摘要
Abstract
Composite photocatalysts of La-MOF modified g-C3N5(CNL-LM2)were successfully prepared via molten salt method and in situ solvothermal synthesis.The crystal structure,morphology and photoelectrochemical properties of the CNL-LM2 samples were characterized by XRD,TEM,SEM,FT-IR,XPS,PL,EIS,etc.,and their performance in the photocatalytic hydrogen evolution was investigated under visible light.The results show that the introduction of La-MOF in CNL-LM2 constructs an efficient directional electron transfer pathway,significantly suppressing the radiative recombination of photogenerated electrons and holes and enhancing visible light utilization.In comparison with pristine g-C3N5,CNL-LM2 with smaller particle size and increased porosity is provided with more active sites and reaction interfaces,collectively achieving excellent photocatalytic performance in the water splitting for hydrogen evolution.In particular,CNL-LM2 displays an excellent visible hydrogen evolution rate of 20.489 mmol/(g h),which is 5.8 times of that for the pristine g-C3N5,with an apparent quantum yield of 6.08％(λ=420 nm).This present work provides a unique idea for the study of rare-earth metal-organic framework modified metal-free hydrogen evolution photocatalysts.关键词
光催化/g-C3N5/La-MOF/水分解制氢/高效光电子迁移Key words
photocatalytic/g-C3N5/La-MOF/hydrogen evolution from water splitting/efficient photoelectron migration分类
能源科技
