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calcium-Doped Boron Nitride Aerogel Enables Infrared Stealth at High Temperature Up to 1300℃

Nano-Micro Letters 2022年第1期14卷 295-306页

作者： Mengya Zhu Guangyong Li Wenbin Gong Lifeng Yan Xuetong Zhang School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026People’s Republic of China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123People’s Republic of China School of Physics and Energy Xuzhou University of TechnologyXuzhou 221018People’s Republic of China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026People’s Republic of China Division of Surgery&Interventional Science University College LondonLondon NW32PFUK

Boron nitride(BN)aerogels,composed of nanoscale BN building units together with plenty of air in between these nanoscale building units,are ultralight ceramic materials with excellent thermal/electrical insulation,great chemical stability and high-temperature oxidation resistance,which offer considerable advantages for various applications under extreme ***,previous BN aerogels cannot resist high temperature above 900℃ in air atmosphere,and hightemperature oxidation resistance enhancement for BN aerogels is still a great ***,a calcium-doped BN(Ca-BN)aerogel with enhanced high-temperature stability(up to~1300℃ in air)was synthesized by introducing Ca atoms into crystal structure of BN building blocks via high-temperature reaction between calcium phosphate and melamine diborate *** Ca-BN aerogels could resist the burning of butane flame(~1300℃)and keep their megashape and microstructure very ***,Ca-BN aerogel serves as thermal insulation layer,together with Al foil serving as both low-infrared-emission layer and high-infrared-reflection layer,forming a combination structure that can effectively hide high-temperature target(heated by butane flame).Such successful chemical doping of metal element into crystal structure of BN may be helpful in the future design and fabrication of advanced BN aerogel materials,and further extending their possible applications to extremely high-temperature environments.

关键词： Aerogel Boron nitride calcium doping Infrared stealthy Butane flame

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Preparation of tortuous three-dimensional γ-CsPbI3 films at low temperature by CaI2 as dopant for highly efficient perovskite solar cells

Preparation of tortuous three-dimensional γ-CsPbI3 films at...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： Hang Zhao Jia Xu Jianxi Yao State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing Key Laboratory of Energy Safety and Clean Utilization North China Electric Power University

In this study, it has been found that the tortuous three-dimensional CsPbI phase(γ-CsPbI) can be prepared and used for PSCs by solution process without any additive at low temperature(60 ℃). The γ-CsPbI exhibits suitable bandgap of 1.75 eV and favorable photoelectric properties. However, γ-CsPbI is a metastable phase and easily transform into β-CsPbI in moist ambient. In order to improve the stability of γ-CsPbI, calcium ion(Ca) with a relatively small radius of 100 pm is used to partially substitute the lead ion(119 pm). This research proves that Ca could effectively improve the stability of the γ-CsPbI at room temperature. By optimizing the doping concentration of Ca(CsPbCaI, x is from 0 to 2%), the Ca-doped γ-CsPbI PSCs achieves a hysteresis-free J-V curve and a maximum PCE of 9.20%.

关键词： low-temperature synthesis tortuous cubic phase calcium doping enhanced stability hysteresis-free

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