ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Di Yang,Jinsheng Li,Changpeng Liu,Junjie Ge,Wei Xing,Jianbing Zhu
Rechargeable aqueous Zn–air batteries have been regarded as one of the most promising systems for flexible energy storage devices due to their high specific energy, safety, and cost effectiveness. However, Zn metal anodes exposed to strong alkaline electrolytes suffer from several issues such as corrosion, dissolution, and passivation, resulting in extremely poor cycle reversibility. Motivated by this challenge, we herein strategically design an MXene/Zn metal anode interfacial structure with single/few-layer Ti3C2Tx MXene as a protective layer. Such a design not only isolates the direct contact between Zn metal anodes and electrolytes but also inhibits zincate dissolution due to the ion screening function of Ti3C2Tx, potentially addressing the stubborn issues that Zn anodes faced with. As a result, the Ti3C2Tx-protected Zn metal anode exhibits superior cycle stability (stable for more than 400 cycles) to the bare Zn counterpart (20 cycles) at a high current density of 5.0 mA cm–2. When integrated into Zn–air coin cells, it has a high depth of discharge of 91% and operates stably for 140 cycles with small resistance. More interestingly, the excellent flexibility of the as-designed Ti3C2Tx-protected Zn metal anode endows the quasi-solid-state batteries with admirable voltage stability at different bending angles from 0 to 180°.
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 39
·14560-14568
·
IF 8.067
Qingtao Li,Wenke Yang,Kang Sun,Yan Guo,Hu Liu,Chuntai Liu,Changyu Shen
Flexible wearable electromagnetic interference (EMI) shielding materials have attracted great attention with the development of portable electronic devices, and paper based EMI shielding materials turn to be ideal candidates due to their flexibility, biodegradability and low cost. In this study, conductive MXene nanosheet decorated paper was developed through a simple dip-coating technique, where the MXene nanosheets can be strongly adhered onto the surface of cellulose fiber to construct an effective conductive network. Meanwhile, a low surface energy and micro–nano-structured 1H,1H,2H,2H-perfluorodecanethiol (PFDT)/carbon black (CB) layer was further introduced onto the surface to construct a superhydrophobic surface, avoiding the hygroexpansion of paper in water or moisture environments effectively. As a result, the prepared PFDT/CB/MXene@Paper exhibits reflection dominant EMI shielding performance, and a specific SE value of up to 3339.6 dB cm−2 g−1 was achieved. Importantly, the EMI shielding performance can be well maintained towards cyclic bending and in various acid, alkali, salt, and UV environments, which enhance the applicability of paper based functional materials significantly. Finally, its high conductivity also endows it with good Joule heating performance, improving the wearing comfort when used as a wearable EMI shielding material. This study will undoubtedly provide a high-efficiency design strategy for fabricating high-performance paper based EMI shielding materials.
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DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 1
·1-11
·
IF 6.048
Wang Xiaoying,Zhang Haiguang,Wang Xu,Chen Shuo,Yu Hongtao,Quan Xie
Reduced graphene oxide (RGO) membranes are theoretically more conducive to the rapid transport of water molecules in their channels compared with graphene oxide (GO) membranes, as they have fewer oxygen-containing functional groups and more non-oxidized regions. However, the weak hydrophilicity of RGO membranes inhibits water entry into their channels, resulting in their low water permeability. In this work, we constructed wettable RGO-MXene channels by intercalating hydrophilic MXene nanosheets into the RGO membrane for improving the water permeance. The RGO-MXene composite membrane exhibits high pure water permeance of 62.1 L/(m 2 ·h·bar), approximately 16.8 times that of the RGO membrane (3.7 L/(m 2 ·h·bar)). Wettability test results and molecular dynamics simulations suggest that the improved water permeance results from the enhanced wettability of RGO-MXene membrane and increased rate of water molecules entering the RGO-MXene channels. Benefiting from good conductivity, the RGO-MXene membrane with electro-assistance exhibits significantly increased rejection rates for negatively charged dyes (from 56.0% at 0 V to 91.4% at 2.0 V for Orange G) without decreasing the permeate flux, which could be attributed to enhanced electrostatic repulsion under electro-assistance.
