Herein we report a synthesis of the natural tribolure,an aggregation pheromone which consists of(4R,8S)-,(4R,8R)-,(4S,8S)-,and(4S,8R)-4,8-dimethyldecanals in a ratio of 4/4/1/1,from(R)-4-methyl-δ-valerolactone,a by-p...Herein we report a synthesis of the natural tribolure,an aggregation pheromone which consists of(4R,8S)-,(4R,8R)-,(4S,8S)-,and(4S,8R)-4,8-dimethyldecanals in a ratio of 4/4/1/1,from(R)-4-methyl-δ-valerolactone,a by-product of the degradation of steroidal sapogenins.Merging the stereoisomers of the same ratios into one synthetic target and using the same chiron for the construction of the C4 stereocenters are notable features of this synthesis.展开更多
The composite photoanodes composed by cobalt phosphate catalyst(Co-Pi) modified semiconductor have been widely used for solar water splitting,but the improvement mechanism has not been experimentally confirmed.Here we...The composite photoanodes composed by cobalt phosphate catalyst(Co-Pi) modified semiconductor have been widely used for solar water splitting,but the improvement mechanism has not been experimentally confirmed.Here we use transient photoelectrochemical measurements and impedance spectroscopy to investigate the effect of Co-Pi catalyst on hematite nanowire photoanode.It is found that under illumination the Co-Pi catalyst can efficiently promote the transfer of photo-generated holes to the Co-Pi layer by increasing the electrical conductivity of the composite structure under a low potential.The Co-Pi catalyst can recombine with photo-generated electrons to reduce the surface recombination efficiency of photo-generated holes and electrons under a high potential.These results provide important new understanding of the performance improvement mechanism for the Co-Pi-modified semiconductor nanowire composite photoanodes.展开更多
文摘Herein we report a synthesis of the natural tribolure,an aggregation pheromone which consists of(4R,8S)-,(4R,8R)-,(4S,8S)-,and(4S,8R)-4,8-dimethyldecanals in a ratio of 4/4/1/1,from(R)-4-methyl-δ-valerolactone,a by-product of the degradation of steroidal sapogenins.Merging the stereoisomers of the same ratios into one synthetic target and using the same chiron for the construction of the C4 stereocenters are notable features of this synthesis.
基金financially supported by the National Natural Science Foundation of China (No.21503109)the Research-Starting Funds for Introduced Talents of Nanjing Tech University。
文摘The composite photoanodes composed by cobalt phosphate catalyst(Co-Pi) modified semiconductor have been widely used for solar water splitting,but the improvement mechanism has not been experimentally confirmed.Here we use transient photoelectrochemical measurements and impedance spectroscopy to investigate the effect of Co-Pi catalyst on hematite nanowire photoanode.It is found that under illumination the Co-Pi catalyst can efficiently promote the transfer of photo-generated holes to the Co-Pi layer by increasing the electrical conductivity of the composite structure under a low potential.The Co-Pi catalyst can recombine with photo-generated electrons to reduce the surface recombination efficiency of photo-generated holes and electrons under a high potential.These results provide important new understanding of the performance improvement mechanism for the Co-Pi-modified semiconductor nanowire composite photoanodes.
