A Structured Phase Change Material with Controllable Thermoconductive Highways Enables Unparalleled Electricity via Solar‐Thermal‐Electric Conversion
A Structured Phase Change Material with Controllable Thermoconductive Highways Enables Unparalleled Electricity via Solar‐Thermal‐Electric Conversion
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DOI：
10.1002/adfm.202109255
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发表时间：
2021-10
影响因子：
19
通讯作者：
Yongzheng Zhang;Kai Wu;Qiang Fu
中科院分区：
文献类型：
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作者：
Yongzheng Zhang;Kai Wu;Qiang Fu
基于塞贝克效应的基本原理，太阳能热电发电机(STEG)可以收集太阳能并将其转化为电能，是光伏技术的一种有前途的替代技术。相变材料(PCM)与STEG的组合进一步实现了稳定和持久的能量输出，尽管太阳辐射通量发生了变化。然而，STAG的广泛推广仍然受到其输出功率(<；50W m−2)限制的阻碍，这归因于相变材料中不理想的热管理。本文采用模压加工的方法，制作了一种具有典型的圆形截锥构型并嵌入聚苯并双恶唑纤维辐射晶型排列的巧妙的相变复合材料。有机纤维中的纤维晶体在充放电过程中提供了耐温的热通道，而它们的辐射晶型有利于可控的导热行为。这些结构特征使集中的热能能够有效地存储在PCM中，并最大限度地释放到热电系统中。在这种功能强大的STAG中，通过实际环境中的太阳能-热电转换，可以获得高达198.70 W m−2的创纪录功率密度，这一值可与一些商业光伏器件相媲美。这项工作为在STEG实时应用期间利用清洁太阳能提供持久和巨大的电力供应提供了机会。
A solar thermoelectric generator (STEG) that harvests solar energy and converts it into electricity based on the fundamentals of the Seebeck effect is a promising alternative to photovoltaic technologies. The combination of a phase change material (PCM) with STEG further enables stable and durable energy output despite the variations of solar radiation flux. However, the widespread promotion of STEG is still impeded by its restricted output electricity (<50 W m−2), attributed to the undesirable thermal management in PCMs. Herein, an ingenious phase change composite, with the typical conformation of circular truncated cone and embedded with the actinomorphic arrangement of polybenzobisoxazole fibers, is tailored by a mold processing strategy. The fibrous crystals in organic fibers offer temperature‐resistance thermal highways during the charging/discharging processes, while their actinomorphic configuration facilitates a controllable thermo‐conductive behavior. These structural features render concentrated thermal energy to be efficiently stored in the PCM and maximally discharged into the thermoelectric system. A record‐breaking power density as high as 198.70 W m−2 can be achieved in this powerful STEG via real‐environment solar‐thermal‐electric conversion, a value comparable to that of some commercial photovoltaic devices. This work opens up opportunities for durable and giant electricity supply from clean solar energy during real‐time STEG applications.