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DOI
高影响因子
Applied Materials Today
·
2019
·
IF 8.013
Quan Xu,Wenjing Yang,Yangyang Wen,Shengkun Liu,Zheng Liu,Wee-Jun Ong,Neng Li
Multiple-color emissive MXene quantum dots (MQDs) exhibit vast application prospects in various fields, including optoelectronics, bioimaging, and catalysis. However, the majority of the recent MQDs display limited maximum emission in the blue-light region. Herein, we employ the hydrogen bonds as an adjustment method to prepare novel full-color MQDs using Ti 3 C 2 MXene as the starting material. By doping with sodium thiosulfate and ammonia water (sulfur-doped, nitrogen-doped), the maximum emission of the obtained MQDs demonstrates entire light spectrum covering from blue to orange light. Interestingly, the as-synthesized Ti 3 C 2 MQDs aqueous solutions unveil multiple-color, excitation-independent emission wavelength and fluorescence (lifetime and quantum yield) enhancement compared with in the dry state. The fluorescence shift and enhancement are confirmed by comprehensive spectroscopic techniques (e.g. grazing incidence X-ray diffraction (GIXRD)) and complementary density functional theory (DFT) calculations. The results indicate that the construction of stalwart bridge-like hydrogen-bonded networks between the MQDs by highly ordered bound water on the doped MQDs surface can give rise to the immobilization of the C O and C–O bonds of the MQDs, thus strengthening the rigidity of the entire system. As a benefit of the bandgap emission, white light-emitting diodes (WLEDs) with stable emission color by directly utilizing MQDs as an active emission layer have been realized for the first time. As such, the as-prepared full-color MQDs developed herein can remarkably broaden the prospect of MXene 2D quantum dots (2D-QDs) in a myriad of technological applications such as electronics, batteries, bioimaging, and cancer therapy.
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DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 14
·4953-4961
·
IF 6.119
Junyue Li,Ziyi Wang,Huayu Chen,Qiqi Zhang,Huilin Hu,Lequan Liu,Jinhua Ye,Defa Wang
Photocatalytic reduction of carbon dioxide (CO2) into hydrocarbon fuels has attracted increasing research attention in recent years. However, the fast recombination of photoinduced charge carriers and poor adsorption/activation capability of CO2 molecules limit the photoconversion efficiency. Herein, we report on loading a two-dimensional (2D) titanium carbide (Ti3C2) MXene as a noble-metal-free cocatalyst onto zinc oxide (ZnO) via a facile electrostatic self-assembly method for efficient CO2 photoreduction. It is interesting to find that the ZnO loaded with 7.5 wt% of surface-alkalinized Ti3C2 exhibited remarkably improved evolution rates of CO (30.30 μmol g−1 h−1) and CH4 (20.33 μmol g−1 h−1), which were approximately 7-fold and 35-fold those of bare ZnO, respectively. The surface-alkalinized Ti3C2 MXene is believed to play a crucial role in improving the separation/transfer of photoinduced charge carriers and the adsorption/activation of CO2 molecules, accounting for the superior photocatalytic activity of CO2 reduction. Our work demonstrates that the Ti3C2 MXene could be employed as a noble-metal-free cocatalyst for efficient photocatalytic CO2 reduction.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Wei Wang,Huimeng Feng,Jianguo Liu,Mutian Zhang,Shuan Liu,Chao Feng,Shougang Chen
Ti 3 C 2 T x (MXene) as a two-dimensional material has attracted numerous attentions in photocatalysis and antibacterial, and the effectiveness of MXene for photocatalysis triggered antibacterial is in urgent need of development. Herein, we synthesized a novel cuprous oxide (Cu 2 O) anchored MXene nanosheet. Cu 2 O nanospheres can be uniformly anchored on the surface of MXene firmly due to the electrostatic effect between single-layer MXene and Cu 2 O nanospheres. In comparison with MXene, Cu 2 O and mixture (MXene and Cu 2 O), Cu 2 O/MXene nanosheet exhibits an excellent antibacterial activity against S. aureus and P. aeruginosa , whose bacteriostasis efficiencies sharply increased to 97.04% and 95.59%, respectively. Photoluminescence spectroscopy reveals that the incorporation of MXene and Cu 