ENERGY & FUELS
·
2021
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IF 3.605
Xianjie Liu,Fankai Lin,Xiaoguang Zhang,Mingyong Liu,Zhenhua Sun,Liangpei Zhang,Xin Min,Ruiyu Mi,Zhaohui Huang
The application of phase-change materials (PCMs) for solar energy utilization and thermal energy storage is limited by their low thermal conductivity, undesirable solar-thermal conversion efficiency, and poor shape stability. Here, the novel paraffin/Ti3C2Tx@gelatin (PA/T@G) composite PCMs were successfully obtained by encapsulating paraffin (PA) into gelatin aerogels modified by Ti3C2Tx nanosheets. Three-dimensional (3D) porous gelatin aerogel acted as a favorable supporting material for PA with large enthalpy, while the Ti3C2Tx nanosheets contributed to enhancing the thermal conductivity and converting solar energy into thermal energy by trapping photons and heating molecules. The results exhibited that the composite PCMs had high load rates (96.3–97.7%) and large melting enthalpies (184.7–199.9 J/g). The thermal conductivity of PA/T-30@G was 0.919 W/(m·K), which reached up to 3.48 times that of PA, and the solar-thermal conversion efficiency of the composite PCMs was greatly improved via the introduction of Ti3C2Tx nanosheets. Notably, the composite PCMs with good shape and thermal stability is a promising material for solar-thermal energy storage applications.
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POLYMER
·
2023
·
IF 4.6
Haowen Sun,Qiuru Bao,Gang Chen,Shulong Wu,Yuan Liu,Qi Wang
With the development of microelectronics and flexible wearable electronic devices, poly(vinyl alcohol) (PVA) based thermal interface materials (TIMs) have received much attention. However, poor heat dissipation and high flammability have emerged as the key issues that restrict their application. In this work, the directional alignment of phytic acid (PA) modified boron nitride nanosheets (BNNS) and Ti 3 C 2 T x MXene in PVA matrix was achieved by ice-templated assembly, which simultaneously enhanced the flame retardancy and thermal conductivity of PVA composite films (PVA/BT x ). Owing to the synergistic effect between oriented BNNS and Ti 3 C 2 T x MXene on forming the thermally conductive network within PVA matrix, the in-plane thermal conductivity of PVA/BT x -30 composite film was increased to 8.54 W m −1 K −1 , much higher than that of PVA film (0.30 W m −1 K −1 ). Meanwhile, the heat dissipation process of PVA films applied as TIMs was simulated, which showed that PVA/BT x -30 films exhibited excellent thermal conduction and significantly decreased the operation temperature of electronic devices. Additionally, the peak heat release rate (PHRR) and total heat release (THR) of PVA/BT x -30 films were reduced by 60.3% and 62.0%, respectively, showing good flame retardancy. Importantly, the flexible Ti 3 C 2 T x nanosheets further enhanced the mechanical properties of PVA/BT x composite films. Therefore, this work provides an effective method for the preparation of high thermal conductivity and flame retardant composite materials, which has important potential applications in the microelectronics industry.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Songyang Qian,Zeyu Yuan,Guangshe Li,Dongdong Li,Junzhi Li,Wei Han
The room temperature sodium-sulfur battery has attracted researchers' attention due to its ultra-high energy storage capacity and extremely low cost, but its poor cycling performance and severe dissolution of sodium polysulfide hinder its practical application. Here, we report a stable MXene derived composite sulfur host material based on nickel hydroxide coated with carbon nano network, to achieve the adsorption and conversion of sodium polysulfides. Due to the physical constraints provided by the closed layered structure and the synergistic effect of MXene adsorption and Ni(OH) 2 catalytic activity, the shuttling effect is effectively suppressed. The ex-situ analysis of electrode after reaction shows that the composite material has strong adsorption on polysulfides. In addition, Ni(OH) 2 can also accelerate the reaction process from sulfur to sodium sulfide. Therefore, Ti 3 C 2 T x /Ni(OH) 2 /C/S composite cathode can provide extraordinary reversible capacity 1175.3 mAh/g at 0.22C after 100 cycles and excellent long cycle stability (673.5 mAh/g at 2.2 C with a low decay rate of only 0.032% per cycle over 800 cycles).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
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IF 5.2
Yuncong Yang,Wenmin Song,Balaji Murugesan,Xiuwen Cheng,Mingming Jiang,Zhuo Chen,Beifa Yan,Yurong Cai
Flexible strain sensors have attracted the attention of researchers due to their wide range of applications in wearable electronic skin and healthcare monitoring. The fabrication of flexible strain sensors with high strength , good linear sensitivity, stability and comfort is still challenging. Here, an anisotropic silk fibroin (SF) based hydrogel is fabricated through an oriented freezing method and a low-temperature concentration is to follow. This approach combines HA with SF to increase the hydrogel's water-holding capacity, and Ti 3 C 2 T x MXene is doped as a conductive-sensitive component. Benefitting from the synergy of its well-designed components and the oriented internal crosslinking network structure, the hydrogel has a wide working range and a stable resistance response under 0∼80% compression strain. Especially the oriented hydrogel has ultra-high compression resilience (∼ 99%) in the orientation direction, and it is stable and durable for up to 10,000 cycles under 50% compression self-rebound. Flexible sensors made of conductive hydrogel were attached to the human body or combined with out-of-body clothing to detect human movement. Based on these findings, the prepared conductive hydrogel could be used as a wearable strain sensor material.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
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IF 18.5
Zhixin Jia,Jingbin Zhang,Zengtao Ji,Jiaran Zhang,Xinting Yang,Ce Shi,Xia Sun,Yemin Guo
Hydrogen sulfide (H 2 S) contamination of food has raised widespread public health concerns, leading to substantial medical and economic burdens. Herein, a 2D/0D heterojunction fluorescent probe (TCTG) with Schottky barriers (SB) is designed and synthesized, utilizing Ti 3 C 2 T x MXene-loaded graphene quantum dots (GQDs), for the detection of H 2 S during food spoilage. The microstructures observed through SEM and TEM reveal that uniformly sized GQDs are evenly attached to the surface of a monolayer Ti 3 C 2 T x . The chemisorption between GQDs and Ti 3 C 2 T x facilitates charge transfer and the formation of SB, resulting in intramolecular charge transfer (ICT) effects. With the introduction of H 2 S, TCTG (50%) exhibits the highest sensitivity, selectivity, and anti-interference properties, with ultra-fast fluorescence transient reaction (3s) and remarkably low detection limit of 41.82 ppb as well as noticeable color change. When TCTG (50%) reacted with H 2 S, the ICT effects are inhibited, leading to the recovery of photoinduced electron transfer (PET) and fluorescence quenching. Notably, probe TCTG is effectively utilized to detect changes in H 2 S levels in raw foods to assess their quality. Overall, the significance of this study is its potential to revolutionize food spoilage detection, offering a fast, reliable, and sensitive method to ensure food safety and reduce associated health and economic burdens.
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Analytical Methods
·
2024
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IF 2.7
Jing Li,Xun Zhou,Guanghua Mao,Gangbing Zhu,Yinhui Yi
In recent years, numerous colorimetric methods have been developed for the detection of silver ions (Ag+), yet there remains a need for a simple, sensitive, real-time and quantitative sensing platform. Herein, Ti3C2Tx MXene nanoribbons (Ti3C2TxNRs) were utilized as the carrier material, and gold@platinum (Au@Pt) bimetallic nanoparticles were decorated onto the Ti3C2TxNR surface, for the first time, via a facile self-reduction method. The resulting Au@Pt–Ti3C2TxNR nanohybrid exhibited excellent catalytic activity, facilitating the oxidation of 3,3′,5,5′-tetramethylbenzidine, a colorless substrate, to generate a blue product (oxTMB), displaying prominent peroxidase-like activity. In the presence of Ag+, a remarkable inhibiting effect was observed on the catalytic activity of the Au@Pt–Ti3C2TxNR nanohybrids, effectively halting the generation of oxTMB. Based on this, the as-obtained Au@Pt–Ti3C2TxNR nanozyme was then utilized to develop a novel colorimetric sensing platform for Ag+ detection, with a low detection limit of 1.57 nM and a wide linear detection range from 5.0 nM to 9.0 μM. In addition, by combining the unique advantages of hydrogel materials and smartphone technology, a simple, real-time and quantitative platform for Ag+ monitoring was constructed, highlighting its potential for practical applications in Ag+ detection.
