NANOTECHNOLOGY
·
2020
·Vol. 31
·期 20
·205604
·
IF 3.551
Lun Zhang,Juanjuan Yin,Kuo Wei,Bingfan Li,Tifeng Jiao,Yan Chen,Jingxin Zhou,Qiuming Peng
The construction of low-cost, high-performance electrocatalysts instead of platinum catalysts is critical to solving the energy crisis. Here, using simple electrospinning and hydrothermal methods, new MoS2 nanosheets on SrTiO3 nanofibers (NFs) and 2D SrTiO3@MoS2 heterostructure NFs are synthesized. In addition, SrTiO3@MoS2 heterostructure NFs are compared with bare SrTiO3 NFs and MoS2 nanosheets. Importantly, the prepared SrTiO3@MoS2 heterostructure shows better hydrogen-evolution reaction performance than other MoS2-based electrocatalysts with an overpotential of 165 mV at 10 mA cm−2, a Tafel slope of 81.41 mV dec−1, and long-term electrochemical durability of 3000 cycles. Therefore, the present work strongly demonstrates the positive synergy between SrTiO3 NFs and layered MoS2, and also provides a strategy for preparing low-cost and high-activity water-decomposition electrocatalysts.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Hengyi Chen,Minghao Hu,Peng Jing,Baocang Liu,Rui Gao,Jun Zhang
Transition metal disulfides (TMD) are considered as promising catalysts for hydrogen evolution reaction (HER) due to their unique structural and electronic properties. However, as a representative, the tungsten disulfide (WS 2 ) shows an insufficient HER performance and is still needed to be further improved. Herein, we report the synthesis of CeO 2 -modified WS 2 nanosheets with abundant heterostructures on carbon cloth (CeO 2 /WS 2 /CC) as an efficient self-supported integral electrode for HER. Experimental results and theoretical calculations imply that the intimate electronic interaction between CeO 2 and WS 2 promotes the production of more oxygen vacancies in CeO 2 to regulate the electronic structure of WS 2 , endowing extra active sites, high electron transfer efficiency, and downshifted d-band center of W, which can lead to thermoneutral hydrogen adsorption Gibbs free energies (ΔG H* ) and thus boosts HER. The optimized CeO 2 /WS 2 /CC electrode displays an improved HER performance with an overpotential of 128 mV at 10 mA cm −2 in 0.5 M H 2 SO 4 aqueous solution, 87 mV smaller than that of the WS 2 /CC electrode. Meanwhile, it also could maintain a 20 h of stable HER activity. Our work provides an effective approach to achieve various hybrid catalysts of rare earth compounds-transition metal compounds with highly active sites for superior electrocatalysis .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chao Yue Zhang,Zhong Wei Lu,Yu Hai Wang,Zhe Dai,Hao Zhao,Geng Zhi Sun,Wei Lan,Xiao Jun Pan,Jin Yuan Zhou,Er Qing Xie
Many heterostructures containing two types of strong polar bonds were often designed to synergistically increase the chemical confining for soluble lithium polysulfide in lithium-sulfur batteries (LSBs). To make maximum use of the two chemical interactions on confining the polysulfides, a novel structure of 2D hexagonal WS 2 -rimmed Co 9 S 8 heterostructure nanoflakes was designed on the surface of carbon nanofiber (CNF) skeletons via a simple technique. The composite nanoflakes are ~50 nm in diameter and ~5 nm in thickness, and comprised of a ~40-nm Co 9 S 8 core and a 3–4 WS 2 edge. In this design, the Co 9 S 8 core and WS 2 edge can confine the polysulfides and catalyze the electrochemical progresses at the same time. Electrochemical tests indicated that the CNF@WS 2 @Co 9 S 8 -S cathodes show a high capacity (1175 mAh g −1 at 0.1 C), an excellent rate capability (keep 77.85% at 2.0 C), and a superior cycling stability (a low decay rate of 0.061% per cycle at 2.0 C, even lower at 7.0 C and 12.0 C).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Yanping Wang,Hua Yang,Xiaofeng Sun,Haimin Zhang,Tao Xian
