通讯机构：
[Tang, YW ] C;Cent China Normal Univ, Inst Nanosci & Technol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
Metal organic framework;Core-shell;Ostwald ripening;Aqueous zinc -ion batteries
摘要：
The nanostructure designing strategy is one of the most effective methods to carry out the optimization of cathode materials for aqueous zinc ion batteries (ARZIBs). The design and synthesis of materials with stable nanostructure and short ion/electron transport paths are expected to alleviate the dilemma faced by vanadiumbased materials, such as poor electrical conductivity and structural changes. Ostwald ripening is a promising option in the design and fabrication of special nanostructures such as hollow and core shells. Selecting vanadiumbased metal-organic frameworks (V-MOF) as reactants, we successfully obtained vanadium oxide precursors with self-growing core-shell structures in one-step. As the reaction time increases, the vanadium oxide precursors undergo the process of microspheres -> core-shell -> yolk shell, which is thought to be the result of Ostwald ripening. After annealing, the vanadium oxide precursor becomes a "core-shell" structure vanadium pentoxide (core-shell V2O5). The ARZIBs assembled with core-shell V2O5 cathodes showed superior capacity (309.4 mAh/g at 0.1 A/g) and cycling stability (91.4 % capacity retention after 4000 cycles at 3A/g). Hence, we successfully realized the self-growth of vanadium oxide with core-shell structure in one step but also revealed the crystallization process based on Ostwald ripening and its zinc storage mechanism, which provides new possibilities for the facile synthesis of special nanostructured ARZIB cathode materials.
期刊：
Journal of Materials Chemistry C,2024年12(3):1002-1011 ISSN：2050-7526
通讯作者：
Tang, YW;Shi, Y
作者机构：
[Chen, Mingyue; Tang, Yiwen; Ran, Hongbing; Wu, Tong; Tang, YW] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Chen, Junfeng; Shi, Y; Shi, Yun; Zheng, Jiaqian; Li, Xiang] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201899, Peoples R China.;[Chen, Junfeng; Shi, Y; Shi, Yun] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China.;[Wu, Haodi] Huazhong Univ Sci & Technol, WNLO, Wuhan 430074, Peoples R China.;[Wu, Haodi] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China.
通讯机构：
[Shi, Y ; Tang, YW ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201899, Peoples R China.;Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China.
摘要：
Ternary copper halides, such as Cs3Cu2I5, as an emerging class of nontoxic alternatives to lead halide perovskites, have drawn extensive attention in the X-ray detection field due to their efficient self-trapped exciton emissions. However, the light yield far below the theoretical limit seriously hinders the high-resolution X-ray detection application of copper halide scintillators. Herein, Cs3Cu2I5:K+ scintillation films and single crystals with enhanced photoluminescence (PL) and radiation luminescence (RL) were first obtained by adjusting the doping concentration of K+ ions in the 0-8 at% range. The substitution of Cs+ by doping K+ compacted the adjacent [Cu2I5](3-) dimer groups, resulting in a stronger exciton-photon coupling strength. Therefore, Cs3Cu2I5:K+ single crystals exhibited a stronger RL emission under X-ray excitation, and their light output was about 49.6% higher than that of the pure Cs3Cu2I5, with an accelerated scintillation decay time (330 to 241 ns). Benefiting from these advantages, X-ray detectors based on hydrophobic polymethyl methacrylate (PMMA)-coated Cs3Cu2I5:K+ flexible films could deliver a higher X-ray imaging resolution of 11.7 lp mm(-1)@MTF = 0.2 in comparison with the commercial gadolinium oxysulfide (GOS)-based detectors (6.2 lp mm(-1)@MTF = 0.2). This work provides insights for the design of metal halides for use in low-cost and high-resolution flexible X-ray imaging systems.
通讯机构：
[Wang, SY ] S;[Tang, YW ] C;Shenzhen Polytech Univ, Coll Elect & Commun Engn, Shenzhen 518055, Peoples R China.;Cent China Normal Univ, Coll Phys & Technol, Dept Nanosci & Technol, Wuhan 430079, Peoples R China.
