▎ 摘　　要

NOVELTY - Preparing cerium oxide nanorod array/graphene composite material involves using conductive substrate as substrate, cerium salt solution as electrolyte, potassium chloride as auxiliary electrolyte and ammonium salt as stabilizer, and depositing by electrodeposition method at 50-90 degrees C and current density of 0.5-5.5 milliampere/cm2 for 80-160 minutes. The cerium oxide (CeO2) nanorod arrays are nucleated and grown on CeO2 seed layer, and does not need to remove substrate after deposition, directly proceed to next step. The graphene oxide (GO) is taken as raw material and tin chloride as ethanol solution as activator to activate CeO2 nanorod array. The tin ions are deposited on CeO2 nanorod array, immersed in GO aqueous solution, stirred at 50-90 degrees C for 0.5-3.5 hours, and passed tin ions to reduce GO to reduced graphene oxide (rGO). USE - Method for preparing cerium oxide nanorod array/graphene composite material used for photocathode protection (claimed). ADVANTAGE - The method enables to prepare cerium oxide nanorod array/graphene composite material that improves light absorption rate and anti-corrosion performance, promotes electrons and holes separation and directional transport efficiency of carriers under light, and combines physical barrier of sheet material with traditional photocathode anticorrosion. DETAILED DESCRIPTION - Preparing cerium oxide nanorod array/graphene composite material involves using conductive substrate as substrate, cerium salt solution as electrolyte, potassium chloride as auxiliary electrolyte and ammonium salt as stabilizer, and depositing by electrodeposition method at 50-90 degrees C and current density of 0.5-5.5 milliampere/cm2 for 80-160 minutes. The cerium oxide (CeO2) nanorod arrays are nucleated and grown on CeO2 seed layer, and does not need to remove substrate after deposition, directly proceed to next step. The graphene oxide (GO) is taken as raw material and tin chloride as ethanol solution as activator to activate CeO2 nanorod array. The tin ions are deposited on CeO2 nanorod array, immersed in GO aqueous solution, stirred at 50-90 degrees C for 0.5-3.5 hours, and passed tin ions to reduce GO to reduced graphene oxide (rGO). The tin ions and rGO are electrostatically adsorbed, so that CeO2 nanorod array is connected to graphene top sheet, washed with sodium sulfate and deionized water, and vacuum dried at 50-90 degrees C to obtain cerium oxide nanorod array/graphene composite material.