NANOTECHNOLOGY
·
2024
·Vol. 35
·期 16
·165502
·
IF 2.9
Yongfeng Zhang,Shuainan Liu,Ruiliang Xu,Shengping Ruan,Caixia Liu,Yan Ma,Xin Li,Yu Chen,Jingran Zhou
β-Ga2O3 has been widely investigated for its stability and thermochemical properties. However, the preparation of β-Ga2O3 thin films requires complex growth techniques and high growth temperatures, and this has hindered the application of β-Ga2O3 thin films. In this study, β-Ga2O3 thin films with good crystalline quality were prepared using a green method, and an ultraviolet (UV) detector based on β-Ga2O3 with a photocurrent of 2.54 × 10–6 A and a dark current of 1.19 × 10–8 A has been developed. Two-dimensional materials have become premium materials for applications in optoelectronic devices due to their high conductivity. Here, we use the suitable energy band structure between Nb2C and Ga2O3 to create a high carrier migration barrier, which reduces the dark current of the device by an order of magnitude. In addition, the device exhibits solar-blind detection, high responsiveness (28 A W−1) and good stability. Thus, the Nb2C/β-Ga2O3 heterojunction is expected to be one of the promising devices in the field of UV photoelectric detection.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 21
·16257-16265
·
IF 4.6
Guangyao Zhang,Deqi Fan,Zongze Li,Yingying Li,Yi Lu
Solar-driven interfacial evaporation has emerged as a sustainable solution to address global freshwater scarcity by converting solar energy into thermal energy for efficient water purification. To achieve rapid and energy-efficient steam generation, the development of advanced photothermal materials with optimized light absorption and water activation remains critical. Here, we present a three-dimensional polyvinyl alcohol/chitosan/Nb2C MXene (PCN) hydrogel engineered for high-performance solar evaporation. The composite integrates Nb2C MXene nanosheets into a hydrophilic polymer matrix through hydrogen bonding and electrostatic interactions, forming interconnected microchannels that enable broadband solar absorption (93% across 300–2500 nm) via MXene's plasmonic effects and light-trapping architecture. The synergistic combination of rapid water transport and weakened hydrogen bonding within the hydrated network significantly reduces the evaporation enthalpy to 1426 J g−1. This design achieves an exceptional evaporation rate of 2.72 kg m−2 h−1 and a solar-to-vapor conversion efficiency of 93.2% under 1 sun irradiation, surpassing conventional hydrophilic polymer-based systems. The hydrogel's hierarchical porous structure facilitates effective thermal localization and sustains stable evaporation across varying solar intensities (1–5 sun), demonstrating adaptability for scalable applications. This work provides a rational strategy to design MXene-enhanced hydrogels for practical solar desalination and wastewater purification technologies.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Baolei Shen,Xilin Liao,Xuefei Zhang,Hai-Tao Ren,Jia-Horng Lin,Ching-Wen Lou,Ting-Ting Li
The supercapacitor is a kind of electrochemical energy storage element, has attracted widespread attention, however, it is limited by a lack of ideal electrode materials with excellent cycle stability and high specific capacitance. To address this issue, we prepared Nb 2 CTx MXene-framework coated with Co 3 O 4 to construct a robust 2D cross-linked structure. In this design, the self-assembly of Co 3 O 4 between Nb 2 C MXene layers can effectively prevent the self-stacking of MXene sheets. The high conductivity and abundant active groups on the surface of MXenes provide a large number of active sites for the uniform distribution of Co 3 O 4 on Nb 2 C MXene. The Co-MXene electrode achieves a specific capacitance of up to 1061 F g −1 at the current density of 2 A g −1 , which is higher than the pure Co 3 O 4 electrode and Nb 2 C MXene electrode. The asymmetric supercapacitors (ASCs) of Co-MXene//AC delivers specific energy densities (Es) of 60.3, 42.5, 31.0, 19.7 Wh kg −1 at specific power density (Ps) of 0.67, 2.0, 3.4, and 6.8 kW kg −1 , respectively. The capacitance retention rate of 93% after 1000 cycles at 5 A g −1 . The study provides a valuable guideline for fabricating satisfactory electrochemical energy storage devices by a feasible method.
