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Cheap, Large-Scale, and High-Performance Graphite-Based Flexible Thermoelectric Materials and Devices with Supernormal Industry Feasibility
journal contributionposted on 2022-02-07, 21:03 authored by Shuai Sun, Xiao-Lei Shi, Wei-Di Liu, Ting Wu, Dezhuang Wang, Hao Wu, Xiaoyong Zhang, Yu Wang, Qingfeng Liu, Zhi-Gang Chen
Flexible thermoelectric materials and devices show great potential to solve the energy crisis but still face great challenges of high cost, complex fabrication, and tedious postprocessing. Searching for abnormal thermoelectric materials with rapid and scale-up production can significantly accelerate their applications. Here, we develop superlarge 25 × 20 cm2 commercial graphite-produced composite films in batches, achieved by a standard 10 min industrial process. The high cost effectiveness (S2σ/cost) of 7250 μW g m–1 K–2 $–1 is absolutely ahead of that of the existing thermoelectric materials. The optimized composite film shows a high power factor of 94 μW m–1 K–2 at 150 °C, representing the optimal value of normal carbon materials so far. Furthermore, we design two types of flexible thermoelectric devices fabricated based on such a novel composite, which achieve an output open-circuit voltage of 3.70 mV using the human wrist as the heat source and 1.33 mV soaking in river water as the cold source. Our study provides distinguished inspiration to enrich flexible and cost-effective thermoelectric materials with industrial production.
normal carbon materialsexisting thermoelectric materialseffective thermoelectric materialsdesign two typesabnormal thermoelectric materials70 mv using33 mv soaking150 ° cproduced composite films7250 μw ghigh power factor2 supnovel composite94 μwtedious postprocessingsignificantly accelerateriver waterperformance graphiteoutput openoptimal valuehuman wristheat sourceenrich flexibleenergy crisiscomplex fabricationcommercial graphitecold sourcecircuit voltageabsolutely ahead>< sup