This paper proposes and validates a comprehensive model of consumer acceptance in the context of offline e-cash payment.It modifies the unified theory of acceptance and the use of technology model(UTAUT)with construct...This paper proposes and validates a comprehensive model of consumer acceptance in the context of offline e-cash payment.It modifies the unified theory of acceptance and the use of technology model(UTAUT)with constructs of perceived security,cost of use,and government policy.Data collected from 4428 questionnaires about users’attitudes toward e-cash is used to apply a structural equation model which,in turn,assesses the predictive model.The empirical results indicate that perceived security and cost of use are beneficial extensions to the traditional UTAUT model,and intention is a key antecedent to users’actual utilization of e-cash.In addition,the demographic moderators are found to have significant effects on the relations among the variables.These results are useful to e-cash development and significant to the issue of Digital Currency Electronic Payment.展开更多
Artificial ammonia synthesis using solar energy is of great significance as it can help narrow the gap to the zero-net emission target.However,the current photocatalytic activity is generally too low for mass producti...Artificial ammonia synthesis using solar energy is of great significance as it can help narrow the gap to the zero-net emission target.However,the current photocatalytic activity is generally too low for mass production.Herein,we report a novel bismuth bromide oxide(BiOBr)-Tetracyanoquinodimethane(TCNQ)photocatalyst prepared via a facile self-assembly method.Due to the well-match band structure of TCNQ and Bi OBr,the separation and transfer of photogenerated electron-hole pairs were significantly boosted.More importantly,the abundant delocalizedπelectrons of TCNQ,and the electron-withdrawing property of TNCQ made electrons efficiently accumulated on the catalysts,which can strengthen the adsorption and cleavage of nitrogen molecules.As a result,the photocatalytic activity increased significantly.The highest ammonia yield of the optimized sample reached 2.617 mg/(h gcat),which was 5.6-fold as that of pristine BiOBr and higher than the reported BiOBr-based photocatalysts.The isotope labeled^(15)N_(2)was used to confirm that the ammonia is formed form the fixation of N_(2).Meanwhile,the sample also had good stability.After 4-time usage,the photocatalysts still had about 81.8%as the fresh sample.The results of this work provide a new way for optimizing the electronic structure of photocatalysts to achieve highly efficient photochemical N_(2) reduction.展开更多
Based on ’Theoryof Electron Donating, Accepting and Exchanging’whichtheauthorpub lishedin 1989 ,thispaperexplainsin detailsaboutthesuperconductivityof metallicelements,metalliccompoundsand alloys. Italso providesa ...Based on ’Theoryof Electron Donating, Accepting and Exchanging’whichtheauthorpub lishedin 1989 ,thispaperexplainsin detailsaboutthesuperconductivityof metallicelements,metalliccompoundsand alloys. Italso providesa methodto raise Tc.展开更多
The ABAB-type 1,4,15,18-tetrapentyloxy-8,11,22,25-tetrachlorophthalocyaninato magnesium compound Mg(trans-TPTCPc)(1)was successfully isolated from the mixed cyclic tetramerization of 4,7-bis(pentyloxy)-1,3-diiminoisoi...The ABAB-type 1,4,15,18-tetrapentyloxy-8,11,22,25-tetrachlorophthalocyaninato magnesium compound Mg(trans-TPTCPc)(1)was successfully isolated from the mixed cyclic tetramerization of 4,7-bis(pentyloxy)-1,3-diiminoisoindoline as precursor A,actually the 1,3-diiminoisoindoline form of 3,6-bis(pentyloxy)-1,2-benzenedinitrile,and 4,5-dichlorophthalonitrile as precursor B in refluxing pentanol in the presence of magnesium pentoxide in a relatively good yield of 6.2%.Its molecular structure was clearly revealed on the basis of single crystal X-ray diffraction analysis,representing the first structurally characterized ABAB-type phthalocyanine compound,simultaneously bearing electron-donating pentyloxy groups and electron-accepting chloro substituents.Nevertheless,with 1 as the starting material,the corresponding sandwich-type bis(phthalocyaninato)lutetium double-decker complex Lu^(Ⅲ)(trans-TPTCPc)_(2)(2)was also prepared and structurally characterized,showing a high hyperpolarizability of 1240×10^(-30) esu as determined by harmonic light scattering(HLS),indicating the great potential of these kinds of phthalocyanine compounds in the field of second-order NLO materials.展开更多
The development of photocatalysts that utilize sunlight is very important for solving the energy crisis and reducing environmental pollution.In this report,two kinds of TiO_(2)/MoS_(2)cocatalyst with novel morphologie...The development of photocatalysts that utilize sunlight is very important for solving the energy crisis and reducing environmental pollution.In this report,two kinds of TiO_(2)/MoS_(2)cocatalyst with novel morphologies(hollow and yolk-shell structure)are prepared via a polymer assisted targeted-etching method.MoS_(2),as a typical two-dimensional(2D)layered transition metal sulfide,can accept electrons and provide active sites for photocatalytic reactions.Besides,with the assistance of MoS_(2),the absorption band of the resultant heterostructures becomes broader and covers the entire visible region.Thus the photocatalytic activity of TiO_(2)in the visible light region can be improved.Moreover,the hollow and yolk-shell heterostructures of TiO_(2)/MoS_(2)possess a high specific surface area,and the excellent interface of the heterostructures enables the easy separation of holes and electrons,which can enhance the photodegradation of dye.The results demonstrate that the as-prepared TiO_(2)/MoS_(2)nanocomposites with hollow and yolk-shell structures show outstanding catalytic activity which is tested through the degradation of methylene blue and rhodamine B under visible light.Our design provides a new strategy to acquire novel photocatalysts,with various nanostructures,that have remarkable potential applications in environmental protection,e.g.water treatment and dye pollutant degradation.展开更多
基金supported by grants from the Key Program of the Ministry of Education of Humanities and Social Science(No.15JJD790046)。
文摘This paper proposes and validates a comprehensive model of consumer acceptance in the context of offline e-cash payment.It modifies the unified theory of acceptance and the use of technology model(UTAUT)with constructs of perceived security,cost of use,and government policy.Data collected from 4428 questionnaires about users’attitudes toward e-cash is used to apply a structural equation model which,in turn,assesses the predictive model.The empirical results indicate that perceived security and cost of use are beneficial extensions to the traditional UTAUT model,and intention is a key antecedent to users’actual utilization of e-cash.In addition,the demographic moderators are found to have significant effects on the relations among the variables.These results are useful to e-cash development and significant to the issue of Digital Currency Electronic Payment.