2 O can effectively prevent the recombination of electron-hole pairs of Cu 2 O and present a high photocatalytic disinfection. Single-layer MXene with large surface area accepts electrons from Cu 2 O, leading to abundant electrons on the surface of MXene, which provide better charge transfer between bacteria and Cu 2 O/MXene nanosheets. In addition, density functional theory calculations were used to investigate an optimized band structure of Cu 2 O-MXene as well as its strong electronic interactions, which are essential for photocatalysis and ROS generation. Finite element method further revealed that MXene promoted an enhancement of surface plasmon resonance to generate ROS on the surface of Cu 2 O/MXene. Furthermore, Cu 2 O/MXene shows a synergistic antibacterial effect of MXene accelerating photoelectron transportation, Cu 2 O antimicrobial and photocatalysis, elevated ROS production ability, and surface plasmon resonance action on the surface of Cu 2 O/MXene.
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DOI
高影响因子
SusMat
·
2022
·Vol. 2
·期 3
·379-390
·
IF 0
Xiang Chu,Yihan Wang,Lucheng Cai,Haichao Huang,Zhong Xu,Yanting Xie,Cheng Yan,Qing Wang,Haitao Zhang,Hong Li,Weiqing Yang
The wide-spread proliferation of aqueous MXene-based supercapacitor has been largely shadowed by the limited cell potential window (typically in the range of 0–0.6 V). To address this baffling issue, designing asymmetric supercapacitor (ASC) is proposed as a rational strategy to enlarge the potential window (thus energy density) of individual cell in aqueous electrolytes. To this date, however, it still remains a great challenge to develop easy fabricating, 3D nanostructured, and pseudocapacitive cathode materials that can perfectly match with MXene anode materials. In this work, we propose a supramolecular strategy to construct conducting polymer hydrogel (CPH) with highly interconnected 3D nanostructures and large pseudocapacitance, which can finely match with 2D Ti 3 C 2 T x . The as-assembled CPH//Ti 3 C 2 T x ASC with CPH cathode and MXene anode can operate in a broadened potential window of 1.15 V in aqueous PVA/H 2 SO 4 gel electrolyte with remarkably improved energy density of 16.6 μWh/cm 2 (nine times higher than that of symmetric MXene supercapacitor). Additionally, this ASC exhibits outstanding cyclic stability with no trackable performance decay over 30,000 galvanostatic charge and discharge cycles. It is demonstrated in this work that employing positive CPH electrode is a feasible yet promising strategy to enhance the potential window and energy density of aqueous MXene supercapacitors.
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DOI
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wenlong Luo,Qianwen Liu,Baozhong Zhang,Jie Li,Ruidong Li,Tingxi Li,Zhiqiang Sun,Yong Ma
MXene nanosheets are susceptible to self-accumulation during operation, which significantly hampers their application. However, this issue can be effectively addressed through the introduction of intercalation materials. In this study, an MXene/reduced graphene oxide (rGO)/carbon nanotubes (CNTs) (MGC) film is prepared using vacuum-assisted filtration. CNTs and rGO nanosheets, as intercalation materials, play a crucial role in forming a stable interlayer structure with MXene nanosheets, resulting in an expansion of the MXene layer spacing and the creation of multi-directional stable ion transport channels. Consequently, a larger number of ion-accessible active sites are exposed. The prepared MGC film exhibits an impressive specific capacitance of 463.5F g −1 at a current density of 1 A g −1 . Furthermore, it is noteworthy that the asymmetric supercapacitor (ASC) assembled with the MGC film as the negative electrode and MnO 2 as the positive electrode demonstrates a large voltage window of 1.7 V, a high energy density of 33.95 Wh kg −1 at a power density of 814.8 W kg −1 , and an outstanding capacitance retention rate of 92.9% after 8000 cycles at 3 A g −1 . The optimization strategy for MGC electrodes not only showcases the feasibility of MXene development but also provides crucial technical support for the application of MXene in the emerging generation of portable and flexible wearable energy storage devices.
