry (LSV), and Electrochemical Impedance Spectrometry (EIS) was employed, thus it conforms to the highest photocurrent density (−1.38 mA/cm² at −0.6V vs. Ag/AgCl), and low charge transfer resistance (R_CT=0.412 kΩ) at the electrode-electrolyte interfaces for CS500 photoelectrode as compared to others photoelectrodes. PECR of CO₂ to liquid product formation was evaluated by applying different potential ranges (0 to −0.6 V vs. Ag/AgCl). Highest methanol formation of 48.69 μmol.cm⁻²hr⁻¹, which is approximately 9 times enhanced as compared to the pure Cu₂O (5.62 μmol.cm⁻²hr⁻¹) photoelectrode at 0 V vs Ag/AgCl for CS500 heterojunction. Optimization of overlaying SrTiO₃ synthesis temperature for crystallization formation on Cu₂O and applied photoelectrode potential findings could pave the way for designing other new heterojunction types for selective liquid alcohol production.

将二氧化碳光电化学还原（PECR）为高附加值的化学品和燃料将减少对化石燃料的依赖，同时还能解决因温室气体而产生的环境问题。通过在 FTO 玻璃基底上的电沉积 Cu2O 上覆盖旋涂 SrTiO3，合成了退火后温度范围在 300 到 600 ℃ 之间的 CuxO/SrTiO3 异质结（CS300-600）。通过 XRD 和拉曼光谱对合成光电极的结晶度和相的形成进行了表征。通过紫外可见 DRS 光谱、FE-SEM 和 XPS 分析分别研究了光电极的光学、形态、异质结形成类型和元素表面氧化态。通过线性扫频伏安法（LSV）和电化学阻抗谱法（EIS）等电催化分析，与其他光电极相比，CS500 光电极具有最高的光电流密度（-0.6V 时-1.38 mA/cm2 对 Ag/AgCl）和电极-电解质界面上较低的电荷转移电阻（RCT=0.412 kΩ）。通过使用不同的电位范围（0 至 -0.6 V，相对于 Ag/AgCl）评估了二氧化碳到液体产物形成的 PECR。与纯 Cu2O（5.62 μmol.cm-2hr-1）光电电极相比，CS500 异质结在 0 V 对 Ag/AgCl 时的甲醇生成量最高，为 48.69 μmol.cm-2hr-1，提高了约 9 倍。优化在 Cu2O 上形成结晶的 SrTiO3 层叠合成温度和应用光电极电位的研究结果，可为设计其他新型异质结以选择性生产液体酒精铺平道路。

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引用次数: 0

Achieving optically selective coatings of silica fixated carbon nanotubes for solar energy applications 实现用于太阳能应用的二氧化硅固定碳纳米管光学选择性涂层

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells

Pub Date : 2024-10-12 DOI: 10.1016/j.solmat.2024.113202

Erik Zäll , Jonas Segervald , Hoda Mahmoodi , Dimitrios Perivoliotis , Ludvig Edman , Thomas Wågberg

Solar collectors have the potential for significant climate change mitigation by substituting heat produced with fossil fuels. To achieve this, collectors with highly efficient solar absorbers are essential. Carbon nanotubes are highly absorbing, sustainable, cheap, and thermally stable, making them a promising material for solar absorbers. However, achieving a high solar absorptance and low thermal emittance (solar selectivity), while maintaining good thermal stability and scalability is challenging. Here, we present a selective coating based on multi-walled carbon nanotubes and silica (SiO₂). A water-based dispersion enabled by carboxyl functionalization of the carbon nanotubes (CNT_F) is spray coated on a stainless steel (SS) substrate and fixated with sol-gel dip coated silica. The SS/CNT_F/SiO₂ surface exhibits an optical selectivity dependent on CNT_F area load and with 0.83 g_CNT m⁻² a solar absorptance and thermal emittance of 0.94 and 0.40, respectively, is achieved. The coating also demonstrates excellent thermal stability, with an estimated lifetime of >25 years at working temperatures ≤222°C. All together, we show that by using scalable and cheap technology, concurrent with sustainable materials and a simple structural design, we can manufacture a coating that exhibits properties suitable for low-to-mid-temperature applications. Our study highlights the potential of carbon-based solar absorbers.

太阳能集热器有可能替代化石燃料产生的热量，从而显著缓解气候变化。为实现这一目标，集热器必须配备高效的太阳能吸收器。碳纳米管具有高吸收率、可持续、廉价和热稳定性等特点，是一种很有前途的太阳能吸收材料。然而，在保持良好热稳定性和可扩展性的同时，实现高太阳能吸收率和低热辐射率（太阳能选择性）是一项挑战。在此，我们介绍一种基于多壁碳纳米管和二氧化硅（SiO2）的选择性涂层。通过对碳纳米管（CNTF）进行羧基官能化而得到的水基分散体被喷涂在不锈钢（SS）基底上，并用溶胶凝胶浸涂二氧化硅固定。SS/CNTF/SiO2 表面的光学选择性取决于 CNTF 的面积负载，在 0.83 gCNT m-2 的情况下，太阳能吸收率和热辐射率分别达到 0.94 和 0.40。该涂层还具有出色的热稳定性，在工作温度≤222°C的条件下，估计使用寿命可达 25 年。综上所述，我们表明，通过使用可扩展的廉价技术、可持续材料和简单的结构设计，我们可以制造出具有适合中低温应用特性的涂层。我们的研究凸显了碳基太阳能吸收器的潜力。

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引用次数: 0