发展了基于超分子化学的新方法实现了对石墨炔的原位氮掺杂,通过利用石墨炔与有机共轭分子间强的π–π作用,原位制备了石墨炔/卟吩复合材料薄膜,并用作锂离子电池的负极材料,其比容量增加到了1000 m Ah·g^(-1),该复合材料表现出...发展了基于超分子化学的新方法实现了对石墨炔的原位氮掺杂,通过利用石墨炔与有机共轭分子间强的π–π作用,原位制备了石墨炔/卟吩复合材料薄膜,并用作锂离子电池的负极材料,其比容量增加到了1000 m Ah·g^(-1),该复合材料表现出优良的倍率性能和循环稳定性,为可控制备掺氮石墨炔复合材料提供了新的思路。展开更多
A straightforward protocol using readily available aromatic amines,N,N,N',N'-tetramethyl-p-phenylenediamine or N,N,N',N'-tetramethylbenzidine,as photocatalysts was developed for theefficient hydrodehal...A straightforward protocol using readily available aromatic amines,N,N,N',N'-tetramethyl-p-phenylenediamine or N,N,N',N'-tetramethylbenzidine,as photocatalysts was developed for theefficient hydrodehalogenation of organic halides,such as 4'-bromoacetophenone,polyfluoroarenes,cholorobenzene,and 2,2',4,4'-tetrabromodiphenyl ether(a resistant and persistent organic pollu-tant).The strongly reducing singlet excited states of the amines enabled diffusion-controlled disso-ciative electron transfer to effectively cleave carbon-halogen bonds,followed by radical hydrogena-tion.Diisopropylethylamine served as the terminal electron/proton donor and regenerated theamine sensitizers.展开更多
Oxidation of CO by gas-phase atomic clusters is being actively studied to understand the molecular-level mechanisms of heterogeneous CO oxidation over related catalytic surfaces. However, it is experimentally challeng...Oxidation of CO by gas-phase atomic clusters is being actively studied to understand the molecular-level mechanisms of heterogeneous CO oxidation over related catalytic surfaces. However, it is experimentally challenging to study CO oxidation by neutral heteronuclear metal oxide clusters because of the difficulty of cluster ionization and detection without fragmentation. Herein, the neutral AuVO2-4 clusters were experimentally generated and their reactions with CO and O2 were studied. The experimental results showed that CO adsorption is the dominant channel on the interactions of AuVO4 and AuVO3 with CO, and AuVO2 can pick up an O2 molecule to generate AuVO4. Theoretical studies indicated that the oxidation of the trapped CO in AuVO3,4CO into CO2 is exothermic while the reaction barriers have to be overcome at the elevated temperatures. A catalytic cycle for CO oxidation by AuVO2-4 is proposed.展开更多
文摘发展了基于超分子化学的新方法实现了对石墨炔的原位氮掺杂,通过利用石墨炔与有机共轭分子间强的π–π作用,原位制备了石墨炔/卟吩复合材料薄膜,并用作锂离子电池的负极材料,其比容量增加到了1000 m Ah·g^(-1),该复合材料表现出优良的倍率性能和循环稳定性,为可控制备掺氮石墨炔复合材料提供了新的思路。
基金supported by the National Natural Science Foundation of China(91645203,21773253)China Postdoctoral Science Foundation(2017M611002)+1 种基金Beijing Natural Science Foundation,China(2182092)Youth Innovation Promotion Association,Chinese Academy of Sciences(2018041)~~
文摘A straightforward protocol using readily available aromatic amines,N,N,N',N'-tetramethyl-p-phenylenediamine or N,N,N',N'-tetramethylbenzidine,as photocatalysts was developed for theefficient hydrodehalogenation of organic halides,such as 4'-bromoacetophenone,polyfluoroarenes,cholorobenzene,and 2,2',4,4'-tetrabromodiphenyl ether(a resistant and persistent organic pollu-tant).The strongly reducing singlet excited states of the amines enabled diffusion-controlled disso-ciative electron transfer to effectively cleave carbon-halogen bonds,followed by radical hydrogena-tion.Diisopropylethylamine served as the terminal electron/proton donor and regenerated theamine sensitizers.
基金supported by the National Natural Science Foundation of China(No.21773254,No.21773253,and No.21773073)the Youth Innovation Promotion Association,Chinese Academy of Sciences(No.2016030)the Beijing Natural Science Foundation(No.2172059)
文摘Oxidation of CO by gas-phase atomic clusters is being actively studied to understand the molecular-level mechanisms of heterogeneous CO oxidation over related catalytic surfaces. However, it is experimentally challenging to study CO oxidation by neutral heteronuclear metal oxide clusters because of the difficulty of cluster ionization and detection without fragmentation. Herein, the neutral AuVO2-4 clusters were experimentally generated and their reactions with CO and O2 were studied. The experimental results showed that CO adsorption is the dominant channel on the interactions of AuVO4 and AuVO3 with CO, and AuVO2 can pick up an O2 molecule to generate AuVO4. Theoretical studies indicated that the oxidation of the trapped CO in AuVO3,4CO into CO2 is exothermic while the reaction barriers have to be overcome at the elevated temperatures. A catalytic cycle for CO oxidation by AuVO2-4 is proposed.
