ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Wenzhong Wang,Xuting Bai,Hao Zhou,Jiajia Shan,Xue Wang
The synthesis of carbon quantum dots (CQDs) from renewable resources is extensively regarded as a green approach, but this method is generally accompanied by high energy consumption and complex byproducts, which limit the large-scale production of CQDs. In this work, titanium carbide-derived CQDs (TiC-CQDs) were synthesized only by mixing titanium carbide and hydrogen peroxide (1 wt %) at room temperature. The resulting byproduct was converted to a precipitate by sodium hydroxide to purify the TiC-CQDs, and the reaction mechanism was further explored. The average lateral size of TiC-CQDs is 4.2 ± 1.1 nm and shows excellent fluorescence properties. Moreover, in an acetic acid-sodium acetate buffer solution, the fluorescence of TiC-CQDs could be selectively quenched by a ferric ion (Fe3+) with a broad concentration range of 0.2–5 μM and 5–60 μM and a detection limit as low as 0.14 μM. Due to the absence of the energy input, complex equipment, and nontoxic and harmless precursors, the novel room-temperature synthesis route of TiC-CQDs is energy-efficient, safe, green, and economical, and has great potential in industrial application.
研究领域:
材料科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 3
·141
·
IF 3.504
Guangyin Fan,Xiaojing Li,Caili Xu,Weidong Jiang,Yun Zhang,Daojiang Gao,Jian Bi,Yi Wang
Developing highly efficient and recyclable catalysts for the transformation of toxic organic contaminates still remains a challenge. Herein, Titanium Carbide (Ti3C2) MXene modified by alkali treatment process was selected as a support (designated as alk-Ti3C2X2, where X represents the surface terminations) for the synthesis of Pd/alk-Ti3C2X2. Results show that the alkali treatment leads to the increase of surface area and surface oxygen-containing groups of Ti3C2X2, thereby facilitating the dispersion and stabilization of Pd species on the surface of alk-Ti3C2X2. The Pd/alk-Ti3C2X2catalyst shows excellent catalytic activity for the hydrodechlorination of 4-chlorophenol and the hydrogenation of 4-nitrophenol in aqueous solution at 25 °C and hydrogen balloon pressure. High initial reaction rates of 216.6 and 126.3 min−1·gpd−1are observed for the hydrodechlorination of 4-chlorophenol and hydrogenation of 4-nitrophenol, respectively. Most importantly, Pd/alk-Ti3C2X2exhibits excellent stability and recyclability in both reactions without any promoters. The superior property of Pd/alk-Ti3C2X2makes it as a potential material for practical applications.Keywords:palladium;titanium carbide;catalytic transformation;4-chlorophenol;4-nitrophenol
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 10
·3966-3973
·
IF 9.8
Huajian Feng,Qingyong Tian,Junhao Huang,Xinwei Cui,Jingyun Jiang,Yapeng Tian,Li Ye,Qun Xu
Two-dimensional (2D) transition metal carbides, nitrides, or carbonitrides, regarded as MXenes, hold great promise for an extensive range of applications such as efficient catalysis and energy conversion and storage materials. Up to now, various strategies for synthesizing MXenes have been explored, typically including an F-containing aqueous etching process, a molten salt etching method, etc. In this work, for the first time, we have designed a novel solid-phase etching approach to synthesize two-dimensional titanium carbide (MXenes) sheets with the assistance of supercritical CO2 (SC CO2), and the solid-phase etching mechanism behind the efficient fabrication process has also been revealed from a series of characterization methods. It is demonstrated that SC CO2-coated FeF3·3H2O can successfully help realize the delamination of multilayer MXenes into single-layer or few-layer MXenes, and at the same time, the as-prepared MXene sheets are demonstrated to have large surface area and size, high quality and rich fluorine termination groups, which make them efficient in the alkaline hydrogen evolution reaction (HER).
