INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Zhongxuan Lin,Zhenluo Yuan,Huanhuan Zhang,Shuyan Guan,Xiaojiao Wang,Shiqian Zhao,Guangxin Fan,Yanping Fan,Baozhong Liu
Lowering the dehydrogenation temperature and maintaining high dehydrogenation capacity are greatly hindering the practical application of α-AlH 3 for the hydrogen fuel cell industry. Herein, the layered accordion-like V 2 C MXene is synthesized and doped into α-AlH 3 by mild ball milling . The 1 wt.% V 2 C-catalyzed α-AlH 3 possesses excellent dehydrogenation performance with a low initial decomposition temperature of 70.5 °C and a high hydrogen release capacity of 8.1 wt.%. Furthermore, 7.8 wt.% of hydrogen could be quickly released from α-AlH 3 -1 wt.% V 2 C composite within 15 min at 120 °C, with a lower activation energy of 69.5 kJ/mol than that of as-received sample. The excellent dehydrogenation performance is attributed to the high activity of the zero valence V catalyst which is transformed from the multivalent V during ball milling and to promote dissociation and reorganization of hydrogen. This effective approach significantly enhances the dehydrogenation of α-AlH 3 , providing a hopeful approach for modifying metal hydrides .
研究领域:
材料科学
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无机化学
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能源化学
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纳米材料
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储氢材料
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Materials
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2018
·Vol. 11
·期 11
·2112
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IF 2.467
Meng Wu,Bingxin Wang,Qianku Hu,Libo Wang,Aiguo Zhou
The effect of etching solution on the synthesis process of two-dimensional vanadium carbide (V2C MXene) was researched. Three etching solutions were used to etch ternary carbide V2AlC at 90 °C. The three solutions were: lithium fluoride + hydrochloric acid (LiF + HCl), sodium fluoride + hydrochloric acid (LiF + HCl), and potassium fluoride + hydrochloric acid (KF + HCl). It was found that only NaF + HCl solution was effective for synthesizing highly pure V2C MXene. The existence of sodium (Na+) and chloridion (Cl−) in etching solution was essential for the synthesis. The thermal stability of the as-prepared V2C MXene in argon or air was studied. From thermogravimetry and differential thermal analysis, V2C MXene was found to be stable in argon atmosphere at a temperature of up to 375 °C. As the temperature increased, V2C MXene was gradually oxidized to form nanoparticles composed of vanadium trioxide (V2O3) and a part of V2C MXene was broken and transformed to vanadium carbide (V8C7) at 1000 °C. In air atmosphere, V2C MXene was stable at 150 °C. At 1000 °C, V2C MXene was oxidized to form vanadium pentoxide (V2O5).Keywords:MXene;V2C;synthesis;thermal stability
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Ruizheng Xu,Guiyu Wei,Zhemin Xie,Sijie Diao,Jianfeng Wen,Tao Tang,Li Jiang,Ming Li,Guanghui Hu
Increasing the efficiency of charge transfer and separation efficiency of photogenerated carriers are still the main challenges in the field of semiconductor-based photocatalysts. Herein, we synthesized g-C 3 N 4 @V 2 C MXene photocatalyst by modifying g-C 3 N 4 using V 2 C MXene. The prepared photocatalyst exhibited outstanding photocatalytic performance under visible light. The degradation efficiency of methyl orange by g-C 3 N 4 @V 2 C MXene photocatalyst was as high as 94.5%, which is 1.56 times higher than that by g-C 3 N 4 . This was attributed to the V 2 C MXene inhibiting the rapid recombination of photogenerated carriers and facilitating rapid transfer of photogenerated electrons (e − ) from g-C 3 N 4 to MXene. Moreover, g-C 3 N 4 @V 2 C MXene photocatalyst showed good cycling stability. The photocatalytic performance was higher than 85% after three cycles. Experiments to capture free radicals revealed that superoxide radicals (·O 2 − ) are the main contributors to the photocatalytic activity. Thus, the proposed g-C 3 N 4 @V 2 C MXene photocatalyst is a promising visible-light catalyst.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Yafeng Chen,Heliang Yao,Fantao Kong,Han Tian,Ge Meng,Shuize Wang,Xinping Mao,Xiangzhi Cui,Xinmei Hou,Jianlin Shi