关键词：
Perovskite solar cells;Defect passivation;Surface induced secondary grain growth;Graded passivation
摘要：
Trap-mediated non-radiative loss is a major efficiency and stability obstale for solution-processed perovskite solar cells (PSCs). To address this issue, defect passivation using organic molecules has been identified as an effective strategy due to the ionic nature of the perovskite lattice. Herein, Ostwald ripening by using formamidine iodine (FAI) is reported to inhibit the carrier trap induced recombination via promoting secondary grain growth at perovskite surface. Based on secondary grain growth with FAI treatment, the graded passivation was presented caused by FA+ and I- from FAI. Moreover, the findings from time resolved photoluminescence and space charge-limited current technology indicate enhancements in the crystal quality. Consequently, this approach yielded a remarkable power conversion efficiency (PCE) of 20.62% for the FAI modified MAPbI3 photovoltaics, with significantly improved open-circuit voltage ratio of 3.10%, short-circuit density ratio of 6.11%, fill factor ratio of 9.46% and PCE ratio of 19.06%. Moreover, the device show the excellent stability. This study introduces simple and reproducible procedures for fabricating PSCs, which can be readily extended to diverse optoelectronic device applications.
通讯机构：
[Tang, YW ] C;Cent China Normal Univ, Inst Nanosci & Technol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
grain boundary passivation;hole-free carbon-based perovskite solar cells;interface modification;MAPbI(3);stability
摘要：
The interface modification of MAPbI3 films by dodecyltrimethylammonium chloride achieves passivation of both the film surface and grain boundaries. Ultimately, the power conversion efficiency and stability (thermal, optical, humidity, and antioxidant) of unencapsulated hole‐free carbon‐based perovskite solar cells are significantly enhanced. Currently, achieving both high efficiency and long‐term stability is crucial for the successful application of perovskite solar cells (PSCs). Grain boundary (GB) defects significantly impact the stability of PSCs, and passivating these GBs remains a major challenge. Herein, the surfactant dodecyltrimethylammonium chloride (DTAC) is dissolved in low‐polarity chlorobenzene (CB) at 58 °C to modify the interface of MAPbI3 film, and DTAC reacts with MAPbI3 film surface to generate a protective layer that can be covered on the perovskite grains, effectively reducing the expose GBs. Additionally, the hydrophobic alkyl chains of DTA+ and the strong chemical bond between the Cl− and Pb2+ ions further enhance the resistance of the perovskite surface layer to heat, moisture, and oxidation. Due to the passivation of iodine vacancy defects, the photo‐stability of unencapsulated DTAC devices is significantly improved. By passivating surface and GBs defects of the MAPbI3 perovskite crystals, the power conversion efficiency of the low‐temperature carbon‐based PSCs treated by DTAC is 15.03% compared to 13.97% for the control device. This study offers another referable strategy for enhancing the thermal, moisture, light, and oxygen stability of perovskite materials while considering the photovoltaic performance of devices.
通讯机构：
[Yiwen Tang] I;Institute of Nano-Science and Technology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
关键词：
Hierarchical structure;Multi dimension;Ni-based hydroxides and sulfides composite;Supercapacitor;Synergistic effect;Three phase
通讯机构：
[Tang, YW ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Inst Nanosci & Technol, Wuhan 430079, Peoples R China.
关键词：
Printable perovskite solar cells;CsPbBr 3;Two-step method;Two-in-one additive engineering strategy
摘要：
The use of all-inorganic cesium lead tribromide (CsPbBr3) in photovoltaics has gained significant attention due to its outstanding environmental stability and low cost of preparation. Printable perovskite solar cells (PSCs) based on CsPbBr3 have demonstrated a more straightforward fabrication procedure and remarkable stability, indicating great development potential. However, the preparation of the CsPbBr3 film can be challenging, as it requires depositing a high-quality PbBr2 film in a triple-layer porous scaffold and avoiding the incomplete conversion of PbBr2 in the subsequent step. Herein, we propose a two-in-one additive engineering strategy using 4-tert-Butylpyridine (TBP) into the PbBr2 solution and dimethyl sulfoxide (DMSO) to the CsBr precursor. The improved perovskite layer with better infiltration in scaffold, low carrier recombination rate and high absorption ability results in the boosting performance of PSCs. When the TBP is coupled with DMSO to fabricate printable mesoscopic CsPbBr3 PSCs, the device achieves a power conversion efficiency as high as 8.36 %. Furthemore, the modified CsPbBr3 PSC without any encapsulation retains above 97 % of its initial efficiency after 1600 h of storage in ambient air, indicating outstanding stability.
