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.

Pyro-catalytic hydrogen evolution, as an environmental-friendly, energy-saving and simple process, is demonstrated.

The nonradiative recombination of electrons and holes has been identified as the main cause of energy loss in hybrid organic-inorganic perovskite solar cells (PSCs). Sufficient built-in field and defect passivation can facilitate effective separation of electron-hole pairs to address the crucial issues. Fort he first time,w ei ntroduce ah omochiral molecular ferroelectric into aP SC to enlarge the built-in electric field of the perovskite film, therebyf acilitating effective charge separation and transportation. As ac onsequence of similarities in ionic structure,t he molecular ferroelectric component of the PSC passivates the defects in the active perovskite layers, therebyi nducing an approximately eightfold enhancement in photoluminescence intensity and reducing electron trap-state density.The photovoltaic molecular ferroelectric PSCs achieve apower conversion efficiency as high as 21.78 %.

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