Heterojunction has been widely used in vibration-driven piezocatalysis for enhanced charges separation,while the weak interfaces seriously affect the efficiency during mechanical deformations due to prepared by tradit...Heterojunction has been widely used in vibration-driven piezocatalysis for enhanced charges separation,while the weak interfaces seriously affect the efficiency during mechanical deformations due to prepared by traditional step-by-step methods.Herein,the intimate contact interfaces with shared S atoms are ingeniously constructed in SnS_(2)/SnS anchored on porous carbon by effective interface engineering,which is in-situ derived from temperature-dependent self-transformation of SnS_(2).Benefiting from intimate contact interfaces,the piezoelectricity is remarkably improved due to the larger interfacial dipole moment caused by uneven distribution of charges.Importantly,vibration-induced piezoelectric polarization field strengthens the interfacial electric field to further promote the separation and migration of charges.The dynamic charges then transfer in porous carbon with high conductivity and adsorption for significantly improved piezocatalytic activity.The degradation efficiency of bisphenol A(BPA)is 6.3 times higher than SnS_(2) and H_(2) evolution rate is increased by 3.8 times.Compared with SnS_(2)/SnS prepared by two-step solvothermal method,the degradation efficiency of BPA and H2 evolution activity are increased by 3 and 2 times,respectively.It provides a theoretical guidance for developing various multiphase structural piezocatalyst with strong interface interactions to improve the piezocatalytic efficiency.展开更多
Covalent organic frameworks(COFs)are promising materials for converting solar energy into green hydrogen.However,limited charge separation and transport in COFs impede their application in the photocatalytic hydrogen ...Covalent organic frameworks(COFs)are promising materials for converting solar energy into green hydrogen.However,limited charge separation and transport in COFs impede their application in the photocatalytic hydrogen evolution reaction(HER).In this study,the intrinsically tunable internal bond electric field(IBEF)at the imine bonds of COFs was manipulated to cooperate with the internal molecular electric field(IMEF)induced by the donor-acceptor(D-A)structure for an efficient HER.The aligned orientation of IBEF and IMEF resulted in a remarkable H_(2) evolution rate of 57.3 mmol·g^(-1)·h^(-1)on TNCA,which was approximately 520 times higher than that of TCNA(0.11 mmol·g^(-1)·h^(-1))with the opposing electric field orientation.The superposition of the dual electric fields enables the IBEF to function as an accelerating field for electron transfer,kinetically facilitat-ing the migration of photogenerated electrons from D to A.Furthermore,theoretical calculations indicate that the inhomogeneous charge distribution at the C and N atoms in TNCA not only pro-vides a strong driving force for carrier transfer but also effectively hinders the return of free elec-trons to the valence band,improving the utilization of photoelectrons.This strategy of fabricating dual electric fields in COFs offers a novel approach to designing photocatalysts for clean energy synthesis.展开更多
Objectives:The motives that lead to nurses’workplace silence behaviour are essential to understand,as the failure to voice their concerns and maintain silence may cause various adverse outcomes,including burnout,turn...Objectives:The motives that lead to nurses’workplace silence behaviour are essential to understand,as the failure to voice their concerns and maintain silence may cause various adverse outcomes,including burnout,turnover,job dissatisfaction,low productivity,and mental and moral distress.This study aimed to identify the level and influencing motives of the workplace silence behaviour among nurses at the National Guard Hospital in Madinah.Methods:A descriptive cross-sectional survey was conducted in January and February 2023.The participants completed a questionnaire with two parts:the sociodemographic data form and the Workplace Silence Behavior Nursing Motives Scale.Data analysis was performed by descriptive statistics and the chi-square test.Results:The overall level for all workplace silence behavior motives is moderate(3.29±0.69),with Avoidance Motives dimension receiving the highest scores(3.62±0.75)and Organization-Oriented Motives dimension receiving the lowest(3.15±0.86).Chi-square test showed that Saudi nationality(X^(2)=0.015,P=0.019)and monthly income(X^(2)=0.045,P?0.013)are factors in high-moderate levels of silence behaviour.Conclusions:The overall level of workplace silence behaviour motives was found to be moderate,nurses have higher monthly salaries and non-Saudi nationals tend to have higher levels of workplace silence behaviour motives.The study results provide a reference for nursing managers to pay attention to nurses’workplace silence behavior and take corresponding intervention measures.展开更多