通讯机构：
[Yiwen Tang] I;Institute of Nano-Science and Technology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
摘要：
Polyoxometalates (POM) have a wide range of applications in electrochemistry, catalysis, and energy storage due to their variable structure and nature. Here, we designed a novel 3D porous network of ultrathin V6O13- POM nanosheets on carbon cloth (V6O13-POM//CC) for the first time by one-pot hydrothermal method with the help of phosphotungstic acid. Serving as inorganic ligands, the anions of phosphotungstic acid co-ordinate with V cations, facilitating the assembly of nanoclusters and guiding to control of the morphology of V6O13-POM composites, which increases the specific surface area and multiple active sites for the re-action of lithium ions batteries (LIBs). Furthermore, the synergistic effect of V6O13 and POM improves the stability of the structure and increases the capacity of the electrode in LIBs. V6O13-POM//CC as an anode material exhibited a high reversible capacity of 2.03 mAh cm-2 at a high current density of 2 mA cm-2 after 120 cycles. To illustrate the generality of the synthesis strategy, we also obtained MoO3-POM//CC via a similar method. By using V6O13-POM//CC and MoO3-POM//CC as the anode materials, LIBs exhibited high reversible areal specific capacity and excellent cycling stability which are expected to achieve commercial applications.(c) 2022 Elsevier B.V. All rights reserved.
作者机构：
[Du, Xuena; Guo, Long; Wang, Hai; Jin, Sanmei; Cui, Xiaoxiao; Zhong, Hongxia] China Univ Geosci, Sch Math & Phys, Wuhan 430079, Peoples R China.;[Tang, Yiwen] Cent China Normal Univ, Inst Nanosci & Technol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Dang, Dai] Guangdong Univ Technol, Sch Chem Engn & Light Ind, Guangzhou 510006, Peoples R China.
通讯机构：
[Hai Wang] S;[Yiwen Tang] I;School of Mathematics and Physics, China University of Geosciences, Wuhan 430079, P. R. China<&wdkj&>Institute of Nano-Science and Technology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, P. R. China
期刊：
Journal of Materials Chemistry C,2023年11(34):11529-11541 ISSN：2050-7526
通讯作者：
Tang, YW
作者机构：
[Zhao, Yue; Tang, Yiwen; Ran, Hongbing; Chen, Xiangjie; Wang, Yulin; Ouyang, Tao] Cent China Normal Univ, Inst Nanosci & Technol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Wang, Shiyu] Shenzhen Polytech, Coll Elect & Commun Engn, Shenzhen 518055, Peoples R China.;[Tang, YW] Cent China Normal Univ, Inst Nanosci & Technol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Tang, YW ] ;Cent China Normal Univ, Inst Nanosci & Technol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
Uncontrolled Ostwald maturation is often accompanied by residual lead iodide (PbI2), which can degrade into elemental lead and severely damage the perovskite device upon exposure to light and radiation, ultimately accelerating device decay. However, PbI2 also serves as a critical raw material for the formation of a two-dimensional perovskite. Herein, we designed an innovative synergistic passivation strategy that effectively utilized residual PbI2 generated during Ostwald ripening as a raw material for dimensional engineering, achieving deep passivation for defects and improving the performance of the perovskite device. First, we induced the Ostwald curing process through post-processing the MAI-PbI2-DMSO mesophase with GUTS (guanidine thiocyanate), achieving maximum grain growth and fewer defects in the thin film. Unfortunately, this also resulted in residual PbI2 with adverse effects. To eliminate this effect, we further processed the film with BAI (butylamine iodide) in the second step, which not only eliminated residual PbI2, but also contributed to the formation of the 2D perovskite, optimizing energy level alignment and improving humidity stability. Finally, the successive passivation of defect states resulted in over 10% improvement in photoelectric conversion efficiency for the carbon-based PSCs prepared using the synergistic strategy. This work highlights the effectiveness of a synergistic passivation strategy for improving device performance.
摘要：
Aqueous rechargeable zinc-ion batteries (ARZIBs) are promising candidates for fast-charging energy-storage systems. The issues of stronger interactions between Zn(2+) and the cathode for ultrafast ARZIBs can be partially addressed by enhancing mass transfer and ion diffusion of the cathode. Herein, via thermal oxidation for the first time, N-doped VO(2) porous nanoflowers with short ion diffusion paths and improved electrical conductivity were synthesized as ARZIBs cathode materials. The introduction of nitrogen derived from the vanadium-based-zeolite imidazolyl framework (V-ZIF) contributes to enhanced electrical conductivity and faster ion diffusion, while the thermal oxidation of the VS(2) precursor assists the final product in exhibiting a more stable three-dimensional nanoflower structure. In particular, the N-doped VO(2) cathode shows excellent cycle stability and superior rate capability with the delivered capacities of 165.02 mAh g(-1) and 85 mAh g(-1), at 10 A g(-1) and 30 A g(-1), and the capacity retention of 91.4% after 2200 cycles and 99% after 9000 cycles, respectively. Remarkably, the battery takes less than 10s to be fully charged at 30 A g(-1). Hence, this work provides a new avenue for designing unique nanostructured vanadium oxides and developing electrode materials suitable for ultrafast charging.