研究领域:
材料科学
·
能源存储技术
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
Friction
·
2021
·Vol. 10
·期 3
·398-410
·
IF 6.167
Cheng Hao,Zhao Wenjie
Novel two-dimensional (2D) Nb 2 C nanosheets were successfully prepared through a simple lultrasonic and magnetic stirring treatment from the original accordion-like powder. To further study their water-lubrication properties and deal with common oxidation problems, Nb2C nanosheets with different oxidation degrees were prepared and achieved long-term stability in deionized water. Scanning electron microscope (SEM), transmission electron microscope (TEM), scanning probe microscope (SPM), X-ray powder diffraction (XRD), Raman, and X-ray photoelectron spectrometer (XPS) experiments were utilized to characterize the structure, morphology, and dispersion of Nb 2 C nanosheets with different degrees of oxidation. The tribological behaviors of Nb 2 C with different degrees of oxidation as additives for water lubrication were characterized using a UMT-3 friction testing machine. The wear scars formed on the 316 steel surface were measured using three-dimensional (3D) laser scanning confocal microscopy. The tribological results showed that a moderately oxidized Nb 2 C nanosheet, which owned the composition of Nb 2 C/Nb 2 O 5 /C, displayed excellent tribological performance, with the friction coefficient (COF) decreasing by 90.3% and a decrease in the wear rate by 73.1% compared with pure water. Combining the TEM and Raman spectra, it was shown that Nb 2 O 5 nanoparticles filled in the worn zone, and the layered Nb 2 C and C were adsorbed into the surface of the friction pair to form a protective lubricating film. This combined action resulted in an excellent lubricating performance.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Meiling Lian,Yuqing Shi,Wei Zhang,Jingbo Zhao,Da Chen
This work reports the synthesis and application of nitrogen and sulfur co-doped Nb 2 C MXene (NS-Nb 2 C) for the sensing of dopamine (DA) in gastric juice. NS-Nb 2 C MXene was successfully synthesized in a one-step treatment of Nb 2 C using thiourea as N,S resource. The heteroatom doping strategy enables introduction of N,S into MXene nanosheets and simultaneously induces the increased interlayer spacing, high surface area, and enhanced electrical conductivity. It was found that NS-Nb 2 C is more electrochemically active than multilayered Nb 2 C nanosheets (ML-Nb 2 C) and delaminated Nb 2 C nanosheets (DL-Nb 2 C). Based on this, the as-prepared NS-Nb 2 C/Nafion/GCE was used to study the electrochemical behavior of dopamine in pH = 3.0. The sensing interface not only utilizes the unique two-dimensional (2D) nanosheet morphology of Nb 2 C that has a larger surface area and conductive network, but also takes advantage of the more active sites provided by doping. This enables the sensor to achieve ultra-sensitive detection of dopamine (S/N = 3) with a low limit of detection (LOD) of 0.12 µM. In addition, the prepared sensor has good stability and selectivity, and the results of detecting DA in simulated gastric juice is satisfactory. The results indicated that the Nb-based MXenes provided a promising tool for acidic electrochemical sensing applications.
研究领域:
材料科学
·
电化学传感
·
医学检测
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Chao Peng,Ping Wei,Xin Chen,Yongli Zhang,Feng Zhu,Yonghai Cao,Hongjuan Wang,Hao Yu,Feng Peng
2D MXenes have attracted extensive attentions owing to their anisotropy, high conductivity and other extraordinary properties. The popular preparation method of MXenes usually involves HF in high concentrations, which has seriously restricted their pervasive applications. In this work, a new hydrothermal route with low-toxicity etching agents (NaBF 4 , HCl) was used to synthesize Ti 3 C 2 MXene ( h- Ti 3 C 2 ). Compared with the Ti 3 C 2 prepared by the traditional HF etching method ( t- Ti 3 C 2 ), the h- Ti 3 C 2 has the higher c lattice parameter , larger interlayer distance and larger BET specific surface area, because of the slow release mechanism during the hydrothermal process. The hydrothermal etching method not only avoided the use of high-concentration HF, but also was more efficient to prepare Ti 3 C 2 flakes. Moreover, the hydrothermal etching route can be extended to other MXene materials, e.g. Nb 2 C. We demonstrated that the h -MXenes have better adsorption performance of methylene blue and methyl orange dyes. The hydrothermal etching route proposed in this study enabled the environmental benign and high efficiency exfoliation of MXenes, displaying the promise to facilely prepare 2D MXenes and paving a way to their widespread applications.
