Solar RRL
·
2022
·Vol. 6
·期 6
·2101032
·
IF 9.173
Junjie Fu,Qingwen Tian,Yachao Du,Qianqian Chang,Yanping Guo,Shengjie Yuan,Zhi Zheng,Sixin Wu,Shengzhong (Frank) Liu
The photovoltaic performance of the kesterite Cu 2 ZnSn(S,Se) 4 solar cells is still far below its predecessor CuInGaSe 2 . One major reason is its severe interface nonradiative recombination at the mismatched Cu 2 ZnSn(S,Se) 4 /CdS heterojunction interface, leading to a large open-circuit voltage loss. Herein, a distinctive indium-incorporation (DI) strategy is developed to deposit an In 1− x Cd x S buffer layer for optimizing the heterojunction interface. The results reveal that adopting this DI method can effectively inhibit the formation of an undesirable secondary phase, and indium can be more easily doped into the bulk lattice of CdS to form additional beneficial shallow donor In Cd defects, which significantly improve the electrical properties of the CdS layer and the quality of the heterojunction interface. Besides, the energy band alignment is adjusted to facilitate the extraction and transfer of interfacial charges, and thus reducing the nonradiative charge recombination at the front Cu 2 ZnSn(S,Se) 4 /CdS heterojunction interface. Consequently, the combination of the above enhances the power conversion efficiency from 10.2% to 12.4%, one of the highest for this type of cells, which corresponds to an open-circuit voltage deficit ( V oc,def ) reduction to as low as 0.54 V. The strategy provides a rational design for optimizing the heterojunction interface of Cu 2 ZnSn(S,Se) 4 solar cells to reduce voltage loss and achieve high efficiency.
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RSC Advances
·
2023
·Vol. 13
·期 20
·13556-13563
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IF 3.9
Xia Xu,Mingqiang Li,Liming Yang,Bing Hu
Reasonable design of bimetallic nanomaterials with support is beneficial to improve catalytic performance. This work reports a new kind of sodium sesquicarbonate-supporting Fe2O3@Pt via etching Fe3O4@Pt@SiO2, which exhibits highly efficient and stable catalytic reduction performance towards 4-NP. Sodium sesquicarbonate-supporting Fe2O3@Pt has an interconnected one-dimensional network structure that provides sufficient channels for mass transfer. At the same time, a large amount of Fe2O3@Pt is exposed on its surface, which hinders the aggregation of pt clusters and Fe2O3 nanoparticles, and facilitates the direct contact of Fe2O3@Pt reaction sites with reactant molecules, thus improving the catalytic rate of 4-NP reduction reaction. Moreover, the introduction of non-metallic Fe can not only reduce the consumption of precious metal Pt, but also improve the catalytic efficiency due to the synergistic effect. This study opens up a new avenue to develop robust catalysts for heterogeneous catalytic reactions.
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PubMed
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 46
·17235-17240
·
IF 4.39
Liujun Deng,Yu Zou,Jiang Jiang
Plasmonic hybrid catalysts have attracted great interest for the reduction of nitrobenzene waste to valuable aminobenzene, because they can use renewable solar energy to accelerate the catalytic reaction. However, the economical synthesis of non-precious plasmonic hybrid catalysts remains a big challenge. Herein we report the synthesis of plasmonic MoO2-embedded MoNi4 nanosheets (MoNi4–MoO2) by thermal annealing of NiMoO4 at 600 °C under a hydrogen atmosphere. The MoNi4–MoO2 hybrid catalysts retain strong plasmon absorption from MoO2 and demonstrate good catalytic activity from MoNi4 for 4-nitrophenol reduction in the dark. Under visible light irradiation, the excitation of MoO2 plasmon promotes the catalytic reaction further due to hot electron-induced increase of catalytic activity of MoNi4. In addition, the hybrid catalysts are relatively stable even under illumination reaction conditions.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 20
·9923-9930
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IF 3.925
Yu Ding,Lihong Yang,Jiwei Shen,Yinmao Wei,Chaozhan Wang
Tyrosinase (TYR), a copper-containing oxidase, has emerged as a predictive biomarker for certain cancers. It is still challenging to develop highly sensitive and selective fluorescent probes for monitoring TYR in biological systems. In this study, we designed a novel fluorescent probe to detect TYR through the nucleophilic substitution reaction of 3-bromomethylphenol with the fluorescent dye 4-methylumbelliferone. Under the catalytic oxidation of TYR, the recognition group of the probe was oxidized to o-benzoquinone, and then a cleavage reaction took place to remove the recognition group and release the fluorophore, so that the fluorescence recovered. The enhancement of the fluorescence intensity was directly related to the activity of TYR. The probe showed high selectivity and sensitivity to TYR with a LOD of 0.2 U mL−1. The feasibility of this probe in real sample assays and cell imaging was also investigated with satisfactory results, providing a practical strategy for detecting TYR activity in biological systems.
