ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jie Liu,Qixun Xia,Libo Wang,Qianku Hu,Nanasaheb M. Shinde,Aiguo Zhou
Mo2CTx MXene materials, known for their high conductivity and abundant surface functional groups, are widely utilized as electrode materials in supercapacitors. However, their tendency to stack during electrochemical energy storage hinders their performance. The in situ growth of nanorod-shaped Ni,Co bimetallic metal–organic frameworks (Ni,Co-MOF) on Mo2CTx MXene effectively mitigates this stacking. With their porous structure and high specific surface area, MOFs excel in energy storage, and bimetallic MOFs outperform monometallic ones. The synergy between Mo2CTx MXene and Ni,Co-MOF yields an outstanding performance. In a three-electrode system with 1 M KOH, the Mo2CTx/Ni,Co-MOF composite shows a specific capacitance of 58 mAh g–1 (56.26 mAh cm–3) at 1 A g–1. When used in a Mo2CTx/Ni,Co-MOF//AC asymmetric supercapacitor, it achieves an energy density of 22.7 Wh kg–1(0.022 Wh cm–3) at a power density of 293 W kg–1 (0.284 W cm–3). Future work will focus on enhancing synthesis methods, exploring different bimetallic combinations, and optimizing electrode designs for gas sensors, batteries, fuel cells, biological sensors, and so on, with outstanding performance and sustainability.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Huajun Xu,Honglei Dong,Xintong Liu,He Qiao,Gang Chen,Fei Du,Yohan Dall’Agnese,Yu Gao
Molybdenum carbide (Mo2CTx MXene) did not possess suitable properties for supercapacitors. Herein, a short oxidation method of Mo2CTx in air at moderately high temperatures is proposed for fabricating a Mo2C/MoO3 heterostructure. The stability of Mo2CTx in air up to 700 °C and the phase transition at higher temperatures are confirmed. Such a heterostructure is beneficial in reducing the diffusion energy barrier of H+. In the aqueous system, the Mo2C/MoO3 electrode delivers a capacitance of up to 811 F g–1. A fully assembled symmetric solid-state supercapacitor delivers 224 F g–1 with an excellent retention rate of 91.05% after 7500 cycles. Besides, the supercapacitor can work at the low temperature of −60°, showing good low-temperature properties. The approach presented in this work opens a promising way to turn a neglected MXene, assumed to be unsuitable for supercapacitors, into one of the top-performing supercapacitor electrodes.
研究领域:
材料科学
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储能
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纳米技术
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电化学
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2021
·
IF 4.051
Yuanbo Tan,Mingjie Yi,Zhenye Zhu,Xueting Zhang,Ke Qin,Jiaheng Zhang,Rongshu Zhu
Herein, a mesh carbon-coated MoSe 2 /Mo 2 CT x hybrid material (MoSe 2 /Mo 2 CT x @C) is proposed as an effective catalyst for electrochemical hydrogen evolution reaction (HER). On one hand, the highly conductive Mo 2 CT x substrate enhanced charge transfer ability and effectively prevented the agglomeration of MoSe 2 nanosheets to expose abundant active sites. On the other hand, the carbon coating layer further improved the conductivity and effectively prevented Mo 2 CT x from being oxidized in the environment. Consequently, the unique MoSe 2 /Mo 2 CT x @C hybrid material exhibited excellent HER performance. Specifically, the MoSe 2 /Mo 2 CT x @C catalyst only required an overpotential of 108.3 mV to reach a current density of 10 mA cm −2 and displayed excellent durability under long-term cycling in acidic solution. This research highlights the potential applications of MXene-based composite materials in the energy field.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Junyan Li,Wei Zhang,Xin Ge,Ming Lu,Xiangxin Xue,Zizhun Wang,Nailin Yue,Junkai Zhang,Xingyou Lang,Qing Jiang,Weitao Zheng
Inspired by a well-known architecture notion that load-bearing walls enable maintaining a highly-stable multiple-floored building, superior advantages are afforded via fabricating the NH 4 + ions pre-intercalated Mo 2 CT x MXene (Mo 2 CT x -N) in a mixed solution of NH 4 F and HCl via a simple one-step hydrothermal method. As a result of the synergistic effects of pillared structure, immobilizing -F groups and unlocking Mo-based redox, the Mo 2 CT x -N remarkably delivered a reversible capacity of 384.6 mAh g −1 at 200 mA g −1 after 100 cycles. Our work lays a foundation for fully packaging its optimal performance via carding and architecting the chemistry of the MXene layers and between them.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Ruige Wang,Xin Zhang,Sijie Chang,Sen Jin,Junkai Wang,Chaofan Wang,Yukai Chang,Zhipeng Yu,Qianku Hu,Aiguo Zhou
