Abstract
Flexible thermoelectric materials are presented with potential applications in electronic devices and energy conversion due to their convenient preparation, good flexibility, and various forms. However, as ductility is rarely observed in inorganic semiconductors and ceramic insulators, reports on applications of inorganic oxide materials in flexible thermoelectric materials are sparse. Here, we report a new method for the synthesis of a flexible Na 1.4 Co 2 O 4 thermoelectric material based on Na 1.4 Co 2 O 4 bulk materials, which are prepared by a self-flux method and painted on print paper. Seebeck coefficient and power factor of the obtained thermoelectric material are 78–102 μVK -1 and 159–223 μWm −1 K −2 , respectively, in a temperature range of 303–522 K, which are superior to those values of other conductive polymers and their compounds. More interestingly, the n-type Na 1.4 Co 2 O 4 flexible material is obtained in the painting process at higher pressure with Seebeck coefficients of −109 to −183 μVK −1 in a temperature range of 303–522 K. The convenient preparation method of these novel flexible thermoelectric materials may be expanded to the synthesis of other flexible thermoelectric materials, which will be the focus of future work. • A flexible Na 1.4 Co 2 O 4 thermoelectric material was obtained by novel method. • High thermoelectric performance was achieved in the flexible Na 1.4 Co 2 O 4 . • The n-type Na x Co 2 O 4 flexible thermoelectric material is first discovered.
Published Version
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