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Hole transport layer-free inverted perovskite solar cells with power conversion efficiency exceeding 25%and much improved stability

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Science China Materials 2023年第7期66卷 2947-2948页

作者： Nicholas Adams Guozhong Cao Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120USA

Organic-inorganic hybrid perovskites possess a unique combination of excellent electronic and photoelectrochemical properties that can be readily tailored by partial or complete substitution of their constituent elements owing to their nonclose packing anion lattice[1,2].Perovskite solar cells(PSCs)employing hybrid perovskites as an active layer have seen rapid improvements and have achieved high power conversion efficiencies(PCEs)now exceeding 25%[2].

关键词： perovskite exceeding layer

Lead-free organic-inorganic halide perovskites grown with nontoxic solvents

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Science Bulletin 2017年第13期62卷 901-902页

作者： Guozhong Cao Department of Materials Science and Engineering University of Washington

A Perovskite is any material with the same type of crystal structure of CaTiO_3,a mineral discovered in 1839[1],with the chemical formula of ABX_3,where A and B are two cations and X is an anion.Inorganic metal trihalide perovskites,CsPbX_3(X=Cl,Br,and I),were synthesized almost 60 years later by reacting PbX_2 and CsX salts in aqueous solutions[2].In the ideal cubic-symmetry structure,the A ions in 12-fold cuboctahedral coordination are much larger than the B ions in 6-fold octahedral coordination.Because perovskite does not possess a close packed anion sub-lattice

关键词：层状钙钛矿有机-无机卤化物配位多面体生长溶剂无毒无铅

Atomic level understanding of the nanoscale Kirkendall effect

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Science Bulletin 2017年第12期62卷 818-819页

作者： Guozhong Cao Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120USA

Exactly 70 years after Kirkendall’s revolutionary experiments established the vacancy diffusion mechanism and the resultant Kirkendall effect and Kirkendall pores[1],Sun et al.[2]advanced the understanding of the Kirkendall effect to near atomic level with the real-time tracking three-dimensional(3D)evolution of colloidal nanoparticles under real reaction conditions.Smigelskas and Kirkendall[1]in 1947 reported an experiment on the interdiffusion between copper and zinc in a

关键词： Kirkendall效应纳米尺度原子水金纳米粒子扩散机制反应条件实时跟踪

Weakly Polarized Organic Cation-Modified Hydrated Vanadium Oxides for High-Energy Efficiency Aqueous Zinc-Ion Batteries

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Nano-Micro Letters 2024年第7期16卷 169-186页

作者： Xiaoxiao Jia Chaofeng Liu Zhi Wang Di Huang Guozhong Cao Department of Materials Science and Engineering University of WashingtonSeattleWA 98195USA School of Materials Science and Engineering Tongji UniversityShanghai 201804People’s Republic of China

Vanadium oxides,par-ticularly hydrated forms like V_(2)O_(5)·nH_(2)O(VOH),stand out as promising cathode candidates for aqueous zinc ion batteries due to their adjustable layered structure,unique electronic characteristics,and high theoretical capacities.However,challenges such as vanadium dissolution,sluggish Zn^(2+)diffusion kinetics,and low operating voltage still hinder their direct application.In this study,we present a novel vanadium oxide([C_(6)H_(6)N(CH_(3))_(3)]_(1.08)V_(8)O_(20)·0.06H_(2)O,TMPA-VOH),developed by pre-inserting trimethylphenylammonium(TMPA+)cations into VOH.The incorporation of weakly polarized organic cations capitalizes on both ionic pre-intercalation and molecular pre-intercalation effects,resulting in a phase and morphology transition,an expansion of the interlayer distance,extrusion of weakly bonded interlayer water,and a substantial increase in V^(4+)content.These modifications synergistically reduce the electrostatic interactions between Zn^(2+)and the V-O lattice,enhancing structural stability and reaction kinetics during cycling.As a result,TMPA-VOH achieves an elevated open circuit voltage and operation voltage,exhibits a large specific capacity(451 mAh g^(-1)at 0.1 A g^(-1))coupled with high energy efficiency(89%),the significantly-reduced battery polarization,and outstanding rate capability and cycling stability.The concept introduced in this study holds great promise for the development of high-performance oxide-based energy storage materials.

