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Surface-anchoring zwitterionic antioxidant enables efficient,stable,and scalable all-perovskite tandem solar cells

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Science China Chemistry 2021年第1期64卷 3-4页

作者： xiaoyu yang Rui Zhu State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsFrontiers Science Center for Nano-optoelectronics&Collaborative Innovation Center of Quantum MatterPeking UniversityBeijing 100871China Peking University yangtze Delta Institute of Optoelectronics Nantong 226010China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Lead-halide perovskite photovoltaics(PVs)have achieved impressive progress in power conversion efficiencies(PCEs)over the past ten years,accelerating their step forward to next-generation commercial PV technologies[1].As a leading candidate for perovskite PVs,monolithic all-perovskite tandem solar cells(PTSCs)have achieved the best24.8%for small-area devices(0.049 cm^2)in 2019。

关键词： perovskite enable impressive

Catalytic Asymmetric Synthesis of Inherently Chiral Saddle- Shaped Dibenzo[b,fI[1,5]diazocines

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Chinese Journal of Chemistry 2024年第17期42卷 1953-1959页

作者： Jinmiao Zhou Mengyao Tang xiaoyu yang Schoolof Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Dibenzo[b,fi[1,5]diazocines are a class of eight-membered heterocycles,which exhibit unique rigid saddle-shaped structure and possess inherent *** this study,we report a convenient and straightforward method for the catalytic enantioselective synthesis of these unique chiral molecules through chiral phosphoric acid-catalyzed dimerization of ***,the addition of corresponding 2-acylaniline as the co-catalyst significantly improved the efficiency of these reactions,and a simple phase separation operation resulted in products with excellent *** studies were performed to elucidate the mechanism behind these reactions,leading to the proposal of a plausible reaction mechanism based on the study findings.

关键词： Dibenzo[b,f]diazocines Saddle-shaped inherent chirality Organocatalysis Asymmetric catalysis Medium-ring compounds Cooperativecatalysis Chiral phosphoricacids

Asymmetric Aminations and Kinetic Resolution of Acyclic α-Branched Ynones

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Chinese Journal of Chemistry 2022年第1期40卷 15-20页

作者： Faqian He Guosong Shen xiaoyu yang School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China Shanghai Institute of Organic Chemistry Chinese Academy of SciencesShanghai 200032China

An efficient method for asymmetric synthesis of acyclic α-tertiary amine derivatives has been achieved through enantioselective aminations of α-branched ynones with azodicarboxylates enabled by chiral phosphoric acid ***,kinetic resolution of racemic starting material was realized under these conditions,which gave access to valuable enantioenriched α-substituted ketones.

关键词： Asymmetric catalysis Amination Kinetic resolution Chiral phosphoric acids α-Branched ynones

Preface to special issue on“Engineering Nanostructured Materials for Advanced Energy and Environmental Catalysis”

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1621-1622页

作者： Zhong-Yong Yuan xiaoyu yang Xinying Liu School of Materials Science and Engineering Nankai UniversityTianjin 300350China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Institute for Development of Energy for African Sustainability University of South AfricaJohannesburg 1710South Africa

Sustainability in environment and energy is the watchword of the 21st *** excessive growth in fossil energy consumption and the ensuing acceleration of global climate change as well as related air and water pollution have attracted great attention,on the view of national security *** sustainability has recently emerged as an energy policy issue,requiring the rapid development of science and technology to achieve the goal of carbon peaking and carbon *** sustainability challenges faced by the world are complex and involve multiple interdependent *** utilization of green energy has been required to attempt to change the current energy and environment *** the rapid progress in advanced nanotechnologies,nanostructures and corresponding nanomaterials start to play a vital role in solving critical problems,particularly in energy and environmental ***,advanced materials and green catalysis are being more and more important in solving the energy and environmental *** as building units have brought a unique opportunity for advancing science and technology to create updated products meeting the global demands of environmental remediation and sustainable energy development.

关键词： globally neutral catalysis

(Parallel) kinetic resolution of 3,3-disubstituted indolines via organocatalyzed reactions with azodicarboxylates

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Science China Chemistry 2024年第3期67卷 973-980页

作者： Qianwen Jiang Dekun Zhang Mengyao Tang Hua Liu xiaoyu yang School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

A novel kinetic resolution(KR) method has been developed for 3,3-disubstituted indolines, whose catalytic asymmetric synthesis remains a significant challenge in organic synthesis. The key to the success of this KR protocol lies in the utilization of chiral phosphoric acid-catalyzed triazane formation reaction with azodicarboxylates, which enables the enantioselective synthesis of various substituted indolines bearing C3-quaternary stereocenters with good to high enantioselectivities(with sfactors up to 70). Moreover, an intriguing parallel kinetic resolution(PKR) has been developed by combining triazane formation and dehydrogenation reactions using different azodicarboxylates. Experimental studies have provided insight into the mechanism of this PKR reaction, demonstrating stereoselectivity in both triazane formation and dehydrogenation steps, favoring the opposite enantiomers. The large-scale synthesis and diverse derivatizations of the products, particularly the imine groupcontaining 3H-indoles, demonstrate the value of these(P)KR methods.