摘要：
Aqueous zinc-ion batteries have emerged as viable energy storage solutions owing to their economical pricing, enhanced safety features, environmentally sustainable nature, and remarkable theoretical storage capacity. Metal vanadate has been deeply researched as one of the cathode materials with great promise. However, most of the previous reports of metal vanadates require high energy consumption or a complex synthesis process to ensure high electrochemical performance. Herein, Li-K coinsertion vanadate nanoflake (Li-KVO) was synthesized by a facile method at a low-temperature water bath. When assembled as the cathode, Li-KVO exhibits an excellent Zn2+ storage ability (363 mAh g(-1) at 0.1 A g(-1)), impressive rate performance (212 mAh g(-1) at 5 A g(-1) and 128 mAh g(-1) at 20 A g(-1)), and long cycling stability (81.1% capacity retention under 20 A g(-1) for 10,000 cycles). The in-depth research indicates that the high electrochemical performance originates from the Li+-induced kinetically favorable rich oxygen vacancies and nanoflake structure. Furthermore, ex situ XPS and ex situ XRD prove that the "pillar" effect of Li+ ensures the stability of the V-O layer structure. This strategy broadens the path for the synthesis of layered vanadium oxides and promotes their application as cathode materials for zinc-ion batteries.
通讯机构：
[Yiwen Tang] I;Institute of Nano-Science & Technology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
摘要：
The Ni-Fe composite catalyst has received in-depth research attention due to high intrinsic activity in electrochemical water splitting applications. Corrosion engineering is considered an effective strategy for preparing large-scale Ni-Fe composites to match industrial electrocatalytic electrolyzers. Here, we demonstrate an efficient corrosion strategy to prepare defect-rich Ni(Fe)OOH/Ni(Fe)S-x nanosheet arrays on a NiFe foam within 10 min. The corrosion solution we proposed (containing (NH4)(2)S2O8, (NH2)(2)CS, and FeCl3) has strong oxidizing properties, which releases a large amount of heat when it corrodes the Ni-Fe foam. The heat promotes the hydrolysis of (NH2)(2)CS and creates an alkaline environment for the rapid growth of Ni-Fe composites. Experimental results reveal that Ni(Fe)S-x plays a crucial role in enhancing the oxygen evolution reaction performance of Ni(Fe)OOH/Ni(Fe)S-x. Therefore, Ni(Fe)OOH/Ni(Fe)S-x exhibits remarkable catalytic activity with low overpotentials of 227 and 313 mV to afford current densities of 10 and 1000 mA cm(-2), respectively. Under 270 mV overpotential, the intrinsic catalytic activity of Ni(Fe)OOH/Ni(Fe)S-x is 24.65-fold, 21.09-fold, and 52.21-fold that of FeOOH/FeSx, NiOOH/NiSx, and Ni(Fe)OOH, respectively. Moreover, large-scale Ni(Fe)OOH/Ni(Fe)S-x electrode materials are prepared with a size of 10 x 10 cm(2) on a NiFe foam, implying the huge potential for practical applications. This work offers a new perspective on designing large-scale and highly active oxygen evolution catalysts.
通讯机构：
[Yue Hu; Yue Hu Yue Hu Yue Hu] W;Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074 China
关键词：
controllable morphology;CsPbBr3;perovskite solar cells;solvent strategy
摘要：
Herein, a solvent strategy by using N‐methylformamide as the precursor solvent of PbBr2 is used for improving the perovskite crystallization in the printable mesoscopic structure. The efficiency of perovskite solar cells (PSCs) increases from 7.53% to 8.32%. In addition, PSCs show no obvious attenuation after 1000 h of maximum power point tracking, displaying excellent illumination stability. The CsPbBr3 perovskite solar cells (PSCs) display extensive potential due to their good thermal and humidity stability, but the presence of heterogeneous phases severely limits the further improvement of device performance. Phase‐pure monoclinic CsPbBr3 can be stabilized by using the printable mesoscopic device structure. However, it is challenging to obtain high‐quality perovskite crystals in such confined space. Herein, a solvent strategy is used for improving the perovskite crystallization in the printable mesoscopic structure. By using N‐methylformamide as the precursor solvent, the PbBr2 exhibits a more uniform and controllable distribution, which benefits the CsPbBr3 crystallization. As a result, the CsPbBr3 inside the pores showed obvious orientation at (100) lattice plane and (110) crystal plane. The efficiency of modified PSCs increases from 7.53% to 8.32%. Based on the device with effective area of 1 cm2, the PSCs obtain a power conversion efficiency of 5.62%. In addition, PSCs show no obvious attenuation after 1000 h of maximum power point tracking, displaying the excellent illumination stability.