关键词： Zinc-ion battery Vanadium oxide V_(2)O_(5)·nH_(2)O Pre-intercalation Interlayer engineering

Superior efficiency and stability of YbO-enhanced perovskite solar cells

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Science China Materials 2024年

作者： Qifeng Zhang Guozhong Cao Department of Materials Science and Engineering University of Washington Department of Electrical and Computer Engineering North Dakota State University

Perovskite solar cells represent a revolutionary class of photovoltaic devices that have gained substantial attention for their exceptional performance and potential to provide an affordable and efficient solution for harnessing solar energy. These cells utilize perovskite-structured materials, typically hybrid organicinorganic lead halide compounds, as the light-absorbing layer.

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Superior efficiency and stability of YbO_(x)-enhanced perovskite solar cells

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Science China Materials 2024年第4期67卷 1356-1358页

作者： Qifeng Zhang Guozhong Cao Department of Electrical and Computer Engineering North Dakota State UniversityFargoND 58108-6050USA Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120USA

关键词： energy perovskite stability

Solvent-salt synergy offers a safe pathway towards next generation high voltage Li-ion batteries

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Science China Materials 2018年第10期61卷 1360-1362页

作者： Guozhong Cao Department of Materials Science and Engineering University of Washington

Driven by expanding applications in mobile electronics,grid storage,and electric vehicles,the global lithium-ion battery market is projected to reach>45 billion dollars by2022[1].While each of these applications has a... 详细信息

关键词：电解质锂电池电池行业技术创新

Increased working voltage of hexamine-coated porous carbon for supercapacitors

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Science Bulletin 2015年第18期60卷 1587-1597页

作者： Stephanie L.Candelaria Guozhong Cao Department of Materials Science and Engineering University of Washington

Highly porous carbon, both unmodified and hexamine-coated on the pore surfaces, is tested at high working voltages in organic electrolyte for supercapacitors in order to enhance the energy density and power density.Sol–gel processing allows for excellent control of the porous structure and chemical composition of carbon,resulting in a material with high surface area and a low level of impurities. This porous carbon can be modified using a simple solution-based method to enhance capacitance. Increasing the working voltage from 2.0 to 3.0 V significantly improves performance for both unmodified and hexamine-coated carbon. The energy density and power density increase at higher working voltage, and under certain conditions, the capacitance increases as well.Cyclic stability is also investigated, with hexamine-coated carbon retaining more of its initial capacitance than unmodified carbon at all working voltages.

关键词：超级电容器工作电压乌洛托品多孔碳高能量密度功率密度有机电解液化学组合物

Creative design inspired by biological knowledge:Technologies and methods

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Frontiers of Mechanical Engineering 2019年第1期14卷 1-14页

作者： Runhua TAN Wei LIU Guozhong Cao Yuan SHI School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China National Engineering Research Center for Technological Innovation Method and Tool Hebei University of TechnologyTianjin 300401China Department of Mechanical Engineering Politecnico di Mila noMilan 20156Italy

Biological knowledge is becoming an important source of inspiration for developing creative solutions to engineering design problems and even has a huge potential in formulating ideas that can help firms compete successfully in a dynamic market.To identify the technologies and methods that can facilitate the development ofbiologically inspired creative designs,this research briefly reviews the existing biological-knowledge-based theories and methods and examines the application of biological-knowledge-inspired designs in various fields.Afterward,this research thoroughly examines the four dimensions of key technologies that underlie the biologically inspired design(BID)process.This research then discusses the future development trends of the BID process before presenting the conclusions.

关键词： creative design biologically inspired methods key technologies