FUEL
·
2023
·
IF 7.4
Rihong Xiao,Yili Zhang,Zhuo Xiong,Junying Zhang,Yongchun Zhao
Photocatalytic technology has the advantages of environmental friendliness, low energy consumption, and fast reaction speed, which can be applied in the field of visible light mercury removal. High stability and narrow bandgap are fundamental factors for ideal semiconductor photocatalysts. A novel method of hydrothermal synthesis of CQDs/2D-BWO composite catalyst to improve the oxidation efficiency of elemental mercury was proposed. The morphology, physicochemical properties, and optical performance of the materials were fully characterized. The experiment of Hg oxidation efficiency under visible light showed that C 2 /2D-BWO exhibited a Hg removal efficiency of was as high as 86.3 % under visible light and adequate cyclic stability. The effects of SO 2 and NO on Hg oxidation were also studied, and the reasons for the improved of photocatalytic activity of CQDs on 2D-BWO were analyzed based on DFT calculations. The reaction mechanism of the catalytic oxidation of Hg by C 2 /2D-BWO was proposed, and C 2 /2D-BWO was found to be an efficient and stable visible light catalyst.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2020
·
IF 2.65
Liqun Cheng,Xiaoping Dong
Photocatalysis technology has stimulated extensive research interest in various fields, but several limitations, such as the inefficient separation ratio of photo-generated charges and the possible release of metal ions from metal oxides or sulfides, need to be overcome before its practical application. Herein, we fabricated a metal-free carbonaceous composite photocatalyst via modification of 2D polymeric carbon nitride (PCN) with 0D graphene quantum dots (GQDs) by an ultrasound-assisted route. Characterization results clearly indicated the formation of 0D/2D composite structure with an intimately contacted interface, and the type II band structure promotes the charge separation between PCN and GQDs. As a result, an enhanced photocatalytic activity for degradation of dyes was achieved by the GQDs/PCN in comparison to the single PCN and GQDs. Furthermore, multiple cycling tests reflected the GQDs/PCN had relatively high photocatalytic durability. This study provides a facile method to construct carbonaceous composite and demonstrates it is a promising photocatalyst for environmental remediation.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 16
·2102522
·
IF 6.389
Li-Jiao Ma,Hui-Qin Wu,Bi-Yu Chen,Gang Wang,Bing-Xin Lei,Ding Zhang,Dai-Bin Kuang
0D-2D p–n type CsPbBr 3 /BiOCl heterojunction photocatalyst is successfully fabricated via the electrostatic self-assembly process. On the basis of the photoluminescence and photocurrent density results, the CsPbBr 3 /BiOCl composite exhibits a higher charge separation rate than pure BiOCl and CsPbBr 3 . The degradation of Rhodamine B (RhB) result shows that the CsPbBr 3 /BiOCl composite obtains the highest degradation rate of close to 100% within 60 min, which is significantly higher than those of pure CsPbBr 3 (84.21%) and BiOCl (73.57%) because the p–n type heterojunction photocatalyst can promote the separation of photogenerated charge carriers. The free radical capture experiment demonstrates that •O 2 − plays a major role in the photodegradation of RhB. This study may provide insights into designing advanced photocatalysts for the clean-ups of environmental pollutants.
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高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 35
·355701
·
IF 3.953
Guoying Yao,Liang Zhao,Tao Zeng,Zhenyu Yang
Reduced-dimensional (RD) perovskites have shown attractive chemical and physical properties for optoelectronic applications. Incorporating large organic ligands enables infinite tunability in the components and structures. Theoretically, it is feasible to apply multiple types of organic ligands in a single RD crystal to achieve multiple-dimensional perovskites. However, the coexistence of different organic ligands commonly introduces competing crystal growths that inhibit the formation of a more complex crystal structure. Herein, we report a case of mixed-dimensional (MD) perovskite single crystal containing two types of sulfide-containing ligands. We show that the application of ketones can partially oxidize organothiol ligands in the precursor solution. The resultant disulfide-based ligands can be co-incorporated with the thiol-based ligand in a single MD perovskite crystal. X-ray diffraction confirmed that the structure contains both layered and isolated inorganic components constructed by face-sharing lead halide octahedra. Unlike conventional RD structures, the MD perovskite shows an enlarged bandgap with valence band maximum and conduction band minimum being spatially separated, and isotropic optical features, as revealed by x-ray diffraction, spectroscopies, and density functional theory computation.
