Nanomaterials
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2022
·Vol. 12
·期 16
·2876
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IF 5.719
Dongwei Xu,Huanhuan Guo,Feifan Zhang,Yanmei Wu,Xiaoqin Guo,Yumei Ren,Desheng Feng
Hollow nanoboxes structure have raised great attention as microwave absorption materials on account of their ultralow density and large specific area. By introducing an adjustable interior cavity structure, the dielectric loss and microwave absorption performance were affected by the tunable complex permittivity and impedance matching was improved. In our study, hollow CoS2nanoboxes with designable interspaces were successfully fabricated based on the surfactant-assisted solution method and followed by an in situ ion-exchange process. The structure, elemental compositions and morphology of the products were characterized by XRD, XPS, EDX, SEM and TEM, respectively. In addition, microwave absorption performance and the intrinsic mechanism are investigated in-depth. The paraffin-based composites with 20 wt.% filling contents exhibited superior microwave absorption capacities in view of both maximum reflection loss value (RLmax, −54.48 dB) and effective absorption bandwidth (EAB, below −10 dB, 6.0 GHz), which can be ascribed to unique hollow structure and good impedance matching. With these considerations in mind, this study provides a reference for the construction of high-performance microwave absorbers with unique hollow structure.Keywords:CoS2;hollow nanoboxes;ion-exchange;microwave absorption
研究领域:
材料科学
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电磁学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Xiaofang Liu,Manman Yuan,Wenhua Shi,Anmin Fei,Yawen Tian,Zhi-Yi Hu,Lihua Chen,Yu Li,Bao-Lian Su
Silicon (Si) is considered as the most likely choice for the high-capacity lithium-ion batteries owing to its ultrahigh theoretical capacity (4200 mA h g–1) being over 10 times than that of traditional graphite anode materials (372 mA h g–1). However, its widespread application is limited by problems such as a large volume expansion and low electrical conductivity. Herein, we design a hollow nitrogen-doped carbon-coated silicon (Si@Co-HNC) composite in a water-based system via a synergistic protecting-etching strategy of tannic acid. The prepared Si@Co-HNC composite can effectively mitigate the volume change of silicon and improve the electrical conductivity. Moreover, the abundant voids inside the carbon layer and the porous carbon layer accelerate the transport of electrons and lithium ions, resulting in excellent electrochemical performance. The reversible discharge capacity of 1205 mA h g–1 can be retained after 120 cycles at a current density of 0.5 A g–1. In particular, the discharge capacity can be maintained at 1066 mA h g–1 after 300 cycles at a high current density of 1 A g–1. This study provides a new strategy for the design of Si-based anode materials with excellent electrical conductivity and structural stability.
研究领域:
材料科学
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能源存储
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Yu Zhang,Yaolong Zhang,Ruxangul Jamal,Shuyue Xie,Abdukeyum Abdurexit,Tursun Abdiryim,Hongtao Yang,Kai Song
To improve the efficiency of the methanol oxidation reaction (MOR) in direct methanol fuel cells (DMFCs), it is essential to develop catalysts with high catalytic activity. However, constructing polyatomic doped carbon nanomaterials and understanding the interaction mechanisms between dopant elements remain significant challenges. In this study, we propose nitrogen-doped carbon nanobox (CNB) derived from Zeolitic Imidazolate Framework-67 (ZIF-67) crystals as precursors to serve as carriers for highly efficient platinum nanoparticles (Pt NPs). We synthesized platinum/poly(3,4-propylenedioxythiophene)/carbon nanobox (Pt/PProDOT/CNB) composites by wrapping CNB around PProDOT films via in situ oxidative polymerization. This unique structural design provides several advantages to the catalyst, including a large active surface area, numerous accessible electrocatalytic active centers, an optimized electronic structure, and good electronic conductivity. The Pt/PProDOT/CNB composites demonstrated excellent methanol oxidation performance, with a remarkable mass activity (MA) of 1639.9 mA mg -1 Pt and a high electrochemical active surface area (ECSA) of 160.8 m 2 /g. Furthermore, the catalyst exhibited good CO resistance and outstanding durability.
