Electrocatalytic water splitting provides an efficient method for the production of hydrogen.In electrocatalytic water splitting,the oxygen evolution reaction(OER)involves a kinetically sluggish four-electron transfer...Electrocatalytic water splitting provides an efficient method for the production of hydrogen.In electrocatalytic water splitting,the oxygen evolution reaction(OER)involves a kinetically sluggish four-electron transfer process,which limits the efficiency of electrocatalytic water splitting.Therefore,it is urgent to develop highly active OER catalysts to accelerate reaction kinetics.Coupling single atoms and clusters in one system is an innovative approach for developing efficient catalysts that can synergistically optimize the adsorption and configuration of intermediates and improve catalytic activity.However,research in this area is still scarce.Herein,we constructed a heterogeneous single-atom cluster system by anchoring Ir single atoms and Co clusters on the surface of Ni(OH)_(2)nanosheets.Ir single atoms and Co clusters synergistically improved the catalytic activity toward the OER.Specifically,Co_(n)Ir_(1)/Ni(OH)_(2)required an overpotential of 255 mV at a current density of 10 mA·cm^(−2),which was 60 mV and 67 mV lower than those of Co_(n)/Ni(OH)_(2)and Ir1/Ni(OH)_(2),respectively.The turnover frequency of Co_(n)Ir_(1)/Ni(OH)_(2)was 0.49 s^(−1),which was 4.9 times greater than that of Co_(n)/Ni(OH)_(2)at an overpotential of 300 mV.展开更多
The present article reports a novel self‐standing nanostructured Au‐Cu(I)@Na2Ti6O13plasmonic photocatalytic membrane,which is prepared by a hydrothermal reaction followed by a simple subsequent heat treatment proces...The present article reports a novel self‐standing nanostructured Au‐Cu(I)@Na2Ti6O13plasmonic photocatalytic membrane,which is prepared by a hydrothermal reaction followed by a simple subsequent heat treatment process.The morphological structure,elemental composition,crystalline phases,and optical properties of the membrane were studied in detail by field‐emission scanning electron microscopy,transmission electron microscopy,X‐ray photoelectron spectroscopy,X‐ray diffraction,and ultraviolet‐visible spectroscopy.Compared with that of a pure Na2Ti6O13membrane,the Au‐Cu(I)@Na2Ti6O13membrane displayed much higher photocatalytic activity for the decomposition of acetaldehyde,a typical volatile organic compound,under visible light illumination.It was found that the photocatalytic activity of the Au‐Cu(I)@Na2Ti6O13membrane increased as the amount of Au was increased.The membrane loaded with2.85wt%Au showed the highest photocatalytic activity in the decomposition of acetaldehyde of the investigated materials.We found that in the photocatalyst membrane,Na2Ti6O13acted as a support material,Au displayed plasmonic absorption,and Cu(I)behaved as a co‐catalyst.The present membrane materials can avoid the self‐aggregation typically observed during the course of photocatalytic reactions.As a result,they can be easily separated,recycled,and reactivated after their practical application,making these functional materials attractive for use in air cleaning applications.展开更多
The biosynthesis of antibiotics is controlled by cascade regulation involving cluster-situated regulators (CSRs) and pleiotropic regulators. Three CSRs have been identified in the jadomycin biosynthetic gene cluster, ...The biosynthesis of antibiotics is controlled by cascade regulation involving cluster-situated regulators (CSRs) and pleiotropic regulators. Three CSRs have been identified in the jadomycin biosynthetic gene cluster, including one OmpR-type activator (JadR1) and two TetR-like repressors (JadR* and JadR2). To examine their interactions in jadomycin biosynthesis, a series of mutants were generated and tested for jadomycin production. We noticed that jadomycin production in the jadR*-jadR2 double mutant was increased dramatically compared with either single mutant. Transcriptional analysis showed that jadR* and jadR2 act synergistically to repress jadomycin production by inhibiting the transcription of jadR1. Furthermore, jadR* and jadR2 reciprocally inhibit each other. The complex interactions among these three CSRs may provide clues for the activation of the jadomycin gene cluster, which would otherwise remain silent without stimulation from stress signals.展开更多
基金supported by the National Key Research and Development Program of China(2021YFA1500500,2019-YFA0405600)the CAS Project for Young Scientists in Basic Research(YSBR-051)+6 种基金the National Science Fund for Distinguished Young Scholars(21925204)the National Natural Science Foundation of China(22202192,U19A2015,22221003,22250007,22163002)the Collaborative Innovation Program of Hefei Science Center,CAS(2022HSCCIP004)the International Partnership,the DNL Cooperation Fund,CAS(DNL202003)the USTC Research Funds of the Double First-Class Initiative(YD9990002016,YD999000-2014)the Program of Chinese Academy of Sciences(123GJHZ2022101GC)the Fundamental Research Funds for the Central Universities(WK9990000095,WK999000-0124).
