Hydrogen Generation of Cu₂O Nanoparticles/MnO–MnO₂ Nanorods Heterojunction Supported on Sonochemical-Assisted Synthesized Few-Layer Graphene in Water-Splitting Photocathode

Abstract

In this study, we investigated the production of hydrogen by photochemical water splitting.Multi-shaped Cu 2 O nanoparticles / MnO-MnO 2 nanorod heterojunction on few-layer graphene-based electrode serves as the photocathode. Multi-shaped Cu 2 O nanoparticles, including truncated cubic shape, cuboctahedral shape, truncated octahedral shape, and octahedral shape, were then coated on square manganese nanorods on few-layer graphene-based electrode as the photosensitizer. Finally, the efficiency of hydrogen production was measured and recorded. Cu 2 O nanoparticles / MnO-MnO 2 nanorod heterojunction generates photoelectrons to reduce hydrogen ions into hydrogen gas. The manganese dioxide nanorods was combined with cuprous oxide multi-shaped nanoparticles to be simultaneously utilized in hydrogen production as a photochemical water splitting solar cell. The highest rate of hydrogen generation is 33.0 ml/min*m 2 under solar simulation radiation. This study highlights the significance of a back electron-hole recombination loss and transportation process on the surface of water splitting photocathode, retarding the appearance of the photocurrent and requiring a greater amount of energy from a solar device.

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