Oxygen evolution reaction (OER) is a pivotal electrochemical reaction process for many renewable energy technologies. Due to the sluggish OER kinetics, searching for efficient low-cost non-precious metal catalysts is one of the crucial but very challenging steps. Herein, V 2 C MXene synergistically coupled with hypophosphite-intercalated FeNi (oxy)hydroxide (H 2 PO 2 − /FeNi-LDH-V 2 C) electrocatalyst is synthesized. The H 2 PO 2 − /FeNi-LDH-V 2 C exhibits excellent OER performance with an overpotential of 250 mV (η 10 ) and small Tafel slope of 46.5 mV dec −1 in 1.0 M KOH electrolyte, and excellent rechargeable Zn-air battery performance with superior open circuit potential (1.42 eV), power density (137 mW cm −2 ) and well durability. The strong interaction and electronic coupling with prominent charge-transfer between FeNi-LDHs and V 2 C MXene endow the composite significant OER performance and structural stability, and the adsorption/desorption balance for the OER reaction pathway, eventually promoting the intrinsic activity. This work demonstrates the great promise of MXene-based nanohybrids as advanced electrocatalysts for renewable energy applications.
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Energetic Materials Frontiers
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2022
·Vol. 3
·期 4
·199-208
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IF 0
Bo Yang,Peng-fei Tang,Rui Li,Xiao-dong Li,Guang-cheng Yang
Reactive combustion catalysts (RCCs) are emerging materials for the combustion control of ammonium perchlorate (AP)-based propellants owing to their unique ability to control burning rates, high atomic utilization, and high-energy output. This paper reported that the combustion of AP-based propellants can be greatly enhanced by applying vanadium carbide (V 2 C) MXene as RCCs because of its combined advantages of unique reactivity and high chemical energy storage. The decomposition of AP in the presence of V 2 C MXene involves both direct reaction decomposition and catalytic decomposition. V 2 C MXene preferentially reacts with AP as fuel, releasing its chemical energy in the form of heat and forming VO x /C nanosheets. The VO x /C nanosheets formed in situ can serve as catalysts to promote thermal decomposition of the remaining AP. Unlike other combustion catalysts, the direct redox reaction between V 2 C MXene and AP dominates the decomposition of AP. Compared with other RCCs that mainly work through catalytic decomposition, V 2 C MXene exhibits a greatly increased burning rate, a shorter to-steady-state-combustion time, and greater energy release.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Qihuang Deng,Yuehao Huang,Binghe Chen,Maolin Bo,Yefeng Feng
Strontium titanate (STO) is a ferroelectric ceramic that shows paraelectric behaviour at room temperature , leading to a low dielectric constant in polymer composites with STO particles for energy storage applications. In this study, to improve the dielectric constant of polymer/STO composites, STO filler was modified via its hybridisation with conductive V 2 C MXene to form high-polarity interphase. The high-polarity mechanism of the V 2 C/STO interphase was analysed using density functional theory (DFT) calculations. An interesting connection between V 2 C and STO through an interfacial single oxygen atom was observed. Polymer composites containing hybrid filler exhibited balanced electrical properties, including a high dielectric constant, low tanδ, and high breakdown strength . The novelty of this study lies in the strategy of improving the dielectric response of a paraelectric ceramic filler through heterojunction modification. Consequently, the composite with 9 wt% hybrid filler exhibited a high dielectric constant of ~87 and low tanδ of ~0.038 at 100 Hz along with a reasonably high breakdown strength of ~233 MV/m. It is expected that this study will contribute to the effective design of high-polarity hybrid ceramic fillers for advanced composite dielectric applications.
