INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Jingyang Tian,Chundi Yang,Ruihua Hao,Funan Li,Zhirui Liu,Wei Chen,Yuancai Lv,Chong Lin
Molybdenum sulfide (MoS 2 ) as a graphene-like sheet material has attracted wide attention owing to the potential for hydrogen evolution reaction (HER). However, the large-scale application of MoS 2 is still difficult due to the inherent poor conductivity and insufficient active edge sites. Herein, we develop a simple method to grow P-doped MoS 2 nanosheets on carbon cloth for high efficiency HER. The 2D carbon cloth can prevent the stacking of MoS 2 nanosheets and improve the conductivity with the doping of P atoms. As a result, the P–MoS 2 /CC-300 shows the excellent electrocatalytic activity with an overpotential of 81 mV at 10 mA cm −2 and the lower Tafel slope of 98 mV/dec. Furthermore, it also shows the good electrocatalytic durability for 15 h. This work provides an opportunity for the design of excellent and robust MoS 2 -based catalyst via structural engineering and doping method.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 40
·61148-61160
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IF 5.19
Cao Yunmeng,Yue Lin,He Zhuang,Li Zaixing,Lian Jing,Zhou Shilei,Luo Xiao
In this study, the flower-shaped Bi 2 S 3 /g-C 3 N 4 -2.6 heterojunction obtained by solvothermal method and its photocatalytic degradation efficiency of rhodamine B (RhB) and tetracycline (TC) in aqueous solution within 40 min is as high as 98.8% and 94.6%. For RhB degradation, the photocatalytic reaction rate constant (k) of Bi 2 S 3 /g-C 3 N 4 -2.6 is approximately 1.8 and 45.5 times that of Bi 2 S 3 and g-C 3 N 4 . For TC, k is 3.1 and 2.4 times that of Bi 2 S 3 and g-C 3 N 4 , respectively. The key to determining the high catalytic activity of Bi 2 S 3 /g-C 3 N 4 lies in the formation of a good heterojunction between Bi 2 S 3 and g-C 3 N 4 , which accelerates the electron transfer rate between the heterojunction interface and effectively avoids electron–hole recombination. The effects of catalyst dosage, different pH values, inorganic anions, and capture agents on the photodegradation performance of RhB were investigated. The results show that the catalyst dosage is 1.33 g/L, and the solution pH is in the range of 5–9, which has the best removal effect on pollutants, and the isolation of holes ( h + ) with strong oxidizing ability promotes the collapse of pollutant molecules. Combined with electrochemical tests, a possible degradation mechanism was advised.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
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2022
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IF 3.571
Chen Wang,Dongyang Zhu,Jian Zhang,Yingxiang Du
Metal organic frameworks (MOFs), as a novel separation medium s , have in recent years attracted wide consideration in capillary electrochromatography (CEC). However, the instability of frameworks limited the application of the MOF-based chiral separation capillary. Herein, Iron-based γ-cyclodextrin metal-organic framework (Fe-CD-MOF) with mesoporous was developed as the chiral stationary phase in open tubular capillary electrochromatography column (OT-CEC) for the stereoisomer separation of fourteen chiral drugs and one chiral alcohol. The capillary column with MOF coating exhibited the best performance (resolution value: 17.07) for anisodamine in any MOF-based capillary column that has never been reported. Moreover, the effect of pH, buffer concentration, and methanol content has been investigated. The novel coated capillary was also applied for the quantitative analysis of a real sample. The Fe-CD-MOF coated capillary showed outstanding repeatability and stability, with the satisfactory relative standard deviations (RSDs) for intra-day, inter-day, and column-to-column. Finally, the enantioseparation mechanism of the Fe-CD-MOF coated capillary was evaluated by adsorption kinetic experiments. In summary, this work indicated the novel and renewable Fe-CD-MOF was a potential chiral stationary phase in CEC chiral separation.
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CHEMOSPHERE
·
2022
·
IF 8.943
Lei Fan,Yuguo Gong,Jiafeng Wan,Yuhan Wei,Haolin Shi,Chuntao Liu
In this work, flower-like molybdenum disulfide was constructed on the surface of ZIF-8-derived nitrogen-doped dodecahedral carbon (ZNC) for the electrocatalytic degradation of phenol. The flower-like nanostructure of MoS 2 @ZNC contributed to the exposure of more edge-active sites of MoS 2 . At the same time, Mo 4+ and Mo 6+ co-existed in MoS 2 @ZNC, which promoted the generation of H 2 O 2 and •OH, and improved the catalytic activity of composite materials. In addition, electrochemical performance analysis showed that MoS 2 loaded on the surface of ZNC significantly improved the redox capacity of the material, and the composite ratio of MoS 2 and ZNC affected the structure and properties of MoS 2 @ZNC composites. Moreover, the electrochemical performance of prepared MoS 2 @ZNC was evaluated by the generation of hydroxyl (•OH) and the degradation efficiency of phenol. The results showed that MoS 2 @ZNC-2 had an excellent phenol degradation efficiency (98.8%) and COD removal efficiency (86.8%) within 120 min. Furthermore, MoS 2 @ZNC cathode still maintained good performance after being experimented with 20 times, indicated the excellent stability of MoS 2 @ZNC.
