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Bismuth doped lead-free two-dimensional tin based halide perovskite single crystals

Journal of Energy Chemistry 2019年第9期28卷 1-6页

作者： Ruiling Zhang Xin Mao Pengfei Cheng Yang Yang Songqiu Yang Tuerdi Wumaier Weiqiao Deng Keli Han State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China University of the Chinese Academy of Sciences Beijing 100049 China Department of Physics Xinjiang Institute of EngineeringUrumqi 830091 Xinjiang China

Heterovalent-metal doping is an efficient tool to tune the optoelectronic properties of the famous halide *** studies have focused on the heterovalent-doping in three-dimensional(3D) halide ***, there is a lack of such doping in two-dimensional perovskites which possess unique optoelectronic properties and improved chemical stability as compared to 3D ***, we present successful doping of Bismuth into the lattice of lead-free, two-dimensional perovskite PEA2SnBr4 single *** characterizations demonstrate that the doped crystals possess identical crystal structure and layered morphology with the pristine ***, we find the PL peak and spectral shape can be tailored by tuning the concentration of Bi *** transient absorption spectroscopy is performed to understand the underlying mechanism related to tunable PL behaviors, and a clear picture of the Bismuth-doping impact is provided.

关键词： Heterovalent-metal doping Photoluminescence Self-trapped excitons Femtosecond transient absorption spectra Global analysis fit

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Embedding Co3O4 nanoparticles into graphene nanoscrolls as anode for lithium ion batteries with superior capacity and outstanding cycling stability

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Progress in Natural Science:Materials International 2018年第2期28卷 212-217页

作者： Zhigang Zhang Lianlian Gao Yanfeng Dong Jinping Zhao Zhongshuai Wu School of chemistry & chemical engineering Shandong University of Technology Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences

CoOis a promising high-performance anode for lithium ion batteries(LIBs), but suffers from unsatisfied cyclability originating duo to low electrical conductivity and large volume expansion during charge and discharge process. Herein, we successfully constructed the CoOnanoparticles embedded into graphene nanoscrolls(GNSs) as advanced anode for high-performance LIBs with large capacity and exceptional cyclability. The onedimensional(1 D) CoO/GNSs were synthesized via liquid nitrogen cold quenching of large-size graphene oxide nanosheets and sodium citrate(SC) modified CoOnanoparticles, followed by freeze drying and annealing at400 °C for 2 h in nitrogen atmosphere. Benefiting from the interconnected porous network constructed by 1 D CoO/GNSs for fast electron transfer and rapid ion diffusion, and wrinkled graphene shell for significantly alleviating the huge volume expansion of CoOduring lithiation and delithiation. The resultant CoO/GNSs exhibited ultrahigh reversible capacity of 1200 mAh gat 0.1 C, outperforming most reported ***, they showed high rate capability of 600 m Ah g-1 at 5 C, and outstanding cycling stability with a high capacity retention of 90% after 500 cycles. Therefore, this developed strategy could be extended as an universal and scalable approach for intergrating various metal oxide materials into GNSs for energy storage and conversion applications.

关键词： Graphene nanoscrolls Co3O4 Anode Lithium ion batteries Energy storage

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Pd1/CeO2 single-atom catalyst for alkoxycarbonylation of aryl iodides

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Science China Materials 2020年第6期63卷 959-964页

作者： Fang Chen Tianbo Li Xiaoli Pan Yalin Guo Bing H an Fei Liu Botao Qiao Aiqin W ang Tao Zhang CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China Dalian National Laboratory for Clean Energy Dalian 116023China

Heterogenization of the homogeneous catalysis has been studied for almost 50 ***-atom catalysis has the advantages of both homo-and heterogeneous *** has been proposed,and subsequently experimentally verified that single-atom catalysis is able to bridge homo-and heterogeneous catalysis,thus providing a new avenue to realize the heterogenization of homogeneous *** of aryl halides is an effective method for the direct synthesis of carboxylic acid derivatives,and is commonly catalyzed by Pd-based homogeneous complexes with N/P-containing ligands and organic/inorganic ***,we firstly reported that Pd1/CeO2 single-atom catalyst showed good performance in the alkoxycarbonylation of aryl iodides *** base-free and ligand-free conditions,Pd1/CeO2 single-atom catalyst can transfer different aryl iodides to corresponding *** catalyst can be easily recovered and reused four times without significant loss of reactivity.

关键词： single-atom catalyst alkoxycarbonylation Pd1/CeO2 heterogenization base-free

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Synergy effects on Sn-Cu alloy catalyst for efficient CO2 electroreduction to formate with high mass activity

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Science Bulletin 2020年第9期65卷 711-719,M0003页

作者： Ke Ye Ang Cao Jiaqi Shao Gang Wang Rui Si Na Ta Jianping Xiao Guoxiong Wang State Key Laboratory of Catalysis Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Shanghai Synchrotron Radiation Facility Zhangjiang LaboratoryShanghai 201204China

To acquire the synergy effects between Sn and Cu for the jointly high Faradaic efficiency and current density,we develop a novel strategy to design the Sn-Cu alloy catalyst via a decorated co-electrodeposition method for CO2 electroreduction to *** Sn-Cu alloy shows high formate Faradaic efficiency of 82.3%±2.1% and total C1 products Faradaic efficiency of 90.0%±2.7% at^-1.14 V *** hydrogen electrode(RHE).The current density and mass activity of formate reach as high as(79.0±0.4)mA cm^-2 and(1490.6±7.5)m A mg^-1 at^-1.14 V *** calculations suggest that Sn-Cu alloy can obtain high Faradaic efficiency for CO2 electroreduction by suppressing the competitive hydrogen evolution reaction and that the formate formation follows the path of CO2→HCOO*→*** stepped(211)surface of Sn-Cu alloy is beneficial towards selective formate production.

关键词： Electrochemical carbon dioxide reduction reaction Synergy effects Sn-Cu alloy Mass activity Formate

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