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Journal of the Iranian Chemical Society
·
2023
·Vol. 20
·期 5
·1145-1154
·
IF 2.4
Liu Jun,Lan Lixin,Liu Xuanyan,Zhou Quan,Li Rong
In this paper, Cu x OAu–ZnO nano-catalysts with different morphologies were synthesized by one-step replacement method. The nano-catalysts are characterized by scanning electron microscopy, energy-dispersive X-ray analysis, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. These novel Cu x OAu–ZnO nano-catalysts exhibit exceptionally high stability and superior 4-nitrophenol to 4-aminophenol hydrogenation ability. The relationship between catalytic performances and changes of composition were investigated, and the catalytic activity decreased in the following order: Cu x O 30 Au 35 –ZnO > Cu x O 38 Au 35 –ZnO > Cu x O 21 Au 45 –ZnO. The influence of catalytic conditions for the performance of catalysts has also studied. For the Cu x O 30 Au 35 –ZnO catalysts, the rate constant k app could be up to 18.6 × 10 −3 s −1 , and the conversion of the 4-NP could still reach 98.66% after five cycles. The high activity of Cu x O 30 Au 35 –ZnO may be attributed to the synergistic effect between Au and Cu element. The unique structure and high catalytic performance make Cu x OAu–ZnO nano-catalysts for practical applications in 4-nitrophenol reduction.
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GREEN CHEMISTRY
·
2023
·Vol. 25
·期 23
·10091-10100
·
IF 9.8
Mo Zhang,Zheng Li,Yeqin Feng,Xing Xin,Guo-Yu Yang,Hongjin Lv
Selective hydrogenolysis of abundant C–O bonds of β-O-4 linkages in natural lignin or lignin models has been considered as a key strategy for the generation of value-added organic chemicals. Herein, we report a mild, efficient, and selective photocatalytic strategy for hydrogenolytic cleavage of lignin β-O-4 models by using Ni-containing polyoxometalate (POM) catalysts and CdS quantum dots. Upon blue LED light irradiation, the present photocatalytic system can effectively transform various lignin β-O-4 models to the corresponding hydrogenolysis products (phenols and ketones) with >95% conversion and >93% product selectivity. A tentative photocatalytic mechanism is proposed based on various experimental and spectroscopic analyses. The facile strategy presented in our work could be extended to the photocatalytic preparation of various value-added chemicals from natural biomass or other biomass derivatives in the near future.
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ChemistrySelect
·
2023
·Vol. 8
·期 45
·e202303724
·
IF 2.1
Ping Chen,Yu Ling,Hongkai Tong,Ke Dong,Xu Liu,Xiao Chen,Changhai Liang
Graphical 4-Methyl-1-pentene as a branched chain α-olefin can be efficiently synthesized via propylene dimerization on the K−Cu SCALMS catalyst that presents an excellent selective C−C linkage, as well as limits the isomerization of products. The urgent need for branched-chain α-olefin (4-methyl-1-pentene) with excellent characteristics promotes the development of efficient catalysts for the selective dimerization of propylene to it. Based on the concept of supported catalytically active liquid metal solutions (SCALMS), the highly efficient K−M/K 2 CO 3 (M=Fe, Co, Ni, Cu, and Zn) catalysts are prepared by the melting method for the dimerization of propylene. The K−Cu SCALMS catalyst presents highly efficient and excellent selective C−C linkage, as well as limits the isomerization of C6 products. The highest conversion of propylene (64.3 %) with 80.6 % selectivity to 4-methyl-1-pentene with thermodynamic instability is reached at 160 °C, 6 MPa and 20 h. Furthermore, the post-reaction K−Cu SCALMS catalyst can be successfully reactivated in the H 2 atmosphere. Therefore, it is proposed that it may be achieved the continuous selective dimerization of propylene to 4-methyl-1-pentene over K−Cu SCALMS catalyst by the application of fluidized bed technology.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Yao Feng,Jingxue Yuan,Jianhua Kuang,Qingqing Hu,Zhengjun Cheng
Ethyl vanillin (EVA) is a food additive with strict requirements, and the addition of more than the standard will affect the human body, so the design of a fast and sensitive detection method for EVA has aroused people's interest. Here, we developed a fluorescence assay method for the sensitive detection of EVA by 4-mercaptobenzoic acid (4-MBA) coated self-assembled copper nanoclusters (4-MBA-CuNCs). Under alkaline conditions, 4-MBA-CuNCs self-assembled aggregation induces strong blue fluorescence, and its quantum yield is 5.51 %. Under very simple conditions, the fluorescence intensity of 4-MBA-CuNCs at 421 nm was reduced by EVA through static quenching and internal filtration effect. The detection method showed a good linear relationship between 0.1 and 5.1 μM, and its detection limit was 30 nM. Moreover, the preparation of 4-MBA-CuNCs could provide a simple and quick method for the detection of EVA in real samples.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Qitong Mao,Siqi Liu,Yangkai Xiong,Daxiong Hu,Lei Huang,Zhiqiang Fang,Hao Jiang,Haomin Wang,Jipeng Li,Shuhong Mao,Guoqing Wang
At present, there are very few reports on the combination of phosphorescence and fluorescence in the field of pollution prevention. A composite antibacterial agent was designed to store energy by using the phosphorescence effect of rare earth oxides, emit light at night, and stimulate 7-amino-4-methylcoumarin to produce fluorescence and prevent algae from adhering. When complexed with PVA, it exhibited excellent characteristics as an all-weather autocatalytic phosphorescence–fluorescence antifouling hydrogel. The rare earth phosphorescent powder was prepared in a high-temperature tube furnace, coated with SiO2 on the surface for waterproofing, and then grafted with 7-amino-4-methylcoumarin to obtain a composite antibacterial agent with a phosphorescence–fluorescence effect. The composite antibacterial agent was added with PVA to obtain a hydrogel, which exhibited bactericidal rates of more than 99.98% against both Gram-positive and Gram-negative bacteria after 48 h. The results of fluorescence staining showed that the coverage rate of dead bacteria reached 41.6% after 24 h. The tensile strength of the antifouling hydrogel is up to 1.49 MPa, which is strong enough for real marine environments. Moreover, the algae coverage area of the composite hydrogel under natural light was only 2.7%, representing a 10-fold reduction compared with the control. The antifouling hydrogel has good antipollution and algae suppression performance, which is due to the fact that the rare earth phosphorescent powder when exposed to sunlight can provide a light source to stimulate 7-amino-4-methylcoumarin fluorescence at night and thereby prevent algae adhesion. After testing in the marine field and the real sea test when wrapped in a fishing net, the excellent antifouling performance was demonstrated. The functional hydrogel has great application potential in the protection of seawater-exposed structures, such as bridges and bay ports.