研究领域:
材料科学
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催化化学
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能源科学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Hua Li,Shuiqiang Chen,Fang Su,Zheng Li,Ke-Wen Tang
Optimizing the composition and structure of nanocatalysts is an efficient approach to achieving the top electrocatalytic performance. However, the construction of hollow nanocomposites composed of metal phosphides and highly conductive carbon to promote the electrocatalytic performance of metal phosphide-based catalysts is rarely reported. Herein, a CoFeP/C nanobox nanocomposite consisting of Co–Fe mixed-metal phosphides and N-doped carbon was successfully fabricated through an ion-exchange phosphidation strategy derived from ZIF-67 nanocubes. Benefiting from the synergistic effects between multiple components and the unique hollow structure, CoFeP/C nanoboxes can catalyze the alkaline oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) with high activity and stability. Furthermore, in the construction of an alkaline water electrolyzer using CoFeP/C nanoboxes as both OER and HER catalysts, they were capable of efficiently splitting water with a current density of 10 mA cm–2 achieved by applying only 1.62 V of cell voltage and exhibited outstanding durability. Density functional theory calculations demonstrate that synergistic effects among multiple components in CoFeP/C nanoboxes can lower the hydrogen adsorption free energy of the HER and OER energy barrier of the rate-determining step, thus promoting the catalytic reactions. The design and synthesis of CoFeP/C nanoboxes highlight the importance of the composition and structural characteristics in achieving high-performance water electrolysis.
研究领域:
材料科学
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电化学
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催化科学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Minxuan Huang,Shaopeng Wang,Hao Fu,Hongyun Shao,Yinghui Wang,Kefu Yu,Yilin Huang,Zhiping Jv,Liwei Wang
For widely used semiconductor-based chemoresistive sensors, low sensitivity and poor anti-interference in the complex environment (humidity resistance, etc. ) are two main constraints of application. To enhance the sensitivity, many effective strategies have been developed such as constructing heterostructures with synergistic effects, introducing abundant oxygen vacancies as active sites, designing hollow/cavity structure to increase surface area to facilitate target gas adsorption, and so on. Besides, the interference caused by water vapor can be blocked. via MOF or molecular sieve membranes but is accompanied with the shielding of some target molecules. The above methods are faced with the problems of complex process, large workload of material screening and failure to maintain the device stability. Hence, an effective vapor-phase method derived N-C@SnO 2 -Co 3 O 4 complex that combined the hydrophobicity , acetone selectivity, p-n heterostructure with mesoporous hollow characteristics was proposed, named mesoporous N-C@SnO 2 -Co 3 O 4 hollow nanoboxes (HNBs). Particularly, the chemoresistive sensor based on N-C@SnO 2 -Co 3 O 4 HNBs (2.0%) showed satisfactory selectivity to acetone vapor at relatively low working temperature (160 °C), and the response remained stable even under high humidity (with the R.H. of 90%). Impressively, a three-fold enhancement in response signal was observed for the sensor based on N-C@SnO 2 -Co 3 O 4 HNBs when compared with its counterpart of SnO 2 -Co 3 O 4 , which can be ascribed to the consequent unpaired electrons from oxygen vacancies and hollow mesoporous structures. Additionally, a sensing prototype based on the N-C@SnO 2 -Co 3 O 4 HNBs was practically fabricated. The satisfactory sensing response and stability further verified the potential applications in industrial acetone detection. This facile vapor-phase approach sheds light on designing sensing materials with enhanced sensitivity and humidity resistance, as well as device stability simultaneously.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Marimuthu Karpuraranjith,Yuanfu Chen,Sivamoorthy Rajaboopathi,Manigandan Ramadoss,Katam Srinivas,Dongxu Yang,Bin Wang
Herein, a simple, highly efficient and stable MoS 2 nanobox embedded graphitic-C 3 N 4 @TiO 2 (g-CN@TiO 2 ) nanoarchitecture was synthesized by a facile solvothermal approach. The nano-hybrid photocatalyst was constructed by TiO 2 nanoparticles anchored on the surface of g-CN nanosheets. Then highly crystalline three-dimensional porous MoS 2 nanobox was homogeneously distributed on the g-CN@TiO 2 surface. The g-CN@TiO 2 /MoS 2 hybrid achieved a high photocatalytic degradation efficiency of 97.5% for methylene blue (MB) dye pollutant under visible-light irradiant in an hour which was much better than TiO 2 @MoS 2, g-CN@TiO 2, MoS 2, TiO 2 and g-CN. Furthermore, the reaction rate ( k) value of g-CN@TiO 2 /MoS 2 for MB dye is as high as 3.18 X 10 -2 min −1 , which is ~ 2.65 times better than those of g-CN@TiO 2 and MoS 2 . This work presents a rational structure design, interfacial construction and suitable band gap strategy to synthesize advanced nano-hybrid photocatalyst for degradation of organic pollutant with excellent performance and long-term stability.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Xiaocong Gu,Zong Liu,Hui Liu,Chengang Pei,Ligang Feng
Efficient oxygen evolution nano-catalyst is significant for hydrogen generation in the water-splitting reaction. Herein, we demonstrate that fluorination of ZIF-67 Framework templated Prussian blue analogue hollow nano-box is highly efficient for the oxygen evolution reaction (OER). The structure and morphology observation shows the degree of structural transformation and morphology are influenced by the fluorination temperature, and the catalytic ability for OER is correspondingly correlated to these characters. The product obtained at the annealed temperature of 250 °C exhibits the highest catalytic performance for OER with an overpotential of 243 mV (No IR correction) to offer 10 mA cm −2 when loaded on the inert glass carbon electrode, which is much better than that of the commercial IrO 2 catalysts. High catalytic stability and kinetics are also found for the OER. Moreover, it has the highest intrinsic activity as demonstrated by the specific activity and turnover frequency indicating the intrinsic advantages of fluorination and hollow nano-box structure. This study enriches the application of Prussian blue analogue based hollow materials for OER by facile fluorination at low temperatures.
