CERAMICS INTERNATIONAL
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2020
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IF 3.83
Xiuyun Zhang,Jingsen Yue,Yunyun Zhao,Zeqiang Yan,Guisheng Zhu,Laijun Liu,Huarui Xu,Aibing Yu
A novel tartaric acid co-precipitation process was firstly reported to prepare tetragonal BaTiO 3 nano-powder with barium chloride, titanium tetrachloride as raw materials and tartaric acid as precipitant agent. The as-obtained BaTiO 3 powder exhibited a small average particle size about 140 nm, which still held a high tetragonality (c/a ratio) of 1.0092, suggesting its promising applications in multilayer ceramic capacitors (MLCC). In addition, this synthetic method will be of general interest to people who focuses on synthesis technology of Ti-based multicomponent oxides nano-materials owing to its outstanding advantages, including mild reaction condition, facile synthetic processes and especially stabilization of (TiO) 2+ even in a high pH about 8.
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ACS Applied Energy Materials
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2021
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IF 6.024
Lili Song,Chunlian Peng,Fan Yang,Lian Wang,Yinhua Jiang,Yuqiao Wang
The charge transport between layers of layered double hydroxide (LDH) with structural stability is generally considered as a key factor in restricting electrochemical performances. Herein, we report the surface spatial confinement effect on Mn–Co LDH@carbon dots (CDs) to enhance charge transfer and the stable structure for high-performance supercapacitors. The surface confined effect should be characterized as the charge transfer and interaction between Mn–Co LDH and CDs using density functional theory calculations. CDs can improve the density of states near the Fermi level to achieve an enhanced conductivity. The geometric structure can remain stable at room temperature within 200 fs by using ab initio molecular dynamics simulations. The two-electrode device gained the energy density of 79 W h kg–1 and a power density of 666 W kg–1 at 1 A g–1. This design concept will help to design, prepare, and assemble the high-efficiency and long-lifetime electrochemical energy storage devices based on various layered materials.
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JOURNAL OF SOLID STATE CHEMISTRY
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2024
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IF 3.2
Xiu-Zhen Yang,Tian-Qi Zhao,Renagul Abdurahman,Shi-Ji Liu,Yao-Xing Han,Yue Zhang,Xue-Bo Yin,Jie Gao
Fluorescence intensity ratio (FIR) technique demonstrates significant potential for non-contact temperature sensing with rapid response time, while the design of FIR probes is particularly intriguing. Herein, we report Pr–Al co-doped MgGa 2 O 4 persistent luminescence nanoparticles (PLNPs), as MgAl 0.04 Ga 1.96 O 4 : 0.1 % Pr 3+ (MAGP), for ratiometric temperature sensing application. Pr 3+ ions function as the emission centers for dual-emission at 612 and 494 nm, while Al 3+ ions adjust the lattice environment around Pr 3+ ions to enhance the luminescence. Consequently, 274 nm excitation induces the emissions at 494 and 612 nm, as the transitions of Pr 3+ for 3 P 0 → 3 H 4 and 1 D 2 → 3 H 4 , respectively. The emission mechanism is substantiated by density functional theory calculations, regarding the electronic transitions of Pr 3+ . Ratiometric temperature sensing is achieved over the temperature range of 303–573 K with the thermally non-coupled mechanism of the 3 P 0 / 1 D 2 energy levels by FIR at 612 and 494 nm, respectively. The maximum relative sensitivity was 0.91 %. The mechanism is corroborated as the non-thermally coupled energy levels through intervalence charge transfer. Thus, the reversible and sensitive response was illustrated for temperature measurement and the non-thermally coupled mechanism is efficient for the design of ratiometric temperature sensors.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2025
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IF 4.6
Xia Lu,Qinyi Gao,Liqing Xu,Yanxin Ren,Fenfen Tong,Yuxin Wang,Linfan Wang,Na Ge,Wupeng Ge
