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Understanding De-protonation Induced Formation of Spinel Phase in Li-rich Layered Oxides for Improved Rate Performance

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Chinese Journal of Structural Chemistry 2018年第11期37卷 1723-1736页

作者：李保云李广社张丹范建明冯涛李莉萍 State Key Laboratory of Inorganic Synthesis & Preparative Chemistry Jilin University Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

Constructing layered-spinel composites is important to improve the rate performance of lithium-rich layered ***,up to now,the effect of microstructure of composites on the rate performance has not been well *** this study,a series of samples were prepared by a simple protonation and de-protonation for the pristine layered material(LiMnNiCoO)obtained by sol-gel *** characterizations of XRD,Raman and oxidation-reduction potentials of charge-discharge curves demonstrated that these samples after de-protonation are layered-spinel *** these composites were tested as a cathode of lithium-ion batteries,the sample treated with 0.1 M of nitric acid exhibited higher discharge capacities at each current density than that of other *** outstanding rate performance is attributed to the high concentration of conduction electron resulting from the low average valence state(44.2%of Ni)as confirmed by its high conductivity(1.124×10??mat39800Hz)and ambient temperature magnetic susceptibility(8.40×10emu/Oe?mol).This work has a guiding significance for the synthesis of high rate performance of lithium battery cathode materials.

关键词： protonation and de-protonation layered-spinel composites rate performance conduction electron

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S-scheme heterojunction of CeVO 4 /Zn 0.1 Cd 0.9 S for enhanced photocatalytic hydrogen evolution

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Journal of Rare Earths 2025年

作者： Chaoyue Zheng Teng Li Youlin Wu Jihuai Wu Canzhong Lu Yiming Xie Engineering Research Center of Environment-Friendly Functional Materials Ministry of Education Institute of Materials Physical Chemistry Huaqiao University Xiamen 361021 China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Center of Rare-earth Materials Haixi Institutes Chinese Academy of Sciences Xiamen 361021 China University of Toyama–Gofuku Campus Department of Applied Chemistry Gofuku Toyama 930−8555 Japan CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China University of Chinese Academy of Sciences Beijing 100049 China

The process of utilizing solar-driven semiconductor water splitting for the production of hydrogen is a vital strategy in the pursuit of a zero-carbon economy. Zn 0.1 Cd 0.9 S, a rod-like semiconductor metal sulfide, encounters considerable difficulties stemming from the swift recombination of charge carriers generated by light. Overcoming the coulombic interactions between charge carriers is essential for achieving efficient separation. In this study, we modified Zn 0.1 Cd 0.9 S with dodecahedral rare-earth compound CeVO 4 and employed ultrasonic self-assembly to tightly couple the two materials. This integration established a built-in electric field and constructed an S-scheme heterojunction. Within this configuration, Zn 0.1 Cd 0.9 S serves as an electron acceptor while CeVO 4 functions as an electron donor. Driven by the built-in electric field, electrons rapidly traverse the tightly coupled interface, minimizing their path length. The S-scheme heterojunction preserves the catalyst’s strong redox capabilities and facilitates the vectorial separation of photogenerated charge carriers. In situ irradiated X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) analyses further validated the charge transfer mechanism of the S-scheme heterojunction. Density functional theory calculations elucidated the electronic states and roles of the catalyst, thereby establishing a theoretical framework for the investigation of S-scheme heterojunctions. This work lays a theoretical basis for the design and mechanistic investigation of S-scheme heterojunction catalysts.

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Corrigendum to “NaNO 3 assisted gelatin-derived multi-level porous carbon aerogel loaded Fe single-atom for high efficient oxygen reduction reaction” [Appl. Catal. B: Environ. 331 (2023) 122685]

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Applied Catalysis B: Environment and Energy 2024年 344卷

作者： Tao Wu Shufei Zhu Yiming Xie Qian Ma Canzhong Lu Engineering Research Center of Environment-Friendly Functional Materials Ministry of Education Institute of Materials Physical Chemistry Huaqiao University Xiamen 361021 PR China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Center of Rare-earth Materials Haixi Institutes Chinese Academy of Sciences Xiamen 361021 PR China Research Center of Medical Sciences Guangdong Provincial People’s Hospital Guangzhou Guangdong 510080 PR China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 PR China

