Pb-Sn mixed perovskite solar cells(PSCs)are crucial components for realizing efficient all-perovskite tandem devices.However,their efficiency and stability are severely limited by oxidative degradation(Sn^(4+)formatio...Pb-Sn mixed perovskite solar cells(PSCs)are crucial components for realizing efficient all-perovskite tandem devices.However,their efficiency and stability are severely limited by oxidative degradation(Sn^(4+)formation)and metallic defects(Sn^(0)/Pb^(0)).In addition,the rapid and uncontrolled Sn^(2+)nucleation kinetics result in nonuniform crystallization.Herein,we introduce a natural redox shuttle glutathione(GSH)in Pb-Sn mixed PSCs,achieving regenerable antioxidation and crystallization regulation simultaneously.The reversible redox reactions between GSH and glutathione disulfide(GSSG)enable the self-healing of Sn^(4+)and Sn^(0)/Pb^(0)impurities,creating a regenerable antioxidation protective shell at the perovskite interfaces.Meanwhile,the strong coordination between GSH and perovskite regulates the crystallization process,optimizing the nucleation and crystallization kinetics.Furthermore,the GSH incorporation creates a high-quality charge separation junction at the perovskite/hole transport layer,facilitating carrier separation and extraction.The optimized Pb-Sn PSCs exhibit impressive power conversion efficiencies(PCEs)of up to 23.71%.The champion all-perovskite tandem PSCs with GSH achieve a PCE of 28.49%and retain 90%of the initial PCE after 560 h of continuous illumination.This work establishes a new nature-inspired redox shuttling strategy and elucidates its working mechanism,advancing the development of efficient and stable all-perovskite tandem solar cells.展开更多
Molecular engineering has demonstrated significant potential in modulating the crystallization and interfacial defect passivation of perovskite films.However,the deprotonation of conventional organic ammonium under li...Molecular engineering has demonstrated significant potential in modulating the crystallization and interfacial defect passivation of perovskite films.However,the deprotonation of conventional organic ammonium under light or thermal stress compromises the long-term operational stability of perovskite solar cells(PSCs).Here,we designed two multifunctional deprotonation-resistant cycloalkyl amidines with different heteroatoms,tetrahydro-2H-pyran-4-carboximidamide hydroiodide(TPCAI)and tetrahydro-2H-t hiopyran-4-carboximidamide hydroiodide(TTCAI),which were used to precisely regulate the crystallization process and interfacial properties of perovskite films.The larger dipole moment and enhanced electronic properties of sulfur-substituted TTCAI than TPCAI strengthen its interaction with the perovskite lattice.This interaction markedly slows down the crystallization rate,promotes preferential growth along the(100)crystal plane,reduces defect density,and effectively suppresses non-radiative recombination.TTCAI meanwhile construction of passivation layers on the surface and grain boundaries of the perovskite film through multiple hydrogen-bond interactions,passivates grain boundary defects,which significantly improves the film's environmental stability.Consequently,the TTCAI-modified device achieved a high efficiency of 25.58%,and the unencapsulated device retained 92%of its initial efficiency after 1200 h of storage at 65℃ under air(RH 30–65%).This study provides new insights into the rational design of multifunctional amidine ligands toward achieving efficient and stable PSCs.展开更多
