Nanoscale
·
2023
·Vol. 15
·期 6
·2779-2787
·
IF 6.7
Leilei Lan,Xingce Fan,Caiye Zhao,Juan Gao,Zhongwei Qu,Wenzhe Song,Haorun Yao,Mingze Li,Teng Qiu
As an emerging class of two-dimensional (2D) materials, MBenes show enormous potential for optoelectronic applications. However, their use in molecular sensing as surface-enhanced Raman scattering (SERS)-active material is unknown. Herein, for the first time, we develop a brand-new high-performance MBene SERS platform. Ordered vacancy-triggered highly sensitive SERS platform with outstanding signal uniformity based on a 2D Mo4/3B2 MBene material was designed. The 2D Mo4/3B2 MBene presented superior SERS activity to most of the semiconductor SERS substrates, showing a remarkable Raman enhancement factor of 3.88 × 106 and an ultralow detection limit of 1 × 10−9 M. The underlying SERS mechanism is revealed from systematic experiments and density functional theory calculations that the ultrahigh SERS sensitivity of 2D Mo4/3B2 MBene is derived from the efficient photoinduced charge transfer process between MBene substrates and adsorbed molecules. The abundant electronic density of states near the Fermi level of 2D Mo4/3B2 MBene enables its Raman enhancement by a factor of 100 000 times higher than that of the bulk MoB. Consequently, the 2D Mo4/3B2 MBene could accurately detect various trace chemical analytes. Moreover, with ordered metal vacancies in the 2D Mo4/3B2 MBene, uniform charge transfer sites are formed, resulting in an outstanding signal uniformity with a relative standard deviation down to 6.0%. This work opens up a new horizon for the high-performance SERS platform based on MBene materials, which holds great promise in the field of chemical sensing.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Yi-Zhao Chen,Ting-Ting Mao,Song-Yi Liao,Selina X. Yao,Yong-Gang Min
As novel two-dimensional materials, MBenes derived from bulk ternary metal borides (MAB phase) have attracted increasing attention but are limited by their preparation strategy. In this work, MoxBy (MBene) derivatives with an accordion-like structure were successfully prepared by completely etching an Al layer from MoAlB via a molten-salt method. The thermal behaviors, crystal structure, and surface chemical state were analyzed using DSC/TG, XRD and XPS analyses, respectively. The micro-morphology of the obtained MBene was then characterized using scanning electron microscopy and transmission electron microscopy accompanied by EDS mappings. The results reveal that the MBene synthesized at 620 °C (abbreviated as MBene-620) demonstrates its characteristic (020) peak and layered structure. When used as an advanced anode for Li-ion batteries (LIBs), the MBene delivers excellent electrochemical performances with a reversible specific capacity of 638.2 mA h g−1 after 100 cycles at a current density of 0.1 A g−1. As a promising green strategy, this molten-salt method provides a new opportunity to explore the wide-ranging applications of MBene series, particularly in new energy fields of LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Wei Xiong,Xingyu Feng,Tao Huang,Zhencheng Huang,Xuanlong He,Jianhong Liu,Yi Xiao,Xinzhong Wang,Qianling Zhang
Two-dimensional (2D) transition metal borides (MBenes) have emerged as a rising star and hold great potential promise for catalysis and metal ion batteries owing to a well-defined layered structure and excellent electrical conductivity. Unlike well-studied graphene, perovskite and MXene materials in various fields, the research about MBene is still in its infancy. The inadequate exploration of efficient etching methods impedes their further study. Herein, we put forward an efficient microwave-assisted hydrothermal alkaline solution etching strategy for exfoliating MoAlB MAB phase into 2D MoB MBenes with a well accordion-like structure, which displays a remarkable electrochemical performance in sodium ion batteries (SIBs) with a reversible specific capacity of 196.5 mAh g –1 at the current density of 50 mA g –1 , and 138.6 mAh g –1 after 500 cycles at the current density of 0.5 A g –1 . The underlying mechanism toward excellent electrochemical performance are revealed by comprehensive theoretical simulations. This work proves that MBene is a competitive candidate as the next generation anode of sodium ion batteries .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Huiqing Zhou,Haifeng Yang,Yongzheng Zhang,Xiaomin Cheng,Chengru Li,Jianghao Zhu,Jianan Gu,Cheng Ma,Wenming Qiao,Jitong Wang,Licheng Ling
Aqueous zinc-ion batteries (AZIBs) hold significant promise for energy storage; however, the high dissociation energy barriers of bulky hydrated zinc ions ([Zn(H2O)6]2+) induce uneven Zn deposition, leading to severe capacity degradation and a limited cycle life. Herein, an effective desolvation-enhanced zinc anode protective layer is constructed using Mo4/3B2–X nanosheets, in which the etching-induced metal vacancies and –F zincophilic sites endow the layer with a strong affinity for Zn2+ and effectively catalyze the desolvation of [Zn(H2O)6]2+. Experimental and theoretical calculations demonstrate that under the action of Mo4/3B2–X, the desolvation energy of [Zn(H2O)6]2+ can be effectively reduced from 38.99 kJ mol–1 of bare Zn to 27.67 kJ mol–1, significantly promoting greater flux and rapid diffusion of free Zn2+. As a result, this configuration achieves a dendrite-free Mo4/3B2–X-Zn anode with an ultralong cycling life exceeding 2000 h, which is 18 times that of bare Zn. Even under low-temperature conditions at 0 °C, the Mo4/3B2–X-Zn anode maintains stable cycling for over 2800 h with a low overpotential of 58 mV at 0.5 mA cm–2. Pairing with the KVO cathode, the full cell delivers a capacity of up to 291.2 mA h g–1 at 0 °C and the pouch cell achieves 256.9 mA h g–1 under a high mass loading of 9.5 mg cm–2, demonstrating promising commercial potential.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）