JOURNAL OF LUMINESCENCE
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2024
·
IF 3.3
Jingshan Hou,Jie Shi,Langping Dong,Jianghua Wu,Ganghua Zhang,Haijie Chen,Wei Gao,Yongzheng Fang
The discovery of pure-red emitting phosphor is great meaningful for the achievement of high color rendering index white light emitting diodes , but still a challenge due to the strict crystal field limitations. In this work, we demonstrate the preparation of a 630 nm pure-red emitting Ca 3 Si 2 O 7 :Eu 2+ phosphor for the first time through a CO reduction strategy. The changes in crystal field strength caused by different methods for the preparation of Ca 3 Si 2 O 7 :Eu 2+ are investigated and discussed based on the understanding of the thermodynamic theory and structure resolution. Finally, a white light-emitting diode with a high color rendering index (Ra = 98) is accomplished by combining the as-prepared Ca 3 Si 2 O 7 :Eu 2+ pure-red emitting phosphor with a 375 nm chip and the commercial used blue and green phosphors. The results also demonstrate the generalizability of the weak reduction strategy for the exploration of “redder” Eu 2+ doped phosphors.
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Inorganic Chemistry Frontiers
·
2017
·Vol. 4
·期 11
·1791-1797
·
IF 4.036
Jiangli Meng,Jiaqi Fu,Xiaoxuan Yang,Meijie Wei,Song Liang,Hong-Ying Zang,Huaqiao Tan,Yonghui Wang,Yangguang Li
The development of stable, highly active and cheap electrocatalysts towards the oxygen evolution reaction (OER) has been an ongoing challenge due to practical problems such as slow kinetics and high overpotential. Herein, we utilized a one-pot hydrothermal method to prepare cobalt/nickel molybdate hierarchical microflowers on conductive carbon cloth (MMoO4-CC, M = Co, Ni) as three-dimensional self-supported electrodes for the oxygen evolution reaction. CoMoO4-CC showed better catalytic activity than NiMoO4-CC. Benefiting from the synergistic effect of a large active area, fast charge and mass transport as well as a three-dimensional conducting path, the CoMoO4-CC nanosheet electrode showed a large current density and a relatively low starting potential, delivering 10 mA cm−2 current densities at an overpotential of 290 mV and a Tafel slope of 94 mV dec−1. Furthermore, the CoMoO4-CC nanomaterial shows better electrocatalytic stability than IrO2-CCa, which could be a promising electrocatalyst for large-scale water oxidation.
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Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2024
·
IF 2.1
KeJian Xu,XiangYun Zhao,JiaFu Yu,QinYa Nong,Hao Qian
Poly(acrylonitrile-co-styrene) microspheres are utilized in several applications due to their superior mechanical properties, excellent chemical stability, and tunable surface modification. In this work, poly(acrylonitrile-co-styrene) microspheres were synthesized in ethyl acetate usingreflux precipitation polymerization. The average particle size and morphology of microspheres were carefully measured to investigate the responding influencing factors. In the growth process of these microspheres, the average particle size of poly(AN-co-St) microspheres changed a little after 180 min. However, the yield of the microspheres continued to increase until 420 min. The properties of the solvents had a significant impact on both the average particle size and the morphology of the poly(AN-co-St) microspheres. The concentrations of the initiator and the cross-linker have minimal effect on the average particle size of poly(AN-co-St) microspheres. By controlling the monomer content at 25 wt%, the yield of these microspheres could reach 82%. The method is straightforward to operate andthe prepared microspheres exhibithigh sphericity and uniformity. As a result, it shows great promise for thepreparation of submicron poly(AN-co-St) microspheres.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Ting Zhao,Kaiquan He,Xingyi Hu,Pu Hu,Chaoqun Shang
