卡诺循环
材料科学
阳极
能量转换效率
阴极
聚苯胺
余热
氧化剂
石墨烯
化学工程
电极
光电子学
纳米技术
热力学
化学
复合材料
热交换器
聚合
物理
工程类
物理化学
有机化学
聚合物
作者
Xun Wang,Yu-Ting Huang,Chang Liu,Kaiyu Mu,Ka Ho Li,Sijia Wang,Yuan Yang,Lei Wang,Chia‐Hung Su,Shien‐Ping Feng
标识
DOI:10.1038/s41467-019-12144-2
摘要
Efficient low-grade heat recovery can help to reduce greenhouse gas emission as over 70% of primary energy input is wasted as heat, but current technologies to fulfill the heat-to-electricity conversion are still far from optimum. Here we report a direct thermal charging cell, using asymmetric electrodes of a graphene oxide/platinum nanoparticles cathode and a polyaniline anode in Fe2+/Fe3+ redox electrolyte via isothermal heating operation. When heated, the cell generates voltage via a temperature-induced pseudocapacitive effect of graphene oxide and a thermogalvanic effect of Fe2+/Fe3+, and then discharges continuously by oxidizing polyaniline and reducing Fe3+ under isothermal heating till Fe3+ depletion. The cell can be self-regenerated when cooled down. Direct thermal charging cells attain a temperature coefficient of 5.0 mV K-1 and heat-to-electricity conversion efficiency of 2.8% at 70 °C (21.4% of Carnot efficiency) and 3.52% at 90 °C (19.7% of Carnot efficiency), outperforming other thermoelectrochemical and thermoelectric systems.
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