文章通过Stober法合成粒径为300 nm的SiO_(2)纳米球,将该纳米球以乙醇为溶剂配置成一定浓度的悬浮液,通过旋涂法使其在染料敏化太阳能电池(dye-sensitized solar cells,DSSCs)的光阳极P25上形成一层薄膜,再将形成的P25-SiO_(2)复合膜放...文章通过Stober法合成粒径为300 nm的SiO_(2)纳米球,将该纳米球以乙醇为溶剂配置成一定浓度的悬浮液,通过旋涂法使其在染料敏化太阳能电池(dye-sensitized solar cells,DSSCs)的光阳极P25上形成一层薄膜,再将形成的P25-SiO_(2)复合膜放入TiO_(2)溶胶中浸泡一定时间,使得光阳极上的SiO_(2)纳米球被TiO_(2)纳米粒子包裹,形成SiO_(2)-TiO_(2)核壳结构薄膜。与没有散射层的DSSCs相比,以该核壳结构薄膜作为DSSCs的光散射层电池的光电转换效率提高了18%。展开更多
The electron transport layer(ETL)plays an important role on the performance and stability of perovskite solar cells(PSCs).Developing double ETL is a promising strategy to take the advantages of different ETL materials...The electron transport layer(ETL)plays an important role on the performance and stability of perovskite solar cells(PSCs).Developing double ETL is a promising strategy to take the advantages of different ETL materials and avoid their drawbacks.Here,an ultrathin SnO_(2)layer of~5 nm deposited by atomic layer deposit(ALD)was used to construct a TiO_(2)/SnO_(2)double ETL,improving the power conversion efficiency(PCE)from 18.02%to 21.13%.The ultrathin SnO_(2)layer enhances the electrical conductivity of the double layer ETLs and improves band alignment at the ETL/perovskite interface,promoting charge extraction and transfer.The ultrathin SnO_(2)layer also passivates the ETL/perovskite interface,suppressing nonradiative recombination.The double ETL achieves outstanding stability compared with PSCs with TiO_(2)only ETL.The PSCs with double ETL retains 85%of its initial PCE after 900 hours illumination.Our work demonstrates the prospects of using ultrathin metal oxide to construct double ETL for high-performance PSCs.展开更多
The influence of amorphous TiO_2 seeding layers on the phase composition of lead magnesium niobate-lead titanate(0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3,PMN-PT) films deposited on Pt/Ti/SiO2/Si substrate by RF magnetron sputter...The influence of amorphous TiO_2 seeding layers on the phase composition of lead magnesium niobate-lead titanate(0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3,PMN-PT) films deposited on Pt/Ti/SiO2/Si substrate by RF magnetron sputtering was examined.The relation between seeding layer thickness and phase composition at different post annealing temperature was observed by XRD.The thickness of amorphous TiO2 seeding layer and post annealing temperature had remarkable effects on PMN-PT film phase composition.When amorphous seeding layer becomes thick,a new phase of Nb2O5 exists in the films.Only when the seeding layer thickness is suitable,the film with pure perovskite phase can be attained.展开更多
All-solid-state lithium batteries(ASSLBs)based on sulfide electrolytes promise next-generation energy storage with high energy density and safety.However,the sulfide electrolytes suffer from phase instability and slug...All-solid-state lithium batteries(ASSLBs)based on sulfide electrolytes promise next-generation energy storage with high energy density and safety.However,the sulfide electrolytes suffer from phase instability and sluggish interfacial charge transport when pairing with layered oxide cathodes at high voltages.Herein,a simple and efficient strategy is proposed using two-dimensional Ti_(3)C_(2)T_(x)MXene as starting material to in-situ construct a 15 nm Li_(2)TiO_(3) layer on a typical oxide cathode,LiCoO_(2).The in-situ transformation of Ti_(3)C_(2)T_(x)into Li_(2)TiO_(3) layer occurs at a low temperature of 500℃,avoiding the phase deterioration of LiCoO_(2).The thin Li_(2)TiO_(3) layer is Li^(+)conducting and electrochemically stable,thereby preventing the interfacial decomposition of sulfide electrolytes induced by LiCoO_(2) at high voltages and facilitating Li+transport at the interface.Moreover,Li_(2)TiO_(3) can stabilize the layer structure of LiCoO_(2) at high voltages.Consequently,the sulfide-based ASSLB using LiCoO_(2)@Li_(2)TiO_(3) cathode can operate stably at a high voltage of up to 4.5 V(vs.Li+/Li),delivering an outstanding initial specific discharge capacity of 138.8 m Ah/g with a high capacity retention of 86.2% after 100 cycles at 0.2 C.The in-situ transformation strategy may also apply to other MXenes,offering a general approach for constructing other advanced lithiated coatings for oxide cathodes.展开更多
