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The contribution of solid-state chemistry in the determination of multicomponent phase diagrams

Rare Metals 2006年第5期25卷 576-581页

作者： Jean Claude Tedenac Franck Gascoin Didier Ravot Université Montpellier 2 LPMC-UMR-CNRS-5617 MontpellierFrance

For a long period of time, the determination of phase diagrams was only supported by experiments related to thermal effects or thermodynamic measurements： thermal analysis, calorimetric measurements, vapor pressures, and EMF measurements. As a matter of fact, solid-solid transformations were not so accurately determined and could not be taken into account in the system＇s analysis. First, X-ray diffraction methods were used as a support for the thermal analysis. Second, the implementation of novel tools in structural analysis （for example, the Rietveld method） has permitted to increase the knowledge of phase stability. Finally, modeling the phases using a Calphad method needed increasingly more structural results to determine and better understand the phase diagrams. On the other hand, the Calphad method has been widely developed for metallic systems, for oxide systems, and in the past 10 years, for some semi-conductor systems, for example, gallium arsenide, cadmium telluride, and lead telluride systems. In such applications, it is very important to bring point defects in the modeling of the phases to map the defects as a function of the chemical composition. Owing to its complexity, this characteristic, the knowledge of which is crucial for the understanding and the control of potential physical applications, was ignored in the previous assessment of semi-conductor systems.

关键词： thermodynamic modeling solid-state chemistry phase diagram

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Facile preparation of organometallic perovskite films and high-efficiency solar cells using solid-state chemistry

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Nano Research 2015年第1期8卷 263-270页

作者： Lei Chen Feng Tang Yixin Wang Shan Gao Weiguo Cao Jinhua Cai Liwei Chen Department of chemistry Shanghai University Shanghai 200444 China i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou Jiangsu 215123 China Nano Science and Technology Institute University of Science and Technology of China Suzhou Jiangsu 215123 China

The power conversion efficiency of organometallic perovskite-based solar cells has skyrocketed in recent years. Intensive efforts have been made to prepare high-quality perovskite films tailored to various device configurations. Planar heterojunction devices have achieved record efficiencies; however, the preparation of perovskite films for planar junction devices requires the use of expensive vacuum facilities and/or the fine control of experimental conditions. Here, we demonstrate a facile preparation of perovskite films using solid-state chemistry. solid-state precursor thin films of CHBNH3I and PbI2 are brought into contact with each other and allowed to react via thermally accelerated diffusion. The resulting perovskite film displays good optical absorption and a smooth morphology. Solar cells based on these films show an average efficiency of 8.7% and a maximum efficiency of 10%. The solid-state synthesis of organometallic perovskite can also be carried out on flexible plastic substrates. Using this method on a PET/ITO substrate produces devices with an efficiency of 3.2%. Unlike existing synthetic methods for organometallic perovskite films, the solid-state reaction method does not require the use of orthogonal solvents or careful adjustment of reaction conditions, and thus shows good potential for mass production in the future.

关键词： solid-state chemistry perovskite solar cells planar heterojunction flexible substrates

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NaSICON:A promising solid electrolyte for solid-state sodium batteries

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Interdisciplinary Materials 2022年第3期1卷 396-416页

作者： Chi Li Rui Li Kaining Liu Rui Si Zhizhen Zhang Yong-Sheng Hu School of Materials Sun Yat-Sen UniversityGuangzhouGuangdongPR China New Energy Equipment Division China Southern Power Grid Technology Co.Ltd.GuangzhouGuangdongPR China Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijingPR China College of Materials Sciences and Opto-Electronic Technology University of Chinese Academy of SciencesBeijingPR China

A surge of interest has been brought to all-solid-state batteries(ASSBs)as they show great prospects for enabling higher energy density and improved safety compared to conventional liquid *** Super Ionic CONductors(NaSICONs)proposed by Goodenough and Hong in 1976 are the most promising materials class for Nabased ASSBs owing to their excellent ion conductivity(>1mS cm−1),high thermal and chemical/electrochemical stability,as well as good chemical/electrochemical compatibility with electrode *** major challenge facing NaSICONtype electrolytes is the generally high interfacial resistance and thus sluggish charge transfer kinetics across the NaSICON/cathode *** endeavors in the past few years have led to progress in the improvement of the ion-conducting property,and a dramatic decrease in the NaSICON/electrode interface *** cycling performance and rate capability have been achieved through interface *** this review article,we summarize the state-of-theart findings for various derivatives of NaSICON structured solid electrolytes,with the aim of providing a deeper understanding of the underlying mechanism for the improvement of ion conductivity,and the intrinsic reasons for the enhanced interface charge transfer *** strategies can be readily extended to other solid *** hope this review will inspire more work on NaSICONtype solid electrolytes and solid-state batteries.

关键词： batteries&fuel cells chemistry materials science solid-state chemistry

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