无机材料学报2023，Vol.38Issue(11)：1301-1308,8.DOI:10.15541/jim20230170
Pd纳米颗粒协同氧空位增强TiO2光催化CO2还原性能
Synergy Effect of Pd Nanoparticles and Oxygen Vacancies for Enhancing TiO2 Photocatalytic CO2 Reduction
摘要
Abstract
In this study,one-dimensional single-crystal TiO2 nanobelt arrays with surface oxygen vacancies were constructed by Pd-catalyzed oxygen reduction method in anoxic environment to address the problems of insufficient surface active sites and slow reaction kinetics of TiO2,low yield and poor selectivity of hydrocarbons in CO2 reduction products.The effects of surface oxygen vacancies and hydrogen spillover of Pd on the separation and transport of photogenerated carrier and the selectivity of reduction product were investigated from morphological structure,carrier behavior and photocatalytic performance.With high CO2 reduction activity of Pd-Ov-TNB,yields of CH4,C2H6 and C2H4 are 40.8,32.09 and 3.09 µmol·g-1·h-1,respectively,and selectivity of hydrocarbons is as high as 84.52%,showing great potential in C-C coupling.Its excellent photocatalytic activity is attributed to the one-dimensional single-crystal nanobelt structure that increases the active specific surface area and crystallinity of the material,provides more active sites for the CO2 reduction and accelerates the segregated transport of photogenerated charges.Meanwhile,the oxygen vacancies enhance the surface accumulation of photogenerated charges,providing an electron-rich environment for CO2 reduction.In addition,Pd nanoparticles increase concentration of H* in the reaction system,and then transfer H* to active sites of CO2 adsorption on the catalyst surface through the hydrogen spillover effect,promoting the hydrogenation of reaction intermediates.Comprehensive advantages of Pd-nanoparticals contribute to the efficient conversion of CO2 to hydrocarbons.关键词
氧空位/TiO2纳米带/氢溢流/光催化还原CO2Key words
oxygen vacancies/TiO2 nanobelt/hydrogen spillover/photocatalytic CO2 reduction分类
化学化工引用本文复制引用
贾鑫,李晋宇,丁世豪,申倩倩,贾虎生,薛晋波..Pd纳米颗粒协同氧空位增强TiO2光催化CO2还原性能[J].无机材料学报,2023,38(11):1301-1308,8.基金项目
国家自然科学基金(62004137,21878257,21978196) （62004137,21878257,21978196）
山西省自然科学基金(20210302123102) （20210302123102）
山西省重点研发计划项目(201803D421079) （201803D421079）
山西省高等学校科技创新项目(2019L0156) （2019L0156）
山西省回国留学人员科研资助项目(2020-050)National Natural Science Foundation of China(62004137,21878257,21978196) （2020-050）
Natural Science Foundation of Shanxi Province(20210302123102) （20210302123102）
Key Research and Development Program of Shanxi Province(201803D421079) （201803D421079）
Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(2019L0156) （2019L0156）
Research Project Supported by Shanxi Scholarship Council of China(2020-050) （2020-050）