Fluidized bed atomic layer deposition is an efficient technique for particle coating with precise control over the film thickness and uniformity at the sub-nanoscale.In this study,a fluidized bed with a central tube i...Fluidized bed atomic layer deposition is an efficient technique for particle coating with precise control over the film thickness and uniformity at the sub-nanoscale.In this study,a fluidized bed with a central tube is designed,where the central tube has two roles:improve fluidization and deliver precursors separately.The synthesis of core-shell structured SiO_(2)/TiO_(2)nanoparticle catalysts for photodegradation of tetracycline hydrochloride(TC)is carried out using TiCl_(4)and H_(2)O as precursors at 180℃under atmospheric pressure.Under the combination of vibration and central tube,the segregation of agglomerate size along the bed height is weakened,and the prepared SiO_(2)/TiO_(2)nanoparticles show excellent photocatalytic degradation performance:the degradation efficiency on TC is 96%under 300 W xenon lamp irradiation for 60 min.The mechanism of enhanced photocatalytic activity is due to the Ti-O-Si bonds generated at the interface,which increase the ability to absorb sunlight and accelerate the separation of holes and electrons.展开更多
文摘文章通过Stober法合成粒径为300 nm的SiO_(2)纳米球,将该纳米球以乙醇为溶剂配置成一定浓度的悬浮液,通过旋涂法使其在染料敏化太阳能电池(dye-sensitized solar cells,DSSCs)的光阳极P25上形成一层薄膜,再将形成的P25-SiO_(2)复合膜放入TiO_(2)溶胶中浸泡一定时间,使得光阳极上的SiO_(2)纳米球被TiO_(2)纳米粒子包裹,形成SiO_(2)-TiO_(2)核壳结构薄膜。与没有散射层的DSSCs相比,以该核壳结构薄膜作为DSSCs的光散射层电池的光电转换效率提高了18%。
基金supported by the National Key R&D Program of China(Grant No.2019YFB1503201)the National Natural Science Foundation of China(Grant Nos.52172238,52102304,51902264,and 51902177)+3 种基金the Natural Science Foundation of Shanxi Province,China(Grant No.2020JM093)Joint Research Funds of Department of Science&Technology of Shaanxi Province and Northwestern Polytechnical University(Grant No.2020GXLH-Z-014)Science Technology and Innovation Commission of Shenzhen Municipality(Grant No.JCYJ20190807111605472)the Fundamental Research Funds for the Central Universities,China(Grant Nos.3102019JC0005 and G2021KY05103)。
文摘The electron transport layer(ETL)plays an important role on the performance and stability of perovskite solar cells(PSCs).Developing double ETL is a promising strategy to take the advantages of different ETL materials and avoid their drawbacks.Here,an ultrathin SnO_(2)layer of~5 nm deposited by atomic layer deposit(ALD)was used to construct a TiO_(2)/SnO_(2)double ETL,improving the power conversion efficiency(PCE)from 18.02%to 21.13%.The ultrathin SnO_(2)layer enhances the electrical conductivity of the double layer ETLs and improves band alignment at the ETL/perovskite interface,promoting charge extraction and transfer.The ultrathin SnO_(2)layer also passivates the ETL/perovskite interface,suppressing nonradiative recombination.The double ETL achieves outstanding stability compared with PSCs with TiO_(2)only ETL.The PSCs with double ETL retains 85%of its initial PCE after 900 hours illumination.Our work demonstrates the prospects of using ultrathin metal oxide to construct double ETL for high-performance PSCs.
