Ultrathin TiO2 nanosheets with coexposed {001}/{101} facets have attracted considerable attention because of their high photocatalytic activity. However, the charge-separated states in the TiO2 nanosheets must be exte...Ultrathin TiO2 nanosheets with coexposed {001}/{101} facets have attracted considerable attention because of their high photocatalytic activity. However, the charge-separated states in the TiO2 nanosheets must be extended to further enhance their photocatalytic activity for H2 evolution. Herein, we present a successful attempt to selectively dope lanthanide ions into the {101} facets of ultrathin TiO2 nanosheets with coexposed {001}/{101} facets through a facile one-step solvothermal method. The lanthanide doping slightly extended the light-harvesting region and markedly improved the charge-separated states of the TiO2 nanosheets as evidenced by UV-vis absorption and steady-state/transient photoluminescence spectra. Upon simulated sunlight irradiation, we observed a 4.2-fold enhancement in the photocatalytic H2 evolution activity of optimal Yb3+-doped TiO2 nanosheets compared to that of their undoped counterparts. Furthermore, when Pt nanoparticles were used as cocatalysts to reduce the H2 overpotential in this system, the photocatalytic activity enhancement factor increased to 8.5. By combining these results with those of control experiments, we confirmed that the extended charge-separated states play the main role in the enhancement of the photocatalytic H2 evolution activity of lanthanide-doped TiO2 nanosheets with coexposed {001}/{101} facets.展开更多
Spermatogenesis is one of the most complicated cell differentiation processes in animals, which consists of mitosis, meiosis, and the post-meiotic phase of male germ cell development, i.e.,spermiogenesis. Mitosis is r...Spermatogenesis is one of the most complicated cell differentiation processes in animals, which consists of mitosis, meiosis, and the post-meiotic phase of male germ cell development, i.e.,spermiogenesis. Mitosis is responsible for germline maintenance,while meiosis reduces the chromosome number by half and creates genetic diversity in the sperm.展开更多
基金supported by the National Natural Science Foundation of China(51772041,11474046,61775024)the Natural Science Foundation of Liaoning Province(20170540190,201602191)+3 种基金the Program for Liaoning Excellent Talents in University(LNET)(LR2015016,LR2017004)the Program for Dalian Excellent Talents(2016RQ069)the Science and the Technique Foundation of Dalian(2014J11JH134,2015J12JH201)the Fundamental Research Funds for the Central Universities(wd01206)~~
文摘Ultrathin TiO2 nanosheets with coexposed {001}/{101} facets have attracted considerable attention because of their high photocatalytic activity. However, the charge-separated states in the TiO2 nanosheets must be extended to further enhance their photocatalytic activity for H2 evolution. Herein, we present a successful attempt to selectively dope lanthanide ions into the {101} facets of ultrathin TiO2 nanosheets with coexposed {001}/{101} facets through a facile one-step solvothermal method. The lanthanide doping slightly extended the light-harvesting region and markedly improved the charge-separated states of the TiO2 nanosheets as evidenced by UV-vis absorption and steady-state/transient photoluminescence spectra. Upon simulated sunlight irradiation, we observed a 4.2-fold enhancement in the photocatalytic H2 evolution activity of optimal Yb3+-doped TiO2 nanosheets compared to that of their undoped counterparts. Furthermore, when Pt nanoparticles were used as cocatalysts to reduce the H2 overpotential in this system, the photocatalytic activity enhancement factor increased to 8.5. By combining these results with those of control experiments, we confirmed that the extended charge-separated states play the main role in the enhancement of the photocatalytic H2 evolution activity of lanthanide-doped TiO2 nanosheets with coexposed {001}/{101} facets.
基金supported by the National Key R&D Program of China (2021YFC2700200 and 2022YFA1303300)National Natural Science Foundation of China (32330053,31830109,31821004,32271347,32101037 and 32071286)+5 种基金Science and Technology Commission of Shanghai Municipality (19JC1410200,21YF1452700 and 21ZR1470500)Zhejiang Provincial Natural Science Foundation of China (LZ23C050001)the Young Elite Scientist Sponsorship Program of the China Association for Science and Technology (2021QNRC001)the Research Funds of Hangzhou Institute for Advanced Study,UCAS(2023HIAS-Y022)the Foundation of Key Laboratory of Gene Engineering of the Ministry of Educationthe New Cornerstone Science Foundation (NCI202329)。
文摘Spermatogenesis is one of the most complicated cell differentiation processes in animals, which consists of mitosis, meiosis, and the post-meiotic phase of male germ cell development, i.e.,spermiogenesis. Mitosis is responsible for germline maintenance,while meiosis reduces the chromosome number by half and creates genetic diversity in the sperm.
