Abstract
WO3@ZnO core–shell nanoarrays with a Z-scheme heterojunction structure have been fabricated by combining electrodeposition and dropping process and used as photoanodes for the production of hydrogen peroxide (H2O2). The photocurrent density of the WO3@ZnO nanoarray photoanode is 1.57 mA∙cm−2 at the applied potential of 1.8 V vs reversible hydrogen electrode, which exhibits almost 4 time larger than that of pure ZnO nanoarray photoanode. A high photoconversion efficiency to the production of H2O2 (0.53%) and Faradic efficiency (33%) are also reached by this WO3@ZnO nanoarray photoanode under Air-Mass 1.5 Global (AM 1.5 G, 100 mW∙cm−2). This work provides an effective approach for the application of Z-scheme heterojunction in the photoelectrochemical synthesis of H2O2.
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials