RARE METALS
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2022
·Vol. 42
·期 4
·1175-1185
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IF 6.318
Xiong Qian-Qian,Muhmood Tahir,Zhao Cheng-Xiao,Xu Jing-San,Yang Xiao-Fei
Transition metal-containing MXene has shown great potential in the promising research fields, and its performance strongly depends on the composition, structure, dimension, and surface chemistry. Thus, rational design and controllable synthesis of ultrathin two-dimensional (2D) MXene nanosheets with uniform surface terminations are of great importance. However, the use of 2D MXene, particularly in solar-powered photocatalysis and electrocatalysis, is restricted by the formation of thick, multi-layered MXene flakes with a small interlayer spacing produced from the conventional hydrofluoric acid (HF) etching method. In this work, we report a few-layer MXene nanosheets by solely employing a mixture of lithium fluoride and hydrochloric acid as the etching reagent. Synergic etching and intercalation technique endows MXene with ultrathin 2D nanostructures; moreover, the use of fluoride salt, rather than harmful HF, offers a safer and environmentally-friendly synthetic route for scalable green production of 2D MXene. Both the obtained Ti 3 C 2 T x and Nb 2 CT x nanosheets show a highly efficient photoelectrochemical performance superior to highly stacked MXene flakes. This work highlights a mild, simultaneous etching and delamination strategy for the development of high quality of 2D MXene nanosheets. Graphical abstract
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Si Si,Hua-Shuai Hu,Rui-Jie Liu,Zi-Xiang Xu,Chong-Bin Wang,Yuan-Yuan Feng
The development of non-precious metal catalysts for the electrochemical oxygen evolution reaction (OER) is especially important for the water electrolysis process. Herein, a two-dimensional (2D) ultrathin hybrid Co–NiFe layered double hydroxide (LDH) is synthesized via a facile hydrothermal method . In 1.0 M KOH electrolyte, Co–NiFe LDH exhibits remarkable activities for OER. At the current density of 10 mA cm −2 , it only needs an overpotential of 278 mV, which is ca . 50 mV and 20 mV lower than those for NiFe LDH (328 mV) and RuO 2 catalysts (298 mV), respectively. In addition, Co–NiFe LDH also shows impressive long-term stability for OER. Besides the stable morphology and crystal structure, the potential is always kept at 1.50 V and shows almost no attenuation during the 20 h of durability test. Changes in the electronic structure of LDH due to introduction of Co ions , as well as the large specific surface area facilitate the mass/electron transfer and the oxygen bubbles release, and thus lead to the enhanced catalytic properties for OER. This work can be informative not only for understanding the role of physical and electronic structures on OER but also for designing high-performance non-precious metal OER electrocatalysts .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 31
·12936-12942
·
IF 3.5
Jiaqi He,Xin Deng,Wenting Sun,Wenjing Shang,Yongbing Lou,Jinxi Chen
To address the shortage of fossil energy, the development of affordable and efficient non-precious metal catalysts for oxygen evolution reaction (OER) from electrocatalytic water splitting is still a crucial challenge. Herein, the bimetallic NiFe metal–organic frameworks (MOFs) are synthesized by hydrothermal and electro-deposition. Benefiting from the synergistic effect of Fe and Ni, the catalyst demonstrates extraordinary activity, which exhibits favorable OER catalytic activity in 1 M KOH solution with an overpotential of 206 mV at 10 mA cm−2. Meanwhile, the obtained NiFe-NDC presents promising stability in the 20 h test at 50 mA cm−2.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Sa Wang,Tingting Hu,Guanyun Wang,Zhengdi Wang,Dan Yan,Ruizheng Liang,Chaoliang Tan
Ultrathin two-dimensional (2D) nanosheets (NSs) have been widely explored as nanoagents for multimodal cancer therapies, such as photothermal therapy (PTT) combined with chemodynamic therapy (CDT). However, it is still a challenge to prepare 2D NSs with good performance in both CDT and NIR-II PTT. Here, we report the preparation of ultrathin 2D CuFe 2 S 3 NSs as an efficient nanoagent for synergistic CDT and NIR-II PTT to ablate cancer cells/tumors. Ultrathin 2D CuFe 2 S 3 NSs are first prepared by sulfurization of ultrathin CuFe-LDH NSs via a simple hydrothermal treatment. After modification with polyethylene glycol (PEG), the PEG-modified CuFe 2 S 3 NSs (CuFe 2 S 3 -PEG) show broadband NIR-II absorption and excellent photothermal conversion efficiency (~55.86%) at 1064 nm. Moreover, the overproduced glutathione in the tumor microenvironment can react with CuFe 2 S 3 -PEG NSs to release Fe 2+ and Cu + , thus activating Fenton reaction to efficiently produce hydroxyl radicals (·OH). Importantly, the photothermal effect of CuFe 2 S 3 -PEG could further synergistically improve the Fenton reaction by increasing the local temperature. In vitro and in vivo results reveal that the CuFe 2 S 3 -PEG has remarkable synergistic CDT/PTT antitumor activity. This study has proven that the metal chalcogenide NSs of CuFe 2 S 3 -PEG can be used as an efficient nanoagent for multimodal cancer therapies, which could also be promising in other applications like biosensors, drug delivery and antibacterial.