Li S battery suffers from polysulfides' shuttle effect and unsatisfactory redox kinetics. To tackle these issues, we design a multi-functional interlayer based on heterogeneous Mo 2 C/Co confided by N-doped porous carbon (Mo 2 C/Co@NC) via one-step controlled pyrolysis of Co 2+ /MoO 4 2− /2-methylimidazole. The heterogeneous Mo 2 C/Co as active centers effectively immobilizes polysulfides and accelerates their redox transformation kinetics. Moreover, the hierarchical porous NC matrix guarantees rapid electron/ion transport. Acting as an interlayer, the electrochemical evaluation demonstrates desirable performance. Specifically, a high initial discharge capacity of 874.0 mAh g −1 is achieved at 3C, which retains 373.3 mAh g −1 after 1000 cycles (capacity fading rate: 0.057 %/cycle), significantly outperforming battery without interlayer (0.082 %). This work demonstrates an effective heterointerface engineering strategy for the development of Li S battery practical application.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Sajid Ali,Xingwen Cha,Jinxin He,Muhammad Ubaid Ali,Muhammad Junaid Aslam,Songbo Chen,Kok Bing Tan,Guowu Zhan
Tunable electronic properties of supported Cu/CeO2 catalysts are critical for improving the active site activity in catalysis. In this contribution, we propose a surface engineering protocol that utilizes unique ascorbic acid (AA) properties to generate surface defects and modify the electronic properties of Cu–Ce catalysts. This approach relies on forming abundant (Ce3+-Ov) defective sites on the CeO2 surface synthesized with a Ce-benzene-tricarboxylate metal–organic framework (MOF) as a precursor through AA adsorption. Subsequently, Cu sites can be effectively anchored onto the generated Ce3+-Ov, exhibiting excellent electronic transfer between (Ce3+-Ov/Ce4+ ↔ Cu2+/Cu+) CuCe, resulting in highly active Cu+ with well-balanced Ce3+-Ov defects. A high fraction of Cu+ with Ce3+-Ov was dedicated to the presence of AA. The resultant Cu/AA-MOF-CeO2 catalyst demonstrated outstanding performance toward CO oxidation (90–95 °C), being far superior to that of the conventionally prepared Cu/MOF-CeO2 catalyst (110–115 °C). In-depth characterizations confirmed that the remarkable performance was considerably related to the enhanced Cu–Ce interaction, enriched Cu+ active sites, and balanced Ce3+-Ov defects. This work highlights the potential of the Cu/AA-MOF-CeO2 catalyst as a sustainable solution for low-temperature catalytic CO oxidation reaction.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2025
·Vol. 31
·期 2
·65-73
·
IF 8.5
Dong Shengbin,Liu Qi,Gu Haoyuan,Wu Haoran,He Jing,Li Didi,Zhu Minghui
Carbon monoxide (CO) oxidation is crucial for pollutant removal and hydrogen purification. In recent years, copper–cerium (Cu–Ce)-mixed oxide catalysts have attracted significant attention due to their excellent activity and stability in CO oxidation. This study presents an innovative, environmentally friendly electrosynthesis method for producing stable, structured Cu–Ce catalysts in mesh form. This approach addresses the limitations of traditional pellet catalysts, such as fragility and poor thermal conductivity. The results demonstrated that incorporating cerium (Ce) enhanced the catalytic activity for CO oxidation threefold. A series of in situ characterizations revealed that the introduction of Ce led to the formation of a Cu–Ce mixed oxide solid solution, which significantly improved catalytic performance. Furthermore, higher pretreatment temperatures facilitated the decomposition of Ce compounds (nitrate and hydroxide), which promotes the formation of Cu–Ce solid solutions and increases the concentration of active intermediate species (Cu + ‒CO) during the reaction. This process ultimately enhanced the catalyst’s activity.
