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Direct Z-Scheme Heterostructure of In Situ Planted ZnO Nanorods on g-C3N4 Thin Sheets Sprayed on TiO2 Layer: A Strategy for Ternary-Photoanode Engineering toward Enhanced Photoelectrochemical Water Splitting

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ACS Applied Energy Materials 2024年第3期7卷 906-918页

作者： Aboubakr, Ahmed Esmail A. Hussien, Mahmoud Kamal Sabbah, Amr Hassan, Ahmed E. Elsayed, Mohamed Hammad Wen, Zhenhai Chen, Kuei-Hsien Hung, Chen-Hsiung Sustainable Chemical Science and Technology Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan Department of Applied Chemistry National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Institute of Chemistry Academia Sinica 128 Sec 2 Academia Rd. Taipei11529 Taiwan Department of Chemistry Faculty of Science Assiut University Assiut71516 Egypt Center for Condensed Matter Sciences National Taiwan University Taipei10617 Taiwan Tabbin Institute for Metallurgical Studies Tabbin Helwan 109 Cairo11421 Egypt 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 Fujian Fuzhou350002 China University of Chinese Academy of Sciences Beijing100049 China Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Department of Chemistry Faculty of Science Al-Azhar University Cairo11884 Egypt

In this study, we developed an approach to enhance the separation and transfer of charge carriers for photoelectrochemical water splitting in solar-driven hydrogen production. We achieved this by designing a highly efficient Z-scheme TiO2/g-C3N4/ZnO photoanode. The process involved electrodepositing a thin TiO2 layer on FTO and optimizing the in situ ZnO implantation onto g-C3N4. These composites were confirmed by XRD, SEM, EDX, and TEM measurements. The growth of ZnO on g-C3N4 resulted in strong chemical adhesion between the interface of ZnO and g-C3N4, as supported by XPS data, and increased active surface area, as demonstrated by BET. The composition of ZnO and g-C3N4 facilitated rapid charge separation and retarded change recombination through directional charge migration and decreased charge resistance, as evidenced by PEIS and TRPL measurements. Our airbrushing procedure for fabricating the g-C3N4/ZnO composite on TiO2 also enhanced the charge collection efficiency, enabling us to construct a high-performance photoanode. The Z-scheme-type charge migration route was verified by EPR spectroscopy by trapping the radicals generated by charges and holes. PEC-WS measurements showed that TiO2/g-C3N4/ZnO heterostructure improved the produced photocurrent by about 160-, 40-, 20-, 8-, 2-, and 2-fold, relative to pristine g-C3N4, pristine ZnO nanorods, ZnO/g-C3N4 composite, pristine TiO2, TiO2/ZnO, and TiO2/g-C3N4, respectively, versus reversible hydrogen electrode (RHE) at 1.23 V. The charge carriers’ separation and injection measurements showed that the fabrication of this ternary photoanode remarkably improved the PEC-WS performance. DFT results contributed to a deeper understanding of the mechanism of the photocatalytic process and confirmed that the as-fabricated ternary heterojunction promoted the separation/transfer efficiency of the photogenerated charge carriers, thereby promoting the activity of the photocatalytic process. This work could pave the way for bette

关键词： Zinc oxide

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Multiple Strategies from Apparatus to Synthetic Process Toward High-Performance Spherical Manganese Hexacyanoferrate for Sodium-Ion Batteries

SSRN

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SSRN 2024年

作者： Zheng, Jun Wang, Gang Zhang, Kai Zheng, Jiafan Fu, Wenwu Zhang, Chengyu Liu, Jiayi Wang, Jieyuan Li, Junwei Cai, Fu Huang, Wenbo Zhang, Ming Shen, Zhongrong 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 Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth Materials Haixi Institutes Chinese Academy of Sciences Xiamen361021 China College of Chemistry and Materials Science Fujian Normal University Fuzhou350007 China University of Chinese Academy of Sciences Beijing101408 China Xiamen 3-circles Battery Co. Ltd Xiamen361023 China

Traditional cube Prussian blue analogs with limited processability and low density are not suitable for the fabrication of high energy density sodium-ion batteries. Here, we present a novel reactor called the dual-vortexed coprecipitation chamber (DVCC) and a corresponding click reaction mechanism for producing high-density, size-controllable, spherical and low-deficiency manganese-based Prussian blue analogs. Through the optimized controlled crystallization precipitation technique, we are able to precisely regulate the nucleation, crystallization and spherical agglomeration process. In comparison to cubic crystals, our unique spherical particles exhibited superior performance with a controllable size distribution of 0 ~ 40 μm, compacted density of 1.60 g cm-3, an initial capacity of 132.5 mAh g-1 and notably retention rates of 99.5% for coin cell and 86.7% for pouch cell respectively after 500 cycles at 1 C rate. Benefit by the low H2O content (less than 300 ppm) in the electrodes, the pouch cell avoided gas expansion and also demonstrated excellent fast discharge capability with a retention of 78.7% at a maximum rate of 40C compared to 1C rate. © 2024, The Authors. All rights reserved.

