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Hollow tubular conjugated organic polymer for lithium batteries

Nano Research 2023年第2期16卷 2474-2479页

作者： Weijia Zhang Shibing Zheng Tao Ma Tianjiang Sun Zhanliang Tao Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage CentreCollege of ChemistryNankai UniversityHaihe Laboratory of Sustainable Chemical TransformationsTianjin 300071China

Polymerization is a valid strategy to solve the dissolution issue of organic electrode materials in aprotic electrolytes.However,conventional polymers usually with amorphous structures and morphology’s influence on electrochemistry have rarely been studied.Herein,a hollow tubular poly phenyl pyrene-4,5,9,10-tetraone(T-PPh-PTO)organic cathode material was designed and synthesized based on the concentration-gradient of the precursor(PTO-Br2)and asymmetrical internal diffusion during the reaction.The unique hollow structure endowed T-PPh-PTO with a short Li+diffusion path accompanied by a high diffusion Li+coefficient(D≈10−8 cm^(2)·s^(−1)).Thus,T-PPh-PTO presented a capacitance-dominated redox pseudocapacitance action with an outstanding rate performance(173 mAh·g^(−1)at 2 A·g^(−1))and high cycle stability(capacity retention ratio is 91.7%after 2,000 cycles).Our study leads to further developments in designing unique organic structures for energy storage.

关键词： conjugated organic polymer hollow tubular structure lithium batteries ionic migration

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Boosting efficiency and stability of 2D alternating cation perovskite solar cells via rational surface-modification: Marked passivation efficacy of anion

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Journal of Energy Chemistry 2023年第9期84卷 354-362页

作者： Hualin Zheng Xuefeng Peng Tingxi Chen Ting Zhang Shihao Yuan Lei Wang Feng Qian Jiang Huang Xiaodong Liu Zhi David Chen Yanning Zhang Shibin Li State Key Laboratory of Electronic Thin Films and Integrated Devices and School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054SichuanChina Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China(UESTC)Chengdu 610054SichuanChina Department of Electrical&Computer Engineering and Center for Nanoscale Science&EngineeringUniversity of KentuckyLexingtonKY 40506USA Institute of Electronic and Information Engineering of UESTC in Guangdong Dongguan 523808GuangdongChina

Two-dimensional(2D) alternating cation(ACI) perovskite surface defects,especially dominant iodine vacancies(V_Ⅰ) and undercoordinated Pb^(2+),limit the performance of perovskite solar cells(PVSCs).To address the issue,1-butyl-3-methylimidazolium trifluoro-methane-sulfonate(BMIMOTF) and its iodide counterpart(BMIMI) are utilized to modify the perovskite surface respectively.We find that BMIMI can change the perovskite surface,whereas BMIMOTF shows a nondestructive and more effective defect passivation,giving significantly reduced defect density and suppressed charge-carrier nonradiative recombination.This mainly attributes to the marked passivation efficacy of OTF-anion on V_Ⅰ and undercoordinated Pb^(2+),rather than BMIMI^(+) cation.Benefiting from the rational surface-modification of BMMIMOTF,the films exhibit an optimized energy level alignment,enhanced hydrophobicity and suppressed ion migration.Consequently,the BMIMOTF-modified devices achieve an impressive efficiency of 21.38% with a record open-circuit voltage of 1.195 V,which is among the best efficiencies reported for 2D PVSCs,and display greatly enhanced humidity and thermal stability.

关键词： 2D ACI perovskite solar cells Charge-carrier nonradiative recombination Surface defects passivation Energy level alignment ionic migration Stability

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Influence of DC Current on Corrosion Behaviour of Copper–Aluminium Composite Plates

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Acta Metallurgica Sinica(English Letters) 2021年第8期34卷 1142-1152页

作者： Yu-Lin Cheng Xiao-Jiao Zuo Xiao-Guang Yuan Hong-Jun Huang Yi-Fan Zhang School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

In this study, neutral salt spray accelerated corrosion test of copper–aluminium composite under 0–125 A DC current was carried out under 5% concentration. The effect of corrosion behaviour on copper–aluminium composite by DC current was carried out by a scanning electron microscope(SEM) with energy-dispersive spectroscopy(EDS), X-ray diffraction(XRD) patterns, X-ray photoelectron spectroscopy(XPS), weight-loss method and electrochemical analysis. The results show that the current can accelerate the corrosion rate. Meanwhile, the current temperature effect can reduce the corrosion rate. The current caused directional migration of ions resulting in different corrosion products on positive and negative poles of specimen, and the corrosion degree on the positive pole was more serious. The galvanic corrosion mechanism at the copper–aluminium interface is different from the pitting corrosion mechanism far away from the interface, and the latter is more affected by DC current.

关键词： Copper–aluminium composite Corrosion DC current ionic migration Temperature effect

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