Piezo‐Photocatalytically Induced Dual‐Channel Pathway of Cd_xZn_1‐xS Solid‐Solution Nanorods for Hydrogen Peroxide Evolution

Abstract As a class of clean oxidants, the hydrogen peroxide (H₂O₂) has shown great application potential in a variety of fields due to its high energy density and convenient storage condition, while the synthesis of H₂O₂ by the utilization of green energy technology has currently become one of the attentions in energy field. In this paper, the Cd_xZn_1‐xS (x = 0, 0.2, 0.4, 0.6, 0.8, 1) solid solutions with different zinc‐cadmium molar ratios are prepared by a simple solvothermal route, and the H₂O₂ evolution performances of materials under illumination and ultrasound conditions are explored. The results show that Cd_0.4Zn_0.6S has the highest H₂O₂ yield rate of 2866 µmol/g/h under the synergistic effect of ultrasound and illumination without any sacrificial agent, which is higher than those in ultrasonic or light condition alone, showing piezo‐photocatalytic coupling characteristic. The characterizations including piezoresponse force microscopy (PFM), finite element simulation, in situ electron spin resonance (ESR) reveal that the excellent H₂O₂ production property of the material should be mainly ascribed to its nanorod structure and e⁻‐h⁺ dual‐channel reactivity formed by the bending of its energy band under the piezoelectric effect. This work provides reference and enlightenment for the preparation of H₂O₂ through the green energy avenue.