A strong pyro-catalytic dye degradation with an ultrahigh degradation efficiency (>99%) in hydrothermally synthesized pyroelectric BiFeO3 nanoparticles was achieved under a room-temperature cold-hot alternating excitation (between 27 °C to 38 °C). The pyro-catalysis originated from a combination of the pyroelectric effect and the electrochemical oxidation-reduction reaction. The intermediate products (hydroxyl radicals and superoxide radicals) of pyro-electro-catalysis were observed. Pyro-catalysis provides a highly efficient and reusable dye wastewater decomposition technology through utilizing environmental day-night temperature variation.

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The up-conversion optical emission temperature sensing of Er[Formula: see text]-doped (Ba[Formula: see text]Ca[Formula: see text])(Sn[Formula: see text]Ti[Formula: see text])O3 piezoelectric ceramic prepared via a conventional solid-state reaction method has been investigated in a range of 83–503[Formula: see text]K. There is a good linear relationship between the logarithm of the fluorescence intensity ratio of the green up-conversion emissions at 525[Formula: see text]nm and 550[Formula: see text]nm peaks (Ln([Formula: see text]/[Formula: see text])) and the inverse of temperature (1/[Formula: see text]). The maximum temperature sensitivity was found to be approximately 0.0051[Formula: see text]k[Formula: see text], suggesting that Er[Formula: see text]-doped (Ba[Formula: see text]Ca[Formula: see text])(Sn[Formula: see text]Ti[Formula: see text])O3 ceramic possesses potential application in optical non-contact temperature sensing.