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designing of covalent organic framework/2D g-C 3 N 4 heterostructure using a simple method for enhanced photocatalytic hydrogen production

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Journal of Colloid and Interface Science 2024年 653卷 1650-1661页

作者： Ahmed E. Hassan Ahmed M. Elewa Mai S.A. Hussien Ahmed F.M. EL-Mahdy Islam M.A. Mekhemer Ibrahim S. Yahia Tarek A. Mohamed Ho-Hsiu Chou Zhenhai Wen CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China University of Chinese Academy of Sciences Beijing 100049 China Department of Chemistry Faculty of Science Al-Azhar University Nasr City 11884 Cairo Egypt Department of Chemical Engineering National Tsing Hua University Hsinchu 300044 Taiwan Nuclear Chemistry Department Hot Laboratories Center Atomic Energy Authority Cairo 13759 Egypt Nanoscience Laboratory for Environmental and Biomedical Applications (NLEBA) Semiconductor Lab Department of Physics Faculty of Education Ain Shams University Roxy Cairo 11757 Egypt Department of Chemistry Faculty of Education Ain Shams University Roxy Cairo 11757 Egypt Department of Materials and Optoelectronic Science National Sun Yat-Sen University Kaohsiung 80424 Taiwan Laboratory of Nano-Smart Materials for Science and Technology (LNSMST) Department of Physics Faculty of Science King Khalid University P.O. Box 9004 Abha Saudi Arabia Research Center for Advanced Materials Science (RCAMS) King Khalid University Abha 61413 P.O. Box 9004 Saudi Arabia Center of Medical and Bio-Allied Health Sciences Research (CMBHSR) Ajman University Ajman P.O. Box 346 United Arab Emirates

designing heterostructure photocatalysts is a promising approach for developing highly efficient photocatalysts for hydrogen energy production. In this work, we synthesized a series of a covalent organic framework (COF)/g-C 3 N 4 (CN) heterojunction photocatalysts, denoted as x % COF/CN (in which x indicates the weight % of COF and x = 5, 10, 20, 30, 40, 50, 90, 95, 100), for hydrogen production . The COF, which is a key component of the photocatalyst, was prepared by assembling benzothiadiazole (BT) and pyrene (Py) derivatives as building blocks. Integrating COF rods into the two-dimensional (2D) layered g-C 3 N 4 structure significantly improved photocatalytic H 2 production. The hybrid system (30 % COF/CN) displayed an outstanding hydrogen evolution rate (HER) of 27540 ± 805 μmol g −1 h −1 , outperforming most known COFs and g-C 3 N 4 -based photocatalysts, besides exhibiting stable photocatalytic performance. Moreover, the apparent quantum yield (AQY) was 15.5 ± 0.8 % at 420 nm. Experimental techniques and density functional theory (DFT) calculations demonstrated that the 30 % COF/CN heterostructure has broad visible-light absorption, adequate band energy levels, and the best chemical reactivity descriptors compared to the individual components, resulting in effective carrier separation and excellent performance. Our findings offer a valuable strategy for developing highly efficient and stable heterojunction photocatalysts for visible-light‐driven H 2 evolution.

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Precipitation transformation of rare earth sulfate into chloride with p-dodecylphenoxy carboxylic acids

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Journal of Rare Earths 2019年第12期37卷 1326-1333页

作者： Yanliang Wang Jia Su Xiangguang Guo Jianguo Cui Yan Bai Fujian Li Xiaoqi Sun CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100039China Baotou Research Institute of Rare Earths Baotou 014010China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Ganzhou Rare Earth Group Co. Ltd.Ganzhou 34WOOChina