研究领域:
材料科学
·
催化
·
能量转换与存储
✓ 已验证
DOI
高影响因子
COMBUSTION AND FLAME
·
2025
·
IF 6.2
Jiang Liu,Jiuyu Chen,Yunlan Sun,Tianyu Yang,Baozhong Zhu
Polyvinylidene fluoride (PVDF) is a common fluorine-containing compound that can effectively reduce the aggregation of aluminum (Al) powder. However, the Al@PVDF system suffers from low energy density and low combustion intensity. To address these issues, it was modified with PVDF and titanium carbide (TiC) by using an anti-solvent method. The effects of different proportions of PVDF and TiC on the combustion properties of Al powder were studied. There is a synergistic effect between TiC and PVDF in improving the combustion performance of Al powder. Replacing a small amount of PVDF in Al@PVDF with TiC can not only reduce its ignition delay and agglomeration size, but also enhance the combustion performance because TiC predominates in reacting with Al 2 O 3 , which reduces the PVDF consumption and improves the reaction between PVDF and Al.
研究领域:
材料科学
·
燃烧化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jun Han,Junhui Shao,Xingchen He,Najun Li,Shuxian Wang,Dongyun Chen,Jianmei Lu
Constructing heterojunctions has been proved to effectively improve the carrier transfer capability for enhanced catalytic activity. Herein, Ti 3 C 2 /BaTiO 3 heterojunctions were fabricated through self-assembly driven by hydrogen bonding between piezoelectric barium titanate (BaTiO 3 ) stabilized by oleic acid molecules and titanium carbide (Ti 3 C 2 ) with surficial functional groups under continuous ultrasonic vibration. Owing to the formation of heterojunction, the separation of free charges can be promoted by the conductive Ti 3 C 2 . Additionally, the recombination of electrons and holes pairs in BaTiO 3 can be hindered by built-in piezoelectric field. Hence, the piezocatalytic activity of Ti 3 C 2 /BaTiO 3 was significantly enhanced by the accumulated piezoelectric effect, maintaining stability during the piezocatalytic degradation of bisphenol A and achieving rate constants that were 22.2 and 3.2 times higher than those of Ti 3 C 2 and BaTiO 3 , respectively. This work thus presents a novel strategy for designing high-activity heterojunction piezocatalysts through hydrogen bonding self-assembly.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhangfeng Shen,Yang Yang,Yuji Li,Xiaohua Cheng,Huayang Zhang,Xuhui Zou,Ming Qiu,Hong Huang,Hu Pan,Qineng Xia,Zhigang Ge,Yongyong Cao,Jing Gao,Yangang Wang
Despite great efforts that have been made, photocatalytic carbon dioxide (CO 2 ) reduction still faces enormous challenges due to the sluggish kinetics or disadvantageous thermodynamics. Herein, cadmium sulfide quantum dots (CdS QDs) were loaded onto carbon, oxygen-doped boron nitride (BN) and encapsulated by titanium carbide (Ti 3 C 2 , MXene) layers to construct a ternary composite. The uniform distribution of CdS QDs and the tight interfacial interaction among the three components could be achieved by adjusting the loading amounts of CdS QDs and MXene. The ternary 100MX/CQ/BN sample gave a productive rate of 2.45 and 0.44 μmol g -1 h −1 for carbon monoxide (CO) and methane (CH 4 ), respectively. This CO yield is 1.93 and 6.13 times higher than that of CdS QDs/BN and BN counterparts. The photocatalytic durability of the ternary composite is significantly improved compared with CdS QDs/BN because MXene can protect CdS from photocorrosion. The characterization results demonstrate that the excellent CO 2 adsorption and activation capabilities of BN, the visible light absorption of CdS QDs, the good conductivity of MXene and the well-matched energy band alignment jointly promote the photocatalytic performance of the ternary catalyst.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Chang Xu,Xuan Zhao,Mengyao Sun,Jingyuan Ma,Mingxing Wu
In the present study, two typical 2D layered MXenes, i.e., Titanium carbide (Ti 3 C 2 ) and Vanadium carbide (V 2 C) are synthesized via a simple etching method under lower temperature as counter electrode catalysts to achieve the iodide redox couple regeneration in dye-sensitized solar cells. As indicated from the result, Ti 3 C 2 significantly outperforms V 2 C, and the device by exploiting Ti 3 C 2 counter electrode achieves power conversion efficiency (PCE) of 5.3%, while the device by applying V 2 C counter electrode only exhibits a poor PCE of 4.0%. To improve the catalytic activity of the prepared Ti 3 C 2 , the effect of etching time on the catalytic activity has been evaluated, which demonstrates that Ti 3 C 2 etched 24 h exhibits the highest catalytic activity, and the device generates a PCE of 6.2%. Lastly, the catalytic activity of the Ti 3 C 2 is further improved by postprocessing with KOH aqueous solutions, and the PCE value is up-regulated to 7.1%. The high catalytic behavior of Ti 3 C 2 could be attributed to the prominent charge transfer and mass transport properties caused by the specific 2D layer structure, suggesting a potential candidate to the noble metal electrodes.
研究领域:
材料科学
·
能源科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 11
·7392-7397
·
IF 1.093
Liu Tong,Wang Qing-Tao,Sun Yong-Heng,Zhao Mei
Herein, we successfully immobilized non-noble Co nanoparticles on titanium carbides (MXene) for the hydrolysis of ammonia borane by a simple co-reduction route. The synthesized Co nanoparticles with the size of 3.2 nm were monodispersed on MXene surface. The Co NPs/MXene exhibited excellent
catalytic performance for the hydrolysis of ammonia borane with TOF value of 39.9 molH2
mol−1
cat min−1 at 323 K. The enhanced catalytic property was mainly due to the ultrafine nanoparticles formed on MXene surface. More importantly,
the catalytic activity for hydrolysis of ammonia borane did not significantly decrease for up to 6 recycling tests, indicating the remarkable reusability of Co NPs/MXene. Furthermore, this study opens up a new strategy for the preparation of non-noble metallic nanocatalysts with high performance
for hydrolysis reactions in practical hydrogen storage systems, thereby fast-tracking the application of ammonia borane in fuel cells.
研究领域:
材料科学
·
氢能存储
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 48
·10083-10096
·
IF 7.571
Hai Zhu,Xuequan Zhang,Qiusheng Wang,Jin Deng,Zhuangzhuang Zhang,Xiaoxian Zhang,Jun Cao,Bin He
The combined use of photothermal therapy (PTT) and photodynamic therapy (PDT) could circumvent the drawbacks of each individual therapeutic strategy, resulting in an enhanced antitumor effect. However, the lack of highly effective photo-agents that are irradiation-safe in the biologically transparent window hinder the advancement of phototherapy clinically. Hence, in this study, a charge separation engineering strategy was adopted to fabricate a nanoplatform with heterojunctions, namely, in situ TiO2-loaded MXene (Ti3C2/TiO2 heterojunctions). This nanoplatform exhibited reduced bandgap (1.68 eV), enhanced NIR-II photothermal conversion efficiency (44.98%), and extended absorption edge compared to pristine TiO2 for enhanced photodynamic effect. More importantly, the proliferation of tumor cells could be efficiently inhibited at a 5 mm chicken breast depth after 1064 nm laser irradiation, and the intracellular ROS production significantly increased under 660 nm or even 1064 nm laser irradiation with heterojunctions (HJs) compared with that of TiO2. Moreover, the in vivo data further confirmed that the as-prepared heterojunctions could efficiently eradicate tumors efficiently via improved photothermal effect with NIR-II laser irradiation and upregulated ROS production. Collectively, the reported HJs strategy provides an opportunity for the success of combinational PTT and PDT therapy in tumor treatment.