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DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Yuxin Liu,Yi Yang,Bowen Deng,Lei Jing,Bo Yin,Mingbo Yang
Titanium carbide (Ti 3 C 2 ), with the features of metallic conductivity and two-dimension (2D) structure, is considered as a promising material using in supercapacitors . In this work, a kind of Ti 3 C 2 -based nanocomposite with vertically-aligned polyaniline (PANI) nanoarrays was prepared by simple in-situ polymerization, where Ti 3 C 2 served as a conductive substrate supporting the growth of PANI. Vertically aligned PANI nano-array may increase the surface area, provide considerable pseudocapacitance , and prevent the aggregation of Ti 3 C 2 nanosheets . Owing to its hierarchical structure, the composite electrode gained significant advantage in increasing electrochemical active sites and accelerating electrolyte ions diffusion. The energy storage devices with high electrochemical performance and simple preparation methods has attracted much attention reached 536 F g −1 at the current density of 0.1 A g −1 , and the composite had a good capacitance retention and cycle stability (86.2 % after 5000 cycles) at a high current density of 10 A g −1 . In addition, the symmetric supercapacitor was assembled and displayed a high energy density (933.9 W kg −1 ) at the power density of 26.9 Wh kg −1 . After 5000 charge-discharge cycles, the capacitance retention rate is 70.4 %. The experimental results indicated that the improved electrochemical performance of supercapacitor was closely related to the introduction of Ti 3 C 2 and construction of the hierarchical structure. Furthermore, the preparation strategy of Ti 3 C 2 -PANI composite can be used to further produce other composites with similar regular structure and unique electrochemical performance.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wei Zheng,Zequn Yang,Jiefeng Chen,Mingguang Zhang,Hongxiao Zu,Ruiyang Qin,Wenqi Qu,Jianping Yang,Lijian Leng,Hailong Li
Utilization of monolithic mineral sulfide-based sorbent for the fix-bed elemental mercury (Hg 0 ) removal is regarded as a predominant predicament in the field of Hg 0 abatement. In this work, a general and facile route was exploited to establish CuS particles decorated 3D porous Ti 3 C 2 T x MXene aerogel via divalent Cu 2+ cations induced assembly combined with subsequent high-temperature sulfurization treatment, during which, uniform CuS particles were homogeneously anchored throughout the Ti 3 C 2 T x substrate. The obtained 3D CuS/Ti 3 C 2 T x MXene aerogel exhibited satisfactory textural property, hierarchical pore structure and strong interaction between Ti 3 C 2 T x MXene and CuS. Meanwhile, the inherent restacking of Ti 3 C 2 T x MXene nanosheet and serious agglomeration of CuS can also be effectively avoided in the formation of aerogel. Those structural advantages originating from this novel gelation process favorably contributes to satisfactory Hg 0 mass transfer and sufficient utilization of CuS active ligands, which largely strengthens Hg 0 removal performance and broadens the fix-bed application of mineral sulfides. Consequently, the Hg 0 capture capacity and adsorption rate of CuS/Ti 3 C 2 T x MXene aerogel reached 90596.4 g m −3 and 120.64 g m −3 min −1 , respectively, far outbalancing those of the reported in-situ selenized copper foam with excellent Hg 0 removal activity. The impressive Hg 0 sequestration performance is attributed to its relatively large specific surface area, layered pore channel, and highly dispersed CuS particles, largely boosting Hg 0 mass transfer and following sequestration. Moreover, other mineral sulfides/Ti 3 C 2 T x MXene aerogels can also be constructed by just replacing divalent metal cations, which makes the initial effort towards the fix-bed utilization of mineral sulfides-based aerogel for vapor-phase Hg 0 immobilization.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuhan Cui,Jing Sun,Yining Wang,Lijie Zhao,Jiawei Wang,Yue Song,Ruixiang Xu,Zhongmin Su