关键词： asymmetric organocatalysis kinetic resolution 3 3-disubstituted indolines azodicarboxylate triazanes

Influence of inherent iron and oxygen concentrations on selenite sorption process using bentonite

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Science China Chemistry 2017年第9期60卷 1258-1264页

作者： Jiangang He Xueling Qiao Yanlin Shi Yao Li xiaoyu yang Wanqiang Zhou Chunli Liu Beijing National Laboratory for Molecular Sciences Fundamental Science Laboratory on Radiochemistry&Radiation ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The oxygen concentration and inherent Fe in bentonite have a significant influence on the Se(IV) sorption process. In this study, the sorption of selenite on natural bentonite was investigated using a batch experiment method, and the distribution coefficient (Kd) values were obtained in the pH range from 2.0 to 10.0 under oxic/anoxic conditions. The Kdvalues always reached a maximum value at a pH of 4 under oxic conditions and at a pH of 8 under anoxic conditions; meanwhile, the Kdvalue under anoxic conditions was larger than the value under oxic conditions, especially in regard to the maximum Kdvalues. The oxygen conditions have a significant influence on the ratio of redox-sensitive Fe2+/Fe3+, which was closely related to the difference in the Kdvalues under both oxic/anoxic conditions. Ferric selenite and green rust could be responsible for the maximum Kdvalues under oxic/anoxic conditions. In the leaching experiments, we found that the Fe2+in bentonite could replace Mg2+and Al3+in the octahedral sheet. Spectroscopy methods, such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) were used to characterize the surface properties of the samples after reaction. Overall, this study shows that the addition of Fe2+-containing materials into backfill/buffer materials under anoxic condition could enhance the sorption of79Se(IV). © 2017, Science China Press and Springer-Verlag GmbH Germany.

关键词： Bentonite Oxygen Sorption Spectroscopic analysis X ray absorption spectroscopy X ray diffraction

Experimental Wave Attenuation Study over Flexible Plants on a Submerged Slope

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Journal of Ocean University of China 2017年第6期16卷 1009-1017页

作者： YIN Zegao yang xiaoyu XU Yuanzhao DING Meiling LU Haixiang Shandong Province Key Laboratory of Ocean Engineering Ocean University of China Qingdao 266100 P. R. China Engineering College Ocean University of China Qingdao 266100 P. R. China

Using plants is a kind of environmentally-friendly coastal protection to attenuate wave energy. In this paper, a set of experiments were conducted to investigate the wave attenuation performance using flexible grasses on a submerged slope, and the wave attenuation coefficient for these experiments was calculated for different still water depths, slope and grass configurations. It was found that the slope plays a significant role in wave attenuation. The wave attenuation coefficient increases with increasing relative row number and relative density. For a small relative row number, the two configurations from the slope top to its toe and from the slope toe to its top performed equally to a large extent. For a medium relative row number, the configuration from the slope toe to its top performed more poorly than that from the slope top to its toe; however, it performed better than that from the slope top to its toe for a high relative row number. With a single row of grasses close to the slope top from the slope toe, the wave attenuation coefficient shows double peaks. With increasing grass rows or still water depth, the grass location corresponding to the maximum wave attenuation coefficient is close to the slope top. The dimensional analysis and the least square method were used to derive an empirical equation of the wave attenuation coefficient considering the effect of relative density, the slope, the relative row number and the relative location of the middle row, and the equation was validated to experimental data.

关键词： submerged slope flexible grasses wave attenuation coefficient experiment

Integrated materials design and informatics platform within the materials genome framework

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Chinese Science Bulletin 2014年第15期59卷 1755-1764页

作者： Zhuo Wang xiaoyu yang Yufei Zheng Qilong Yong Hang Su Caifu yang Central Iron & Steel Research Institute Computer Network Information Center Chinese Academy of Sciences Institute of Computing Technology Chinese Academy of Sciences

The fundamental idea of materials genome initiative is the integration of computing platform,experimental platform,and data platform to speed up the material innovation hence reduce time and *** paper describes the basic concept of building an integrated computational platform and data platform for material innovation from the perspective of high-throughput simulation and materials knowledge *** material data platform that can integrate material database,heterogeneous material data,various scripts,and open-source material simulation code together is particularly *** metallic materials as an example,a brief introduction to metallic materials data management is given,and how to manage the semi-structure and unstructured iron and steel material data is also presented.

关键词：合材料基因组信息平台材料数据库设计框架数据平台计算平台

Topological Design of Microstructures of Materials Containing Multiple Phases of Distinct Poisson’s Ratios

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Computer Modeling in Engineering & Sciences 2021年第1期126卷 293-310页

作者： Kai Long xiaoyu yang Nouman Saeed Zhuo Chen Yi Min Xie State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing102206China Centre for Innovative Structures and Materials School of EngineeringRMIT UniversityMelbourne3001Australia

A methodology for achieving the maximum bulk or shear modulus in an elastic composite composed of two isotropic phases with distinct Poisson’s ratios is proposed.A topology optimization algorithm is developed which is capable of finding microstructures with extreme properties very close to theoretical upper *** effective mechanical properties of the designed composite are determined by a numerical homogenization *** sensitivities with respect to design variables are derived by simultaneously interpolating Young’smodulus and Poisson’s ratio using different *** so-called solid isotropicmaterial with penalizationmethod is developed to establish the optimization *** bulk or shearmodulus is considered as the objective function,and the volume fraction of constituent phases is taken as *** ofmoving asymptotes is applied to update the design *** 3D numerical examples are presented to demonstrate the effectiveness of the proposed structural optimization *** effects of key parameters such as Poisson’s ratios and volume fractions of constituent phase on the final designs are investigated.A series of novel microstructures are obtained fromthe proposed *** is found that the optimized bulk and shearmoduli of all the studied composites are very close to the Hashin-Shtrikman-Walpole bounds.

关键词： Poisson’s ratio topology optimization homogenization bulk modulus shear modulus