Aiming to elucidate the hydrogen absorption/desorption cycling properties of Mg-based alloys with in-situ formed Mg_(2)Ni and LaH_(x)(x=2,3)nanocrystallines,the hydrogen storage cycle stability,hydriding/dehydriding c...Aiming to elucidate the hydrogen absorption/desorption cycling properties of Mg-based alloys with in-situ formed Mg_(2)Ni and LaH_(x)(x=2,3)nanocrystallines,the hydrogen storage cycle stability,hydriding/dehydriding cycling kinetics and thermodynamic stability of the experimental alloys have been investigated in detail.The results show that the Mg-Ni-La alloys exhibit improved hydrogen storage cycling properties and can remain storage hydrogen above 5.5 wt%after 200 cycles.With the increase of cycling numbers,the dehydrogenation rates of the experimental samples increase firstly and then gradually decrease,and eventually maintain relative stable state.Microstructure observation reveals that powders sintering and hydrogen decrepitation both exist during hydrogen absorption/desorption cycles due to repeated volume expansion and contraction.Meanwhile,the in-situ formed LaH_(x)(x=2,3)and Mg_(2)Ni nanocrystallines stabilize the microstructures of the particles and hinder the powders sintering.After 200 cycles,the average particle size of the experimental samples decreases and the specific surface area apparently increases,which leads to the decomposition temperatures of MgH_(2)and Mg_(2)NiH_(4)slightly shift to lower temperatures.Moreover,Mg_(2)Ni and LaH_(x)(x=2,3)have been proven to be stable catalysts during long-term cycling,which can still uniformly distribute within the powders after 200 cycles.展开更多
当前,中国期刊界已经普遍认识到发表专刊/专栏可以提升期刊的影响力。《高等学校化学研究》(Chemical Research in Chinese Universities, CRCU)通过5年23期专刊/专栏的出版推动了期刊进步并积累了丰富的经验。本文从分析科技期刊评价...当前,中国期刊界已经普遍认识到发表专刊/专栏可以提升期刊的影响力。《高等学校化学研究》(Chemical Research in Chinese Universities, CRCU)通过5年23期专刊/专栏的出版推动了期刊进步并积累了丰富的经验。本文从分析科技期刊评价体系开始,指出了限制期刊发展的隐形圈子,通过引入X因素,详细解释了各种形式专刊/专栏能够破圈的原因。结合工作实践和诸多举例,让读者深入浅出的了解专刊/专栏出版的具体流程和关键步骤,可能遇到的问题和解决方案,最后强调了专刊出版后宣传工作的重要性,并结合期刊5年来的成果,给其他科技期刊组建专刊提供了针对性的建议。展开更多
基金supported by Guangdong Basic and Applied Basic Research Foundation(2025A1515011362)the National Natural Science Foundation of China(52102304,52172238)Open Project of Shaanxi Laboratory of Aerospace Power(2021SXSYS-01-03).
文摘Pb-Sn mixed perovskite solar cells(PSCs)are crucial components for realizing efficient all-perovskite tandem devices.However,their efficiency and stability are severely limited by oxidative degradation(Sn^(4+)formation)and metallic defects(Sn^(0)/Pb^(0)).In addition,the rapid and uncontrolled Sn^(2+)nucleation kinetics result in nonuniform crystallization.Herein,we introduce a natural redox shuttle glutathione(GSH)in Pb-Sn mixed PSCs,achieving regenerable antioxidation and crystallization regulation simultaneously.The reversible redox reactions between GSH and glutathione disulfide(GSSG)enable the self-healing of Sn^(4+)and Sn^(0)/Pb^(0)impurities,creating a regenerable antioxidation protective shell at the perovskite interfaces.Meanwhile,the strong coordination between GSH and perovskite regulates the crystallization process,optimizing the nucleation and crystallization kinetics.Furthermore,the GSH incorporation creates a high-quality charge separation junction at the perovskite/hole transport layer,facilitating carrier separation and extraction.The optimized Pb-Sn PSCs exhibit impressive power conversion efficiencies(PCEs)of up to 23.71%.The champion all-perovskite tandem PSCs with GSH achieve a PCE of 28.49%and retain 90%of the initial PCE after 560 h of continuous illumination.This work establishes a new nature-inspired redox shuttling strategy and elucidates its working mechanism,advancing the development of efficient and stable all-perovskite tandem solar cells.
