SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
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IF 4.3
Haohao Chen,Mingxuan Sun,Junjie Zhao,Xiangzhi Huang,Huanying Teng,Yu Gao,Ziyang Li,Jun Li
Herein, a collection of novel N-Ti 3 C 2 /BiOCl x Br 1−x composites are fabricated via a simple in-situ sonochemical process. Not only the preparation method for N-Ti 3 C 2 but also the photocatalytic system of N-Ti 3 C 2 /BiOCl x Br 1−x are firstly developed. Multiple characterizations jointly demonstrate the successful fabrication of the composites. Compared to that of BiOCl x Br 1−x , the maximum improvements of 1.16, 1.25 and 1.26 folds are severally confirmed for the photocatalytic degradation of levofloxacin, Rhodamine B, and methylene blue over N-Ti 3 C 2 /BiOCl x Br 1−x composites. In addition, through radicals trapping tests, the primary active species in photocatalytic degradation process are verified to be O 2 − . Moreover, N-Ti 3 C 2 /BiOCl x Br 1−x composites also exhibit 1.18 and 1.14 times enhancements for NH 3 production compared with that of BiOCl x Br 1−x with or without the presence of methanol, respectively. In addition, the maximum improvements of photo-current and photo-potential for BiOCl x Br 1−x are 1.29 and 1.86 folds with the introduction of N-Ti 3 C 2 , respectively. The enhanced photocatalytic activity of N-Ti 3 C 2 /BiOCl x Br 1−x composites is owing to the heightened light absorption, increased specific surface area, and accelerated separation of photoinduced carriers. Additionally, the stable photocatalytic properties of N-Ti 3 C 2 /BiOCl x Br 1−x are confirmed by three photocatalytic recycle tests on pollutant degradation and nitrogen reduction combined with X-ray diffraction patterns before and after three recycles. This study suggests that N-Ti 3 C 2 is an efficient ornamentation for boosting photocatalytic activity of BiOCl x Br 1−x , which can also be expanded as a promising modifier for other semiconductors.
研究领域:
材料科学
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环境科学
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光催化技术
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DOI
PubMed
高影响因子
Small
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2022
·Vol. 18
·期 15
·2106581
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IF 15.153
Zhaolin Gou,Huiqi Qu,Hanfang Liu,Yiru Ma,Lingbo Zong,Bin Li,Congxia Xie,Zhenjiang Li,Wei Li,Lei Wang
2D heterostructures provide a competitive platform to tailor electrical property through control of layer structure and constituents. However, despite the diverse integration of 2D materials and their application flexibility, tailoring synergistic interlayer interactions between 2D materials that form electronically coupled heterostructures remains a grand challenge. Here, the rational design and optimized synthesis of electronically coupled N-doped mesoporous defective carbon and nitrogen modified titanium carbide (Ti 3 C 2 ) in a 2D sandwiched heterostructure, is reported. First, a F127-polydopamine single-micelle-directed interfacial assembly strategy guarantees the construction of two surrounding mesoporous N-doped carbon monolayers assembled on both sides of Ti 3 C 2 nanosheets. Second, the followed ammonia post-treatment successfully introduces N elements into Ti 3 C 2 structure and more defective sites in N-doped mesoporous carbon. Finally, the oxygen reduction reaction (ORR) and theoretical calculation prove the synergistic coupled electronic effect between N-Ti 3 C 2 and defective N-doped carbon active sites in the 2D sandwiched heterostructure. Compared with the control 2D samples (0.87–0.88 V, 4.90–5.15 mA cm −2 ), the coupled 2D heterostructure possesses the best onset potential of 0.90 V and limited density current of 5.50 mA cm −2 . Meanwhile, this catalyst exhibits superior methanol tolerance and cyclic durability. This design philosophy opens up a new thought for tailoring synergistic interlayer interactions between 2D materials.
研究领域:
材料科学
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电化学
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催化
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2021
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IF 5.268
Wen Luo,Huaxiao Liu,Xuan Liu,Lixiao Liu,Wenbo Zhao
MXene quantum dots have attracted much attention due to their great optical performance and excellent water solubility. Glutathione (GSH) plays a key role in living cells. In this study, a biocompatibility nanoprobe was prepared for detecting intracellular GSH based on MXene N-Ti 3 C 2 quantum dots (N-Ti 3 C 2 QDs). The N-Ti 3 C 2 QDs act as the fluorescence reporters and the ferric iron (Fe 3+ ) as the quenchers based on nonradiative electron-hole annihilation. When Fe 3+ encounters the amino group of N-Ti 3 C 2 QDs, the electrons of N-Ti 3 C 2 QDs in the excited state will transfer to the half-filled 3d orbitals of Fe 3+ , leading to the fluorescence quenching of N-Ti 3 C 2 QDs. When the N-Ti 3 C 2 QDs/Fe 3+ nanoprobe acts on the cancer cell MCF-7, the abundant GSH in the cancer cells can reduce Fe 3+ to Fe 2+ , which will restore the fluorescence of N-Ti 3 C 2 QDs. The N-Ti 3 C 2 QDs/Fe 3+ nanoprobe displays a high sensitivity for GSH with a detection limit of 0.17 μM in range of 0.5−100 μM. It becomes a promising probe for detecting and showing cellular imaging of GSH in MCF-7 cells. The N-Ti 3 C 2 QDs/Fe 3+ nanoprobe might provide a new way for imaging-guided precision cancer diagnosis.
研究领域:
生物化学
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医学诊断
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材料科学
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DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
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IF 6.3
Xi Wang,Yujie Gao,Jingyuan Ma,Jianing Guo,Yanli Zeng,Mingxing Wu
The mismatched energy level alignments, back interface defects in the perovskite/carbon back interface, as well as low conductivity of carbon counter electrode are the primary factors for the low photovoltaic behavior of all-inorganic hole transport layer (HTL)-free perovskite solar cells (C–PSCs) using carbon counter electrode-based. Herein, 2D layered Ti 3 C 2 and N–Ti 3 C 2 are proposed to form Ti 3 C 2 @carbon and N–Ti 3 C 2 @carbon counter electrodes for modifying the perovskite/carbon back interface. First, the appropriate work function of Ti 3 C 2 can optimize the energy level alignments. Second, nitrogen doping can enhance the conductivity of Ti 3 C 2 which can lower the total resistance of the device. Third, the specific 2D layered structure Ti 3 C 2 and N–Ti 3 C 2 can reduce back interface defects. Therefore, the perovskite/carbon back interface shows improved charge extraction and transport capabilities disclosed by photoluminescence measurements. Consequently, the power conversion efficiencies (PCE) of the C–PSCs are enhanced to 7.56 % from 5.94 % by using Ti 3 C 2 @carbon counter electrode, and further to 8.91 % by using N–Ti 3 C 2 @carbon counter electrode, indicating remarkable PCE improvements of 27.3 % and 50.0 %. Moreover, the Ti 3 C 2 @carbon and N–Ti 3 C 2 @carbon-based C–PSCs show remarkable stabilities under ambient conditions for 30 days. This work is expected to provide a feasible path to optimize the back interface of the all-inorganic C–PSCs.
研究领域:
材料科学
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能源科学
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纳米技术
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DOI
高影响因子
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