We reported the preparation of new ternary n-BaTiO 3 /Ag/p-AgBr heterostructured photocatalysts and their promising photocatalytic application for the dye degradation. The ternary n-BaTiO 3 /Ag/p-AgBr heterostructured photocatalysts are constructed by coupling n-type BaTiO 3 and p-type AgBr particles onto Ag nanowires. Various methods including XRD, SEM, TEM, XPS, FTIR, UV–vis diffuse reflectance spectroscopy, PL spectroscopy, photocurrent response and EIS were used to characterize the as-prepared photocatalysts. The photodegradation performances of the photocatalysts were assessed by using RhB as the model pollutant and simulated sunlight as the light source. It is demonstrated that the n-BaTiO 3 /Ag/p-AgBr ternary composite photocatalysts exhibit excellent photodegradation performances superior to bare BaTiO 3 and AgBr particles. Particularly, the 20 %BTO/1.2 %Ag/AgBr composite can photocatalyze 99.3 % removal of RhB after 12 min photoreaction, and has a photodegradation activity which is about 3.1 times larger than that of bare AgBr particles. The underlying photodegradation mechanism of the ternary composite photocatalysts was investigated and discussed.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jie Xu,Xueying Yang,Yongjin Zou,Luping Zhu,Fen Xu,Lixian Sun,Cuili Xiang,Jian Zhang
MXenes have a broad application in electrochemical energy storage. However, the smooth surface of high-density MXenes makes it difficult to stabilize the anchored active material. In this study, ultrathin Ti 3 C 2 MXenes were doped with a high density of NiMoS 4 nanoparticles with the assistance of dopamine (DA). DA was adsorbed by the Ti 3 C 2 surface (Ti 3 C 2 -DA) to form a negatively charged layer, which was beneficial for the enrichment of metal ions. NiMoS 4 was anchored to Ti 3 C 2 -DA via a hydrothermal reaction . The resultant Ti 3 C 2 -DA-NiMoS 4 heterostructure increased the exposure of NiMoS 4 active sites, and reduced the decrease in specific capacitance caused by volume changes. Consequently, Ti 3 C 2 -DA-NiMoS 4 exhibited excellent electrochemical performance with a high specific capacitance of 1288 F g −1 at 1 A g −1 . In addition, an asymmetric supercapacitor based on a Ti 3 C 2 -DA-NiMoS 4 positive electrode achieved a high energy density of 40.5 Wh kg −1 at 810 W kg −1 , and demonstrated excellent cycling stability (capacitance retention of 89% after 9000 cycles at 10 A g −1 ). These results demonstrate that the Ti 3 C 2 -DA-NiMoS 4 heterostructure is a prospective candidate material for high-performance supercapacitors.
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Ruiyang Yu,Hui Qiao,Zongyu Huang,Pinghua Tang,Xiang Qi
Ti2CTx is a typical 2D layered semiconductor material with a high carrier mobility and intriguing photodetector performance. In this work, a Ti2CTx/W18O49 heterostructure was fabricated via a simple one-pot hydrothermal method. The photoelectrochemical (PEC)-type photodetector was constructed by using the as-prepared composite as the electrode material. The Ti2CTx/W18O49 heterostructure clearly exhibited a significant increase in photoresponse compared to that of solitary Ti2CTx and W18O49, as shown by the results of the PEC tests. This demonstrates how the Ti2CTx and W18O49 interface effectively generates and transfers photocarriers, which can enhance the photoresponse performance. Additionally, the constructed Ti2CTx/W18O49 heterostructure-based photodetector’s photocurrent density can practically linearly increase as the irradiation power density rises. The photocurrent density and photoresponsivity can reach 1.42 μA/cm2 and 19.6 μA/W at 0.6 V, respectively. The prepared Ti2CTx/W18O49 heterostructure-based photodetector also shows excellent cycle stability; after more than 2500 s and 125 on/off cycles, the photocurrent shows no obvious attenuation. The superb PEC-type photodetector performance of a Ti2CTx/W18O49 heterostructure holds much promise for photodetection.