关键词： Metal ions

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Self-Healing Perovskite Solar Cells Based on Copolymer-Templated Tio2 with Copper Indium Disulfide as the Hole Transport Layer

SSRN

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SSRN 2022年

作者： Lalpour, Nakisa Mirkhani, Valiollah Keshavarzi, Reza Moghadam, Majid Tangestaninejad, Shahram Mohammadpoor-Baltork, Iraj Gao, Peng Department of Chemistry Catalysis Division University of Isfahan Isfahan81746-73441 Iran CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on The Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China

Inorganic hole-transport materials (HTMs) such as copper indium disulfide (CIS) have been applied in perovskite solar cells (PSCs) to improve the poor stability of the conventional Spiro-based PSCs. However, the main drawback of CIS-PSCs is their lower efficiency compared with Spiro-PSCs. In this work, copolymer-templated TiO2 (CT-TiO2) structures have been used as an electron transfer layer (ETL) to improve the photocurrent density and efficiency of CIS-PSCs. Compared to the conventional random porous TiO2 ETLs, copolymer-templated TiO2 ETLs with a lower refractive index improve the transmittance of input light into the cell and therefore enhance the photovoltaic performance. Interestingly, a large number of surface hydroxyl groups on the CT-TiO2 induce a self-healing effect in perovskite. Thus, they provide superior stability in CIS-PSC. The fabricated CIS-PSC presents a conversion efficiency of 11.27% and a high photocurrent density of around 23 mA/cm2. Moreover, these unsealed CIS-PSCs retained 100% of their performance after aging tests for 90 days under ambient conditions and even increased from 11.08 to 11.27 over time due to self-healing properties. © 2022, The Authors. All rights reserved.

关键词： Sulfur compounds

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Synthesis, Structure and Electrocatalytic Activity of Perfluorinated Covalent Triazine-based Framework

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Chinese Journal of Structural Chemistry 2019年第2期38卷 233-241,166页

作者： WANG Yuan-Shuang WEN Zhen-Hai CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

Using the bottom-up method, we synthesized a series of perfluorinated covalent triazine-based frameworks(FCTFs) with porous structures for catalysis oxygen reduction reaction(ORR). The evolved FCTFs by high-temperature carbonization show an apparent variation in electrocatalytic activity toward the ORR dependent on the type of F. The samples synthesized at 900 ℃(FCTF-900) exhibits advantages in terms of high activity, high durability, and methanol-tolerant as an efficient electrocatalyst for ORR, manifests a comparable or even better activity as compared with the commercial Pt/C catalysts not only in alkaline media but also in acidic and neutral electrolyte.

关键词： electrochemical reduction porous polymers covalent triazine-based framework ionothermal polymerization

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Synthesis, Structure, and Magnetism of a Rhombic Metallocycle

SSRN

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SSRN 2023年

作者： Wu, Zhi-Yan Chen, Ting Huang, Min Nan, Zi-Ang Liao, Jin-Sheng Zhuo, Zhu Huang, You-Gui School of Material and Chemistry Engineering Jiangxi University of Science and Technology Jiangxi Ganzhou341000 China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research The Structure of Matter Chinese Academy of Sciences China Xiamen Institute of Rare Earth Materials Haixi Institutes Chinese Academy of Sciences Xiamen361021 China

A rhombic metallocycle [CoII6Cl6(L‒H+)2(L‒2H+)2]·6DMF·6H2O (1) (L = tris(2-naphthimidazolylmethyl) amine) composed of two CoIICl(L‒H+) moieties and two CoIICl(L‒2H+) moieties alternately bridged by two μ3-CoII ions has been synthesized under solvothermal condition. Each metallocycle associate with its six neighbors through intermolecular π···π interactions between naphthimidazolylmethyl arms forming a supramolecular framework with a distorted pcu network. Magnetic measurements on the metallocycle reveal dominant antiferromagnetic couplings between CoII centers. © 2023, The Authors. All rights reserved.

关键词： Supramolecular chemistry

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Influence of Poly(Ethyleneimine) functionalized Carbon Nanotubes on Mechanical and Tribological Behavior of Epoxy Resins

SSRN

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SSRN 2022年

作者： Liu, Ming Hou, Dongyang Wu, Lixin School of Mechanical Engineering and Automation Fuzhou University Qishan Campus Fujian Fuzhou350116 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 Fujian Fuzhou350002 China

Epoxy-based nanocomposites were prepared with the addition of poly(ethyleneimine) (PEI, an amine-riched polymer) functionalized multi-walled carbon nanotubes (MWCNTs), whose microstructure was characterized by TEM and FTIR spectra. Effects of PEI-functionalized MWCNTs (PEI-MWCNTs) on micromechanical properties of nanocomposites were characterized by instrumented indentation with Berkovich indenter and microscratch test with Rockwell C indenter. With the increase in the content of PEI-MWCNTs: both nanoindentation hardness and elastic modulus of nanocomposites increase;scratch normal hardness and elastic recovery rate decrease in an approximately linear way;fracture toughness obtained by scratch-based linear elastic fracture mechanics increase in an approximately linear way. © 2022, The Authors. All rights reserved.