This study successfully synthesized high performance blue emissive carbon dots (ZrN-CDs) using citric acid, zirconium chloride, and ethylenediamine as precursors through a hydrothermal method. The resulting ZrN-CDs exhibit excitation-independent emission characteristics, along with good water solubility, salt resistance, and photobleaching resistance. The fluorescence resonance energy transfer (FRET) mechanisms allow for the selective attenuation of ZrN-CD fluorescence by tetracyclines (TCs). Building on this effect, a dual-emission ratiometric fluorescent sensor was developed by integrating europium ions (Eu 3+ ), featuring an inverse fluorescence signal response to enhance detection accuracy through self-calibration. The fluorescence emission behavior of ZrN-CDs (F 440 ) showed selective quenching in response to TCs, while the characteristic emission of Eu 3+ (F 615 ) exhibited fluorescence enhancement due to the antenna effect (AE). Quantification of common TCs antibiotics, including tetracycline (TET) and oxytetracycline (OTC), was achieved by recording the fluorescence intensity ratio (F 615 /F 440 ). The limits of detection (LOD) for TET and OTC reached 0.029 μM and 0.016 μM, respectively. This method was successfully applied to the detection of TET in bovine, goat, and camel milk, with recovery rates ranging from 83.65% to 106.60%, thereby confirming the reliability and effectiveness of the sensor in practical applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Run Xiong,Bincheng Xu,Zhixuan Chen,Chen Cheng,Ying Wang
Electrocatalytic nitrate (NO 3 − ) reduction reaction (NitRR) provides us a green solution to synthesize ammonia (NH 3 ) and ease environmental problems. However, the development of robust electrodes with high NH 3 yield rates and Faradaic efficiencies (FEs) is still challenging. Herein, we report a self-supporting electrode incorporating vertically aligned Co-based metal-organic framework (MOF) nanosheets (Co-NDC/NF), which facilitates electron and mass transfer for efficient NitRR to NH 3 within a wide range of NO 3 − concentration (0.05−1.0 M). In 1.0 M KOH + 1.0 M KNO 3 electrolytes, such Co-NDC/NF reaches a notable NH 3 yield rate of 19,200 ug h −1 cm −2 , a high FE of 93.9% and excellent electrochemical stability, which is superior to most electrocatalysts. A flow-through reactor with large-area Co-NDC/NF also achieves the continuous production of 1096 mg L −1 NH 3 under an industrial current density. Furthermore, the rapid transformation of *NO 2 − to *NO and selective conversion of *NO to *NOH played critical roles in NitRR toward ultrafast NH 3 production. Our research not only offers a facile fabrication procedure for high-performance electrode, but also gives new insights into the enhanced electron transfer and mass transport within MOF-based electrode in electrochemical reactions.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Yunping Wu,Shuwen Niu,Zhengyu Wei,Lingzhe Meng,Wei Wei
Single-atom catalysts (SACs) with nitrogen-coordinated transition metal sites (M-N x ) hold great promise for electrocatalytic oxygen reduction and oxygen evolution reactions (ORR, OER). Despite substantial achievements based on the confinement pyrolysis and heteroatom-doping methods, the M-N x SACs still suffer from low yield of atomic sites and less tenability of electronic states of M-N x center. Here, an innovate synthesis methodology is proposed for surface integrating Co atoms onto polyoxometalate (POM) and its derivative clusters, which promise to regulate the atomic distribution and coordination environments of Co-N x SACs at the sub-nanometer level. The synthetic procedures exhibit general applicability for a variety of POM clusters to achieve high atomic Co loading up to 9.9 wt%. Steric integration by POM-derived clusters (e.g. MoN) also impart strengthened d-p orbital hybridization of Co-N x SACs by the formation of Co-N-Mo bonding, which surpass common heteroatoms toward modulating the geometric and electronic structures of M-N x SACs, leading to pronounced catalytic activity and durability. This work validates the effectiveness of the unique POM-integration strategy toward atomic dispersion of transition metal, further guides the engineering of M-N x SACs to promote catalytic performance from the sub-nanometer scale.
