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The electrical properties of high-entropy ceramics (HECs) have been extensively studied in recent years due to their unique structural characteristics and fascinating functional properties induced by entropy engineering. Novel high-entropy (Sm0.2Eu0.2Gd0.2Ho0.2Yb0.2)CrO3(HE-RECrO3) nanofibers were prepared by electrospinning. This work demonstrates that HE-RECrO3nanofibers were successfully synthesized at a low temperature (800 °C), which is approximately 400 °C lower than the temperatures at which chromate ceramics were synthesized via the sol–gel method and the solid-state reaction method. The resistivity of HE-RECrO3nanofibers decreases exponentially with increasing temperature from 25 to 600 °C. The logarithm of the resistivity is linearly related to the inverse of the temperature, confirming the negative temperature coefficient property of HE-RECrO3nanofibers. The B25/50value of the HE-RECrO3nanofibers reaches 4072 K. In conclusion, HE-RECrO3nanofibers are expected to be potential candidates for negative-temperature-coefficient (NTC) thermistors.

In this work, a novel Sc-doped Bi3TiNbO9ferroelectric nanofiber was first prepared by electrospinning. The nanofibers are approximately 100 nm level in diameter. The photocatalytic activity analysis reveals that the Bi3TiNbO9nanofibers synthesized by electrospinning are superior to powders prepared by the solid-state method, which is mainly attributed to the higher specific surface area and higher surface activity of the nanofibers. In addition, Sc doping can reduce the band gap of Bi3TiNbO9 and further improve the photocatalytic efficiency. Bi3TiNbO9nanofibers containing 5mol% Sc hasthe highest photocatalytic activity, which can degrade 98.55% of RhB under 405 nm light irradiation for 120 min. In addition, the catalytic mechanism of the catalyst was obtained by scavenger tests, active species capture tests and band structure analyses. After three cycles of photocatalytic experiment, the degradation rate decreased by only 2.42%, proved that the nanofibers catalyst has excellent stability. This work provides good prospects for the practical application of electrospinning technology in the field of photocatalysis.