Efficient and stable photocathodes with versatility are of significance in photoassisted lithium-ion batteries(PLIBs),while there is always a request on fast carrier transport in electrochemical active photocathodes.P...Efficient and stable photocathodes with versatility are of significance in photoassisted lithium-ion batteries(PLIBs),while there is always a request on fast carrier transport in electrochemical active photocathodes.Present work proposes a general approach of creating bulk heterojunction to boost the carrier mobility of photocathodes by simply laser assisted embedding of plasmonic nanocrystals.When employed in PLIBs,it was found effective for synchronously enhanced photocharge separation and transport in light charging process.Additionally,experimental photon spectroscopy,finite difference time domain method simulation and theoretical analyses demonstrate that the improved carrier dynamics are driven by the plasmonic-induced hot electron injection from metal to TiO_(2),as well as the enhanced conductivity in TiO2 matrix due to the formation of oxygen vacancies after Schottky contact.Benefiting from these merits,several benchmark values in performance of TiO2-based photocathode applied in PLIBs are set,including the capacity of 276 mAh g^(−1) at 0.2 A g^(−1) under illumination,photoconversion efficiency of 1.276%at 3 A g^(−1),less capacity and Columbic efficiency loss even through 200 cycles.These results exemplify the potential of the bulk heterojunction strategy in developing highly efficient and stable photoassisted energy storage systems.展开更多
Methoxycarbonylation was performed on 1-heptene, 1-octene and 1-dodecene with Co(acac)(2) catalyst in the presence of UV light under ambient conditions.
in absence of light, the reaction kinetics of Mn(II) and Fe(III)-atalyzed oxidation ofS(IV) in unbuffered and buffered solutions were studied. An activation energy of 77.4kJ . mol￣(-1) forthe Mn(II)catalyzed oxidatio...in absence of light, the reaction kinetics of Mn(II) and Fe(III)-atalyzed oxidation ofS(IV) in unbuffered and buffered solutions were studied. An activation energy of 77.4kJ . mol￣(-1) forthe Mn(II)catalyzed oxidation of S(IV) is obtained. On the basis of the investigation of thecatalytic effects of Mn(II) and Fe(III) on the oxidation of S(IV), it has been elucidated that thecatalytic activity of Mn(II) is greater than that of Fet(III), and that Mn(II) and Fe(III) do not havea significant synergic effect on the catalytic oxidation of S (IV). The catalytic oxidation andautooxidation of S(IV) in unbuffered solution was also explored in the presence of light. The resultsshow that the reaction is first order with respect to S(IV) concentrations, the reaction rate increaseswith increasing light intensity and the concentrations of Fe(III) and Mn(II), and that the photoas-sisted catalytic activity of Fe(III) is greater than that of Mn(II).展开更多
The highly efficient degradation and purification of organic pollutants in wastewater by photocatalysis is still challenging.In this study,a piezoelectric potential-activated interfacial electric field(IEF)was constru...The highly efficient degradation and purification of organic pollutants in wastewater by photocatalysis is still challenging.In this study,a piezoelectric potential-activated interfacial electric field(IEF)was constructed to endow BiFeO_(3)@BaTiO_(3)(BFO@BTO)heterojunction with the ability to serve as a round-the-clock photocatalyst for polluted water remediation.BFO@BTO heterojunction is composed of BiFeO_(3)nanoparticles decorated on the surface of BaTiO_(3)nanorods,which shortens the carrier migration path.More importantly,the IEF can be activated and reconstructed under ultrasonic wave irradiation,leading to a lower potential barrier and enhanced separation efficiency for photogenerated carriers.The degradation rate constant k value of BFO@BTO heterojunction reached 0.038 min^(−1),which was 1.9 and 7.0 times greater than that of piezocatalysis and photocatalysis alone,respectively.It also exhibited excellent stability in three light‒dark cycles for high concentrations(25 mg·L^(−1))of rhodamine B(RhB)and tetracycline hydrochloride(TC).This study provides a promising strategy for designing highly active photoassisted piezocatalysts for environmental energy utilization and round-the-clock catalysis.展开更多
基金supported by the project of the National Natural Science Foundation of China(52202115 and 52172101)Guangdong Basic and Applied Basic Research Foundation(2024A1515012325)+2 种基金the Natural Science Foundation of Chongqing,China(CSTB2022NSCQ-MSX1085)the Shaanxi Science and Technology Innovation Team(2023-CXTD-44)the Fundamental Research Funds for the Central Universities(G2022KY0604).