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CERAMICS INTERNATIONAL
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2024
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IF 5.1
Xiangyue Liu,Bing Li,Bin Duan,Shiying Guo,Shengli Zhang,Nan Meng,Zhaoyang Lou,Tong Liu,Junshan Hu,Hong Ge
Bi 2 O 3 phosphors co-doped with Yb 3+ and Er 3+ ions were successfully synthesized using a high-temperature solid-state method. Under 980 nm near-infrared laser excitation, Bi 2 O 3 : Yb 3+ /Er 3+ phosphors emit strong red light at 658 nm and weak green light at 551 nm. The optimal doping concentrations of Yb 3+ and Er 3+ are 0.10 and 0.02, respectively. This composition results in a red-to-green intensity ratio of 157.6. The red emission is primarily driven by energy transfer, promoting Er 3+ from the 4 I 13/2 level to the 4 F 9/2 level [Yb 3+ ( 2 F 5/2 ) + Er 3+ ( 4 I 13/2 ) → Yb 3+ ( 2 F 7/2 ) + Er 3+ ( 4 F 9/2 )]. The cross-relaxation process lowers the photon population in the 4 F 7/2 level and raises the photon population in the 4 F 9/2 level, leading to the occurrence of a single-band red emission. This phosphor also demonstrates promising potential for optical temperature sensing. It exhibits a maximum relative sensitivity of 3.02 % K −1 at 298 K.
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JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Junshan Hu,Yongqiang Li,Yuxiang Wu,Bin Duan,Keyu Guo,Fengyi Wang,Tong Liu,Wei Jin,Changchun Ding
Herein, a strong red upconversion phosphor of Yb 3+ /Er 3+ co-doped Sc 6 WO 12 was prepared by employing an equivalent substitution approach. When irradiated by 980 nm near-infrared laser, the phosphor emits strong 660 nm red light. The main excitation mechanism for its red upconversion luminescence emission is the energy transfer process, through which the Er 3+ ions is promoted from the 4 I 13/2 energy level to the 4 F 9/2 energy level. In addition, it is noteworthy that the multimode upconversion luminescence phosphor exhibits three different trends upon temperature change, and its upconversion emission integral intensity ratio exhibits a linear relationship with temperature in the range of 298 K–623 K. This special property makes the phosphor promising for applications in optical temperature measurement.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yu Wang,Ailing Pan,Yuhua Ma,Hong Du
Single - atom catalysts (SACs) have attracted extensive attention because of their high atomic utilization and superior catalytic activity. Herein, single - atom Co has anchored on the β - ketoenamine - linked covalent organic framework (Tp-Tta COF) pores and used for remarkable photocatalytic hydrogen(H 2 ) production under Ultraviolet – Visible light (UV – Vis light) irradiation. The single - atom Co is visualized by the aberration - corrected high - angle annular dark - field scanning transmission electron microscopy (AC HAADF - STEM), and the C 3 – Co – N 1 coordination structure is demonstrated by X - ray absorption fine structure (XAFS) measurements. The modified Co 0.4 -SAC/Tp-Tta COF shows a high photocatalytic H 2 production of 1798.5 μmol g −1 h −1 and the Apparent quantum yield(AQY) is 3.02% at 420 nm. The improvement of the activity and stability of the photocatalyst is mainly attributed to the incorporation of Co single-atom that boosts the separation efficiency of photogenerated electron-hole pair and provides well - dispersed active sites. This study provides valuable insights into the development of UV–Vis light-responsive photocatalysts at the atomic level.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Chunyan Fan,Xuxin Song,Yao Tang,Zehao Zang,Yangyang Ren,Lanlan Li,Xiaofei Yu,Xiaojing Yang,Zunming Lu,Xinghua Zhang
Designing catalysts that simultaneously optimize both hydrogen and oxygen evolution reaction (HER and OER) emerges as a critical materials challenge. Co(OH)₂ is recognized as an effective OER electrocatalyst, but the low HER activity limits its application in overall water splitting. In this work, we synthesized sulfur (S) and selenium (Se) doped Co(OH) 2 catalysts with significantly enhanced HER activity using an electrochemical deposition method. The S-Co(OH) 2 and Se-Co(OH) 2 catalysts own low HER overpotentials of 48 mV and 59 mV at 10 mA cm −2 . And they require 1.56 V and 1.64 V at the same current density for water splitting, the sustain stable performance for > 100 h at current densities (100 mA cm −2 ) show their practical durability. Density Functional Theory (DFT) calculations and experimental results reveal that non-metal doping induces electronic reconfiguration of Co and optimizes the ΔG H* value for intermediate formation, thus accelerating hydrogen generation and enhancing the intrinsic HER activity. This work presents an effective strategy for incorporating non-metal elements into transition metal-based catalysts, and provides insight to boost HER intrinsic activity and achieve bifunctional catalytic performance for water splitting.
