期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
聚合物单原子光催化剂的载流子分离和表面反应机制 被引量:1
1
作者 滕镇远 张启涛 苏陈良 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2022年第9期17-28,共12页
近10年来,研究者制备了大量的单原子催化剂(SACs),其在光、电、热等催化体系中展现出优异的催化性能及较高的实用性和经济性.光催化过程的独特性使其在催化本质上明显不同于热催化和电催化过程,即处于激发态的电子和空穴参与反应,而非... 近10年来,研究者制备了大量的单原子催化剂(SACs),其在光、电、热等催化体系中展现出优异的催化性能及较高的实用性和经济性.光催化过程的独特性使其在催化本质上明显不同于热催化和电催化过程,即处于激发态的电子和空穴参与反应,而非基态的价电子.本文首先探讨了有机聚合半导体与传统无机金属化合物半导体的区别,指出聚合物半导体介电常数通常较小且光生电子与空穴的中心距离过短(计算上通常<1 nm),导致其界面处几乎不存在明显的能带弯曲.将金属离子引入聚合物半导体的骨架中可以有效引入给体-受体对,在提高载流子分离效率的同时延长其寿命.在高效聚合物基单原子光催化剂的设计过程中,引入单原子金属位点后的激发态电荷分布及捕获态电子对反应的驱动力是决定催化剂整体性能的关键因素.时间-空间双因子布局分析法和瞬态吸收光谱可为研究者提供相关信息.随着人工智能的进一步发展,建立回归精度接近或达到密度泛函理论水准的能量函数,从而反推激发态下体系的能量变化,有望为光催化反应的激发特性与反应活性建立可靠的联系.此外,配体和溶剂化效应在今后的研究中也应被仔细考虑. 展开更多
关键词 聚合物 单原子催化剂 光催化 介电性质
下载PDF
Carrier Dynamics and Surface Reaction Boosted by Polymer-based Single-atom Photocatalysts 被引量:1
2
作者 teng zhenyuan YANG Hongbin +1 位作者 ZHANG Qitao OHNO Teruhisa 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2022年第5期1207-1218,共12页
Carrier dynamics and surface reaction are two critical processes for determining the performance of photocatalytic reaction.Highly designable polymer-based photocatalysts have shown promising protectives in energetic ... Carrier dynamics and surface reaction are two critical processes for determining the performance of photocatalytic reaction.Highly designable polymer-based photocatalysts have shown promising protectives in energetic and environmental applications.In this prospective,we first distinguished the differences of physiochemical properties between polymer-based semiconductors and traditional inorganic semiconductors.Then,the effects of single-atom sites on the charge dynamics and reaction kinetics of polymer-based photocatalysts are further elaborated.Time(excitation)-space(wavefunction)population analysis,which can provide relevant information to clarify the structure-excitation relationships after introducing the single atom sites was also reviewed.In the future,with the further development of artificial intelligence,the establishment of an energy function with a regression accuracy close to or reaching the level of density functional theory is highly desired to infer the energetic diagram of the photocatalytic systems at the excited states.Furthermore,coordination structures,interaction with inorganic semiconductors,photocatalytic stability and solvent effects should also be carefully considered in the future studies of polymer-based photocatalyst. 展开更多
关键词 Carrier dynamics Surface reaction POLYMER Single-atom catalyst Dielectric property
原文传递
TiO_(2)-supported Single-atom Catalysts:Synthesis,Structure,and Application
3
作者 LIU Zailun SUN Like +3 位作者 ZHANG Qitao teng zhenyuan SUN Hongli SU Chenliang 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2022年第5期1123-1138,共16页
In recent years,single-atom catalysts(SACs)have attracted increasing attention in catalysis.However,their stability is considerably challenging.As a result,fine-tuning the interaction of metal single atoms(SA)with dif... In recent years,single-atom catalysts(SACs)have attracted increasing attention in catalysis.However,their stability is considerably challenging.As a result,fine-tuning the interaction of metal single atoms(SA)with different types of supports has emerged as an effective strategy for improving their thermal and chemical stabilities.Owing to its non-toxicity,cost-effectiveness,high abundance,and excellent stability,as well as presence of rich,tunable,and reliable anchor sites for metal SA,TiO_(2)has been extensively explored as a superior support for SACs.In this review,recent advances of TiO_(2)-supported SACs(M1/TiO_(2))are discussed,and synthetic strategies,structure elucidation,and catalytic applications are summarized.First,the recently developed synthetic strategies for M1/TiO_(2)arehighlighted and summarized,identifying the major challenges for the precise fabrication of M1/TiO_(2).Subsequently,key characterization techniques for the structure identification of M1/TiO_(2)are discussed.Next,catalytic applications of M1/TiO_(2)are highlighted,viz.photocatalysis,electrocatalysis,and thermocatalysis.In addition,the mechanism via geometric structures and electronic states of metal centers facilitate catalytic reactions is outlined.Finally,opportunities and challenges of M1/TiO_(2)in catalysis are discussed,which may inspire the future development of M1/TiO_(2)for multifunctional catalytic applications. 展开更多
关键词 Single-atom catalyst TiO_(2)support Synthetic strategy Characterization Catalytic application
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部