关键词： Wear of materials

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Enhanced CO2 Electrolysis with Mn-doped SrFeO3-δ Cathode

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Chinese Journal of Structural Chemistry 2020年第9期39卷 1662-1668,1556页

作者： HOU Shi-Sheng XU Ze-Tong ZHANG You-Kai XIE Kui GAN Li-Zhen College of Transportation and Civil Engineering Fujian Agriculture and Forestry UniversityFuzhou 350002China Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Solid oxide carbon dioxide electrolysers are expected to play a key role in carbon-neutral energy ***,the limited activity of traditional ceramic cathodes still restricts the electrochemical *** we report the doping of Mn at the B site of SrFeO3-δcathode to improve CO2 *** oxygen vacancy concentration is increased by^30%with Mn doping while the surface oxygen exchange coefficients are enhanced by^10 *** chemisorption of CO2 indicates the presence of chemical intermediate state between CO2 molecule and carbonate ion on the oxygen-deficient cathode surface which therefore leads to the desorption temperature of^800℃.The Mn-doped SrFeO3-δenhances CO2 electrolysis with no performance degradation being observed even after high-temperature operation of 100 hours.

关键词： oxygen vacancy cathode carbon dioxide solid oxide electrolyser

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Porous Iron Single Crystals at 2 cm Scale Delivering Enhanced Electrocatalysis Performance

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Chinese Journal of Structural Chemistry 2020年第11期39卷 2033-2040页

作者： CHENG Fang-Yuan MYUNG Jae-Ha XIE Kui College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Key Laboratory of Design&Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Porous single crystals would significantly enhance their catalysis functionalities owing to the combination of structural coherence and porous microstructures. Porous single crystals have wormhole microstructures and then we define them as wormcrystals. The twisted surfaces in porous microstructures would produce surface lattice distortions that give rise to high-energy active surfaces. Here we grow porous iron single crystals at an unprecedented 2 cm scale with a lattice reconstruction strategy and create high-energy surfaces through the control of lattice distortions within a thickness region of 1~2 nm. The porous iron crystal therefore boosts electrochemical reduction of nitrobenzene to aminobenzene with ~100% conversion and > 95% selectivity. The exceptionally high current densities with porous iron crystals represent the first level electrocatalysis performance. The current work would open a new pathway not only to the creation of high energy surfaces but also to the growth of porous single crystals at large scales in wealth of other materials.

关键词： porous single crystals twisted surfaces lattice distortions electrocatalysis

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Enhanced Oxidative Coupling of Methane with Oxygen Permeation Membrane

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Chinese Journal of Structural Chemistry 2020年第12期39卷 2115-2122,2054页

作者： YUAN Sheng-Ze XIE Kui College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Key Laboratory of Design&Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Oxidative coupling of methane to ethylene is of high importance to the future of light olefin ***,the carbon atom efficiency is normally below 50%in gas phase reaction which is limited to the overoxidation of methane to carbon dioxide with *** we present an alternative approach of electrochemical oxidation of methane in an oxygen permeation membrane reactor and show the highest conversion of methane and C2 selectivity of 28%and 40.2%at 1150℃,*** prepare the 100-μm-thick perovskite(La0.8 Sr0.2)1-x Cr0.5 Fe0.5 O3-δ(LSCrF)dense membrane(La0.8 Sr0.2)1-xCr0.5 Fe0.5O3-δ(LSCrF–Fe)(x=0,0.02,0.05 and 0.10)scaffolds while the excess of Fe would be exsolved on porous skeleton to create metal-oxide interfaces toward methane *** metal-oxide interfaces not only facilitate the activation of C–H bond in methane but also enhance the coking resistance.

关键词： oxidative coupling of methane oxygen permeation membrane nanoparticles metal-oxide interfaces

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Hybrid of Quaternary Layered Double Hydroxides and Carbon Nanotubes for Oxygen Evolution Reaction

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Chinese Journal of Structural Chemistry 2020年第10期39卷 1807-1816,1742页

作者： FU Chang-Le WANG Yi HUANG Jun-Heng Fujian Normal University Fuzhou 350007China CAS Key Laboratory of Design and Assembly of Functional Nano-structures Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Highly active electrocatalysts based on Layered Double Hydroxides(LDH)towards oxygen evolution reactions(OER)are required for the applications of renewable energy-conversion *** improvement of conductivity and electron-transporting capability for LDH materials remains an enormous challenge ***,we synthesized carbon nanotube supported quaternary FeCoNiW-LDH ultrathin nanosheets with 1 nm thickness via one-pot hydrothermal methods,which exhibit enhanced OER activity due to the synergistic effect of modified CNTs and doped W^6+onto LDH nanosheets *** loaded carbon nanotubes can directly result in the improved *** addition,W^6+doping in LDH can modify the electronic structure and further enhance the conductivity of ***-LDH/CNT exhibits a small overpotential(258 mV)at a current density of 10 mA·cm^–2 and low Tafel slope(41 mV decade^–1)towards OER in alkaline solutions,outperforming the noble metal RuO2 catalysts.

关键词： FeCoNiW layered double hydroxide electrocatalyst reduced carbon nanotube tungsten doping oxygen evolution reaction

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