Inorganic Chemistry Frontiers
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2020
·Vol. 7
·期 5
·1205-1211
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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
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Jinglian Zhu,Xu Zhang,Haiguang Gao,Yuting Shao,Yana Liu,Yunfeng Zhu,Jiguang Zhang,Liquan Li
Rechargeable magnesium batteries (rMBs) are promising techniques suitable for large-scale energy storage systems with low-cost and high safety. However, their development is severely hindered by strong coulombic effect between bivalent Mg 2+ and cathode materials . In this work, two dimensional hierarchical nano-micro hybrids are synthesized by in-situ generating VS 4 nanosheets on carbon-coated Ti 3 C 2 MXene matrix (denoted as VS 4 @Ti 3 C 2 /C). A high-performance rMB system is built by using the hierarchical nano-micro hybrids cathode, magnesium foil anode, and 0.25 M methylpyrrolidinium chloride in 0.25 M 2PhMgCl-AlCl 3 /tetrahydrofuran as the electrolyte. The existence of V–C bond proves that VS 4 is anchored on the surface of Ti 3 C 2 via a strong chemical bond, rather than simply by adsorption. The unique hierarchical nano-micro structure improves the accessibility of the electrolyte and reduces the charge transfer resistance, leading to a high discharge capacity of 492 mA h g −1 at 50 mA g −1 , an outstanding rate performance of 129 mA h g −1 at 1000 mA g −1 , and excellent cycling performance (over 900 cycles at 500 mA g −1 ). Moreover, reversible intercalation of MgCl + into VS 4 @Ti 3 C 2 /C is revealed by investigating the evolution of the hybrids during different electrochemical states. This study will shed light on designing high-performance MXene-based cathode materials for multivalent batteries.
研究领域:
材料科学
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电化学
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能源存储
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纳米材料
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多价离子电池
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2025
·
IF 6.9
Yiming Wang,Jin Chen,Jianye Shi,Jing Zhang,Yuzhao Ma,Xiaofeng Yang,Yanjun Li
The integration of microscopic material designs and macroscopic structural layouts offers unlimited potential for developing advanced electromagnetic wave (EMW) absorbers. Herein, a pyrolysis-based strategy is reported for the hybridization of Ti 3 C 2 T x MXene nanosheets to achieve relaxation processes and high-density magnetic coupling at the nanoscale. The stratified structure of Ti 3 C 2 T x /Fe-MOF considerably amplifies the active contact region with electromagnetic radiation, thereby inducing numerous reflection/scattering phenomena. Through pyrolytic transformation, derived nanoparticles including Fe, C, Fe 3 O 4 , and TiO 2 establish continuous metal–carbon and carbon-oxide interfaces below 50 nm. Consequently, the heterogeneous interfaces formed between these components establish a harmonious electromagnetic coupling network, where interfacial polarization from numerous heterojunctions promotes charge accumulation and relaxation processes, converting electromagnetic energy into thermal energy. Remarkably, findings indicate that this composite material demonstrates a minimum reflection loss (RL min ) of −47.05 dB when the thickness reaches 1.8 mm. Additionally, this investigation broadens the spectrum of design strategies for premium microwave absorption materials through systematic interface engineering and thermally-controlled phase conversion.
研究领域:
材料科学
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纳米技术
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电磁学
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微波工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
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2025
·
IF 4.7
Xinmeng Zhang,Yifei Ma,Peizhong Feng
Multifunctional flexible sensors have been widely applied in various fields. However, integrating excellent electrical conductivity, mechanical properties, and durability into multifunctional flexible sensors remains a significant challenge. In this study, a PAA/PAM composite hydrogel system containing MXene (Ti3C2Tx) and tannic acid (TA) was introduced to address the above issues. This composite hydrogel aims to solve the long-standing problems of poor stability of conductive networks and limited application scenarios in the field of multifunctional flexible sensors. Through surface engineering of two-dimensional materials and dynamic cross-linking strategies, this composite material achieved performance breakthroughs. Additionally, the material obtained self-healing ability through dynamic hydrogen-bond reorganization. MXene can form a highly conductive network, but its structural degradation due to surface hydroxyl oxidation in an oxidative environment severely limits its practical application. To overcome this limitation, this study innovatively used TA polyphenols to construct an antioxidant layer on the MXene surface. After adding TA, the conductivity of the composite hydrogel decreased by 37.12% within 24 days. Despite this decrease, the multifunctional sensor still maintained high sensitivity for finger movement monitoring, with a current fluctuation of only 0.08%. After adding MXene, the conductivity of the hydrogel increased from 42.9 mS/m to a maximum of 77.5 mS/m. The tensile strain value of the composite hydrogel increased from 0.1 MPa to a maximum of 0.4 MPa. Experimental results show that the strain coefficient (GF) of the optimized composite material at 20% strain is 12.3. Moreover, the tensile strength of the hydrogel is 400% higher than that of the blank control group, highlighting its outstanding performance in numerous wearable applications. In this study, by modifying and protecting the conductive fillers, the sensing and mechanical properties of multifunctional flexible sensors were enhanced, providing a strategy for interface engineering design of two-dimensional materials in multifunctional flexible electronic devices.