Here we report a ternary hybrid catalyst, Pt/Mo 2 CT x -rGO, for the electrocatalysis of methanol oxidation in direct methanol fuel cells. Two-dimensional Mo 2 CT x MXene was used to modify reduced graphene oxide (rGO) to obtain a hybrid of Mo 2 CT x -rGO. Thereafter, ultrafine Pt nanoparticles were dispersed on the hybrid to make a ternary catalyst of Pt/Mo 2 CT x -rGO. The electrochemical performance of the catalyst was evaluated in 1 M H 2 SO 4 and 2 M methanol electrolyte as a target analyte. Compared with commercial Pt/C, Pt/Mo 2 CT x -rGO demonstrated 1.5 times larger electrochemically active surface area, 1.9 times higher mass activity, and 33.6 % longer durability. This is because of the strong electronic interaction between Pt and Mo 2 CT x as well as the large surface area of rGO. This work reports a novel electrocatalyst with high activity and long durability for methanol oxidation, and explore a novel application of Mo 2 CT x MXene.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 16
·165403
·
IF 2.9
Yitong Guo,Qixun Xia,Yukai Chang,Libo Wang,Aiguo Zhou
In this work, a new MoO3@Mo2CTx nanocomposite was prepared from two–dimensional (2D) Mo2CTx MXene by in situ oxidization in air, which exhibited wonderful lithium-storage performance as anodes of lithium–ion batteries (LIBs). The precursor Mo2CTx was synthesized from Mo2Ga2C by selective etching of NH4F at 180 °C for 24 h. Thereafter, the Mo2CTx was oxidized in air at 450 °C for 30 min to obtain MoO3@Mo2CTx nanocomposite. In the composite, in situ generated MoO3 nanocrystals pillar the layer structure of Mo2CTx MXene, which increases the interlayer space of Mo2CTx for Li storage and enhances the structure stability of the composite. Mo2CTx 2D sheets provide a conductive substrate for MoO3 nanocrystals to enhance the Li+ accessibility. As anodes of LIBs, the final discharge specific capacity of the MoO3@Mo2CTx composite was 511.1 mAh g–1 at a current density of 500 mA g–1 after 100 cycles, which is about 36.7 times that of pure Mo2CTx MXene (13.9 mAh g–1) and 3.2 times that of pure MoO3 (159.9 mAh g–1). In the composites, both Mo2CTx and MoO3 provide high lithium storage capacity and can enhance the performance of each other. Moreover, this composite can be made by a facile method of in situ oxidation. Therefore, the MoO3@Mo2CTx MXene nanocomposite is a promising anode of LIB with high performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2024
·
IF 24.4
Hsun-Yen Lin,Jyh Ming Wu
Hydrogen (H 2 ) is mainly produced using steam methane reforming, electrolysis, and gasification, which require external energy and special catalysts. A new catalyst by combining MoS 2 nanoflowers (NFs) with metal carbide/nitride nanosheets (Mo 2 CTx MXene) to create a nanosheet bending moment. The MoS 2 @Mo 2 CT x heterostructures achieve a production rate of 1164.8 µmol g −1 h −1 under an application of mechanical force, 4.01 and 3.06 times higher than Mo 2 CTx and MoS 2 alone, due to enhanced charge transfer from MoS 2 's piezoelectricity and Mo 2 CT x 's conductivity. This study introduces a pioneering methodology that harnesses gravitational energy as a continuous mechanical force, simulated using a peristaltic pump, to drive the piezocatalytic hydrogen evolution reaction (HER), achieving a notable hydrogen production rate of 454.1 µmol g −1 over 24 hours and demonstrating a sustained capability for hydrogen generation. The theoretical calculation results validate the piezoelectric potential in water-flow-pressure triggered HER systems. The piezocatalytic HER system, assuming powered by the Hoover Dam, will produce 290.9 kmoles of hydrogen per ton daily, equivalent to utilizing 19 150 kWh of energy in the electrocatalytic system. The simulated gravity-driven water flow using MoS 2 @Mo 2 CT x piezocatalysts for H 2 generation demonstrates superior efficiency by eliminating common thermal energy conversion losses, marking a significant breakthrough in sustainable hydrogen production technologies.
研究领域:
材料科学
·
可再生能源
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Shengzu Xiao,Zhengyao Sun,Zehao Zhang,Pin Ma,Haibo Li
The application of Mo 2 CT x MXene as an anode for lithium-ion batteries (LIBs) is severely limited by the little electrochemical active sites and large diffusion energy barrier of lithium ions. Creating heterostructures between MXene and high-performance secondary materials with unique structure and tunable electron arrangement is an effective strategy. Herein, the heterostructure of P-doped MoO 2 and Mo 2 CT x (Mo 2 CT x /MoO 2 -P) with built-in-electric field and rich oxygen vacancies is constructed to co-regulate the electrochemical performance of battery. This design enables the material with high electronic density of states, improved ability of lithium adsorption and diffusion as well as strong structural stability. As a result, the as-prepared Mo 2 CT x /MoO 2 -P anode delivers excellent rate performance (301.3 mAh g −1 at 5 A g −1 ) and long cycle stability (1062.13 mAh g −1 at 1350 cycles at 2 A g −1 and 345.5 mAh g −1 at 4500 cycles at 5 A g −1 ), which are superior to that of previously reported Mo 2 CT x -based anode materials. Moreover, the Mo 2 CT x /MoO 2 -P||LiCoO 2 full cell offers 341.4 mAh g −1 after 200 cycles at 1 A g −1 , confirming the practicality of Mo 2 CT x /MoO 2 -P.