Reasona ble structural frame modification and further optimization design of traditional substrates are favorable schemes to break through the current insufficient energy density of electrode materials for supercapacitors. Transition metal chalcogenides are being investigated as electrode materials for supercapacitors due to their exceptional energy storage capacity. However, single transition metal selenides, transition metal sulfides, or traditional transition metal selenides all have the problems of insufficient conductivity and structural collapse caused by charging and discharging, which limit their path to marketization. In this work, an isomorphic cobalt‑manganese‑selenium sulfide supported by MXene quantum dots (MQDs) based on ZIF was developed using a two-step hydrothermal method to address the energy storage disadvantages of chalcogenides. Thanks to the unique isomorphic skeleton design (enhancing the synergistic effect of selenium and sulfur) and the advantages of MQDs (short-range ion diffusion path) wrapped inside and outside selenium sulfide, MQDS@Mn 0.6 Co 0.4 Se/Mn 0.77 Co 0.23 S composite as supercapacitor electrode broke through the voltage window (0.5 V) of transition metals in alkaline environment, and its charge-discharge window was as high as 0.55 V when the specific capacitance was 1 A g −1 . The assembled asymmetric supercapacitor (ASC) can operate within a large voltage window of 1.6 V. When the power density reaches 817.52 W kg −1 , the energy density is as high as 83.91 Wh kg −1 . At 1.6 V (0.1 V above traditional), capacitance retention drops by only 13.09 % over 10,000 cycles. This study proposes a novel approach to the rational design of transition metal chalcogenides and the transformation of MXene substrates, resulting in electrode materials with prolonged charge-discharge times and a wide voltage window. This discovery provides a new avenue for developing advanced supercapacitor electrodes.
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Yuan Xiang,Jie Li,Jianhua Liu,Junwen Zhou,Shenghui Guo,Jiabin Zeng
NiCoMn-LDH/polyaniline (PANI)/MXene composite materials are prepared via a hydrothermal method. PANI is loaded onto MXene, and NiCoMn-LDH is grown in situ on PANI/MXene. The inherent positive charge in NiCoMn LDH effectively counteracts the self-aggregation tendency of MXene nanosheets and promotes the uniform in-situ growth of NiCoMn lactate dehydrogenase on the surface of PANI loaded MXene. Thus, the composite of NiCoMn-LDH/PANI/MXene boasts exceptional interfacial compatibility and an extensive contact area, facilitating seamless electron and ion transport across redox active centers. The NiCoMn-LDH/MXene/PANI electrode demonstrates remarkable performance, achieving the highest specific capacitance of 416.3 F g −1 at 0.2 A g −1 . Furthermore, it exhibits unparalleled cycling stability, maintaining its capacitance without any decay even after 10,000 cycles at 6 A g −1 . In addition, the assembled CNMP-MX-2//AC boasts a substantial specific capacity of 553.1 F g −1 at 0.2 A g −1 , accompanied by power density of 145.1 Wh·kg −1 and an energy density of 161.5 W kg −1 , showcasing its exceptional performance capabilities. The capacitance does not decay after 10000 cycles. The excellent electrochemical performance indicates that the NiCoMn LDH/MXene/PANI composites used directly as an electrode serves as an effective strategy for enhancing energy storage.
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产品关联
DOI
高影响因子
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