摘要：SummaryHydrogen can contribute significantly to the energy mix of the near future, as it is an attractive replacement for fossil fuels due to its high energy density and low greenhouse gas emission. A fascinating approach is to use the polarization change of a ferroelectric due to an applied stress or temperature change to achieve piezo- or pyro-catalysis for both H2generation and wastewater treatment. We exploit low Curie temperature (Tc) ferroelectrics for polarization-driven electrochemical reactions, where the large changes in polarization and high activity of a ferroelectric near itsTcprovides a novel avenue for such materials. We present experimental evidence for enhanced water splitting and rhodamine B degradation via piezo-catalysis by ultrasonic excitation at itsTc. Such work provides an effective strategy for water splitting/treatment systems that employ lowTcferroelectrics under the action of mechanical stress or/and thermal fluctuations.Graphical AbstractDisplay OmittedHighlights•First demonstration of the positive impact of operating nearTcfor piezo-catalysis•Ultrasound applied to achieve piezo-catalysis nearTc•High hydrogen production rate and degradation rate were achieved at theTc•Piezo-catalysis is a new avenue for lowTcand lead-free ferroelectricsCatalysis; Electrochemical Energy Production; Ceramics