研究领域:
材料科学
·
化学
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 15
·4893-4902
·
IF 6.177
Keting Feng,Tao Sun,Xiaoyun Hu,Jun Fan,Dongyuan Yang,Enzhou Liu
Photocatalytic H2 evolution is a promising way to obtain green H2 due to its clean and sustainable characteristics. Herein, a series of 0D/2D Co0.85Se/TiO2 heterojunctions were fabricated through a successive two-step hydrothermal strategy. Among them, 15%-Co0.85Se/TiO2 displays the most excellent H2 rate of 2312.5 μmol g−1 h−1, which is 10.3 times and 10.8 times higher than that of TiO2 and Co0.85Se, respectively. And the H2 production rate per electrochemically active surface area of 15%-Co0.85Se/TiO2 is 127.41, which is obviously more than that of TiO2 (14.17) and Co0.85Se (5.39). Based on the core-level alignment method and free radical capture tests, the enhanced activity mainly resulted from the higher electrochemically active surface area and the formation of a p–n heterostructure between TiO2 and Co0.85Se. This research provides a strategy for the development of noble metal-free nanocomposites for efficient photocatalytic H2 production.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Jiangzhou Qin,Baojun Liu,Kwok-Ho Lam,Shijie Song,Xinyong Li,Xia Hu
To improve the photocatalytic efficiency of the N2 reduction reaction, MXene quantum dots (Ti3C2-QDs) and two-dimensional (2D) nickel metal–organic framework (Ni-MOF) with different ratios were fabricated by a simple self-assembly strategy to form type II heterojunctions. The resultant composites showed enhanced absorption and excellent interfacial charge-transfer capabilities according to the optical and photoelectron properties. The optimal Ti3C2-QD/Ni-MOF heterostructure exhibited a considerable ammonia yield rate (88.79 μmol gcat–1 h–1). By means of X-ray absorption near-edge fine structure (XANES) technique, it was found that the interaction of Ti3C2-QD and Ni-MOF could accelerate the electron transfer, and Ni site would be the main area to enrich the electron density as well as adsorb and activate N2. Finally, with the aid of density functional theory (DFT) calculations and in situ Fourier transform infrared spectrometry (FTIR), the reaction pathway and intermediate products were studied.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Weidong Hou,Haiming Xu,Yujie Cai,Zhongwei Zou,Dongya Li,Dongsheng Xia
Enhancing the separation and migration efficiency of the photo-induced carriers is an appealing strategy to augment the photocatalytic performance. Herein, 0D/2D Bi 2 O 2 CO 3 /BiOCl heterojunction with rich interface oxygen vacancy (OVs) was successfully fabricated by in-situ ion exchange avenue using sodium citrate as CO 3 2− source. Multiple characterizations reveal that BOBl can degrade 84% tetracycline hydrochloride (TC) in 60 min, which is 6.4 and 6.0 fold higher than that of BiOCl and Bi 2 O 2 CO 3 , respectively. Moreover, further research found that the impressive activity of 0D/2D Bi 2 O 2 CO 3 /BiOCl emanates from the large surface area and the polishing separation and migration efficiency of the photo-generated carriers induced by the reasonable interface OVs concentration. Additionally, the OVs concentration of Bi 2 O 2 CO 3 , BiOCl and interface in 0D/2D Bi 2 O 2 CO 3 /BiOCl composites were estimated based on Raman and ESR techniques. This work not only provides a novel avenue to identify the components OVs concentration in heterostructure, but also offers a new ideal to ameliorate photocatalytic performance through interfacial defect engineering.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jindou Hu,Xiaoyan Lu,Guiling Ren,Xinhui Jiang,Junhong Li,Anjie Liu,Zhenjiang Lu,Jing Xie,Aize Hao,Yali Cao
Pt based noble metal catalysts are important and efficient electrocatalysts during hydrogen evolution reaction (HER). However, the HER of Pt based noble metal catalysts have poor stability and high cost. Herein, Unique Ru loaded the tungsten carbide/nitrogen doped carbon (Ru-WC/NC) 0D-2D nanocomposites were fabricated by gas-phase reduction pyrolysis process to solve the problem of poor stability and high cost. Specifically, 0D WC-supported ultra-small Ru (∼2 nm) was anchored on nitrogen doped carbon nanosheets. Even with a remarkably low Ru loading of just 2.82 %, the developed catalyst achieves comparable high catalytic performance to that of a 20 % Pt/C catalyst and demonstrates superior stability. Under a current density of 10 mA cm −2 , the Ru (2) -WC/NC catalyst shows an overpotential of 30 mV in acidic conditions and 51 mV in alkaline environments. Additionally, the overpotential of Ru (2) -WC/NC lower than that of commercially 20 % Pt/C at high current densities exceeding 50 mA cm −2 . The total potential of water splitting for the two-electrode system comprising Ru (2) -WC/NC with commercial ruthenium oxide was 1.56 V at 10mA cm −2 . Most importantly, the stability of Ru (2) -WC/NC is much better than that of Pt/C. Theoretical calculation results further revealed that the ΔG H* of Ru (2) -WC/NC catalyst could be reduced through synergistic interactions between Ru and WC, thereby optimizing the kinetics of HER. This study offers both theoretical insights and practical methodologies for the synthesis and evaluation of electrocatalysts modified with low loading of noble metals.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Tingting Si,Hanbo Zhang,Hai Qiu,Xingwei Ge,Xiaohe Jiang,Lan Yuan,Chuang Han