文摘Heterojunction has been widely used in vibration-driven piezocatalysis for enhanced charges separation,while the weak interfaces seriously affect the efficiency during mechanical deformations due to prepared by traditional step-by-step methods.Herein,the intimate contact interfaces with shared S atoms are ingeniously constructed in SnS_(2)/SnS anchored on porous carbon by effective interface engineering,which is in-situ derived from temperature-dependent self-transformation of SnS_(2).Benefiting from intimate contact interfaces,the piezoelectricity is remarkably improved due to the larger interfacial dipole moment caused by uneven distribution of charges.Importantly,vibration-induced piezoelectric polarization field strengthens the interfacial electric field to further promote the separation and migration of charges.The dynamic charges then transfer in porous carbon with high conductivity and adsorption for significantly improved piezocatalytic activity.The degradation efficiency of bisphenol A(BPA)is 6.3 times higher than SnS_(2) and H_(2) evolution rate is increased by 3.8 times.Compared with SnS_(2)/SnS prepared by two-step solvothermal method,the degradation efficiency of BPA and H2 evolution activity are increased by 3 and 2 times,respectively.It provides a theoretical guidance for developing various multiphase structural piezocatalyst with strong interface interactions to improve the piezocatalytic efficiency.
文摘Covalent organic frameworks(COFs)are promising materials for converting solar energy into green hydrogen.However,limited charge separation and transport in COFs impede their application in the photocatalytic hydrogen evolution reaction(HER).In this study,the intrinsically tunable internal bond electric field(IBEF)at the imine bonds of COFs was manipulated to cooperate with the internal molecular electric field(IMEF)induced by the donor-acceptor(D-A)structure for an efficient HER.The aligned orientation of IBEF and IMEF resulted in a remarkable H_(2) evolution rate of 57.3 mmol·g^(-1)·h^(-1)on TNCA,which was approximately 520 times higher than that of TCNA(0.11 mmol·g^(-1)·h^(-1))with the opposing electric field orientation.The superposition of the dual electric fields enables the IBEF to function as an accelerating field for electron transfer,kinetically facilitat-ing the migration of photogenerated electrons from D to A.Furthermore,theoretical calculations indicate that the inhomogeneous charge distribution at the C and N atoms in TNCA not only pro-vides a strong driving force for carrier transfer but also effectively hinders the return of free elec-trons to the valence band,improving the utilization of photoelectrons.This strategy of fabricating dual electric fields in COFs offers a novel approach to designing photocatalysts for clean energy synthesis.
文摘Objectives:The motives that lead to nurses’workplace silence behaviour are essential to understand,as the failure to voice their concerns and maintain silence may cause various adverse outcomes,including burnout,turnover,job dissatisfaction,low productivity,and mental and moral distress.This study aimed to identify the level and influencing motives of the workplace silence behaviour among nurses at the National Guard Hospital in Madinah.Methods:A descriptive cross-sectional survey was conducted in January and February 2023.The participants completed a questionnaire with two parts:the sociodemographic data form and the Workplace Silence Behavior Nursing Motives Scale.Data analysis was performed by descriptive statistics and the chi-square test.Results:The overall level for all workplace silence behavior motives is moderate(3.29±0.69),with Avoidance Motives dimension receiving the highest scores(3.62±0.75)and Organization-Oriented Motives dimension receiving the lowest(3.15±0.86).Chi-square test showed that Saudi nationality(X^(2)=0.015,P=0.019)and monthly income(X^(2)=0.045,P?0.013)are factors in high-moderate levels of silence behaviour.Conclusions:The overall level of workplace silence behaviour motives was found to be moderate,nurses have higher monthly salaries and non-Saudi nationals tend to have higher levels of workplace silence behaviour motives.The study results provide a reference for nursing managers to pay attention to nurses’workplace silence behavior and take corresponding intervention measures.