Methods for transforming rare earth(RE)sulfate into chloride mainly include extraction process with organophosphonic mono-acids or aliphatic acids and precipitation process with ammonium bicarbonate(NH4 HCO3).In this paper,alkylphenoxy carboxylic acids(HAs)ofp-dodecylphenoxy acetic acid(HA-Ⅰ),pdodecylphenoxypropanoic acid(HA-Ⅱ)and p-dodecylphenoxybutyric acid(HA-Ⅲ),which were liquid at room temperature were synthesized and *** precipitation mechanisms of RE elements with the HAs were investigated and the HA/RE molar ratios of the solid complexes were determined as3:1 by equi-molar series method which accord with the principle of charge *** of HAs for the transformation of RE sulfate from concentrated sulfuric acid roasted RE concentrate into chloride via precipitation method was discussed.100%HA-Ⅱwas selected as the liquid organic precipitant without dilution of volatile solvent soracceleration of phase separation by *** RE sulfate solution can be precipitated by HA-Ⅱafter neutralization with liquid NaOH and stripped with concentrated HCl at room *** concentration of RE chloride of 218.1 g/L with low residue of sulfate radical of 0.536 g/L was *** residual organic precipitant in the raffinate solution was tested to be lower than 8 mg/L at 25℃and the chemical oxygen demand(COD)in wastewater was less than 50 mg/L.

关键词： Rare earth Dodecylphenoxycarboxylic acid Recovery Precipitation Transformation

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Synthesis,Crystal Structure and Photophysical Property of 2-(9H-carbazol-9-yl)-3-(2-(2,4,5-tri-(9H-carbazol-9-yl)-3,6-dicyanophenoxy)phenoxy)dibenzo[b,e]dioxine-1,4-dicarbonitrile

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Chinese Journal of Structural Chemistry 2018年第9期37卷 1433-1439页

作者：董亚芳余荣民卢灿忠 College of Chemistry Fuzhou University CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

A purely organic compound 2-（9 H-carbazol-9-yl）-3-（2-（2,4,5-tri-（9 H-carbazol-9-yl）-3,6-dicyanophenoxy）phenoxy）dibenzo[b,e][1,4]dioxine-1,4-dicarbonitrile, C76 H40 N8 O4, was synthesized and characterized by NMR, UV-Vis, photoluminescenceand X-ray single-crystal structure analysis. The compound crystallizes in monoclinic system, space group P21/n with a = 11.6537（3）, b = 34.9738（8）, c = 15.5053（3）？, β =101.992（2）°, V = 6181.6（2）？3, Z = 4, Mr= 1129.18 g/mol, Dc =1.396 g/cm3, F（000） =2672, μ = 2.239 mm–1, GOOF = 1.019, the final R = 0.0577 and wR= 0.1559 for 11925 observed reflections with I 〉2σ（I）. The UV-vis absorption and fluorescence of the compound were discussed. The compound exhibitsyellow-green luminescence with maximum emission peak at 538 nm, and quantum yields of ф = 0.25 and 0.48 in air-equilibrated and degassed toluene at room temperature. Transient decay spectral studies show that compound 1 displays two component decay fashions with a short decay lifetime of 23 ns for the prompt fluoresce anda long decay lifetime of 3.8ms for thermally activated delayed fluorescence. In air-equilibrated toluene, only a short decay lifetime of 17 ns was *** experimental and computational results show thatthe emission of the compound originates from the CT excited states.

关键词： purely organic compound synthesis crystal structure luminescence DFT calculation

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A New Class of NIR-II Gold Nanocluster-Based Protein Biolabels for In Vivo Tumor-Targeted Imaging

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Angewandte Chemie (International ed. in English) 2021年第3期60卷 1306-1312页

作者： Xiaorong Song Wei Zhu Xiaoguang Ge Renfu Li Shihua Li Xian Chen Jibin Song Jianping Xie Xueyuan Chen Huanghao Yang MOE Key Laboratory for Analytical Science of Food Safety and Biology & State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University Fuzhou Fujian 350116 China. Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China. CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China. Department of Chemical and Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 Singapore 117585 Singapore. Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou Fujian 350207 China.

The design of bright NIR-II luminescent nanomaterials that enable efficient labelling of proteins without disturbing their physiological properties in vivo is challenging. We developed an efficient strategy to synthesize bright NIR-II gold nanoclusters (Au NCs) protected by biocompatible cyclodextrin (CD). Leveraging the ultrasmall size of Au NCs (<2 nm) and strong macrocycle-based host-guest chemistry, the as-synthesized CD-Au NCs can readily label proteins/antibodies. Moreover, the labelled proteins/antibodies enable highly efficient in vivo tracking during blood circulation, without disturbing their biodistribution and tumor targeting ability, thus leading to a sensitive tumor-targeted imaging. CD-Au NCs are stable in the harsh biological environment and show good biocompatibility and high renal clearance efficiency. Therefore, the NIR-II biolabels developed in this study provide a promising platform to monitor the physiological behavior of biomolecules in living organisms.