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
Advanced Materials Interfaces
·
2023
·Vol. 10
·期 7
·2201563
·
IF 5.4
Haonan Li,Libo Wang,Liang Li,Han Li,Yahui Dai,Qianku Hu,Aiguo Zhou,Xuqing Liu
In order to improve the high-temperature friction and wear properties of polyimide (PI), Mo 2 CT x /PI nanocomposite materials are prepared by using 2D Mo 2 CT x MXene as reinforcement. Compared with the properties of pure PI, Mo 2 CT x /PI nanocomposites exhibit significant improvement on thermal stability, hardness, and tribological performance. Especially, the addition of Mo 2 CT x can reduce friction coefficient and wear rate of PI significantly at different temperatures ranging from room temperature (RT) to 200 °C. The hardness and the thermo-degradation temperature of composites increase due to the formation of an organic inorganic structure. In addition, this structure helps to form a protective film containing Mo 2 CT x nanoflakes, iron oxide, molybdenum oxide, and organic compounds during friction, and improve the tribological properties of PI composite.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2023
·Vol. 9
·期 6
·1122-1128
·
IF 9.4
Yanze Wu,Lin Wang,Zhifang Chai,Weiqun Shi
Two-dimensional layered transition metal carbides (MXenes), have huge potential advantage for applications in hydrogen evolution reaction (HER). However, the hindered hydrogen evolution at large current densities and the instability of MXenes during HER remains major challenges. Herein, we report the MoS 2 /Mo 2 CT x nanoarray with aerophobic structure via molten salt synthesis. In situ vertical distribution of MoS 2 nanoarray on the surface of Mo 2 CT x accelerates hydrogen gas release from the electrode, exhibiting significantly enhanced catalytic activity and stability to bare MoS 2 and Mo 2 CT x . The MoS 2 /Mo 2 CT x nanoarray possesses excellent stability at −100 mA/cm 2 for 100 h with only 3% overpotential increase. Our work provides guidance for developing high-stability MXene-based catalysts by virtue of in situ bonding between nanoarray and MXene.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Weiyan Jiang,Zihan Gao,Miao Shen,Jing Zhou,Rui Tang,Linjuan Zhang,Jian-Qiang Wang
The two-dimensional molybdenum carbide (Mo 2 CT x ) has a similar electronic structure to platinum, which has the potential to be one of non-precious metals catalysts for hydrogen evolution reaction (HER). However, the preparation of Mo 2 CT x by conventional HF and LiF–HCl etching method inevitably introduces the –F and –Cl terminations on the surface, which adversely affect activity and stability. In this study, the LiCl–KCl–Li 3 N molten salt was used to treat Mo 2 CT x at 600 °C and atmospheric pressure and introduce nitrogen heteroatoms . After treated in LiCl–KCl–Li 3 N molten salt, the HER performance of nitrogen-doped Mo 2 CT x is improved compared with that of un-doped Mo 2 CT x , which should be attributed to the optimization of the electronic structure of N–Mo 2 CT x and lower hydrogen adsorption energy barrier. This simple molten salt method provides a way to modify non-precious metal HER catalyst and introduce nitrogen heteroatoms.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 22
·10992-11000
·
IF 6.97
Junmei Liang,Chaoying Ding,Jiapeng Liu,Tao Chen,WenChao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
The hydrogen evolution reaction (HER) in alkaline media is key for the cathodic reaction of electrochemical water splitting, but it suffers sluggish kinetics due to the slow water dissociation process. Here, we present a simple strategy to enhance the HER activity in alkaline media by engineering Co-doped MoS2 coupled with Mo2CTx MXene. The improved HER activity might be ascribed to the synergistic regulation of water dissociation sites and electronic conductivity. Co doping could effectively regulate the electronic structure of MoS2 and further improve the intrinsic activity of the catalyst. Mo2CTx MXene served as both the active and conductive substrate to facilitate electron transfer. As a result, the Co-MoS2/Mo2CTx nanohybrids showed dramatically enhanced HER performance with a low overpotential of 112 mV at a current density of 10 mA cm−2 and exhibited excellent long-term stability in alkaline media.
研究领域:
材料科学
·
电化学
✓ 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）