研究领域:
材料科学
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zi-Han Zhang,Tao Yang,Ze-Yuan Wang,Hai-Chao Wang,Xin-Zheng Yue,Sha-Sha Yi
The photoelectrochemical (PEC) performance of hematite ( α -Fe 2 O 3 )-based photoanodes is still far from its theoretical value because they are constrained by serious charge recombination and sluggish water oxidation kinetics. Herein, we developed a heterostructural photoanode by coating boron doped graphite carbon nitride nanolayers onto an Fe 2 O 3 nanoarray (BCN/Fe 2 O 3 ), followed by modification with NiCo(OH) x cocatalyst. The constructed NiCo(OH) x /BCN/Fe 2 O 3 demonstrates a significantly improved photocurrent density of 2.7 mA cm −2 at 1.23 V RHE (V versus reversible hydrogen electrode), which is 3.2 times higher than that of pristine Fe 2 O 3 . Additionally, it exhibits an extremely negative onset potential of 0.60 V RHE . Detailed studies reveal that the BCN/Fe 2 O 3 heterojunction endows a driving force for charge separation and establishes a direct pathway for their transport, while NiCo(OH) x acts as a cocatalyst to accelerate the surface water oxidation reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jiao Hu,Tiantian Zhao,Xue Li,Guangzhi Hu
The electrocatalytic conversion of nitrate (NO 3 − ) to nitrogen (N 2 ) is a promising strategy for addressing the global issue of NO 3 − pollution in surface water and groundwater. However, the scarcity of efficient denitrification catalysts hinders the development of the aforementioned process, particularly at low NO 3 − concentrations. Herein, a self-supporting array of defect-rich heterostructured nanowires (Ni 0.8 Cu 0.2 O@CuO@NF) was synthesized for highly selective reduction of NO 3 − to N 2 . The introduction of Cu accelerated the rate-limiting step (NO 3 − to NO 2 − ), and the presence of defect-rich heterojunctions increased the catalytic active sites of the catalyst, thereby accelerating the reduction of NO 3 − and improving the selectivity towards N 2 . Ni 0.8 Cu 0.2 O@CuO@NF exhibited excellent denitrification capacity, with approximately 100% of NO 3 − degradation and 99.9% of N 2 selectivity under optimum parameter conditions, as well as ultra-high stability during the 8-cycle test. Significantly, NO 3 − conversion and N 2 selectivity for actual wastewater with complex ingredients were 70.7% and 99.1%, respectively. This study presents a novel concept for the development of cost-effective and highly effective catalysts for water and environmental restoration.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Hao Wang,Yao Wen,Xiaolin Zhang,Baoxing Zhai,Ruiqing Cheng,Lei Yin,Yiling Yu,Yesheng Li,Jian Jiang,Hao Zhu,Jun He
Two-dimensional (2D) materials provide a versatile platform for the integration of diverse crystals, enabling the formation of heterostructures with intriguing functionalities. Coherently growing 2D heterostructures are highly desirable for property manipulation due to their strong interfacial interaction. In this work, we propose a general synthesis approach and provide insight into well-designed 2D binary–ternary magnetic heterostructures. Atomically sharp interfaces were achieved in typical lateral and vertical Cr1+mSe2(001)/CuCr2Se4(111) heterostructures owing to their similar lattice arrangement, with the observation of a significant enhancement of optical second-harmonic generation. Further magnetism measurements revealed a Curie temperature up to 360 K and thickness- and temperature-dependent magnetism in this heterostructure. Additionally, we synthesized three analogous 2D magnetic heterostructures in Fe–Cr–S, Co–Cr–S, and Cu–Cr–S systems, demonstrating the ubiquitous nature of the coherent heteroepitaxy. Our work involves the development of an innovative platform for investigating the underlying physics and potential applications of 2D binary–ternary heterostructures as well as the fabrication of associated functional devices.