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Nanoscale
·
2025
·
IF 5.1
Xue Wang,Lu-Kang Zhao,Si-Yao Li,Ran Wei,Xuanwen Gao,Zhaomeng Liu,Wenbin Luo
The electrocatalytic reduction of carbon dioxide (CO2) and different nitrogenous substances has shown a broad prospect in replacing the traditional urea synthesis process, but there are still serious challenges in mass transfer at the gas-liquid-solid interface. Unlike conventional CO2 as a carbon source, the conversion of HCO3- and NO3- to urea by C-N coupling process under environmental conditions is a promising alternative to traditional industrial urea synthesis. However, initiating the C-N coupling reaction through the adsorption and activation of HCO3- and NO3- is considerably challenging. Designing and engineering highly selective and active electrocatalysts is necessary to accelerate electrochemical urea synthesis. Herein, we construct a Mott-Schottky heterogeneous catalyst by loading Cu nanoparticles onto WN nanosheets (Cu-WN), achieving the excellent Faradic efficiency (FE) of 15.9% and urea yield rate of 421 µg h-1 mgcat-1 at -0.3V (vs. RHE), outperforming the majority of reported electrocatalysts. The results show the spatial charge region induced by Mott-Schottky heterostructure facilitates the simultaneous adsorption and activation of HCO3- and NO3-, accelerating the multiple-electron transfer process. This work furnishes a promising impetus for the advancement of urea electrosynthesis via electrochemical C-N coupling under ambient conditions.
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JOURNAL OF HAZARDOUS MATERIALS
·
2012
·
IF 4.173
Min Yang,Aijuan Han,Junling Duan,Zhipeng Li,Yongchao Lai,Jinhua Zhan
In this study, an imprinted silica matrix of pentachlorophenol (PCP) co-loaded with Fe 3 O 4 nanoparticles and ZnS:Mn 2+ quantum dots (QDs) was fabricated. The introduction of Fe 3 O 4 nanoparticles to the imprinted matrix provided an easy way to separate PCP under an external magnetic field. ZnS:Mn 2+ QDs offered a readout signal to monitor the amount of PCP bound to the imprinted matrix and evaluate the efficiency of imprinting. X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy were used to characterize the imprinted matrix. The low angle X-ray diffraction and N 2 adsorption–desorption analysis indicated a periodic mesoporous structure. The as-synthesized imprinted matrix preferred to adsorb PCP rather than the other aromatic compounds like 2,4-dichlorophenoxy acetic acid, 2,4-dichlorophenol and phenol. The recoveries of spiked PCP in spring water and tap water with Fe 3 O 4 –ZnS:Mn 2+ co-loaded MIPs are 101% and 97%, respectively.
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ChemCatChem
·
2025
·
IF 3.9
Pengwei Deng,Haoran Wu,Huayu Wei,Zixu Yang,Jing Xu,Minghui Zhu
Graphical A modified synthesis method on Cu mesh simplifies and enhances the catalyst preparation process and efficiency at a much lower cost. The synergistic interplay between Co and Cu species is further investigated during the 5-hydroxymethylfurfural oxidation reaction. The Co-doped Cu mesh catalyst's scalability, cost-effectiveness, and robust performance underscore its potential for industrial applications in 5-hydroxymethylfurfural electrooxidation. The growing demand for sustainable alternatives to fossil-derived chemicals has spurred significant interest in biomass valorization, with 5-hydroxymethylfurfural (HMF) emerging as a key platform molecule. In this study, an electrochemical synthesis strategy was employed to synthesize a bimetallic Co-doped Cu mesh catalyst for the HMF oxidation reaction. It exhibited remarkable electrooxidation activity during a 3-h reaction at 1.6 V versus RHE with 83.2% HMF conversion, 99.4% 2,5-furandicarboxylic acid (FDCA) selectivity, and 87.7% Faraday efficiency. X-ray diffraction, in situ surface-enhanced Raman spectroscopy, and X-ray photoelectron spectroscopy revealed that the modified Cu mesh catalyst introduced more Co 3 O 4 species. Additionally, in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy elucidated that Cu species on the Co-doped Cu mesh can adsorb *OH and couple with organic molecules during the reaction process. Cu─Co dual active sites enhance the selective electrochemical oxidation of HMF toward FDCA.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Chen Ji,Mingyi Yu,Guojun Li,Zheng Lian,Shule Zhang,Liang Jiao
Piperazine (PZ), as a carbon dioxide (CO 2 ) absorbent with outstanding properties, has been extensively studied on modification and the application as a promoter. However, it is still unclear as to why PZ possesses such excellent properties at present. In this work, we returned to the fundamentals by focusing on PZ and N , N ′-Dimethylethylenediamine (DMEN) as research subjects. Through experimental and computational investigations, we examined the influence of six-membered ring structures on the CO 2 capture performance of PZ. The results of absorption test indicate that the ring structure can reduce the activation energy of the adsorption reaction and increase the cycle capacity, but it also lowers the adsorption rate and reduces the maximum capacity. To further investigate the influence of the ring structure on the absorption process, quantitative 13 C NMR analysis and density functional theory (DFT) calculation were employed. The results indicated that the ring structure enhances steric hindrance effect, thereby promoting bicarbonate formation and improving regeneration performance. This research provides valuable insights for the further development of highly efficient CO 2 capture absorbents based on PZ.