摘要：
Transition metal oxides as the electrode material of supercapacitors have been widely studied due to their high energy density. However, relatively low power density resulting from poor conductivity of the metal oxides limits their application. In this paper, a new N-doped NiCoO2 nanosheet array on Ni foam was synthesized through an ammonia-induced reduction strategy. During the ventilation of NH3 in the ammonia annealing stage, N was doped into the structure of NiCoO2, which leads to increased concentration of oxygen vacancies and improved conductivity. As a positive electrode, N-doped NiCoO2 exhibits excellent rate performance (1449.3 F g(-1) at 1 A g(-1) and 1190.4 F g(-1) at 50 A g(-1)) and impressive cycle stability (the capacitance retention ratio is 92% after 5000 cycles at the current density of 40 A g(-1)) compared to undoped NiCoO2 nanosheet array electrode. Assembling it as the positive electrode and activated carbon as the negative electrode, the aqueous asymmetric supercapacitor exhibits high power density, energy density, and excellent rate performance. The remarkable energy storage performances make N-doped NiCoO2 nanosheet arrays material (N-NiCoO2) have a broad application prospect in the field of supercapacitors. (C) 2021 Elsevier B.V. All rights reserved.
通讯机构：
[Yue Hu] M;[Yiwen Tang] D;Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074 China<&wdkj&>Department Nano-Science & Technology, College of Physics and Technology, Central China Normal University, Wuhan, 430079 China
关键词：
crystallization quality;CsPbBr3;energy band alignment;europium ions;perovskite solar cells
摘要：
The high‐valence Eu3+ was applied in carbon‐based printable mesoscopic inorganic CsPbBr3 perovskite solar cells (PSCs) for the first time. The high open‐circuit voltage and stability of the device demonstrate that the CsPbBr3 PSC is a promising device to drive the water electrolysis device. The all‐inorganic CsPbBr3 perovskite exhibits the possibility of overcoming the substantial nonideal thermal, humidity, and photostability of hybrid organic–inorganic perovskite solar cells (PSCs) in photoelectronic devices. Specifically, the rapid development of CsPbBr3 perovskite has delivered device efficiencies >10%. However, the mismatched energy band alignment and bad crystallization quality are still potential obstacles for the superior performance of PSCs. Herein, by employing n‐type doping, trivalent europium cation is successfully introduced into the CsPbBr3 lattice. The better energy‐level alignment leads to further reduction of voltage losses. Besides, the large and uniform grains resulting from the improvement of crystallization after doping decrease the grain boundaries and reduce the nonradiative recombination center. The quality of the film improves substantially, which significantly enhances the photoabsorption and the short‐circuit current density. The efficiency of the carbon‐based printable mesoscopic PSCs is improved from 7.5% to 8.06% with 3 mol% Eu3+ doping, resulting in high open‐circuit voltage of 1.41 V. Based on the device with effective area of 1 cm2 and 60.075 cm2, the record power conversion efficiency of 5.41% and 1.14% is obtained. The device also displays excellent stability with driving water electrolysis.
摘要：
Development of high conductivity and amorphous structure is at great significance in electrochemical storage applications. Two-dimensional nanosheet array has a large surface area and abundant active sites, showing great potential in the field of energy storage. Among many materials, Co-based oxides or hydroxides have high theoretical specific capacity and are widely used as electrode materials for hybrid supercapacitors, but low electrical conductivity inhibits their development. Here, Co(OH)2 nanosheet arrays are randomly transformed into CoTe, metallic Co, and CoO composite (CoTe/Co/CoO) during the hydrothermal process. The CoTe/Co/CoO nanosheets have abundant grain boundaries due to the multi-component effect. Thanks to the high elasticity of amorphous CoO, and the high conductivity of CoTe and Co, CoTe/Co/CoO composite nanosheet arrays exhibit excellent electrochemical performance, such as high capacity (501 C g(-1) at 5 mA cm(-2)) and excellent cycle stability (95.2% capacity retention after 4000 cycles). Moreover, asymmetric supercapacitors are assembled with CoTe/Co/CoO as positive electrode and activated carbon as negative electrode, the developed device delivers a maximum energy density of 35.29 Wh Kg(-1) with superb cycling stability.
