论文标题
本质上活化的SRTIO3：在没有任何贵金属coocatalyst的情况下，光催化H2从中性水溶液溶液中进化
Intrinsically Activated SrTiO3: Photocatalytic H2 Evolution from Neutral Aqueous Methanol Solution in the Absence of Any Noble Metal Cocatalyst
论文作者
论文摘要
贵金属co催化剂通常是基于氧化物 - 氧化物 - 氧化氢的光催化氢产生的关键因素。 In the present work, we show that optimized high-temperature hydrogenation of commercially available strontium titanate (SrTiO3) powder can be used to engineer an intrinsic cocatalytic shell around nanoparticles that can create a photocatalyst that is highly effective without the use of any additional cocatalyst for hydrogen generation from neutral aqueous methanol solutions.对于SRTIO3 [100]单晶以及NB掺杂的SRTIO3（100）单晶，也可以观察到这种固有的激活效果。对于所有类型的SRTIO3样品（纳米植物和任何一个单晶），在最佳条件下氢化会导致表面羟基化层与晶格缺陷以及透射电子显微镜，电子磁共振共振（EPR）（EPR）和光亮发光（PL）可见的晶格缺陷（PL）。活性样品在有缺陷的基质中提供状态 - 这与其他还原气氛中形成的无活性缺陷相反。在水性培养基中，活性SRTIO3样品显示平势的显着负变化（在光电化学和电容数据中）和光激发电子电子的较低电荷转移电阻。因此，我们将材料的显着无环化激活归因于热力学之间的协同作用（羟基化诱导的界面能量改变）和动力学（通过合适的TI3+状态的电荷传递调解）。
Noble metal cocatalysts are conventionally a crucial factor in oxide-semiconductor-based photocatalytic hydrogen generation. In the present work, we show that optimized high-temperature hydrogenation of commercially available strontium titanate (SrTiO3) powder can be used to engineer an intrinsic cocatalytic shell around nanoparticles that can create a photocatalyst that is highly effective without the use of any additional cocatalyst for hydrogen generation from neutral aqueous methanol solutions. This intrinsic activation effect can also be observed for SrTiO3[100] single crystal as well as Nb-doped SrTiO3 (100) single crystal. For all types of SrTiO3 samples (nanopowders and either of the single crystals), hydrogenation under optimum conditions leads to a surface-hydroxylated layer together with lattice defects visible by transmission electron microscopy, electron paramagnetic resonance (EPR), and photoluminescence (PL). Active samples provide states in a defective matrix -- this is in contrast to the inactive defects formed in other reductive atmospheres. In aqueous media, active SrTiO3 samples show a significant negative shift of the flatband potential (in photoelectrochemical as well as in capacitance data) and a lower charge-transfer resistance for photoexcited electrons. We therefore ascribe the remarkable cocatalyst-free activation of the material to a synergy between thermodynamics (altered interface energetics induced by hydroxylation) and kinetics (charge transfer mediation by suitable Ti3+ states).