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Materials
·
2025
·Vol. 18
·期 11
·2495
·
IF 3.2
Haosheng Lan,Yi Zhang,Le Ding,Xin Li,Zhanhong Zhao,Yansen Qu,Yingjie Xia,Xinghua Chang
Electrocatalytic nitrate reduction to ammonia (ENRA) presents a promising strategy for simultaneous environmental remediation and sustainable ammonia synthesis. In this work, a Cu–Co bimetallic catalyst supported on functionalized reduced graphene oxide (RGO) was systematically designed to achieve efficient and selective ammonia production. Surface oxygen functional groups on graphene oxide (GO) were optimized through alkaline hydrothermal treatments, enhancing the anchoring capacity for metal active sites. Characterization indicated the successful formation of uniform Cu–Co bimetallic heterointerfaces comprising metallic and oxide phases, which significantly improved catalyst stability and performance. Among the studied compositions, Cu6Co4/RGO exhibited superior catalytic activity, achieving a remarkable ammonia selectivity of 99.86% and a Faradaic efficiency of 96.54% at −0.6 V (vs. RHE). Long-term electrocatalysis demonstrated excellent durability, with over 90% Faradaic efficiency maintained for ammonia production after 20 h of operation. In situ FTIR analysis revealed that introducing Co effectively promoted water dissociation, facilitating hydrogen generation (*H) and accelerating the transformation of nitrate intermediates. This work offers valuable mechanistic insights and paves the way for the design of highly efficient bimetallic electrocatalysts for nitrate reduction and ammonia electrosynthesis.
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RSC Advances
·
2018
·Vol. 8
·期 34
·18966-18971
·
IF 2.936
Zhiwei Lu,Yujuan Chen,Zhaoen Liu,Aoqi Li,Dong Sun,Kelei Zhuo
The development of high energy density and power density supercapacitors is very necessary in energy storage and application fields. A key factor of such devices is high-performance electrode materials. In this work, nitrogen and sulfur co-doped graphene aerogels (N/S-GA) were synthesized using graphene oxide as the precursor and 2-mercapto-1-methylimidazole as both the reducing agent and the N/S doping agent. The pore size distribution of the as-prepared N/S-GA was measured and the N/S-GA possesses a hierarchical porous structure. As an electrode material of supercapacitors, the N/S-GA could provide a suitable structure for charge accommodation and a short distance for ion transport. When 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim]BF4) ionic liquid was used as the electrolyte, the specific capacitance of the N/S-GA electrode material reached 212 F g−1 and 162 F g−1 at the current densities of 1 A g−1 and 10 A g−1, respectively. And the energy density and average power density of the N/S-GA based supercapacitor could reach 117 W h kg−1 and 1.0 kW kg−1 at 1 A g−1, 82 W h kg−1 and 9.5 kW kg−1 at 10 A g−1, respectively. It is believed that the N/S-GA material can be used in high-performance supercapacitors.
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