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 22
·12739-12750
·
IF 4.4
Liang Kaili,Liu Yang,Hu Lishuang,Liang Jiashun,Lv Tiancheng,Wu Wei,Wang Yanping,Tu Zhiqiong,Hu Shuangqi
Micron-sized titanium particles have potential applications as energetic metal high-enthalpy fuel materials. The molecular perovskite energetic material DAP-4 (H 2 dabco)[NH 4 (ClO 4 ) 3 ] is a potential high-energy oxidizer in solid rocket propellants. To explore the combustion mechanism and energy output of DAP-4-based Ti composites, the combustion characteristics of DAP-4/Ti and F/DAP-4/Ti were studied by electrode ignition device. The results show that the burning rate of DAP-4 can be adjusted by controlling the mass ratio of DAP-4/Ti. After adding Ti into DAP-4, the heat release, self-sustaining combustion time and flame front propagation velocity are greatly increased to 9,113 J g −1 , 265 ms and 0.225 mm ms −1 , respectively, better than those of DAP-4. With Ti added, the decomposition peak temperature of F/DAP-4/Ti dropped from 381.5 to 360.4 ℃. The experimental results contribute to a better understanding of the chemical reaction mechanism and energy release characteristics of DAP-4-based propellants containing Ti.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Shushu Li,Maozheng Li,Ruocheng Shen,Zhenzhen Liu,Xiaoyan Lv,Jing Su,Hongxiang Kuai,Yanxuan Wen
The emergence of layered structure materials has positioned itself as a focal point in the progress of potassium-ion battery (KIBs) cathode materials , as it faces challenges concerning cycling-induced structural stability. In this particular investigation, the successful synthesis of a carbon-coated polyanionic layered composite denoted as K 3 V 3 (PO 4 ) 4 /C has been achieved. K 3 V 3 (PO 4 ) 4 /C was subsequently employed as a novel positive electrode material for KIBs. Upon subjecting it to 100 cycles at a current density of 200 mA g −1 , the discharge specific capacity exhibited a remarkable value of 37 mAh g −1 , thus showcasing a capacity retention of 88%. Impressively, even after undergoing 300 cycles at a high current density of 400 mA g −1 , the capacity retention remained constant at 85%. The superior long-term cycling performance and high capacity retention observed in K 3 V 3 (PO 4 ) 4 /C can be attributed to the inherent stability of the polyanionic layered structure and the dual contributions derived from the carbon coating. Furthermore, the application of characterization techniques such as synchrotron X-ray absorption near-edge structure spectroscopy (XANES) revealed a V valence state of + 3 within the synthesized sample. By establishing a structural model for K 3 V 3 (PO 4 ) 4 /C and conducting first-principles calculations on its band structure and density of states, it was confirmed that the material facilitates electron transfer . An investigation into potassium ion migration and diffusion elucidated the involvement of tetrahedral site hopping (TSH). The successful synthesis of K 3 V 3 (PO 4 ) 4 /C material not only provides valuable insights but also serves as a reference for the development of KIBs cathode materials.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2023
·Vol. 56
·期 49
·495103
·
IF 3.4
Yujiao Ma,Yuzhou Sun,Zihan Zhang,Haokai Zhao,Haifeng Gao,Qing Zhou,Wenbo Li,Xiaoyun Teng,Chao Gao,Wei Yu
In this paper, the open-circuit voltages (VOC) of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells were improved by soaking the CZTSSe films in Cd/NH3 solutions before the deposition of buffer layers. The effects of Cd/NH3 soaking on the properties of CZTSSe films and solar cells were investigated in depth. We found Cd/NH3 soaking can promote downward band bending of the CZTSSe layer at the surface region. In addition, the Cd/NH3 soaking can eliminate the deep level acceptor in CZTSSe and decrease the density of the defects at the absorber/buffer interface. These effects can significantly reduce the carrier recombination in the depletion region of CZTSSe solar cells. As a result, the VOC of CZTSSe solar cells were increased from ∼460 mV to ∼480 mV, the efficiency of the best CZTSSe solar cell was increased from 10.2% to 11.6% by the Cd/NH3 soaking process.
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