研究领域:
材料科学
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柔性电子学
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高分子科学
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传感器技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
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2020
·
IF 6.274
Feng Guo,Hongtao Zou,Qilu Yao,Bin Huang,Zhang-Hui Lu
Selective catalytic decomposition of hydrazine (N 2 H 4 ) to provide a clean energy carrier hydrogen (H 2 ) is a promising alternative to fossil fuels for the future energy economy. NiPt nanoparticles (NPs) dispersed on delamination of TiO 2 -decorated Ti 3 C 2 T x (denoted as DT-Ti 3 C 2 T x ) nanosheets are prepared via a simple wet chemical reduction method and applied as an efficient catalyst for dehydrogenation of N 2 H 4 in aqueous solution. The rich oxygen-containing functional groups on the surface of DT-Ti 3 C 2 T x not only facilitate the formation and immobilization of monodisperse NiPt NPs but also enhance the synergistic effect between metal NPs and MXene support. Among all of the tested samples, the optimized Ni 0.8 Pt 0.2 /DT-Ti 3 C 2 T x nanocatalyst exhibits the 100% H 2 selectivity and best catalytic performance with a TOF value of 1220 h −1 for the selective decomposition of N 2 H 4 at 323 K. In addition, this catalyst also shows excellent catalytic performance for hydrogen production from hydrazine borane (N 2 H 4 BH 3 ) via the hydrolysis of borane group and selective decomposition of hydrazine moiety. The TiO 2 -decorated Ti 3 C 2 T x MXene can be applied as an excellent support to obtain well-dispersed and ultrafine metal NPs for various applications.
研究领域:
材料科学
·
催化
·
能源存储与转换
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Lu Luo,Qianqian Zhang,Diwei Shi,Mizi Fan,Guanben Du,Xuesong Tian,Weigang Zhao
Nickel-cobalt layered double hydroxides (NiCo-LDHs) are considered highly promising electrode materials for supercapacitors (SCs). Nevertheless, their limited conductivity and inherent stacking defects lead to inactive electronic states, thereby constraining their electrochemical performance. Here, a dual-conductive-engineered flexible electrode is fabricated through synergistic integration of in situ constructed 3D porous LDH with Ti 3 C 2 T x nanosheets deposition, establishing a semi-confined reaction microenvironment. The collaborative conductive architecture and confinement-enhanced effects enable continuous modulation of Faradaic reaction kinetics during charge/discharge processes, achieving breakthrough improvements in both energy density and cycling stability. The optimized Ti 3 C 2 T x /LDH/CC-50 electrode delivers a remarkable specific capacitance of 1598.7 F g⁻¹ at 1 A g⁻¹, along with excellent rate performance of 87.2% (10 A g −1 ). Furthermore, the constructed aqueous asymmetric supercapacitor (ASC) delivers an impressive energy density of 72.4 Wh kg − ¹ and remarkable cycling stability (90.5% retention after 10 000 cycles). A flexible solid-state asymmetric SC (FSASC) is also fabricated, showcasing a significant energy density of 83.9 Wh kg − ¹ at 900 W kg − ¹ with excellent mechanical flexibility. DFT simulations further revealed enhanced electron transport and a greater number of active sites due to the reduced energy barrier. This work contributes new insights into the structural design of LDH/MXene nanohybrid electrodes for advanced energy density supercapacitors.
研究领域:
材料科学
·
电化学
·
纳米技术
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储能
·
凝聚态物理
✓ 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）