研究领域:
材料科学
·
纳米材料
·
环境功能材料
·
表面化学
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fangxian Wang,Junwei Yang,Shihao Li,Junwen Liang,Yuwei Wang,Rong Du,Bo Zhou,Qiong Liu,Changping Li
Bromate is a commonly identified carcinogenic and genotoxic disinfection byproduct in water. Electrochemical debromination is an environmentally friendly and effective approach but it often suffers the limited reducing atomic H (H*) ability and high metal catalyst dosage. In this study, a unique composite catalyst comprised of ultra-low loading Cu single atoms (0.016 wt%) and Fe 2 O 3 nanoparticles supported on a Nb 2 C MXene (denoted as Cu 0.2 /Fe 0.1 /Nb 2 C) was synthesized by one-step high-temperature molten salt method. The Cu 0.2 /Fe 0.1 /Nb 2 C significantly outperformed the Nb 2 C, Cu 0.2 /Nb 2 C and Fe 0.1 /Nb 2 C counterparts in the electrochemical debromination with a 94.2 % removal efficiency of bromate. It is revealed that the introducing of Cu single atoms, efficiently promotes the adsorption of H* and inhibition of competitive H 2 evolution. The incorporation of Fe 2 O 3 nanoparticles significantly increased the electronic metal-support interaction effect between the metal components and Nb 2 C, thereby forming a noticeable electronic cloud bridge to facilitate efficient charge transfer. Ultimately, the synergistic interplay between Cu single atoms and Fe 2 O 3 nanoparticles plays a crucial role in achieving the remarkable removal performance of bromate. This work not only presents a significant instance of a synergistic catalyst involving metal single atoms and metal nanoparticles for effective electrochemical debromination but also advances the understanding of the electronic metal-support interaction.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiafeng Xi,Xiaojuan Liu,Liang Zhang,Zuwang Zhang,Junchen Zhuo,Ting Du,Yajie Zhang,Jinyou Duan,Hongliang Dong,Jianlong Wang
Within the illustrious and renowned MXene family, Niobium carbide (Nb 2 C) has astounded researchers by exhibiting an extraordinary level of photothermal conversion efficiency and photothermal stability, all while maintaining the possibility of biodegradability. However, the absence of band gaps hindered Nb 2 C as an attractive photoresponsive material for sterilization purposes. To overcome this obstacle, we engineered a Schottky heterojunction in Nb 2 C by introducing Ru and Bi 2 S 3 based on the work function theory to generate an internal electric field (IEF) in Ru@Bi 2 S 3 /Nb 2 C, thus enhancing the photocatalytic sterilization performance by improving the charge transfer efficiency. The strategic doping of Ru also improved the carrier separation as an electron trap, apart from enhancing the light absorption efficiency by exploiting the Localized Surface Plasmon Resonance (LSPR). The results of Ultraviolet Photoelectron Spectroscopy (UPS) and X-ray photoelectron spectroscopy (XPS) divulge the stark difference in work function, which facilitates the directional transfer of carrier and subsequently augments the formation of Schottky heterojunction. This unique structure which is beneficial to the generation of reactive oxygen species (ROS). As a result, the in vitro sterilizing efficiency of the Ru@Bi 2 S 3 /Nb 2 C exceeds 99.87%, and in vivo experiments demonstrated wound healing effects in mouse wound models. These results have confirmed the significant implications of Schottky heterojunction for the use of Nb 2 C in the biomedical sector.
研究领域:
材料科学
·
生物医学工程
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Tingting Mao,Fang Zhou,Kai Han,Ying Xie,Jue Wang,Lichang Wang
Potassium ion battery (PIBs) is in the primary stage of development, exploring appropriate electrode materials is the key to obtain high performance and practical application. Herein, we design a self-standing reduced graphene (rGO) and Nb 2 C MXene (3D-rGO/Nb 2 C) composite paper electrode with three-dimensional porous conductive network by electrostatic absorption self-assembly method. Compared with the compact structure of L-rGO/Nb 2 C paper electrode via layer-by-layer vacuum filtration approach, the structure design in which the wrinkled rGO is applied as the framework provides a large number of surface active sites and promotes the rapid transfer of K + to improve the storage capacity and kinetics of potassium ions . Moreover, the 3D-rGO/Nb 2 C hybrid paper with large specific surface area can effectively accommodate the volume expansion during charging and discharging process and ensure the cycle stability. At current density of 500 mA g −1 , the 3D-rGO/Nb 2 C hybrid paper electrode delivers an initial capacity of 207 mAh·g −1 , which is maintained at 139 mAh·g −1 after 1000 cycles. The 3D-rGO/Nb 2 C hybrid paper combines both diffusion mechanism and pseudo-capacitance mechanism, which significantly improves its electrochemical performance in K-ion storage. These results show the good potential of the 3D-rGO/Nb 2 C hybrid paper as a high-performance electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Tian Liu,Guoqiang Tan,Shuaijun Feng,Bixin Zhang,Ying Liu,Zeqiong Wang,Yu Bi,Qian Yang,Ao Xia,Wenlong Liu,Huijun Ren,Long Lv