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Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-13
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IF 23.655
Ban Chaogang,Duan Youyu,Wang Yang,Ma Jiangping,Wang Kaiwen,Meng Jiazhi,Liu Xue,Wang Cong,Han Xiaodong,Cao Guozhong,Gan Liyong,Zhou Xiaoyuan
The g-C 3 N 4 isotype heterojunction was synthesized for photocatalytic CO 2 reduction, which exhibits an impressive activity and outstanding stability.
The isotype heterojunction presents more favorable charge separation and transfer performance than the single components.
The enhanced photogenerated charge dynamics in isotype heterojunction facilitates the production of key intermediates and thus the whole reaction kinetics.
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Nano Energy
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2022
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IF 19.069
Xinpeng Yao,Benlin He,Jingwei Zhu,Junjie Ti,Lifang Cui,Rui Tui,Meng Wei,Haiyan Chen,Jialong Duan,Yanyan Duan,Qunwei Tang
Precise manipulation on buried interface of perovskite film highly determines the photovoltaic performance of perovskite solar cells (PSCs). Herein, we demonstrate a SnO 2 -SnS 2 heterojunction nanocrystal as an efficient electron transfer material to heal the defective interface for planar all-inorganic CsPbBr 3 PSCs. Arising from the matched lattice distance of SnS 2 with SnO 2 and CsPbBr 3 , an all-in-one SnO 2 -SnS 2 -CsPbBr 3 interface is fabricated, in which SnS 2 plays a role of “bridge” to connect incompatible interface. Consequently, the charge recombination loss is minimized owing to the Type-II band alignment and epitaxial growth induced defect reduction, achieving a remarkable efficiency of 10.72% with a high open-circuit voltage of 1.635V. Considering the high tolerance to high humidity (80%) for 700 h and high temperature (80 °C) over 30 days, these preliminary results can provide a new perspective for the rational design of ideal charge transfer materials to improve the efficiency and stability of PSCs.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Tuxiang Guan,Zhisheng Cheng,Zemei Li,Lin Gao,Kelan Yan,Liming Shen,Ningzhong Bao
The intensive growth of smart portable devices has triggered a boom in the research of all-solid-state flexible supercapacitors. However, the unsatisfactory mechanical flexibility and limited energy density still hinder their practical application. Herein, a combination hydrothermal-assisted assemble strategy is proposed to design reduced graphene oxide fiber/MoS2 nanosheet-assembled composite fabrics (rGOFF–MoS2), where the MoS2 nanosheets vertically grow on the surface of rGO fibers through C–O–Mo covalent bonds. The synthesized rGOFF–MoS2 fabrics present an inter-linkage isotropy skeleton, a robust fusing node, an in situ vertical covalent bridge, an adequate pseudocapacitive reactivity, and a large electrochemical active surface (80.1 m2/g), resulting in fast interlaminar conductivity, great ionic migration and adsorption, and outstanding mechanical stability. The as-prepared flexible electrode displays a large capacitance of 330 F/g at 0.1 A/g (1330 mF/cm2 at 1 mA/cm2) and a high stability (95% capacitance retention after 10,000 cycles) in the H2SO4 electrolyte. Additionally, the assembled solid-state flexible supercapacitor presents an energy density of 69.44 μW h/cm2 (0.5 mW/cm2) and an excellent mechanical flexibility, making the rGOFF–MoS2 fabric a highly competitive candidate for practical applications in next-generation wearable/smart electronics.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 16
·8958-8965
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IF 14.511
Weicai Zhang,Zhuohao Xie,Chaowen Lan,Yinghan Yang,Mingtao Zheng,Hang Hu,Yong Xiao,Yingliang Liu,Yeru Liang
Intimately coupling metal chalcogenides (MCs) with carbon materials is critical for boosting their application performances. However, since MCs and carbon materials are usually two types of incompatible materials, a non-uniform carbon/MC interface is easily formed, especially for multidimensional nanostructures. Herein, we propose an interfacial engineering strategy to enhance the interaction between a three-dimensional nanonetwork-structured carbon aerogel (CA) and MCs. The key to this strategy is the introduction of substantial oxygen-containing functional groups into the CA, which greatly improves its compatibility with MC precursors, and thus enables MCs to grow on the CA framework homogeneously. The optimized CA/MC interface enables extremely compact bonding interaction between the CA and MC nanosheets. Benefitting from a well-organized structure, the synthesized CA@MC composites show remarkable potassium-ion storage performances and electrochemical kinetic properties. As a demonstration, the CA@MoS2 composites show high reversible capacity (389 mA h g−1 at 100 mA g−1), excellent rate performance (capacity retention exceeds 40% with a 5-fold increase of the current density) and an enhanced ion diffusion rate when used as an anode material for potassium-ion batteries.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 14
·6738-6746
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IF 3.925
Xin Dai,Xian-Yi Jin,Rui-Han Gao,Qing-Mei Ge,Kai Chen,Nan Jiang,Hang Cong,Zhu Tao,Mao Liu
Photoelectrochemical water splitting based on g-C3N4 is considered as a promising approach to oxygen generation. Hereinto, an innovative photoanode, g-C3N4/Q[6]–Co NPs, is successfully fabricated by depositing a Co nanocatalyst on the surface of a g-C3N4 film. The nanoparticles are prepared by reduction of a coordination compound of Co[II]–cucurbit[6]uril, in which the macrocycle served as a template and supporter. The resulting g-C3N4/Q[6]–Co NPs provided a significant improvement of the photocurrent density (393 μA cm−2 at 1.23 V vs. RHE) and a higher photoconversion efficiency (0.02419%) than the pristine g-C3N4 catalyst. These results reveal that the high visible light absorption of g-C3N4/Q[6]–Co NPs ensures the formation of a large number of photogenerated electron–hole pairs, and therefore the holes are immediately transferred to the g-C3N4 film through the semiconductor–metal interface, inhibiting the charge recombination process and increasing the photocurrent performance. The approach proposed in this study not only provides a new strategy, in which a macrocyclic compound is employed as the template and supporter in the synthetic process of the nanocatalyst, but also opens a new window for the application of g-C3N4 in PEC water splitting.