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ELECTROCHEMISTRY COMMUNICATIONS
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2018
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IF 4.66
Qingmin Shan,Xinpeng Mu,Mohamed Alhabeb,Christopher E. Shuck,Di Pang,Xin Zhao,Xue-Feng Chu,Yingjin Wei,Fei Du,Gang Chen,Yury Gogotsi,Yu Gao,Yohan Dall'Agnese
Recently, a large family of 2D materials called MXenes have attracted much attention in the field of supercapacitors , thanks to the excellent performance demonstrated by Ti 3 C 2 MXene-based electrodes. However, research on MXenes for supercapacitor applications has been primarily focused on Ti 3 C 2 , even though there are more than 20 other members of this large family of materials already available. Studies on other MXenes are emerging, with promising results already achieved by Ti 2 C, Mo 2 C, and Mo 1.33 C in aqueous electrolytes. Yet, many other MXenes remain unexplored in aqueous supercapacitor applications. In this work, we report on the electrochemical behavior of a vanadium carbide MXene , V 2 C, in three aqueous electrolytes. Excellent specific capacitances were achieved, specifically 487 F/g in 1 M H 2 SO 4 , 225 F/g in 1 M MgSO 4 , and 184 F/g in 1 M KOH, which are higher than previously reported values for few micrometer-thick delaminated MXene electrodes. This work shows the promise of V 2 C MXene for energy storage using aqueous electrolytes.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Tariq Bashir,Xiangyi Li,Shiqi Yang,Yuheng Song,Shaowen Zhou,Jiaqi Wang,Wenhao Zhu,Jie Yang,Jianqing Zhao,Lijun Gao
High-energy lithium-ion batteries (LIBs) have been actively pursued for practical applications in advanced electric vehicles and large-scale energy storage systems. The silicon (Si) material has been considered as a promising anode candidate due to its impressive lithium storage capacity, but is facing the challenge to ameliorate its cycling and rate performance. We here report a structure integration strategy to overcome major issues of poor capacity retention and slow kinetics during the lithium storage of Si anode, through in situ embedding Si nanoparticles into V 2 C MXene nanosheets . The MXene-supported Si@V 2 C nanocomposite anode reveals significantly enhanced cycling stability and improved lithium storage kinetics compared to that of the pristine Si anode. A high capacity exceeding to 430 mAh g −1 can be retained for 150 cycles at 200 mA g −1 current density. In addition, the conductive MXene supporter has been demonstrated to facilitate lithiation/delithiation processes for the Si by enhancing the charge transfer kinetics, as it is demonstrated by in situ electrochemical impedance spectroscopic (EIS) and Galvanostatic Intermittent Titration Technique (GITT) measurements. Findings from this work may inspire feasible structural designs for the practical deployment of MXene composited Si anode materials for next-generation lithium-ion batteries.
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Advanced Healthcare Materials
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2026
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IF 11
He-Ping Zuo,Jia Yang,Wei Zhao,Min Yang
Sepsis-associated intestinal injury represents a critical pathological event contributing to multiple organ dysfunction, with its pathogenesis closely linked to excessive oxidative stress and hyperactivated endoplasmic reticulum stress. Current clinical interventions lack the capacity for precise modulation of the intestinal microenvironment, while existing nanozyme systems generally face challenges such as low oral delivery efficiency, insufficient stability, and uncertain biosafety. To address these limitations, we developed a novel oral nanozyme delivery system based on 2D V 2 C MXene. Through surface modification with hydroxyethyl cellulose (HEC), we constructed a V 2 C@HEC (CV) nanozyme with enhanced physiological stability and intestinal mucoadhesion. In both in vitro and in vivo studies, the CV nanozyme demonstrated significant reactive oxygen species (ROS)-scavenging capacity. Oral administration of CV effectively mitigated intestinal barrier damage and improved survival in a septic mouse model. Mechanistic investigations suggested that the protective effects of CV may be associated with ROS clearance and modulation of endoplasmic reticulum stress, with inhibition of the ATF6/CHOP signaling pathway potentially serving as one underlying mechanism for its cytoprotective function. In summary, this study not only presents a novel nanozyme material with favorable biocompatibility, excellent stability, and a defined antioxidant mechanism, but also provides an innovative materials-based strategy for the treatment of sepsis.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Yafeng Chen,Ge Meng,Tao Yang,Chang Chen,Ziwei Chang,Fantao Kong,Han Tian,Xiangzhi Cui,Xinmei Hou,Jianlin Shi