文摘Efficient and stable photocathodes with versatility are of significance in photoassisted lithium-ion batteries(PLIBs),while there is always a request on fast carrier transport in electrochemical active photocathodes.Present work proposes a general approach of creating bulk heterojunction to boost the carrier mobility of photocathodes by simply laser assisted embedding of plasmonic nanocrystals.When employed in PLIBs,it was found effective for synchronously enhanced photocharge separation and transport in light charging process.Additionally,experimental photon spectroscopy,finite difference time domain method simulation and theoretical analyses demonstrate that the improved carrier dynamics are driven by the plasmonic-induced hot electron injection from metal to TiO_(2),as well as the enhanced conductivity in TiO2 matrix due to the formation of oxygen vacancies after Schottky contact.Benefiting from these merits,several benchmark values in performance of TiO2-based photocathode applied in PLIBs are set,including the capacity of 276 mAh g^(−1) at 0.2 A g^(−1) under illumination,photoconversion efficiency of 1.276%at 3 A g^(−1),less capacity and Columbic efficiency loss even through 200 cycles.These results exemplify the potential of the bulk heterojunction strategy in developing highly efficient and stable photoassisted energy storage systems.
文摘Methoxycarbonylation was performed on 1-heptene, 1-octene and 1-dodecene with Co(acac)(2) catalyst in the presence of UV light under ambient conditions.
文摘in absence of light, the reaction kinetics of Mn(II) and Fe(III)-atalyzed oxidation ofS(IV) in unbuffered and buffered solutions were studied. An activation energy of 77.4kJ . mol￣(-1) forthe Mn(II)catalyzed oxidation of S(IV) is obtained. On the basis of the investigation of thecatalytic effects of Mn(II) and Fe(III) on the oxidation of S(IV), it has been elucidated that thecatalytic activity of Mn(II) is greater than that of Fet(III), and that Mn(II) and Fe(III) do not havea significant synergic effect on the catalytic oxidation of S (IV). The catalytic oxidation andautooxidation of S(IV) in unbuffered solution was also explored in the presence of light. The resultsshow that the reaction is first order with respect to S(IV) concentrations, the reaction rate increaseswith increasing light intensity and the concentrations of Fe(III) and Mn(II), and that the photoas-sisted catalytic activity of Fe(III) is greater than that of Mn(II).
基金supported by the National Natural Science Foundation of China(Nos.52173094 and U21A2054)the Natural Science Foundation of Guangxi Province(No.2019GXNSFFA245010)l the Scientific and Technological Plan of Guilin City(No.20220110-1).
文摘The highly efficient degradation and purification of organic pollutants in wastewater by photocatalysis is still challenging.In this study,a piezoelectric potential-activated interfacial electric field(IEF)was constructed to endow BiFeO_(3)@BaTiO_(3)(BFO@BTO)heterojunction with the ability to serve as a round-the-clock photocatalyst for polluted water remediation.BFO@BTO heterojunction is composed of BiFeO_(3)nanoparticles decorated on the surface of BaTiO_(3)nanorods,which shortens the carrier migration path.More importantly,the IEF can be activated and reconstructed under ultrasonic wave irradiation,leading to a lower potential barrier and enhanced separation efficiency for photogenerated carriers.The degradation rate constant k value of BFO@BTO heterojunction reached 0.038 min^(−1),which was 1.9 and 7.0 times greater than that of piezocatalysis and photocatalysis alone,respectively.It also exhibited excellent stability in three light‒dark cycles for high concentrations(25 mg·L^(−1))of rhodamine B(RhB)and tetracycline hydrochloride(TC).This study provides a promising strategy for designing highly active photoassisted piezocatalysts for environmental energy utilization and round-the-clock catalysis.