研究领域:
癌症治疗
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材料科学
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纳米技术
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Mingxuan Huang,Huafeng Wang,Shicong Gui,Chujia Xu,Yi Chen,Shaohua Hu,Yubo Li
Accurate monitoring of ROS levels is essential for oxidative stress (OS) management, but their low concentration and instability pose significant detection challenges. Here, we developed a highly sensitive and selective electrochemical biosensor for real-time, micro-volume ROS detection in leukemia cells. The sensor was fabricated using ultrathin g-C₃N₄-rGO (CN-rGO) nanosheet synthesized through a calcination and hydrothermal approach. These nanosheets were deposited onto a screen-printed carbon electrode (SPE) and further modified with silver nanoparticles (AgNPs) to construct a CN-rGO@AgNPs/SPE biosensor. The porous nanostructure significantly enhanced the catalytic surface area and electron transfer efficiency, achieving high sensitivities towards H₂O₂ and O₂·⁻ detection. Using a window titration platform, the sensor detected ROS in 0.1 mL lysates of leukemia cell lines (U-937, THP-1, and MOLM-13) with concentrations of 7.38 ± 4.81 μM, 11.74 ± 0.985 μM, 19.84 ± 3.73 μM, respectively. Furthermore, the platform allowed precise monitoring of doxorubicin (DOX)-induced OS, providing valuable insights for guiding leukemia chemotherapy. Additionally, Lipopolysaccharide (LPS) stimulation experiments demonstrated the sensor's exceptional real-time performance, enabling dynamic detection of H₂O₂ release kinetics and ROS generation rates at the cellular level. Combining high sensitivity, low detection limits, and micro-volume analysis capabilities, this sensor holds great potential for clinical auxiliary diagnosis and drug efficacy assessment in leukemia research.
研究领域:
生物传感器
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电化学
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纳米技术
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癌症生物学
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活性氧物种
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生物医学工程
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分析化学
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白血病研究
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Chen Zhang,Yingzhang Shi,Zhiwen Wang,Cheng Liu,Yidong Hou,Jinhong Bi,Ling Wu
ZnIn 2 S 4 ultrathin 2D nanosheets with a positive surface charge are synthesized by a hydrothermal method and different contents of surface S vacancies are induced via heat treatment of as-prepared ZnIn 2 S 4 (ZIS). As the S vacancies contents increased, the photocatalytic degradation efficiency of ceftriaxone (CTRX) sodium is promoted. Especially, ZIS-300 shows the best degradation efficiency (88.8%) for an initial CTRX concentration of 10 mg L −1 in 2 h. It is found that S vacancies cause the electron density of surface metal atoms (Zn, In) to be decreased, which makes the effective adsorption and activation of ceftriaxone anions through electrostatic adsorption interactions. Meanwhile, S vacancies also serve as active centers to promote the absorption of O 2 and gather electrons to form •O 2 − species. The photogenerated holes quickly transfer to the surface of the catalyst to directly degrade the adsorbed CTRX. Thus, the photocatalytic CTRX degradation efficiency is significantly improved. Finally, a possible mechanism for over defective ZIS is proposed. This work provides a feasible strategy for the efficient degradation of antibiotics from the perspective of electrostatic adsorption and molecule activation.
研究领域:
环境科学
·
材料科学
·
化学
·
药学
✓ 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）