Earth-abundant MoS 2 has attracted great attentions as a promising hydrogen evolution reaction (HER) electrocatalyst , but it is limited by sluggish water dissociation and strong adsorption of the oxygen-containing intermediates in alkaline media. Herein, an interfacial engineering strategy to fabricate Co-doped 1T-MoS 2 coupling with V 2 C MXene was reported to improve the HER kinetics of MoS 2 . DFT calculations predict that the construction of heterogeneous interfaces between V 2 C MXene and Co-doped 1T-MoS 2 can effectively reduce the energy barrier of water dissociation and optimize the free energy of hydrogen adsorption. As a result, the synthesized Co-MoS 2 /V 2 C@CC nanohybrid exhibits excellent HER performance with small overpotentials of 70.1, 263.2 and 296 mV to achieve current densities of 10, 500 and 1000 mA cm −2 , respectively, and outstanding stability for 50 h HER test without degradation. Additionally, the overall hydrazine-assisted water splitting (OHzS) system catalyzed by Co-MoS 2 /V 2 C@CC in both anode and cathode requires only 0.33 V to achieve a current density of 10 mA cm −2 with significant long-term durability.
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ACS Sensors
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2022
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IF 9.618
Meiling Lian,Yuqing Shi,Liuxing Chen,Yongji Qin,Wei Zhang,Jingbo Zhao,Da Chen
The inactive adsorption and interference of biomolecules in electrochemical biosensors is a topic of intense interest. Directly utilizing native cell membranes to endow electrochemical surfaces with antifouling and biocompatible features is a promising strategy, rather than attempting to synthetically replicate complex biological interface properties. In this study, we present a facial and sensitive sandwich-type antifouling immunoassay through platelet membrane/Au nanoparticle/delaminated V2C nanosheet (PM/AuNPs/d-V2C)-modified electrode as the substrate of sensing interface and methylene blue/aminated metal organic framework (MB@NH2-Fe-MOF-Zn) as an electrochemical signal probe. The biosensor perfectly integrates the high conductivity of AuNPs-loaded V2C MXene with the excellent loading property of NH2-Fe-MOF-Zn to improve the electrochemical sensing performance. In addition, the excellent antifouling properties of the homogeneous cell membrane can effectively prevent the non-specific adsorption of model proteins. The obtained antifouling biosensor possesses the capability of ultrasensitive detection of CD44 and CD44-positive cancer cell in complex liquids and exhibits good analytical performance for the analysis of CD44 with a linear range from 0.5 ng/mL to 500 ng/mL. This strategy of developing cell membrane-based biosensing systems with enhanced antifouling capability can be easily expanded to the construction of other complex biosensors, and the advanced biological probes and analytical methods provide a favorable means to accurately quantify biomarkers associated with tumor progression.
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JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Zicong Yang,Yanhui Chen,Yukun Chang,Xiangxian Song,Jinshu Wang,Hongyi Li
In order to enhance the conductivity and catalytic efficiency of non-noble electrocatalyst, an electrocatalysts consisting of ZnCo metallic double oxide with S doping embedded on V 2 C MXene for oxygen evolution reaction (OER) is synthesized. Cobalt serves as the primary active site, while zinc contributes to improve conductivity owing to its high electronegativity. Sulfur doping plays a crucial role in reducing the energy barrier of rate determining step of OER. The V 2 C MXene as a substrate can promote conductivity as well, resulting in synergistic effect. The electrocatalyst exhibits a low overpotential of 240 mV at 10 mA cm −2 in alkaline electrolyte, surpassing that of IrO 2 commercial electrocatalyst. The potential shows only a minimal ∼5 mV day after 72-h stability test at 20 mA cm −2 . The current density at 1.6 V vs RHE is 2 times that of commercial IrO 2 . Both theoretical calculation and experimental result demonstrate the advantage brought by the incorporation of zinc and sulfur. This work introduces a new idea of synergetic effect in non-noble metallic electrocatalysis.
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