Nb 2 AlC/Nb 2 C MXene (NAC/NC) heterojunction photocatalysts with Schottky junctions were obtained by selective etching of the Al layer, resulting in 146.25 μmol·g −1 electrons and 15.28 μmol·g −1 holes stored in the heterojunction. The average conversion of NAC/NC thermally coupled photocatalytic reduction of CO 2 under the simulated solar irradiation reached 110.15 μmol⋅g −1 ⋅h −1 , and the CO selectivity reached over 92%, which was 1.49 and 1.74 times higher than that of pure Nb 2 AlC and Nb 2 C MXene, respectively. After light excitation, the localized surface plasmon resonance (LSPR) effect of holes distributed on the surface of Nb 2 C MXene crystals in the heterojunction will form high-energy thermal holes to dissociate H 2 to H + and reduce CO 2 to form H 2 O at the same time. The high-energy electrons formed by the LSPR effect of Nb 2 C MXene and the conduction band electrons generated by the photoexcitation of Nb 2 C MXene can be migrated to Nb 2 AlC under the action of the interfacial Schottky junction to supplement the electrons needed for the LSPR effect of Nb 2 AlC, which continuously forms high-energy hot electrons to convert the adsorbed CO 2 into *CO 2− , b-HCO 3 , and HCOO. Subsequently, HCOO releases ⋅OH in a cyclic reaction to continuously reduce to form CO. The dual LSPR effect of Nb 2 AlC and Nb 2 C MXene is used to enhance the hydrogenation activity of thermally coupled photocatalytic reduction of CO 2 , which provides a new research idea for the application of MXene in thermally coupled photoreduction of CO 2 .
研究领域:
材料科学
·
环境科学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Zhaohua Jiang,Shiyuan Fan,Huiting Xu,Huibin Liu,Sai Dong,Jing Li,Xiaoteng Yan,Zhijie Cui,Wenchao Peng,Wen Liu,Jiapeng Liu
Aqueous copper-selenium (Cu-Se) battery based on conversion mechanism have garnered interest due to their intrinsic safety features and high specific capacity. However, the slow conversion kinetics presents a challenge for its development. Herein, catalytic host material of NbSe 2 @few-layered Nb 2 C (NbSe 2 @f-Nb 2 C) heterostructure with built-in electric field (BIEF) is prepared by in situ selenization strategy for aqueous Cu-Se battery. Benefiting from the high electrical conductivity of f-Nb 2 C MXene, the high electrocatalytic performance of NbSe 2 and the spontaneous BIEF between NbSe 2 and f-Nb 2 C MXene, the Se redox reactions kinetics is enhanced and the reaction barrier is reduced. Consequently, the specific capacity of Se/NbSe 2 @f-Nb 2 C cathode can reach 1128 mAh g −1 at 0.25 A g −1 with stable cycling performance. Additionally, the conversion mechanism is investigated via comprehensive characterizations and density functional theory calculations. This study provides an innovative approach for designing high performance MXene-based catalytic host materials to enhance the conversion kinetics of aqueous Cu-Se batteries.
研究领域:
储能
·
材料科学
·
电化学
·
纳米技术
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Ziheng Yang,Li Jiang,Weidan Zhao,Boya Shi,Xiangwen Qu,Yekai Zheng,Pengwei Zhou
Recent years, two-dimensional transition metal carbonitrides (MXene) have attracted much attention in the field of surface-enhanced Raman scattering (SERS). However, the relatively low enhancement of MXene is a major challenge. Herein, Nb 2 C-Au NPs nanocomposites were prepared by electrostatic self-assembly method, which have a synergistically conjugated SERS effect. The EM hot spots of Nb 2 C-Au NPs are significantly enlarged and expanded, while the surface Fermi level is decreased. This synergistic effect could improve the SERS performance of the system. Consequently, for the dye molecules CV and MeB, the detection limits reach 10 −10 M and 10 −9 M, respectively, while for biomolecule adenine, the detection limit is as low as 5 × 10 −8 M. The results also show the good concentration-dependent linearity, uniformity, reproducibility and stability of SERS substrate. Nb 2 C-Au NPs could be a fast, sensitive and stable SERS platform for label-free and non-destructive detection. This work may expand the application of MXene based materials in the field of SERS.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）