The precise correlation of the Ordovician successions in different facies is difficult due to the complex changes of the tecto-paleogeography in South China.Based on previous studies,the authors recognized 103rd grade...The precise correlation of the Ordovician successions in different facies is difficult due to the complex changes of the tecto-paleogeography in South China.Based on previous studies,the authors recognized 103rd grade sequences,i.e.,Osq1 to Osq10 in ascending order,by the integrated study of chronostratigraphy,biostratigraphy as well as the analysis on the sedimentary facies.The authors are confident to correlate the Ordovician successions precisely in different facies in an isochronous stratigraphic framework with the application of the method of sequence stratigraphy and correlation.展开更多
Designing and creating molecular structures with precisely organized organic chromophores as donors and acceptors are critical for exploring photo-induced charge transfer properties.Donor and acceptor moieties can be ...Designing and creating molecular structures with precisely organized organic chromophores as donors and acceptors are critical for exploring photo-induced charge transfer properties.Donor and acceptor moieties can be incorporated to the confined skeletons of organic cages,thereby offering opportunities tomanipulate excited state characters for the development of novel photofunctional molecules.Herein,we present the convergent synthesis and photophysical characterizations of an organic cage with anisotropic skeleton.The strained and rigid cage can be concisely prepared by connecting two distinct macrocycles through axial stacking strategy,featuring triarylamine and amide moieties as separate donors and acceptors,respectively.Steady-state and time-resolved spectra reveal photo-induced through-space intramolecular charge transfer and long-lived charge separation,thereby verifying the cage’s photocatalytic utility for efficient hydrogen production.展开更多
Harvesting clean energy such as solar energy and salinity gradient energy directly from the surrounding environment has attracted great attention.A promising proof-of-concept combination of cation-selective membrane-b...Harvesting clean energy such as solar energy and salinity gradient energy directly from the surrounding environment has attracted great attention.A promising proof-of-concept combination of cation-selective membrane-based osmotic energy with photoelectrochemical-based solar energy has been developed,highlighting the great potential for the direct conversion of osmotic energy to hydrogen energy.With the help of a 50-fold concentration gradient,the MXene-CdSe quantum dots system exhibits the highest photocurrent enhancement ratio(Δ/_(L-H)/Δ/_(L-L)),and the hydrogen production is increased by about 33%at a bias of 0 V versus reversible hydrogen electrode.Directly converting osmotic energy and solar energy into hydrogen energy suggests the possibility of coupling osmotic energy with other renewable energy sources.展开更多
基金the Natural Science Foundation of China (41472031)the Gelogical Survey of China (121201009000172111, 121201009000150017)a contribution to the IGCP Project 591, The Early to Middle Paleozoic Revolution.
文摘The precise correlation of the Ordovician successions in different facies is difficult due to the complex changes of the tecto-paleogeography in South China.Based on previous studies,the authors recognized 103rd grade sequences,i.e.,Osq1 to Osq10 in ascending order,by the integrated study of chronostratigraphy,biostratigraphy as well as the analysis on the sedimentary facies.The authors are confident to correlate the Ordovician successions precisely in different facies in an isochronous stratigraphic framework with the application of the method of sequence stratigraphy and correlation.
基金supported by Beijing Natural Science Foundation(grant no.2234089)the National Natural Science Foundation of China(grant nos.92356307,21922113,22088102,21988102,and 22071257)+2 种基金the National Key Research and Development Program of China(grant no.2022YFA1207600)the Strategic Priority Research Program of Chinese Academy of Sciences(grant no.XDB33000000)TIPC Director’s Fund.
文摘Designing and creating molecular structures with precisely organized organic chromophores as donors and acceptors are critical for exploring photo-induced charge transfer properties.Donor and acceptor moieties can be incorporated to the confined skeletons of organic cages,thereby offering opportunities tomanipulate excited state characters for the development of novel photofunctional molecules.Herein,we present the convergent synthesis and photophysical characterizations of an organic cage with anisotropic skeleton.The strained and rigid cage can be concisely prepared by connecting two distinct macrocycles through axial stacking strategy,featuring triarylamine and amide moieties as separate donors and acceptors,respectively.Steady-state and time-resolved spectra reveal photo-induced through-space intramolecular charge transfer and long-lived charge separation,thereby verifying the cage’s photocatalytic utility for efficient hydrogen production.
基金supported by the National Key R&D Program of China(grant nos.2017YFA02-06900,2017YFA0206904,2017YFA0206903,and 2021YFA1500800)the National Natural Science Foundation of China(grant nos.21625303,22122207,21905287,21988102,22088102,and 21971251).
文摘Harvesting clean energy such as solar energy and salinity gradient energy directly from the surrounding environment has attracted great attention.A promising proof-of-concept combination of cation-selective membrane-based osmotic energy with photoelectrochemical-based solar energy has been developed,highlighting the great potential for the direct conversion of osmotic energy to hydrogen energy.With the help of a 50-fold concentration gradient,the MXene-CdSe quantum dots system exhibits the highest photocurrent enhancement ratio(Δ/_(L-H)/Δ/_(L-L)),and the hydrogen production is increased by about 33%at a bias of 0 V versus reversible hydrogen electrode.Directly converting osmotic energy and solar energy into hydrogen energy suggests the possibility of coupling osmotic energy with other renewable energy sources.