文摘The influence of amorphous TiO_2 seeding layers on the phase composition of lead magnesium niobate-lead titanate(0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3,PMN-PT) films deposited on Pt/Ti/SiO2/Si substrate by RF magnetron sputtering was examined.The relation between seeding layer thickness and phase composition at different post annealing temperature was observed by XRD.The thickness of amorphous TiO2 seeding layer and post annealing temperature had remarkable effects on PMN-PT film phase composition.When amorphous seeding layer becomes thick,a new phase of Nb2O5 exists in the films.Only when the seeding layer thickness is suitable,the film with pure perovskite phase can be attained.
基金the financial support from the National Natural Science Foundation of China(Nos.52201242,52250010)Natural Science Foundation of Jiangsu Province(Nos.BK20200386,BK20200186)+1 种基金Young Elite Scientists Sponsorship Program by CAST(No.2021QNRC001)the Fundamental Research Funds for the Central Universities(No.2242022R40018)。
文摘All-solid-state lithium batteries(ASSLBs)based on sulfide electrolytes promise next-generation energy storage with high energy density and safety.However,the sulfide electrolytes suffer from phase instability and sluggish interfacial charge transport when pairing with layered oxide cathodes at high voltages.Herein,a simple and efficient strategy is proposed using two-dimensional Ti_(3)C_(2)T_(x)MXene as starting material to in-situ construct a 15 nm Li_(2)TiO_(3) layer on a typical oxide cathode,LiCoO_(2).The in-situ transformation of Ti_(3)C_(2)T_(x)into Li_(2)TiO_(3) layer occurs at a low temperature of 500℃,avoiding the phase deterioration of LiCoO_(2).The thin Li_(2)TiO_(3) layer is Li^(+)conducting and electrochemically stable,thereby preventing the interfacial decomposition of sulfide electrolytes induced by LiCoO_(2) at high voltages and facilitating Li+transport at the interface.Moreover,Li_(2)TiO_(3) can stabilize the layer structure of LiCoO_(2) at high voltages.Consequently,the sulfide-based ASSLB using LiCoO_(2)@Li_(2)TiO_(3) cathode can operate stably at a high voltage of up to 4.5 V(vs.Li+/Li),delivering an outstanding initial specific discharge capacity of 138.8 m Ah/g with a high capacity retention of 86.2% after 100 cycles at 0.2 C.The in-situ transformation strategy may also apply to other MXenes,offering a general approach for constructing other advanced lithiated coatings for oxide cathodes.
基金support to this work by National Natural Science Foundation of China(grant No.52376141)is gratefully acknowledged.
文摘Fluidized bed atomic layer deposition is an efficient technique for particle coating with precise control over the film thickness and uniformity at the sub-nanoscale.In this study,a fluidized bed with a central tube is designed,where the central tube has two roles:improve fluidization and deliver precursors separately.The synthesis of core-shell structured SiO_(2)/TiO_(2)nanoparticle catalysts for photodegradation of tetracycline hydrochloride(TC)is carried out using TiCl_(4)and H_(2)O as precursors at 180℃under atmospheric pressure.Under the combination of vibration and central tube,the segregation of agglomerate size along the bed height is weakened,and the prepared SiO_(2)/TiO_(2)nanoparticles show excellent photocatalytic degradation performance:the degradation efficiency on TC is 96%under 300 W xenon lamp irradiation for 60 min.The mechanism of enhanced photocatalytic activity is due to the Ti-O-Si bonds generated at the interface,which increase the ability to absorb sunlight and accelerate the separation of holes and electrons.
