Single-atomic site catalysts have drawn considerable attention because of their maximum atom-utilization efficiency and excellent catalytic activity.In this work,a highly active single-atomic Pt site photocatalyst was...Single-atomic site catalysts have drawn considerable attention because of their maximum atom-utilization efficiency and excellent catalytic activity.In this work,a highly active single-atomic Pt site photocatalyst was synthesized through employing defective Ti0_(2) nanosheets as solid support for photo-catalytic water splitting.It indicated that the surface oxygen vacancies on defective Ti0_(2) nanosheets could effectively stabilize the single-atomic Pt sites through constructing a three-center Ti-Pt-Ti structure.The Ti-Pt-Ti structure can hold the stability of isolated single-atomic Pt sites and facilitate the separation and transfer of photoinduced charge carriers,thereby greatly improving the photocatalytic H2 evolution.Notably,our synthesized photocatalyst exhibited a remarkably enhanced H2 evolution performance,and the H2 production rate is up to 13460.7μmol h^(-1)·g^(-1),which is up to around 29.0 and 4.7 times higher than those of Ti0_(2) nanosheets and Pt nanoparticles-Ti0_(2).In addition,a plausible enhanced reaction mechanism was also proposed combining with photo-electrochemical characterizations and density functional theoiy(DFT)calculation results.Ultimately,it is believed that this work highlights the benefits of a single-site catalyst and paves the way to rationally design the highly active and stable single-atomic site photocatalysts on metal oxide support.展开更多
通过静电纺丝制备了定向排列的0.5(Ba_(0.7)Ca_(0.3))TiO_3-0.5Ba(Zr_(0.2)Ti_(0.8))O_3(BCZT)纳米线,并利用纳米线制备了纳米发电机。研究了定向排列纳米线对纳米发电机输出性能的影响。X射线粉末衍射谱和拉曼光谱显示:制备的纳米线具...通过静电纺丝制备了定向排列的0.5(Ba_(0.7)Ca_(0.3))TiO_3-0.5Ba(Zr_(0.2)Ti_(0.8))O_3(BCZT)纳米线,并利用纳米线制备了纳米发电机。研究了定向排列纳米线对纳米发电机输出性能的影响。X射线粉末衍射谱和拉曼光谱显示:制备的纳米线具有良好的四方相钙钛矿结构。扫描电子显微镜照片显示,利用平行电极收集器可以实现大部分纳米线的定向排列。测试了纳米发电机的压电性能,结果显示:基于定向排列纳米线的纳米发电机平均输出电流为89.69 n A,而基于无序排列纳米线的纳米发电机平均输出电流为52.36 n A。相比而言,发电机的电流输出性能提升了71.3%。利用发电机制备的自供电式可穿戴肢体动作传感器响应非常好,能在不需要外部电源的情况下很好地区分不同肢体部位的弯曲动作。展开更多
基金This research was funded by the Canadian Centre for Clean Coal/Carbon and Mineral Processing Technologies(C5MPT),the National Key R&D Program of China(2017YFB0310803)and the China Scholarship Council(CSC).We thank the NanoFAB at the University of Alberta for the convenience of instruments use,and the kindly help of Nanqi Duan and Chao Qi on sample characterization.
文摘Single-atomic site catalysts have drawn considerable attention because of their maximum atom-utilization efficiency and excellent catalytic activity.In this work,a highly active single-atomic Pt site photocatalyst was synthesized through employing defective Ti0_(2) nanosheets as solid support for photo-catalytic water splitting.It indicated that the surface oxygen vacancies on defective Ti0_(2) nanosheets could effectively stabilize the single-atomic Pt sites through constructing a three-center Ti-Pt-Ti structure.The Ti-Pt-Ti structure can hold the stability of isolated single-atomic Pt sites and facilitate the separation and transfer of photoinduced charge carriers,thereby greatly improving the photocatalytic H2 evolution.Notably,our synthesized photocatalyst exhibited a remarkably enhanced H2 evolution performance,and the H2 production rate is up to 13460.7μmol h^(-1)·g^(-1),which is up to around 29.0 and 4.7 times higher than those of Ti0_(2) nanosheets and Pt nanoparticles-Ti0_(2).In addition,a plausible enhanced reaction mechanism was also proposed combining with photo-electrochemical characterizations and density functional theoiy(DFT)calculation results.Ultimately,it is believed that this work highlights the benefits of a single-site catalyst and paves the way to rationally design the highly active and stable single-atomic site photocatalysts on metal oxide support.
文摘通过静电纺丝制备了定向排列的0.5(Ba_(0.7)Ca_(0.3))TiO_3-0.5Ba(Zr_(0.2)Ti_(0.8))O_3(BCZT)纳米线,并利用纳米线制备了纳米发电机。研究了定向排列纳米线对纳米发电机输出性能的影响。X射线粉末衍射谱和拉曼光谱显示:制备的纳米线具有良好的四方相钙钛矿结构。扫描电子显微镜照片显示,利用平行电极收集器可以实现大部分纳米线的定向排列。测试了纳米发电机的压电性能,结果显示:基于定向排列纳米线的纳米发电机平均输出电流为89.69 n A,而基于无序排列纳米线的纳米发电机平均输出电流为52.36 n A。相比而言,发电机的电流输出性能提升了71.3%。利用发电机制备的自供电式可穿戴肢体动作传感器响应非常好,能在不需要外部电源的情况下很好地区分不同肢体部位的弯曲动作。
