Solar Thermal Energy Storage Systems Based on Discotic Nematic Liquid Crystals That Can Efficiently Charge and Discharge below 0 °C,Advanced Energy Materials

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Solar Thermal Energy Storage Systems Based on Discotic Nematic Liquid Crystals That Can Efficiently Charge and Discharge below 0 °C
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2024-02-12 , DOI: 10.1002/aenm.202303845
Monika Gupta ₁ , Ashy ₁

Affiliation

Solid-state solar thermal fuels (SSTFs) serve as efficient means of storing solar energy as chemical potential energy in a closed loop system and releasing it as heat on-demand. An ideal SSTF requires photoswitchability in visible-region without any external heating as well as extended storage times. However, existing systems often rely on ultraviolet (UV) light or heating for photoswitching, or suffer from low storage times. Addressing this, a novel strategy is presented to obtain visible-light responsive SSTFs designed to operate effectively at room-temperature or sub-zero temperatures by innovatively integrating a tetra-ortho-fluoro/chloro azobenzene arm in triphenylene based liquid crystal (LC) moiety. The resulting compounds exhibit discotic nematic (N_D) mesophases till −6.5 °C. These compounds exhibit excellent photocyclability, photostability, and sufficient half-lives of cis states. Achieving up to 77% charging under sunlight with a bandpass filter and 62.4% without it, these systems uniquely demonstrate efficient chargeability and dischargeability at sub-zero temperatures. Upon discharging, temperature rise of up to 6.5 and 29.5 °C occur at room-temperature (25 °C) and sub-zero temperatures (around −6 to −7 °C), respectively. This efficacy is attributed to less-ordered N_D phases providing conformational freedom for photoisomerization at low temperatures.

中文翻译：

基于盘状向列液晶的太阳能热能存储系统可在0°C以下高效充电和放电

固态太阳能热燃料（SSTF）是将太阳能作为化学势能存储在闭环系统中并按需释放为热量的有效手段。理想的 SSTF 需要在可见光区域具有光切换能力，无需任何外部加热以及延长存储时间。然而，现有系统通常依赖紫外 (UV) 光或加热进行光开关，或者存储时间短。为了解决这个问题，提出了一种新的策略，通过创新地将四邻氟/氯偶氮苯臂集成到基于苯并菲的液晶（LC）部分中，获得可见光响应型SSTF，该SSTF旨在在室温或零度以下的温度下有效运行。所得化合物在-6.5°C 之前表现出盘状向列（N _D ）中间相。这些化合物表现出优异的光循环性、光稳定性和足够的顺式半衰期。这些系统在使用带通滤波器的情况下在阳光下可实现高达 77% 的充电率，而在没有带通滤波器的情况下可实现 62.4% 的充电率，这些系统在零度以下的温度下独特地展示了高效的充电能力和放电能力。放电时，室温（25°C）和零下温度（约-6至-7°C）下的温度分别上升高达6.5°C和29.5°C。这种功效归因于有序度较低的 N _D相为低温下的光异构化提供了构象自由度。

更新日期：2024-02-12

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