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Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-15
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IF 12.264
Liu Siyang,Hu Fangyuan,Shao Wenlong,Zhang Wenshu,Zhang Tianpeng,Song Ce,Yao Man,Huang Hao,Jian Xigao
2D MXenes are attractive for energy storage applications because of their high electronic conductivity. However, it is still highly challenging for improving the sluggish sodium (Na)-ion transport kinetics within the MXenes interlayers. Herein, a novel nitrogen-doped Ti 3 C 2 T x MXene was synthesized by introducing the in situ polymeric sodium dicyanamide (Na-dca) to tune the complex terminations and then utilized as intercalation-type pseudocapacitive anode of Na-ion capacitors (NICs). The Na-dca can intercalate into the interlayers of Ti 3 C 2 T x nanosheets and simultaneously form sodium tricyanomelaminate (Na 3 TCM) by the catalyst-free trimerization. The as-prepared Ti 3 C 2 T x /Na 3 TCM exhibits a high N-doping of 5.6 at.% in the form of strong Ti–N bonding and stabilized triazine ring structure. Consequently, coupling Ti 3 C 2 T x /Na 3 TCM anode with different mass of activated carbon cathodes, the asymmetric MXene//carbon NICs are assembled. It is able to deliver high energy density (97.6 Wh kg −1 ), high power output (16.5 kW kg −1 ), and excellent cycling stability (≈ 82.6% capacitance retention after 8000 cycles).
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ANALYTICA CHIMICA ACTA
·
2024
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IF 5.7
Gangbing Zhu,Jieling Hou,Juan Xu,Jing Li,Chenxu Wang,Yinhui Yi
Background Heavy metal pollution poses a serious threat to the ecological environment. Mercury ion (Hg 2+ ) is a class of highly toxic heavy metal ions, which is bioaccumulative, difficult to breakdown, and has a significant affinity with sulfur and thiol-containing proteins, which seriously affects environmental safety and human health. Nanozyme-based sensing methods are expected to be used to detect toxic heavy metal ions. However, the application of precious metal nanozymes to develop portable sensors with simplicity, high stability, and high sensitivity has not been explored to a large extent. Results In this paper, based on MXene's unique adsorption capacity for certain precious metal ions, PtNPs/Ti 3 C 2 T X NR composites were successfully prepared by in-situ growth of Pt nanoparticles (PtNPs) on the surface of Ti 3 C 2 T X MXene nanoribbons (Ti 3 C 2 T X NR) using the hydrothermal technique. Experimental data revealed PtNPs/Ti 3 C 2 T X NR exhibited superior peroxidase-like activity, attributed to the synergistic effect of well-dispersed ultrasmall PtNPs and electron transfer effect. Hg 2+ can significantly inhibit enzyme-like activity of PtNPs/Ti 3 C 2 T X NR due to specific capture and partial in-situ reduction of PtNPs, so a colorimetric sensor was constructed for ultra-trace detection of Hg 2+ with a linear range of 0.2 nM and 400 nM. Furthermore, using the portable detecting capabilities of smartphones and hydrogel, a smartphone-assisted hydrogel sensing platform of Hg 2+ was constructed. Notably, the two-mode sensing platforms exhibited outstanding detection performance with LOD values as low as 15 pM (colorimetric) and 26 pM (hydrogel), respectively, superior to recently reported nanozyme-based Hg 2+ sensors. Significance Compared with other methods, the PtNPs/Ti 3 C 2 T X NR-based dual-mode sensor designed in this paper has superior sensitivity, high selectivity, simple operation and portability. In particular, the dual-output sensing strategy enables self-confirmation of detection results, greatly improving the reliability of the sensor, and is expected to be used for the on-site determination of trace mercury ions.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Enpu Tan,Yu Liu,Chunyan Hu,Zhijia Zhu,Baojiang Liu
Moisture-enabled electricity generator (MEG) technology converts energy from the environment into green electricity by exploiting the interaction between atmospheric moisture and hydrophilic materials and has the advantages of a simple device structure, small geographical and temporal constraints, and environmental friendliness; therefore, it has great application value in serving as a power source for portable electronic devices. However, the high output performance of most MEG devices is dependent on high ambient relative humidity (RH), and current MEG technologies tend to be poorly flexible and lack wearability, which severely pose a barrier to their practical utilization. Here, we have developed a high-performance bilayer MEG with exceptional environmental adaptability and stretchability. By rationally combining Ti3C2Tx MXene-loaded cotton knitted fabrics (MC) and a stretchable double-network ionic hydrogel (IH) to form the MXene/cotton-ionic hydrogel MEG (MCIH-MEG), the MCIH-MEG with 230% stretchable capacity can continuously provide an open-circuit voltage (Voc) of 0.5 V and a short-circuit current (Isc) of 50 μA, which stem from the continuous water evaporation within the device and fast capillary water flow on MXene nanosheets, as well as redox reactions at the electrodes, which can achieve good electrical performance across a wide range of temperatures (0–80 °C) and RH levels (20–95%). Due to its flexibility, stable electrical output, and sensitivity to external stimuli, MCIH-MEG can be employed in the fabrication of self-powered sensors to detect simple weight changes or even complex gesture changes and in the construction of self-powered smart masks for respiratory monitoring.