研究领域:
材料科学
·
物理学
·
纳米技术
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xin Guo,Hao Zhang,Ke Chen,Xiaodie Li,Xuran Yang,Chengming Xiao,Yiyuan Yao,Minjie Song,Junwen Qi,Yujun Zhou,Yue Yang,Zhigao Zhu,Jiansheng Li
Rational design of high-performance electrode materials is crucial for enhancing desalination performance of capacitive deionization (CDI). Here, ultrathin nitrogen-doped carbon/Ti 3 C 2 T x -TiN (NC/MX-TiN) heterostructure was developed by pyrolyzing zeolite imidazolate framework-8 (ZIF-8) nanoparticles sandwiched MXene (ZSM), which were formed by assembling ultrafine ZIF-8 nanoparticles with size of 20 nm on both sides of MXene nanosheets. The introduction of ultrasmall ZIF-8 particles allowed for in situ nitridation of the MXene during pyrolysis, forming consecutive TiN layers tightly connected to the internal MXene. The two-dimensional (2D) heterostructure exhibited remarkable properties, including high specific surface area and excellent conductivity. Additionally, the resulting TiN demonstrated exceptional redox capability, which significantly enhanced the performance of CDI and ensured cycling stability. Benefiting from these advantages, the NC/MX-TiN exhibited a maximum adsorption capacity of 45.6 mg g −1 and a steady cycling performance in oxygenated saline water over 50 cycles. This work explores the rational design and construction of MXene-based 2D heterostructure and broadens new horizons for the development of novel CDI electrode materials.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 39
·5574-5584
·
IF 2.6
Manshu Han,Yirong Zhao,Yongfeng Bai,Yu Li,Minghua Chen,Qingguo Chen
Bi-based materials can retain massive amounts of sodium ions through alloying and conversion reactions, resulting in excellent theoretical capacity. However, during the sodiation/desodiation process, there is always a significant volume change in the alloying reaction. In this work, TiO2-coated hexagonal-phase topological insulator (TI) Bi2Te3 composites grown on carbon cloth (CC) were prepared using a solvothermal reaction and an atomic layer deposition process (TiO2/Bi2Te3/CC) as anode materials for sodium-ion batteries without the need for a binder. Compared to the pure Bi2Te3 electrode, the optimized TiO2/Bi2Te3/CC composite exhibits a superior specific capacity of 450 mA h g−1, a high rate performance of 0.1 A g−1, and a high cycling stability of 100 cycles due to the inherent properties of TIs, contributed by the effective TiO2 cladding layer and large interfacial spacing of Bi2Te3. The enhanced reversible capacitance, rate capability, and cycling performances can be attributed to the heterointerfaces and excellent mechanical properties of TiO2, which balance the electronic structure of the building blocks and inhibit the detaching of Bi2Te3 due to large internal stresses. The amorphous TiO2/Bi2Te3/CC composite was treated in a tubular furnace to obtain crystalline TiO2/Bi2Te3/CC, and the electrochemical performance of the heterostructures formed by the TiO2 coating layer with different properties was compared. This work demonstrates the enormous potential for enhancing the sodium-ion storage capabilities of alloy electrode materials by constructing heterostructures.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Hui Xue,Jingli Yin,Weifeng Li,Yumei Long
The exploration of enzyme-mimic nanocomposites to replace commercial enzymes is challenging in the construction of biosensors with high performance. Herein, an ultrafast response nonenzymatic glucose sensor was developed based on a Cu2O–TiO2/Ti3C2Tx nanocomposite, which was prepared via an in situ redox procedure using Ti3C2Tx nanosheets both as a reducing agent and a carrier substrate. Structural characterizations, including X-ray diffraction (XRD) and transmission electron microscopy (TEM), revealed that Cu2O nanoparticles with a size of 10–30 nm are uniformly distributed on the surface of the Ti3C2Tx nanosheets and form close contacts through Ti–O–Cu bonds, resulting in favorable stability of the system. The unique heterostructure of Cu2O–TiO2/Ti3C2Tx can produce abundant active sites and facilitate electron transfer, demonstrating enhanced catalytic activity in the electrooxidation of glucose. Consequently, the electrochemical sensor fabricated by modifying a glassy carbon electrode (GCE) with Cu2O–TiO2/Ti3C2Tx nanocomposites exhibited excellent analytical properties for glucose detection, including a fast response time of 0.1 s, a low detection limit of 0.67 μM, and a high sensitivity of 267 μA mM–1 cm–2. In addition, the developed method possesses good anti-interference ability and superior stability and thus has been successfully applied for real sample monitoring. This study offers a way to construct Ti3C2Tx-based heterostructures with tunable physiochemical properties and expands their use in the electrochemical field.
研究领域:
材料科学
·
电化学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）