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Preyssler-type heteropoly acid:A new,mild and efficient catalyst for protection of carbonyl compounds

Chinese Chemical Letters 2011年第4期22卷 435-438页

作者： Mohammad Rahimizadeh Tahmineh Bazazan Ali Shiri Mehdi Bakavoli Hassan Hassani Department of Chemistry School of SciencesFerdowsi University of Mashhad91775-1436 MashhadIran Department of Chemistry Payam Noor UniversityBirjandIran

Preyssler-type heteropoly acid is introduced as a new,mild and efficient catalyst for protection of a variety of carbonyl compounds with 1,3-propane dithiol.

关键词： Preyssler-type heteropoly acid Protection carbonyl groups 1 3-Propanedithiol

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Improved crystallinity and self-healing effects in perovskite solar cells via functional incorporation of polyvinylpyrrolidone

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Journal of Energy Chemistry 2022年第5期31卷 12-18页

作者： Yunjuan Niu Dingchao He Zhengguo Zhang Jun Zhu Tulloch Gavin Polycarpos Falaras Linhua Hu Key Laboratory of Photovoltaic and Energy Conservation Materials Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031AnhuiChina University of Science and Technology of China Hefei 230026AnhuiChina School of Chemistry and Chemical Engineering North Minzu UniversityYinchuan 750021NingxiaChina Special Display and Imaging Technology Innovation Center of Anhui Province Anhui Province Key Laboratory of Measuring Theory and Precision InstrumentAcademy of Opto-Electric TechnologyHefei University of TechnologyHefei 230009AnhuiChina National Center for Scientific Research‘‘Demokritos” Institute of Nanoscience and Nanotechnology(INN)15310 Agia Paraskevi AttikisAthensGreece Greatcell Energy 280 Byrnes RdWagga WaggaNSW 2650Australia

Air moisture is the key issue for perovskites which invades the films and accelerates the damage of devices. Here, polyvinylpyrrolidone(PVP) is introduced to the methylammonium lead iodide(MAPbI_(3)) perovskite precursor to control crystal growth and endow the devices with self-healing ability in a moisture environment. The strong C=O...ΗAΝ hydrogen bonding interactions between PVP and MAPbI_(3) was confirmed by nuclear magnetic resonance measurements. By introducing hydrogen bonding in the MAPbI_(3)-based PSCs, we form a compact perovskite film of excellent electronic quality with a power conversion efficiency(PCE) of up to 20.32%. Furthermore, the O...ΗAΝ hydrogen bonding interactions at the grain boundaries suppress the decomposition of methylammonium cations and improve the recyclable dissolution–recrystallization of perovskite. As a result, the MAPbI_(3)-PVP based cells exhibited striking moisture stability and self-healing behavior, with negligible decay in efficiency after 500 h of operation in high humidity(65% ± 5% relative humidity) and rapid recovering ability after their removal from the humid environment.

关键词： Perovskite solar cells Self-healing carbonyl groups Hydrogen bonding

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