Enhancing solar–thermal–electric energy conversion based on m-PEGMA/GO synergistic phase change aerogels,Journal of Materials Chemistry A

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Enhancing solar–thermal–electric energy conversion based on m-PEGMA/GO synergistic phase change aerogels
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-12 , DOI: 10.1039/d0ta04712k
Ruirui Cao _{1,

2,

3,

4,

5} , Dequan Sun _{4,

6,

7} , Liangliang Wang _{1,

2,

3,

4} , Zhengguang Yan _{1,

2,

3,

4} , Wenquan Liu _{1,

2,

3,

4} , Xin Wang _{1,

2,

3,

4} , Xingxiang Zhang _{4,

5,

8,

9,

10}

Affiliation

Thermoelectric power generation from solar radiation or waste heat has attracted tremendous attention due to strong global demand for cost-effective, pollution-free forms of energy conversion. However, the storage and sustainable release of thermal energy, as essential factors for thermoelectric generators (TEGs), remain great challenges. Herein, a TEG based on phase change aerogels (PCAs) has been fabricated to enhance the solar–thermal–electric energy conversion. The PCAs exhibit synergistic phase change properties, excellent thermal reliability, and shape-stabilized properties and can overcome the drawbacks of enthalpy degradation and leakage existing in the phase change materials (PCMs). Under the radiation of simulated solar light, the voltage and current output of the PCA-loaded TEG (∼144 mV, 14.8 mA) are approximately 3 times and 2.7 times that of a blank one (∼48 mV, 5.4 mA), respectively, and the thermal-to-electricity conversion maximum efficiency is enhanced by about 61.3% compared to that of the blank one. The sustained thermal release based on PCAs enables a sustainable electric output when solar light or the heat source is removed. In proof-of-concept experiments, the PCA-loaded TEGs can instantly light up commercial LEDs, drive various portable electronic gadgets, and charge several different capacitors. The sustainable lighting time of eighty green LEDs directly powered by PCA-loaded TEGs is about 4 times longer than that of the blank one. In particular, the maximum value of the voltage difference (ΔV) of LEDs powered by PCA-loaded TEGs and the blank one is up to 1.74 V. Therefore, the PCA-loaded TEGs have enhanced power supply capability when removing solar radiation or the heat source. This study expands the application of PCMs in TEGs and promises a new potential application in advanced energy-related devices and systems for solar energy utilization and storage, self-powered sensing systems, waste heat reuse and other fields.

中文翻译：

基于m-PEGMA / GO协同相变气凝胶增强太阳-热-电能转换

由于全球对具有成本效益，无污染形式的能量转换的强烈需求，利用太阳辐射或废热产生的热电已引起了极大的关注。但是，热能的存储和可持续释放作为热电发电机（TEG）的基本要素，仍然是巨大的挑战。在此，已经制造了基于相变气凝胶（PCA）的TEG，以增强太阳能-热能-电能的转换。PCA具有协同的相变特性，出色的热可靠性和形状稳定特性，并且可以克服相变材料（PCM）中存在的焓变和泄漏的缺点。在模拟太阳光的辐射下，PCA加载的TEG的电压和电流输出（约144 mV，14.8 mA）约为3倍和2。分别是空白板的7倍（〜48 mV，5.4 mA），与空白板相比，热电转换的最大效率提高了约61.3％。当去除太阳光或热源时，基于PCA的持续热释放可实现可持续的电力输出。在概念验证实验中，装有PCA的TEG可以立即点亮商用LED，驱动各种便携式电子设备，并为几个不同的电容器充电。由装有PCA的TEG直接供电的80个绿色LED的可持续照明时间是空白LED的可持续照明时间的约4倍。特别是电压差的最大值（Δ 相比空白的3％。当去除太阳光或热源时，基于PCA的持续热释放可实现可持续的电力输出。在概念验证实验中，装有PCA的TEG可以立即点亮商用LED，驱动各种便携式电子设备，并为几个不同的电容器充电。由装有PCA的TEG直接供电的80个绿色LED的可持续照明时间是空白LED的可持续照明时间的约4倍。特别是电压差的最大值（Δ 相比空白的3％。当去除太阳光或热源时，基于PCA的持续热释放可实现可持续的电力输出。在概念验证实验中，装有PCA的TEG可以立即点亮商用LED，驱动各种便携式电子设备，并为几个不同的电容器充电。由装有PCA的TEG直接供电的80个绿色LED的可持续照明时间是空白LED的可持续照明时间的约4倍。特别是电压差的最大值（Δ 由装有PCA的TEG直接供电的80个绿色LED的可持续照明时间是空白LED的可持续照明时间的约4倍。特别是电压差的最大值（Δ 由装有PCA的TEG直接供电的80个绿色LED的可持续照明时间是空白LED的可持续照明时间的约4倍。特别是电压差的最大值（Δ由装有PCA的TEG供电的LED的V）最高为空白，最高为1.74V。因此，在去除太阳辐射或热源时，装有PCA的TEG具有增强的供电能力。这项研究扩展了PCM在TEG中的应用，并有望在先进的与能源相关的设备和系统（太阳能利用和存储，自供电传感系统，废热再利用和其他领域）中获得新的潜在应用。

更新日期：2020-07-07

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