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CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Yifan Wang,Zhengjie Peng,Youqing Yang,Zhonnan Li,Yujiao Wen,Meng Liu,Shikai Li,Lezhu Su,Zhi Zhou,Yongfa Zhu,Nan Zhou
The abuse of agrochemicals has caused serious environmental pollution, raising urgently requirement for sensitive controlled release systems. Biochar supported γ-FeOOH nanoarrays (γ-FeOOH@BC) were synthesized in situ through a two-step pyrolyzation-oxidation procedure. The decoration of γ-FeOOH nanoarray structure significantly enhanced the surface positive charge of the composite (pH zpc increased from 2.7 to 7.8), due to which active substances could be electrostatically self-assembled on γ-FeOOH@BC to realize accurate release by changing the environmental pH. The assembled amounts of QNC and PO 4 3- could reach a value of 94 mg·g −1 and 92 mg·g −1 respectively, and the encapsulation efficiency as well as the release concentration were closely related to the pKa of the substance. 45% (QNC) and 63% (PO 4 3- ) could be released at pH = 7.8 and finally both reached to 88% at pH = 11. After 5 rounds of the sensitivity test, QNC/ PO 4 3- could be well assembled or released by pH adjustment, and the encapsulation efficiency remained above 75%. Meanwhile, the assembly structures could also be self-formed in real soil containing QNC/PO 4 3- and had selective herbicidal activity on barnyard grass plants. This work not only provides a feasible material but also a novel method for self-assembly and controlled release of agricultural chemicals.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Xuemei Dong,Minhui Wang,Yecang Tang
A simple and green method for the synthesis of fluorescent carbon nanospheres (CNs) was proposed using chrysanthemum as a natural precursor and ethylenediamine as the co-reagent. The prepared CNs show strong blue fluorescence in water with quantum yield of 13.7 %, and distinguished fluorescent stability against photobleaching and ion strength. Meanwhile, the fluorescence signal of CNs is reversible and sensitive to temperature in the range of 20–80 °C, which makes CNs useful as a temperature sensor. More importantly, the CNs can serve as excellent fluorescent sensors for detecting MnO 4 − and Hg 2+ with the detection limit of 0.72 and 0.26 μM, respectively. MnO 4 − quenches the fluorescence of CNs through inner filter effect and static quenching mechanism, while Hg 2+ forms a stable complex with the amino group on the surface of CNs, resulting in the fluorescence quenching of CNs. However, the stronger affinity between Hg 2+ and captopril (Cap) results in the fluorescence quenched by Hg 2+ recovery after the addition of Cap. Thus, the CNs-Hg 2+ system is employed as a novel sensitive and selective fluorescence “turn-on” sensor for Cap in the range of 0–75 μM. Inspired by the sensing results, the developed sensors were successfully used for the determination of MnO 4 − , Hg 2+ in river water samples and Cap in the pharmaceutical and urine samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
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IF 9.136
Bo Ge,Chenglong Li,Xunkai Zhu,Wenzhi Li,Guina Ren,Zhaozhu Zhang
Potable water shortage and environmental pollution are two major challenges in terms of the development of human society. Inspired by plant transpiration in nature, 3 D photothermal devices are assembled, mainly including: a floating layer composed of hydrophobic Co 3 O 4 and compound photocatalyst, a hydrophilic layer and a Co 3 O 4 photothermal conversion layer. Non-wetting fabrics not only realizes the photothermal device floating on the water surface, but also obtains the ability of removing the organic solvent and water-soluble pollutants. The fabric surface remained non-wettable, proving its mechanical and temperature stability after blade scraping, surface adhesion, sandpaper grinding and a treatment at 300 °C. The photoresponse ability and degradation of pollutants are improved by forming a heterojunction between composite catalyst, and the O 2 – is verified as the main active species. A vapor production rate of 2.34 kg•m −2 •h −1 under 2 sun illumination is achieved through the 3 D photothermal device. The modular design provides guidance for the flexible application of 3 D photothermal devices.
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