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JOURNAL OF THE ENERGY INSTITUTE
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2025
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IF 6.2
Haoxin Jiang,Yuyan Zheng,Zhuoya Dong,Hui Ming,Xuqiang Guo,Lihua Cheng,Libo Zhang
The co-pyrolysis of petroleum coke with lignocellulosic biomass components offers a promising route for the high-value utilization of petroleum-refining by-products and sustainable biomass conversion. This study employs coupled Thermogravimetric analysis-Fourier-transform infrared spectroscopy (TGA-FTIR) to systematically examine the co-pyrolysis behaviour and interaction mechanisms between petroleum coke and model lignocellulosic components (cellulose, hemicellulose and lignin) across the temperature range 30–850 °C at heating rates of 5, 10, 15 and 20 °C·min −1 . The results demonstrate that the cellulose–petroleum coke system exhibits optimal volatile-release kinetics at 10 °C·min −1 , with a diffusion coefficient (D = 9.65 × 10 −10 min −2 °C −3 ) and a maximum mass-loss rate (DTG max = −1.47 %·min −1 ). In contrast, the lignin–petroleum coke system shows pronounced synergistic effects at high temperatures (>600 °C), as supported by activation energies of 57.60–84.14 kJ mol −1 and Gibbs free-energy changes (ΔG = 72.23–98.01 kJ mol −1 ), indicating catalytic and flame-retardant potential. Mechanistic insights reveal that lignocellulosic components exert phase-dependent modulation on pyrolysis dynamics, suppressing petroleum-coke hydration, fine-tuning volatile-diffusion kinetics and facilitating graphitization via co-carbonization pathways. These findings provide a scientific basis for the precise engineering of pyrolysis-product characteristics and advance the development of tailored thermochemical conversion strategies.
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Food Bioscience
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2025
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IF 5.9
Kaize Zheng,Xueling Qin,Lingchun Meng,Yusheng Liang,Junwei Qin,Zhenqiang Wu,Zhenfeng Huang
Natural Monascus yellow pigments (MYPs) have potential in the food industry due to their safety, but their application is limited by low biological activity and stability. Novel MYPs complexes, Monascus yellow pigments-tannic acid (MYPs-TA), were synthesized by spontaneously incorporating TA through intermolecular co-pigmentation in this work. Structural analysis revealed that multiple interactions contributed to the formation of complexes, including hydrogen bonding, π-π stacking, and hydrophobic interactions. The MYPs-TA exhibited characteristic ultraviolet signals of both MYPs (380 nm) and TA (276 nm), and the crystalline structure of MYPs transitioned to an amorphous form. These phenomena confirmed the tight combination of MYPs and TA. Color tonality, physicochemical stability as well as antimicrobial and antioxidant activities of MYPs were significantly improved after interaction with TA. Besides, MYPs-TA exhibited optimal stability and functionality in high-temperature processed foods such as baked goods or pasteurized products. This study provides a novel approach for synthesizing functional MYPs complexes with superior stability.
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