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Sensing and Bio-Sensing Research
·
2025
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IF 4.9
Xiaohua Jiang,Zhiwen Lv,Changquan Rao,Xiaowen Chen
Foodborne pathogenic bacteria pose severe threats to human health and often coexist within the same environment. Thus, developing a sensitive and reliable method for their simultaneous detection is critically important. In this study, we first synthesized Ti 3 C 2 T x MXene nanoribbons/copper nanoparticles (Ti 3 C 2 T x NR/Cu) via a simple self-reduction method to modify electrodes for signal amplification. Concurrently, we constructed UiO-66 MOFs encapsulated with distinct probes and gated by target-specific aptamers (Apts) as bio-gatekeepers. We then proposed an innovative electrochemical strategy for the simultaneous detection of two model pathogens: Staphylococcus aureus ( S. aureus ) and Listeria monocytogenes (LM). The Ti 3 C 2 T x NR/Cu nanohybrid synergistically enhanced the current signals of the probes by leveraging the combined advantages of Ti 3 C 2 T x NR and Cu nanoparticles. For S. aureus detection, methylene blue (MB) and S. aureus -specific aptamer (S-Apt) were employed as the probe and bio-gatekeeper, respectively, while ferrocene (Fc) and LM-specific aptamer (L-Apt) were used for LM. Upon target binding, the Apts dissociated from the UiO-66 MOFs, releasing the encapsulated probes (MB or Fc). The resulting current signals, measured at the Ti 3 C 2 T x NR/Cu electrode, enabled the quantitative and simultaneous detection of both pathogens. This platform's modular design allows easy adaptation for detecting other bacteria by simply replacing the aptamers, offering broad potential applications in controlling food safety.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaosheng Du,Jiuao Wang,Linzhao Jin,Sha Deng,Yi Dong,Shaojian Lin
The exploitation of from-stable phase change materials (PCMs) with superior energy storage capacity and excellent solar–thermal conversion performance is crucial for the efficient exploitation of solar energy. Herein, 2D-layered polymerized dopamine-decorated Ti3C2Tx MXene nanosheets (P-MXene) with superior photothermal effects and excellent oxidation stability were synthesized from Ti3AlC2 particles by the selective etching and self-polymerization of dopamine. Then, novel biomass-derived PCM composites, eMPCMs, were fabricated by impregnating erythritol into P-MXene/cellulose nanofiber (CNF) hybrid aerogels. The porous and interconnected 3D aerogels adequately support erythritol and resist liquid leakage during thermal storage. Differential scanning calorimetry (DSC) results showed that the eMPCMs based on P-MXene/CNF aerogels exhibited an extremely high thermal storage density (325.4–330.6 J/g) and excellent PCM loading capacity (up to 1929%). The introduction of P-MXene nanosheets into eMPCMs significantly increased the solar–thermal conversion and storage efficiency, solar–thermal–electricity conversion capacity, and thermal conductivity of the synthesized PCM composites. Moreover, the P-MXene/CNF hybrid aerogel-based PCM composites possessed excellent long-term thermal reliability and thermostability. Hence, the synthesized eMPCMs reveal tremendous potential for efficient solar–thermal storage fields.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yang Yue,Yanxiang Wang,Xiaodan Xu,Chengjuan Wang,Zhiqiang Yao,Dongming Liu
The potential of two-dimensional layered MXenes in electromagnetic wave (EMW) absorption needs further development. Herein, we carried out the in situ growth of carbon nanotubes (CNTs) on the surface of Ti 3 C 2 T x MXene at ultra-low temperature via chemical vapor deposition . The obtained CNTs exhibited a bamboo-like structure and were accompanied by helical carbon nanofibers . The ultra-low temperature solved the problem that the high temperature required in the traditional CNT growth process would destroy the structural integrity of MXene. The lush CNT forest cross-linked the MXene layers, transforming the two-dimensional layered structure into a three-dimensional conductive network, providing abundant conductive channels for carriers, optimizing the impedance matching of the CNT/MXene hybrid, and resulting in a significant dielectric loss. The as-prepared CNT/MXene hybrid exhibited a minimal reflection loss of −52.56 dB (99.9994% EMW absorption) in the X-band. This work proposes a new idea to enhance the EMW absorption properties of Ti 3 C 2 T x MXene and fabricate high-performance MXene-based EMW absorbers.
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