关键词： NIR-II imaging cyclodextrin gold nanoclusters protein labelling tumor imaging

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Correction: Self-powered integrated system of a strain sensor and flexible all-solid-state supercapacitor by using a high performance ionic organohydrogel

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Materials Horizons 2020年第10期7卷 2768-2769页

作者： Jianren Huang Shuijiao Peng Jianfeng Gu Guoqi Chen Jianhong Gao Jin Zhang Linxi Hou Xiaoxiang Yang Xiancai Jiang Lunhui Guan College of Chemical Engineering Fuzhou University Fuzhou 350108 China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350108 China School of Mechanical Engineering and Automation Fuzhou University Fuzhou 350108 China

Correction for ‘Self-powered integrated system of a strain sensor and flexible all-solid-state supercapacitor by using a high performance ionic organohydrogel’ by Jianren Huang et al., Mater. Horiz., 2020, 7, 2085–...

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Quantized auger recombination of polaronic self-trapped excitons in bulk iron oxide

arXiv

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arXiv 2020年

作者： Liao, Hongyan Fan, Yunyan Lin, Yumei Wang, Kang Li, Renfu Chen, Xueyuan Zhang, Kelvin H.L. Yang, Ye State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou350002 China

The Auger recombination in bulk semiconductors can depopulate the charge carriers in a non-radiative way, which, fortunately, only has detrimental impact on optoelectronic device performance under the condition of high carrier density because the restriction arising from concurrent momentum and energy conservation limits the Auger rate. Here, we surprisingly found that the Auger recombination in bulk a-Fe2O3 films was more efficient than narrow-bandgap high-mobility semiconductors that were supposed to have much higher Auger rate constants than metal oxides. The Auger process in a-Fe2O3 was ascribed to the Coulombically coupled self-trapped excitons (STEs), which was enhanced by the relaxation of momentum conservation because of the strong spatial localization of these STEs. Furthermore, due to this localization effect the kinetic traces of the STE annihilation for different STE densities exhibited characteristics of quantized Auger recombination, and we demonstrated that these traces could be simultaneously modeled by taking into account the quantized Auger rates. Copyright © 2020, The Authors. All rights reserved.

关键词： Excitons

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Anchoring Cs+Ions on Carbon Vacancies for Selective CO2Electroreduction to CO at High Current Densities in Membrane Electrode assembly Electrolyzers

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Angewandte Chemie 2024年第40期136卷

作者： Yanhui Sun Prof. Junxiang Chen XueMei Du Jiwei Cui Xin Chen Chenhe Wu Xinmin Yang Lequan Liu Prof. Jinhua Ye Advanced Catalytic Materials Research Center School of Materials Science and Engineering Tianjin University Tianjin 300072 China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China International Center for Materials Nanoarchitectonics (WPI-MANA) National Institute for Materials Science (NIMS) Tsukuba 305-0047 Japan

Electrolyte cations have been demonstrated to effectively enhance the rate and selectivity of the electrochemical CO 2 reduction reaction (CO 2 RR), yet their implementation in electrolyte-free membrane electrode assembly (MEA) electrolyzer presents significant challenges. Herein, an anchored cation strategy that immobilizes Cs + on carbon vacancies was designed and innovatively implemented in MEA electrolyzer, enabling highly efficient CO 2 electroreduction over commercial silver catalyst. Our approach achieves a CO partial current density of approximately 500 mA cm −2 in the MEA electrolyzer, three-fold enhancement compared to pure Ag. In situ Raman and theoretical analyses, combined with machine learning potentials, reveal anchored Cs induces an electric field that significantly promotes the adsorption of *CO 2 − intermediates through performing muti-point energy calculations on each structure. Furthermore, reduced adsorption of *OH intermediates effectively hampers competing hydrogen evolution reaction, as clarified by disk electrode experiments and density functional theory studies. Additionally, coupling our system with commercial polysilicon solar cells yields a notable solar-to-CO energy conversion efficiency of 8.3 %. This study opens a new avenue for developing effective cation-promoting strategy in MEA reactors for efficient CO 2 RR.

关键词： anchored Cs CO2 electrolysis high current density CO electric field

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