研究领域:
材料科学
·
生物医学工程
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 21
·2300747
·
IF 13.3
Zhuo Zhang,Zhiyuan Wang,Fangcheng Wang,Tingting Qin,Haojie Zhu,Peng Liu,Guangyao Zhao,Xiaoshu Wang,Feiyu Kang,Lei Wang,Cheng Yang
Micro-supercapacitors (MSCs) are an important energy storage component for future miniaturized electronic systems, yet their key performance indexes such as high-frequency response, energy density, and cycle life still have a large room to be improved. Herein, a laser-processed carbon-titanium carbide heterostructure (LCTH) electrode is demonstrated, which can excellently address the above key challenges by employing a unique one-step laser-processing fabrication method. Different from the other reported electrode structures, this LCTH electrode shows a heterogeneous structure, featuring the carbon nanofoam layer which provides extremely short ion transport channels and abundant electrochemical active sites, and the underlying titanium carbide layer which can provide excellent electron conductivity and contribute to the pseudo-capacitance. The assembled symmetric supercapacitor can stably work at the voltage window of 3.5 V at an ultra-high frequency of approximately 1121.3 Hz, exhibiting an ultra-high areal specific energy density of 721 µFV 2 cm −2 at 120 Hz and a cycle life of 140 000 cycles with capacitance retention of 100.95%, which is superior to most reported MSCs. The as-fabricated MSC is compatible with the contemporary embedded electronic component fabrication processes, which shows significant advantages in large-scale fabrication and system integration, demonstrating a broad prospect for future system-in-package applications.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 5
·1205-1211
·
IF 5.958
Miao Zhang,Xifan Chen,Jinyi Sui,Bahreselam Sielu Abraha,Yang Li,Wenchao Peng,GuoLiang Zhang,Fengbao Zhang,Xiaobin Fan
MXenes are a family of two-dimensional (2D) transition metal carbides, nitrides and carbonitrides that are supposed to be promising materials for high pseudocapacitive energy storage. It has been proven that Ti3C2Tx (Tx refers to –F, O, –Cl and –OH) MXenes with more O-termination could exhibit better performance in pseudocapacitors. However, direct oxidation modification would result in the serious oxidation of Ti3C2Tx into titanium dioxide. Here we report the controllable oxidation of Ti3C2Tx by readily adjusting the loading of ammonium persulfate, in order to turn the –F terminal groups to –O terminal groups on the Ti3C2Tx MXene. The partially oxidized Ti3C2Tx achieved a high capacitance of 303 F g−1 at 2 mV s−1, and 96.6% capacity can remain even after 9000 cycles. Hence, the controllable oxidation modification of Ti3C2Tx could be a promising strategy for surface modification of MXenes.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2019
·
IF 13.903
Fangfang Zhao,Weihong Liu,Tianlun Qiu,Wen-Bin Gong,Wei Ma,Qingwen Li,Feng Li,Fengxia Geng
With the rapid development of portable devices and wireless protocols, miniaturized energy storage units have become an important prerequisite. Although in-plane microsupercapacitors are emerging as competitive candidate devices, their practical applications have been severely hindered by their low energy density. Here, employing pseudocapacitive active materials working in complementary voltage windows, namely, manganese oxide (MnO2) and titanium carbide (Ti3C2), both in the two-dimensional sheet morphology, a flexible asymmetric interdigitated solid-state microsupercapacitor was assembled. Profiting from the perfect voltage complementarity of the two types of sheets, the high exposure of electrochemically active sites and the maximized utilization of the sheets due to the planar ion transport, the designed device achieved excellent electrochemical performance even when using a gel electrolyte. In particular, the device obtained a high specific capacitance of 106 F g–1 (295 mF cm–2), a wide potential window (2 V), an ultrahigh rate performance (retaining 83% even with a 20-fold in current density to 20 A g–1), an excellent cycling stability (87% retention after 104 cycles at 10 A g–1), and a competitive energy density of 58 W h kg–1 (162 μW h cm–2) that are even comparable to those of some microbatteries, while maintaining a high power density of 985 W kg–1 (2.7 mW cm–2). Importantly, this outstanding electrochemical performance was also stably maintained under various bending conditions. These results indicate that two-dimensional pseudocapacitive sheet materials have a plethora of possibilities for constructing flexible and wearable devices.
研究领域:
材料科学
·
能源存储技术
✓ 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）