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 31
·2202544
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IF 15.153
Yichao Wang,Meijie Liu,Chunxu Wu,Jiapeng Gao,Min Li,Zipeng Xing,Zhenzi Li,Wei Zhou
Major issues in photocatalysis include improving charge carrier separation efficiency at the interface of semiconductor photocatalysts and rationally developing efficient hierarchical heterostructures. Surface continuous growth deposition is used to make hollow Cu 2-x S nanoboxes, and then simple hydrothermal reaction is used to make core-shell Cu 2-x S@ZnIn 2 S 4 S-scheme heterojunctions. The photothermal and photocatalytic performance of Cu 2-x S@ZnIn 2 S 4 is improved. In an experimental hydrogen production test, the Cu 2-x S@ZnIn 2 S 4 photocatalyst produces 4653.43 µmol h −1 g −1 of hydrogen, which is 137.6 and 13.8 times higher than pure Cu 2-x S and ZnIn 2 S 4 , respectively. Furthermore, the photocatalyst exhibits a high tetracycline degradation efficiency in the water of up to 98.8%. For photocatalytic reactions, the hollow core-shell configuration gives a large specific surface area and more reactive sites. The photocatalytic response range is broadened, infrared light absorption enhanced, the photothermal effect is outstanding, and the photocatalytic process is promoted. Meanwhile, characterizations, degradation studies, active species trapping investigations, energy band structure analysis, and theoretical calculations all reveal that the S-scheme heterojunction can efficiently increase photogenerated carrier separation. This research opens up new possibilities for future S-scheme heterojunction catalyst design and development.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Binghui Du,Danyang Zhao,Tianlin Li,Chenyang Xu,Yongzhi Li,Qing Yin,Fuxiang Wei,Jiqiu Qi,Yanwei Sui
Aiming at the poor intrinsic conductivity and huge volume expansion of transition metal sulfides, carbon-coated cuprous sulfide hollow nanoboxes (Cu 2 S@C) with core–shell structure were designed via co-precipitation, facial carbon coating and in-situ sulfurization methods, and exhibited significantly improved electrochemical properties applied as sodium ion battery anode. The uniformly coated carbon shell can enhance the electrolyte infiltration, promote charge transfer efficiency, accelerate electrochemical conversion redox kinetics. The conversion reaction reversibility of restricted Cu 2 S cores show a significant improvement benefitting from accelebrating ion diffusion and spatial limitation. During the sulfidation, robust chemically and electronically bonded connections such as C-S moieties formed between the two phases, creating interconnected channels that facilliate rapid charge transfer kinetics and optimize structural durability. Moreover, the hollow core–shell structure can provide a buffer space for tolerating volume expansion and preventing agglomeration arising from the repeating Na + insertion/desertion process, which can availably enhance cyclic stability. Thanks to the synergistic effect between strong interfacial coupling and hollow core–shell structure, the Cu 2 S@C composite can deliver an improved Na + storage performance. At the high current density of 1.0 A/g, the Cu 2 S@C anode could exhibit a specific capacity of 100.08 mAh/g, which is significant ameliorative than Cu 2 S counterpart (only 11.6 mAh/g).
