Fluorinated amorphous carbon films were deposited using microwave electron cyclotron resonance chemical vapor deposition (ECR-CVD) reactor with CF4 and C8H6 as source gas and were annealed in nitrogen ambience for the...Fluorinated amorphous carbon films were deposited using microwave electron cyclotron resonance chemical vapor deposition (ECR-CVD) reactor with CF4 and C8H6 as source gas and were annealed in nitrogen ambience for the investigating of their thermal stability .The relative concentration of C=C bond and optical bandgap were obtained by Fourier Transform Infrared (FTIR) spectroscopy and Ultraviolet-Visible (UV-VIS ) spectrum, respectively. It has been demonstrated that there is a close relationship between relative concentration of C=C bond and optical bandgap, and the films deposited at a higher microwave power have a lower optical bandgap and a better thermal stability.展开更多
A comprehensive understanding of the dynamic processes at the catalyst/electrolyte interfaces is crucial for the development of advanced electrocatalysts for the oxygen evolution reaction(OER).However,the chemical pro...A comprehensive understanding of the dynamic processes at the catalyst/electrolyte interfaces is crucial for the development of advanced electrocatalysts for the oxygen evolution reaction(OER).However,the chemical processes related to surface corrosion and catalyst degradation have not been well understood so far.In this study,we employ LiCoO_(2) as a model catalyst and observe distinct OER activities and surface stabilities in different alkaline solutions.Operando X-ray diffraction(XRD)and online mass spectroscopy(OMS)measurements prove the selective intercalation of alkali cations into the layered structure of LiCoO_(2) during OER.It is proposed that the dynamic cation intercalations facilitate the chemical oxidation process between highly oxidative Co species and adsorbed water molecules,triggering the so-called electrochemical-chemical reaction mechanism(EC-mechanism).The results of this study emphasize the influence of cations on OER and provide insights into new strategies for achieving both high activity and stability in high-performance OER catalysts.展开更多
The longstanding notion that Pt_((IV))complexes are inert under physiological conditions where there are limited reducing agents is facing a great challenge.Herein,we systematically investigated the hydrolytic stabili...The longstanding notion that Pt_((IV))complexes are inert under physiological conditions where there are limited reducing agents is facing a great challenge.Herein,we systematically investigated the hydrolytic stability of a wide range of unsymmetric Pt_((IV))anticancer prodrugs built upon clinical Pt_((II))drugs.The detailed structure-stability relationship shows that the hydrolytic stability of one certain axial ligand in Pt_((IV))complexes can be dramatically affected by the other five ligands;both the coordination environment of equatorial ligands and the“trans influence”from one axial ligand affect the hydrolytic stability of the counter axial ligand,and the more electronegative axial ligand faces the higher possibility to detach.Inspiringly,this newly discovered structure-stability relationship has been successfully applied to improve the hydrolytic stability of Pt_((IV))complexes that contain axial dichloroacetato ligands.Our discovery represents a significant advancement in the theory of the chemical inertness of Pt_((IV))complexes toward ligand exchange reactions and provides a practical guide for the future design of Pt_((IV))anticancer prodrugs.展开更多
Insightful theorems are established on interrelationships among coalition and noncooperative stability concepts defined within the paradigm of the Graph Model for Conflict Resolution. More specifically, the newly defi...Insightful theorems are established on interrelationships among coalition and noncooperative stability concepts defined within the paradigm of the Graph Model for Conflict Resolution. More specifically, the newly defined coalition stability def＇mitions that are considered are coalition Nash stability （CNash）, coalition general metarationality （CGMR）, coalition symmetric metarationality （CSMR） and coalition sequential stability （CSEQ）, along with their earlier-defined noncooperative versions. A range of interesting new theorems are derived to establish connections among these coalition stability concepts as well as between noncooperative and coalition stability definitions. Applications with respect to the games of Prisoner＇s Dilemma and Chicken, as well as a groundwater contamination dispute, demonstrate how the various stability definitions can be applied in practice and confirm the validity of some of the theorems as well as point out, by example, certain types of relationships which cannot hold.展开更多
文摘Fluorinated amorphous carbon films were deposited using microwave electron cyclotron resonance chemical vapor deposition (ECR-CVD) reactor with CF4 and C8H6 as source gas and were annealed in nitrogen ambience for the investigating of their thermal stability .The relative concentration of C=C bond and optical bandgap were obtained by Fourier Transform Infrared (FTIR) spectroscopy and Ultraviolet-Visible (UV-VIS ) spectrum, respectively. It has been demonstrated that there is a close relationship between relative concentration of C=C bond and optical bandgap, and the films deposited at a higher microwave power have a lower optical bandgap and a better thermal stability.
基金financially supported by the Shenzhen Science and Technology Innovation Program(Grant No.JCYJ20220530150011024)。
文摘A comprehensive understanding of the dynamic processes at the catalyst/electrolyte interfaces is crucial for the development of advanced electrocatalysts for the oxygen evolution reaction(OER).However,the chemical processes related to surface corrosion and catalyst degradation have not been well understood so far.In this study,we employ LiCoO_(2) as a model catalyst and observe distinct OER activities and surface stabilities in different alkaline solutions.Operando X-ray diffraction(XRD)and online mass spectroscopy(OMS)measurements prove the selective intercalation of alkali cations into the layered structure of LiCoO_(2) during OER.It is proposed that the dynamic cation intercalations facilitate the chemical oxidation process between highly oxidative Co species and adsorbed water molecules,triggering the so-called electrochemical-chemical reaction mechanism(EC-mechanism).The results of this study emphasize the influence of cations on OER and provide insights into new strategies for achieving both high activity and stability in high-performance OER catalysts.
基金the Hong Kong Research Grants Council(Grant No.CityU 11307419,11304318,and 11303320)the National Natural Science Foundation of China(Grant No.21877092 and 22077108)for funding support.
文摘The longstanding notion that Pt_((IV))complexes are inert under physiological conditions where there are limited reducing agents is facing a great challenge.Herein,we systematically investigated the hydrolytic stability of a wide range of unsymmetric Pt_((IV))anticancer prodrugs built upon clinical Pt_((II))drugs.The detailed structure-stability relationship shows that the hydrolytic stability of one certain axial ligand in Pt_((IV))complexes can be dramatically affected by the other five ligands;both the coordination environment of equatorial ligands and the“trans influence”from one axial ligand affect the hydrolytic stability of the counter axial ligand,and the more electronegative axial ligand faces the higher possibility to detach.Inspiringly,this newly discovered structure-stability relationship has been successfully applied to improve the hydrolytic stability of Pt_((IV))complexes that contain axial dichloroacetato ligands.Our discovery represents a significant advancement in the theory of the chemical inertness of Pt_((IV))complexes toward ligand exchange reactions and provides a practical guide for the future design of Pt_((IV))anticancer prodrugs.
文摘Insightful theorems are established on interrelationships among coalition and noncooperative stability concepts defined within the paradigm of the Graph Model for Conflict Resolution. More specifically, the newly defined coalition stability def＇mitions that are considered are coalition Nash stability （CNash）, coalition general metarationality （CGMR）, coalition symmetric metarationality （CSMR） and coalition sequential stability （CSEQ）, along with their earlier-defined noncooperative versions. A range of interesting new theorems are derived to establish connections among these coalition stability concepts as well as between noncooperative and coalition stability definitions. Applications with respect to the games of Prisoner＇s Dilemma and Chicken, as well as a groundwater contamination dispute, demonstrate how the various stability definitions can be applied in practice and confirm the validity of some of the theorems as well as point out, by example, certain types of relationships which cannot hold.