基金supported by an Australian Research Council(ARC)Future Fellowship(FT160100195)the support from National Natural Science Foundation of China(21607034)+3 种基金Beijing Natural Science Foundation(8192011)Science and Technology General Project of Beijing Municipal Education Commission(KM202010016006)the Pyramid Talent Training Project of Beijing University of Civil Engineering and Architecture(JDYC20200313)the support of Key Talent Project of Gansu Province。
文摘Artificial ammonia synthesis using solar energy is of great significance as it can help narrow the gap to the zero-net emission target.However,the current photocatalytic activity is generally too low for mass production.Herein,we report a novel bismuth bromide oxide(BiOBr)-Tetracyanoquinodimethane(TCNQ)photocatalyst prepared via a facile self-assembly method.Due to the well-match band structure of TCNQ and Bi OBr,the separation and transfer of photogenerated electron-hole pairs were significantly boosted.More importantly,the abundant delocalizedπelectrons of TCNQ,and the electron-withdrawing property of TNCQ made electrons efficiently accumulated on the catalysts,which can strengthen the adsorption and cleavage of nitrogen molecules.As a result,the photocatalytic activity increased significantly.The highest ammonia yield of the optimized sample reached 2.617 mg/(h gcat),which was 5.6-fold as that of pristine BiOBr and higher than the reported BiOBr-based photocatalysts.The isotope labeled^(15)N_(2)was used to confirm that the ammonia is formed form the fixation of N_(2).Meanwhile,the sample also had good stability.After 4-time usage,the photocatalysts still had about 81.8%as the fresh sample.The results of this work provide a new way for optimizing the electronic structure of photocatalysts to achieve highly efficient photochemical N_(2) reduction.
基金the National Key Basic Research Program of China(Grant No.2013CB933402)the National Natural Science Foundation of China(Grant No.21290174,21301017,and 21401009)the Beijing Municipal Commission of Education is gratefully acknowledged.
文摘The ABAB-type 1,4,15,18-tetrapentyloxy-8,11,22,25-tetrachlorophthalocyaninato magnesium compound Mg(trans-TPTCPc)(1)was successfully isolated from the mixed cyclic tetramerization of 4,7-bis(pentyloxy)-1,3-diiminoisoindoline as precursor A,actually the 1,3-diiminoisoindoline form of 3,6-bis(pentyloxy)-1,2-benzenedinitrile,and 4,5-dichlorophthalonitrile as precursor B in refluxing pentanol in the presence of magnesium pentoxide in a relatively good yield of 6.2%.Its molecular structure was clearly revealed on the basis of single crystal X-ray diffraction analysis,representing the first structurally characterized ABAB-type phthalocyanine compound,simultaneously bearing electron-donating pentyloxy groups and electron-accepting chloro substituents.Nevertheless,with 1 as the starting material,the corresponding sandwich-type bis(phthalocyaninato)lutetium double-decker complex Lu^(Ⅲ)(trans-TPTCPc)_(2)(2)was also prepared and structurally characterized,showing a high hyperpolarizability of 1240×10^(-30) esu as determined by harmonic light scattering(HLS),indicating the great potential of these kinds of phthalocyanine compounds in the field of second-order NLO materials.
基金supported by the National Natural Science Foundation of China(no.51503085)open project of state key laboratory of supramolecular structure and materials(sklssm201724)Science Foundation of China University of Petroleum,Beijing(no.2462017YJRC027).
文摘The development of photocatalysts that utilize sunlight is very important for solving the energy crisis and reducing environmental pollution.In this report,two kinds of TiO_(2)/MoS_(2)cocatalyst with novel morphologies(hollow and yolk-shell structure)are prepared via a polymer assisted targeted-etching method.MoS_(2),as a typical two-dimensional(2D)layered transition metal sulfide,can accept electrons and provide active sites for photocatalytic reactions.Besides,with the assistance of MoS_(2),the absorption band of the resultant heterostructures becomes broader and covers the entire visible region.Thus the photocatalytic activity of TiO_(2)in the visible light region can be improved.Moreover,the hollow and yolk-shell heterostructures of TiO_(2)/MoS_(2)possess a high specific surface area,and the excellent interface of the heterostructures enables the easy separation of holes and electrons,which can enhance the photodegradation of dye.The results demonstrate that the as-prepared TiO_(2)/MoS_(2)nanocomposites with hollow and yolk-shell structures show outstanding catalytic activity which is tested through the degradation of methylene blue and rhodamine B under visible light.Our design provides a new strategy to acquire novel photocatalysts,with various nanostructures,that have remarkable potential applications in environmental protection,e.g.water treatment and dye pollutant degradation.
