摘要：Photocatalytic hydrogen production coupled with selective oxidation of organic substrates to produce highvalue-added fine chemicals has drawn increasing ***,we report a noble metal-free photocatalyst for the highly efficient and simultaneous generation of hydrogen and the selective oxidation of benzyl alcohol into benzaldehyde over Cd S@Mo S2 heterostructures under visible *** the need for a sacrificial agent,Cd S@Mo S2 displayed an excellent hydrogen production rate of 4233μmol g^-1h^-1with0.3 mmol benzyl alcohol,which is approximately 53 times higher than that of bare Cd S nanorods(80μmol g^-1h^-1).The reaction system was highly selective for the oxidation of benzyl alcohol into *** the amount of benzyl alcohol increased to 1.0 mmol,the hydrogen production reached9033μmol g^-1h^-*** electron microscopy and transmission electron microscopy images revealed that p-type Mo S2 sheets with a flower-like structure closely adhered to n-type semiconductor Cd S nanorods through the formation of a p-n *** a potential Z-scheme photocatalyst,the Cd S@Mo S2 heterostructure effectively produces and separates electron-hole pairs under visible ***,the electrons are used for reduction to generate hydrogen,and the holes oxidize benzyl alcohol into ***,a mechanism of photogenerated charge transfer and separation was proposed and verified by photoluminescence,electrochemical impedance spectroscopy,photocurrent and Mott-Schottky *** results reveal that the Cd S@Mo S2 heterojunctions have rapid and efficient charge separation and transfer,thereby greatly improving benzyl alcohol *** work provides insight into the rational design of high-performance Z-scheme photocatalysts and the use of holes and electrons to obtain two valuable chemicals simultaneously.

摘要：超长有机室温磷光材料(UORTP)由于其独特的长寿命、丰富的激发态等优点,在成像、防伪、信息加密等领域受到了越来越多的关注.具有UORTP的聚合物材料则因其可加工性、透明度和柔韧性等特性渐渐走入人们的视野.本工作利用苯二甲酸衍生物作为磷光体,通过酰胺键将苯二甲酸分子修饰在聚乙烯亚胺分子链上,合成了一系列具有超长有机室温磷光性能的聚合物.密度泛函理论(DFT)计算证明苯二甲酸和聚乙烯亚胺之间存在能量转移效应,阐释了长寿命磷光的产生途径.同时,通过调控磷光小分子的含量,这些聚合物可获得达1.51s的超长寿命和6s可见余辉.这是因为随着磷光分子含量的增加,逐渐增强的分子内氢键构建的刚性环境限制了其非辐射跃迁.基于材料磷光强度随温度变化的特性,进一步开发了其在温度传感领域的应用.这项工作为设计具有长寿命室温磷光和可调余辉的智能发光聚合物提供了一种新的方法.

摘要：催化剂与助催化剂之间的低电荷分离效率严重限制了光催化性能.催化剂与助催化剂之间的强界面相互作用可以提高电荷分离效率.通过引入界面化学键增强组分间的界面相互作用是提高光催化性能的有效手段之一.本文合成了ZnIn_(2)S_(4)(ZIS)/Sv-MoS_(2)光催化剂,ZIS中的S原子与Sv-MoS_(2)中未配位Mo原子之间的键合作用形成了界面Mo–S键,这极大地提高了ZIS的光催化活性.采用不同的NaBH4蚀刻时间制备了MoS_(2-x)h.优化后的Z I S/MoS_(2)-4 h复合材料的产氢速率为7.6 mmol g^(−1)h^(−1),是原ZIS(1.6 mmol g^(−1)h^(−1))的4.75倍,是ZIS/MoS_(2)(3.7 mmol g^(−1)h^(−1))的2.05倍.非凡的光催化活性可归因于光生电子在Mo–S键的作用下更容易从ZIS转移到MoS_(2).光电测量表明,ZIS/MoS_(2)-4h具有有效的电荷转移.本工作揭示了引入界面化学键对ZIS/MoS_(2)光催化活性的影响,为通过界面工程设计优良的助催化剂提供了一种简单有效的方法.