文摘Electrocatalytic water splitting provides an efficient method for the production of hydrogen.In electrocatalytic water splitting,the oxygen evolution reaction(OER)involves a kinetically sluggish four-electron transfer process,which limits the efficiency of electrocatalytic water splitting.Therefore,it is urgent to develop highly active OER catalysts to accelerate reaction kinetics.Coupling single atoms and clusters in one system is an innovative approach for developing efficient catalysts that can synergistically optimize the adsorption and configuration of intermediates and improve catalytic activity.However,research in this area is still scarce.Herein,we constructed a heterogeneous single-atom cluster system by anchoring Ir single atoms and Co clusters on the surface of Ni(OH)_(2)nanosheets.Ir single atoms and Co clusters synergistically improved the catalytic activity toward the OER.Specifically,Co_(n)Ir_(1)/Ni(OH)_(2)required an overpotential of 255 mV at a current density of 10 mA·cm^(−2),which was 60 mV and 67 mV lower than those of Co_(n)/Ni(OH)_(2)and Ir1/Ni(OH)_(2),respectively.The turnover frequency of Co_(n)Ir_(1)/Ni(OH)_(2)was 0.49 s^(−1),which was 4.9 times greater than that of Co_(n)/Ni(OH)_(2)at an overpotential of 300 mV.
基金supported by the National Natural Science Foundation of China(51772230,51461135004)Hubei Foreign Science and Technology Cooperation Project(2017AHB059)the Japan Society for the Promotion of Science(JSPS)for an Invitation Fellowship for Foreign Researchers(L16531)~~
文摘The present article reports a novel self‐standing nanostructured Au‐Cu(I)@Na2Ti6O13plasmonic photocatalytic membrane,which is prepared by a hydrothermal reaction followed by a simple subsequent heat treatment process.The morphological structure,elemental composition,crystalline phases,and optical properties of the membrane were studied in detail by field‐emission scanning electron microscopy,transmission electron microscopy,X‐ray photoelectron spectroscopy,X‐ray diffraction,and ultraviolet‐visible spectroscopy.Compared with that of a pure Na2Ti6O13membrane,the Au‐Cu(I)@Na2Ti6O13membrane displayed much higher photocatalytic activity for the decomposition of acetaldehyde,a typical volatile organic compound,under visible light illumination.It was found that the photocatalytic activity of the Au‐Cu(I)@Na2Ti6O13membrane increased as the amount of Au was increased.The membrane loaded with2.85wt%Au showed the highest photocatalytic activity in the decomposition of acetaldehyde of the investigated materials.We found that in the photocatalyst membrane,Na2Ti6O13acted as a support material,Au displayed plasmonic absorption,and Cu(I)behaved as a co‐catalyst.The present membrane materials can avoid the self‐aggregation typically observed during the course of photocatalytic reactions.As a result,they can be easily separated,recycled,and reactivated after their practical application,making these functional materials attractive for use in air cleaning applications.
基金supported by grants from the Ministry of Science and Technology of China (2013CB734001, 2009CB118905)the National Natural Science Foundation of China (31270110, 31030003)
文摘The biosynthesis of antibiotics is controlled by cascade regulation involving cluster-situated regulators (CSRs) and pleiotropic regulators. Three CSRs have been identified in the jadomycin biosynthetic gene cluster, including one OmpR-type activator (JadR1) and two TetR-like repressors (JadR* and JadR2). To examine their interactions in jadomycin biosynthesis, a series of mutants were generated and tested for jadomycin production. We noticed that jadomycin production in the jadR*-jadR2 double mutant was increased dramatically compared with either single mutant. Transcriptional analysis showed that jadR* and jadR2 act synergistically to repress jadomycin production by inhibiting the transcription of jadR1. Furthermore, jadR* and jadR2 reciprocally inhibit each other. The complex interactions among these three CSRs may provide clues for the activation of the jadomycin gene cluster, which would otherwise remain silent without stimulation from stress signals.