基金supported by the National Natural Science Foundation of China(22471218)Shaanxi Fundamental Science Research Project for Chemistry&Biology(22JHQ002)+3 种基金Program for Young Talents of Shaanxi Province(5113190023)the Natural Science Foundation of Shaanxi Province(2025JC-YBMS-147 and2024JC-ZDXM-08)the Natural Science Foundation of Zhejiang Province(LY24B010002)the Natural Science Foundation of Guangdong Province(2025A1515012305)。
文摘Molecular engineering has demonstrated significant potential in modulating the crystallization and interfacial defect passivation of perovskite films.However,the deprotonation of conventional organic ammonium under light or thermal stress compromises the long-term operational stability of perovskite solar cells(PSCs).Here,we designed two multifunctional deprotonation-resistant cycloalkyl amidines with different heteroatoms,tetrahydro-2H-pyran-4-carboximidamide hydroiodide(TPCAI)and tetrahydro-2H-t hiopyran-4-carboximidamide hydroiodide(TTCAI),which were used to precisely regulate the crystallization process and interfacial properties of perovskite films.The larger dipole moment and enhanced electronic properties of sulfur-substituted TTCAI than TPCAI strengthen its interaction with the perovskite lattice.This interaction markedly slows down the crystallization rate,promotes preferential growth along the(100)crystal plane,reduces defect density,and effectively suppresses non-radiative recombination.TTCAI meanwhile construction of passivation layers on the surface and grain boundaries of the perovskite film through multiple hydrogen-bond interactions,passivates grain boundary defects,which significantly improves the film's environmental stability.Consequently,the TTCAI-modified device achieved a high efficiency of 25.58%,and the unencapsulated device retained 92%of its initial efficiency after 1200 h of storage at 65℃ under air(RH 30–65%).This study provides new insights into the rational design of multifunctional amidine ligands toward achieving efficient and stable PSCs.
基金supported by Natural Science Foundation of Shaanxi Province,China(2017JM5079)The 111 project(No.B08040)is also acknowledged.
文摘Aiming to elucidate the hydrogen absorption/desorption cycling properties of Mg-based alloys with in-situ formed Mg_(2)Ni and LaH_(x)(x=2,3)nanocrystallines,the hydrogen storage cycle stability,hydriding/dehydriding cycling kinetics and thermodynamic stability of the experimental alloys have been investigated in detail.The results show that the Mg-Ni-La alloys exhibit improved hydrogen storage cycling properties and can remain storage hydrogen above 5.5 wt%after 200 cycles.With the increase of cycling numbers,the dehydrogenation rates of the experimental samples increase firstly and then gradually decrease,and eventually maintain relative stable state.Microstructure observation reveals that powders sintering and hydrogen decrepitation both exist during hydrogen absorption/desorption cycles due to repeated volume expansion and contraction.Meanwhile,the in-situ formed LaH_(x)(x=2,3)and Mg_(2)Ni nanocrystallines stabilize the microstructures of the particles and hinder the powders sintering.After 200 cycles,the average particle size of the experimental samples decreases and the specific surface area apparently increases,which leads to the decomposition temperatures of MgH_(2)and Mg_(2)NiH_(4)slightly shift to lower temperatures.Moreover,Mg_(2)Ni and LaH_(x)(x=2,3)have been proven to be stable catalysts during long-term cycling,which can still uniformly distribute within the powders after 200 cycles.
文摘当前,中国期刊界已经普遍认识到发表专刊/专栏可以提升期刊的影响力。《高等学校化学研究》(Chemical Research in Chinese Universities, CRCU)通过5年23期专刊/专栏的出版推动了期刊进步并积累了丰富的经验。本文从分析科技期刊评价体系开始,指出了限制期刊发展的隐形圈子,通过引入X因素,详细解释了各种形式专刊/专栏能够破圈的原因。结合工作实践和诸多举例,让读者深入浅出的了解专刊/专栏出版的具体流程和关键步骤,可能遇到的问题和解决方案,最后强调了专刊出版后宣传工作的重要性,并结合期刊5年来的成果,给其他科技期刊组建专刊提供了针对性的建议。