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
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2022
·
IF 3.475
Zhenliang Li,Xuerui Liu,Shuye Li,Enke Feng,Zhiqiang Wu,Zhiming Yang,Xinxian Ma,Xinning Han
In view of recent advances in photodegradation of antibiotics, low cost and stable photocatalyst remain rare. In this article, shape-controlled Cu2O@CuS nanocubes with the larger specific surface area were successfully prepared via a simple template-engaged strategy. Cu2O nanocubes were synthesized through a reduction method as original templates, the core-shelled Cu2O@CuS nanocubes were formed by sulphuration with Na2S as sulphur source, and the Cu2O core can be incompletely removed by Na2S2O3 to generate the Cu2O@CuS nanoboxes. Herein, hierarchical nanoboxes with two-layered Cu2O@CuS were used as photocatalyst materials for photocatalytic degradation of tetracycline (TC). The obtained nanocubes manifested high specific surface area (39.65 m2 g−1) and large pore volume (12.3 cm3 g−1). The degradation performance for TC was investigated in detail, including the effect of parameters such as photocatalyst, pH and catalyst dosage. The results indicated that degradation efficiencies were higher than 90% under visible light. Moreover, the degradation efficiency was 71% after six times.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
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2025
·
IF 6.3
Rui Xu,Jingqi Bao,Ningru Xuan,Bingxin Zhou,Lingshan Liao,Qiusheng Zhou,Di Wu,Linfang Lu
The template sacrifice method is a pivotal strategy for synthesizing noble metal-based nanocrystals with enhanced catalytic properties. A critical limitation of this method lies in the challenges associated with regulating the morphology of the resultant nanocrystals. This study demonstrates that the morphology of PtCu nanocrystals can be effectively modulated by adjusting the pH in the Cu 2 O template sacrifice method. Various PtCu nanocrystals, including PtCu hollow nanoboxes and PtCu nanodendrites of differing sizes, have been successfully synthesized. Mechanistic investigations reveal that reduced pH corresponds to a lower electrode potential of Cu 2 O, which enhances its reducing capacity, thereby intensifying the galvanic replacement reaction with the Pt precursor. The driving force of Kirkendall effect during this process can be systematically manipulated via pH adjustments, leading to the generation of PtCu nanocrystals with diverse morphologies. The synthesized PtCu nanocrystals demonstrate significantly improved methanol oxidation reaction activity compared to commercial Pt/C. Specifically, the PtCu hollow nanoboxes exhibit a methanol oxidation reaction (MOR) activity of 1.93 A mg⁻¹, which is 5.4 times greater than that of the commercial Pt/C. Physical characterizations suggest that the superior catalytic performance of PtCu hollow nanoboxes catalyst is attributed to its increased surface electronic density of Pt resulting from the special hollow and porous morphology. The pH control strategy outlined in this research holds promise for the synthesis of other Cu-based nanoalloys with varying morphologies, and may be applicable to other catalytic systems.
研究领域:
材料科学
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催化化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Zhiwen Chen,Siming Fei,Chenghao Wu,Peijun Xin,Shoushuang Huang,Linnéa Selegård,Kajsa Uvdal,Zhangjun Hu
Transition-metal oxides (TMOs) are potential candidates for anode materials of lithium-ion batteries (LIBs) due to their high theoretical capacity (∼1000 mA h/g) and enhanced safety from suppressing the formation of lithium dendrites. However, the poor electron conductivity and the large volume expansion during lithiation/delithiation processes are still the main hurdles for the practical usage of TMOs as anode materials. In this work, the CoSnO3@NC@MnO@NC hierarchical nanobox (CNMN) is then proposed and fabricated to solve those issues. The as-prepared nanobox contains hollow cubic CoSnO3 as a core and dual N-doped carbon-“sandwiched” MnO particles as a shell. As anode materials of LIBs, the hollow and carbon interlayer structures effectively accommodate the volume expansion while dual active TMOs of CoSnO3 and MnO efficiently increase the specific capacity. Notably, the dual-layer structure of N-doped carbons plays a critical functional role in the incorporated composites, where the inner layer serves as a reaction substrate and a spatial barrier and the outer layer offers electron conductivity, enabling more effective involvement of active anode materials in lithium storage, as well as maintaining their high activity during lithium cycling. Subsequently, the as-prepared CNMN exhibits a high specific capacity of 1195 mA h/g after the 200th cycle at 0.1C and an excellent stable reversible capacity of about 876 mA h/g after the 300th cycle at 0.5C with only 0.07 mA h/g fade per cycle after 300 cycles. Even after a 250 times fast charging/discharging cycle both at 5C, it still retains a reversible capacity of 422.6 mA h/g. We ascribe the enhanced lithium storage performances to the novel hierarchical architectures achieved from the rational design.
研究领域:
材料科学
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能源存储
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）