The inefficient separation of photogenerated carriers has become a serious problem that limits the photoelectrochemical(PEC)performance of semiconductors.Herein,a sol-gel method was used to prepare BiFeO_(3) ferroelec...The inefficient separation of photogenerated carriers has become a serious problem that limits the photoelectrochemical(PEC)performance of semiconductors.Herein,a sol-gel method was used to prepare BiFeO_(3) ferroelectric thin films with FTO and FTO/Au as substrates,respectively.The polarization electric field of the ferroelectric can more effectively separate the carriers generated in the photoelectrode.Meanwhile,the introduction of an Au buffer layer can reduce the resistance in the process of charge transfer,accelerate the carrier migration,and enhance the efficiency of the charge separation.Under light irradiation,Au/BiFeO_(3) photoelectrode exhibited an extraordinary improvement in PEC water splitting compared with BiFeO_(3).In addition,the ferroelectric polarization electric field causes band bending,which further accelerates the separation of electrons and holes and improves the PEC performance of the photoelectrode.This work promotes the effective application of ferroelectric films in PEC water splitting.展开更多
The objective of the surrent study was to summarize the up-to-date studies to investigate the relationship between vitamin D and Hashimoto thyroiditis(HT).An online search of English and Chinese databases was performe...The objective of the surrent study was to summarize the up-to-date studies to investigate the relationship between vitamin D and Hashimoto thyroiditis(HT).An online search of English and Chinese databases was performed.The studies concerned the investigation of the relationship between vitamin D and HT including meta-analysis,meanwhile the heterogeneities were revealed by subgroup analysis.Fourty six elated studies containing 15,336 participants(HT:6,138 versus control:9,198)were included.HT patients had lower levels of 25(OH)D_(3)(standardised mean difference,−1.09;95%CI:[−1.42,−0.75];P<0.01),and were more likely to be deficient in 25(OH)D_(3)(OR,2.77;95%CI,[1.88,3.91];P<0.05).Obvious heterogeneities in the results of meta-analysis were down to the difference of detection methods and criteria of vitamin D insufficiency among studies.Vitamin D deficiency was colncluded to have a significant relation with HT.展开更多
基金This work was supported by National Natural Science Foundation of China(Grant No.51702130)the Innovation/Entrepreneurship Program of Jiangsu Province and the project of Zhenjiang Key Laboratory of Advanced Sensing Materials and Devices(No.SS2018001)。
文摘The inefficient separation of photogenerated carriers has become a serious problem that limits the photoelectrochemical(PEC)performance of semiconductors.Herein,a sol-gel method was used to prepare BiFeO_(3) ferroelectric thin films with FTO and FTO/Au as substrates,respectively.The polarization electric field of the ferroelectric can more effectively separate the carriers generated in the photoelectrode.Meanwhile,the introduction of an Au buffer layer can reduce the resistance in the process of charge transfer,accelerate the carrier migration,and enhance the efficiency of the charge separation.Under light irradiation,Au/BiFeO_(3) photoelectrode exhibited an extraordinary improvement in PEC water splitting compared with BiFeO_(3).In addition,the ferroelectric polarization electric field causes band bending,which further accelerates the separation of electrons and holes and improves the PEC performance of the photoelectrode.This work promotes the effective application of ferroelectric films in PEC water splitting.
文摘The objective of the surrent study was to summarize the up-to-date studies to investigate the relationship between vitamin D and Hashimoto thyroiditis(HT).An online search of English and Chinese databases was performed.The studies concerned the investigation of the relationship between vitamin D and HT including meta-analysis,meanwhile the heterogeneities were revealed by subgroup analysis.Fourty six elated studies containing 15,336 participants(HT:6,138 versus control:9,198)were included.HT patients had lower levels of 25(OH)D_(3)(standardised mean difference,−1.09;95%CI:[−1.42,−0.75];P<0.01),and were more likely to be deficient in 25(OH)D_(3)(OR,2.77;95%CI,[1.88,3.91];P<0.05).Obvious heterogeneities in the results of meta-analysis were down to the difference of detection methods and criteria of vitamin D insufficiency among studies.Vitamin D deficiency was colncluded to have a significant relation with HT.