The instability and poor interfacial charge transfer of semiconductor-MXene composites greatly restrict their applications in photoredox catalysis. Herein, we propose a surface passivation strategy to construct a stable and efficient CdS-MXene heterostructure, delaying the oxidation of Ti 3 C 2 T x MXene and simultaneously boosting the heterointerface charge transport, thus strengthening the cocatalytic performance of Ti 3 C 2 T x . The 2-mercaptoethanol (ME) molecules acting as crosslinkers establish intimate interfacial contact between zero-dimensional CdS nanodots and two-dimensional Ti 3 C 2 T x nanosheets, and reduce the interfacial charge transfer energy barrier, which jointly promote the efficient spatial separation of photoexcited charge carriers and result in the enhanced activity for benzyl alcohol dehydrogenation. Furthermore, the hydroxyl groups of ME passivating the unsaturated Ti atoms of Ti 3 C 2 T x , along with their thiol groups showing strong electron-donating effects and oxidation-free radical scavenging ability, cooperatively contribute to the enhanced photostability of CdS-Ti 3 C 2 T x -ME (CdS-T-M) heterostructure. This work illustrates a facile surface passivation engineering approach for reinforcing the heterointerface charge interaction and catalytic behaviors of MXene-based heterostructures.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Min Zhang,Jiacheng Yao,Muhammad Arif,Bo Qiu,Hongfei Yin,Xiaoheng Liu,Shen-ming Chen
The electronic transmission mode can effectively influence the photogenerated electron-hole separation efficiency, which further influence the photocatalytic hydrogen production performance. Herein, we synthesized a CeO 2 /ZnIn 2 S 4 composite photocatalyst having a 0D/2D heterojunction by facile solvothermal and room temperature precipitation methods. The successful construction of the heterojunction was demonstrated by XRD and XPS. Meanwhile, the interesting findings shows that the 0D “chess” CeO 2 compounded on the 2D “checkerboard” ZnIn 2 S 4 in SEM and TEM. The ESR test of O 2 − and OH demonstrates the photocatalytic mechanism of Z-scheme electron transport in the catalyst. The highest hydrogen production rate of the catalyst reaches 847.42 μmol·g −1 ·h −1 . This work provides a simple and effective strategy to achieve a rationally design photocatalyst for efficient, stable and cost-effective solar hydrogen production applications.
研究领域:
材料科学
·
能源化学
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Materials
·
2022
·Vol. 15
·期 6
·2180
·
IF 3.748
Salma Maneno Masawa,Jihong Li,Chenxu Zhao,Xiaolong Liu,Jianxi Yao
Bismuth-based perovskites are potentially a promising alternative for lead-free perovskites. During bond formation, however, trivalent ions onCs3Bi2I9with CsI/BiI3ratio of 1.5/1 form 0D-neutral charged compounds with higher bandgap (>2.0 eV) and poor absorption capacity. Mixed 0/2-dimensional structures are potentially suitable substitutes due to their low bandgap. So far, the reported CsI/BiI3ratios for 0D/2D structures are 1:1, 1:2 and 1:3. Herein, a new ratio of 1/1.5 is reported. Caesium bismuth iodide at a ratio of CsI/BiI3of 1/1.5 was synthesised using a one-step processing method with/without solvent vapour annealing. During solvent annealing, a 1/4 (v/v) mixture of DMF/methanol was used as a solvent. The crystal structure formed at a ratio of 1/1.5 is more similar to 1.5/1 than to 1/3. The XRD pattern revealed additional characteristics peaks at 009, 012, 209 and 300, indicating the growth of another phase. The formed heterogeneous mixed 0D/2D structure has an extended light absorption capacity greater than 720 nm. Solvent vapour annealing improved film morphology by enhancing grain size and packing density. When cells with and without solvent vapour annealing are compared, the power conversion efficiency of caesium bismuth iodide increases from 0.26% without solvent annealing to 0.98% with solvent vapour annealing. This study establishes a new route for future research on crystal configuration, nomenclature, film and morphology, quality tailoring and applications toward the goal of lead-free perovskite solar cells.Keywords:perovskite solar cells;lead-free;solvent vapour annealing;caesium bismuth iodide
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Jingjing Liu,Bicheng Zhu,Liuyang Zhang,Jiajie Fan,Jiaguo Yu
It is imperative to seek for novel materials with pronounced gas sensing performance towards triethylamine for the sake of human health. Herein, we successfully fabricate an outstanding triethylamine sensor based on CdS/ZnO composite with 0D/2D structure, which are prepared by in-situ growth of CdS quantum dots on ultra-thin ZnO nanosheets . The ratios between the two ingredients are adjusted and their effect is evaluated. The optimal sample exhibits the lowest operating temperature of 200 °C, the highest response value of ~20 and the fastest response time of 2 s. Besides, it also has the virtues of durable stability, excellent selectivity and superior anti-interference ability. The mechanism behind the aforementioned intriguing performance is investigated by X-ray photoelectron spectroscopy, Kelvin probe and density function theory (DFT) simulation. All the results verify that the enhanced gas sensing properties are derived from splendid 0D/2D structure, n - n heterojunction and large specific surface area. Additionally, this study opens an avenue for designing sensors with 0D/2D structure.
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PubMed
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