High CH4 selectivity for the photoreduction of CO2 of atmospheric concentration on CoAl-LDHs.

Efficient H2O2 production directly from water and oxygen via a piezo-catalytic process.

Oxygen reduction reaction (ORR) for generating H O through green pathways have gained much attention in recent years. Herein, we introduce a piezo-catalytic approach to obtain H O over bismuth oxychloride (BiOCl) through an ORR pathway. The piezoelectric response of BiOCl was directly characterized by piezoresponse force microscopy (PFM). The BiOCl exhibits efficient catalytic performance for generating H O (28 μmol h ) only from O and H O, which is above the average level of H O produced by solar-to-chemical processes. A piezo-catalytic mechanism was proposed: with ultrasonic waves, an alternating electric field will be generated over BiOCl, which can drive charge carriers (electrons) to interact with O and H O, then to form H O .