ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
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2019
·
IF 1.337
Zhen Xiao,Jiawei Zhang,Jing Zhu,Hui Xu,Huanping Wang,Shiqing Xu,Yang Xia
Ho 3+ /Yb 3+ co-doped PbTiO 3 nanocrystals with different content of dopant were successfully prepared via a facile hydrothermal method. The purity, morphology, element distribution, chemical state and up-conversion (UC) photoluminescence (PL) of PbTiO 3 nanocrystals affected by Ho 3+ dopant are investigated systematically. X-ray diffraction (XRD) results illustrate that PbTiO 3 samples with the doping Ho 3+ concentration ranging from 0 to 5 mol-% are perovskite structure. The doping Ho 3+ ions have no change on the crystal structure of perovskite PbTiO 3 . Owing to the non-equivalent substitution of Ho 3+ to Ti 4+ in PbTiO 3 , the particle size of Ho 3+ /Yb 3+ co-doped PbTiO 3 samples is decreased as well as the particle agglomeration is detected. Moreover, Ho and Yb ions have uniform distributions in the PbTiO 3 nanoparticles as the presence of Ho 3+ and Yb 3+ cations. The up-conversion spectra demonstrate that Ho/Yb co-doped PbTiO 3 samples have up-conversion emissions centered at 550 nm, 660 nm and 755 nm, corresponding to the transitions of 5 F 4 ( 5 S 2 )→ 5 I 8 , 5 F 5 → 5 I 8 and 5 S 2 ( 5 F 4 )→ 5 I 7 of Ho 3+ ions. Additionally, the effect of temperature on the UC PL property of Ho 3+ /Yb 3+ co-doped PbTiO 3 system is further investigated. The sensitivity and the trend of Ho 3+ /Yb 3+ co-doped PbTiO 3 samples in temperature from 298 k to 493K are calculated on the basis of fluorescence intensity ratio (FIR) method. Ho 3+ /Yb 3+ co-doped PbTiO 3 nanocrystals are verified the high potential in the optical temperature sensing.
研究领域:
材料科学
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无机化学
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纳米材料
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光子学
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功能材料
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yinhong Xie,Mengchen Chi,Ruichen Dong,Qiong Hu,Zheng Zeng,Lingting Fan,Yaolei Zhang,Hongyu Sun,Yonghong Fan,Yajun Weng
Targeted delivery of therapeutics demonstrates great potential for the treatment of atherosclerosis (AS). However, the uncontrolled cargo release from nanocarriers limits their ability to achieve optimal therapeutic functions and outcomes. Herein, we propose a thermo-responsive phase transformation-based strategy for controlled drug release, enabling precise delivery specifically to atherosclerotic plaque sites. We developed a nanomedicine (PDA@A/G) by encapsulating tetradecanol (TD) with atorvastatin (ATV) and hydrogen sulfide (H 2 S) donor GYY4137 into polydopamine (PDA) nanocapsules featuring a small hole. The phase transition of TD from solid to liquid state within the atherosclerotic microenvironment, which has a temperature of approximately 39 °C, triggers the release of H 2 S and ATV. The release of the therapeutic drug and gasotransmitter exerts synergistic effects in regulating oxidative stress, alleviating inflammation, and improving endothelial function, showing dramatic capacity in inhibiting plaque progression. This strategy provides a novel and highly promising paradigm for the development of nanomedicine aimed at the targeted co-delivery of drug and gasotransmitter in AS therapy.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2026
·
IF 3.1
Shikai Zhou,Xiaolong Wang,Yi Liu,Liuchun Zheng
The accumulation of plastic waste in marine environments poses a significant ecological threat, highlighting the urgent need for intrinsically hydro-degradable polymers. Poly(butylene oxalate) (PBO) hydrolyzes rapidly but its degradation rate is too fast for practical applications. To address this challenge, rigid cyclohexanedimethanol (CHDM) units were introduced into the PBO backbone to synthesize a series of poly(butylene cyclohexanedimethylene oxalate) (PBCO) copolyesters with CHDM content ranging from 19.3 to 75.3 mol%. Their chemical structure, crystallization behavior, thermal and mechanical properties, rheology, and degradation profile were systematically investigated. Results indicated that CHDM incorporation significantly affects properties: crystallinity, melting point, and mechanical strength exhibit a V-shaped trend with increasing CHDM content, whereas thermal stability, glass transition temperature, and melt viscosity increase monotonically. Notably, the seawater degradation rate displays a unique non-monotonic trend, initially accelerating and then substantially slowing as CHDM content increases. The decomposition temperature decreased by 58.8°C, elongation at break increased by 64%, and degradation rate reduced, collectively extending the material's applicable window. This work demonstrates a viable strategy for finely tuning the degradation profile, thermal and mechanical properties of aliphatic polyesters via rigid-unit copolymerization, offering a promising material solution that balances service life and hydrolytic degradability for specific applications.
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INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Ran Wei,Xu Zhao,Liping Li,Guangshe Li
A series of Ni and Co codoped manganese dioxide catalysts with varying Ni/Co ratios were prepared via a two-step hydrothermal-assisted calcination process, in which Birnessite-type δ-MnO2 precursors were first synthesized hydrothermally and then calcined at different temperatures. The optimally performing Ca-NCMO11–500 (Ni/Co = 1:1, calcined at 500 °C) was identified. Systematic investigations revealed that bimetallic doping modulates the local structure and electronic states of the manganese oxide framework. The Ca-NCMO11–500 catalyst exploits Ni–Co synergistic effects to activate lattice oxygen and promote O–O coupling, resulting in superior oxygen evolution reaction activity. Electrochemical measurements demonstrate that Ca-NCMO11–500 achieves 50 mA cm–2 at an overpotential of 237 mV and maintains excellent durability with negligible activity loss over 300 h at 400 mA cm–2. This study elucidates the microscopic mechanism by which Ni and Co codoping strengthens metal–oxygen bonds and enhances lattice oxygen reactivity, providing a rational basis for the design of high-performance manganese-based electrocatalysts.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
·
IF 19.7
Han Liu,Ying-Xue Shi,Jia-Jia Wen,Bin Sun,Yun-Chao Yin,Qi Xue,Xuan Ai,Xin Wang,Yu Chen
An ultrathin two-dimensional twin-boundary-rich PtPd metallene (TB-PtPdene) was successfully synthesized by salt templating. • Pt-Pd alloying and twin interfaces optimize the adsorption energetics of intermediate products. • TB-PtPdene reaches 1.99 A mg PGM −1 for methanol electrooxidation and maintains stability for 800 h. • In situ FTIR and DFT reveal suppressed CO poisoning on TB-PtPdene. • TB-PtPdene enables direct methanol fuel cells with 14.2 mW cm −2 peak power density. Direct methanol fuel cells (DMFCs) are regarded as a highly promising clean-energy technology. Herein, an ultrathin two-dimensional twin-boundary-rich PtPd metallene (TB-PtPdene) is successfully synthesized using a salt-templating method. Structural analyses confirm a homogeneous metallic alloy configuration with reduced coordination environments and optimized electronic structure induced by twin interfaces. Electrochemical evaluations show that TB-PtPdene delivers a mass activity of 1.99 A mg PGM −1 , outperforming commercial Pt black, Pd black, and TB-Ptene for methanol oxidation reaction (MOR). Mechanistic studies reveal suppressed accumulation of poisoning CO intermediates and altered behavior of oxygenated intermediates on TB-PtPdene. Density functional theory calculations further reveal that the twin-boundary-rich PtPd structure modulates the adsorption energetics of MOR intermediates and reduces the uphill free-energy change of the *CHO-to-*HCOO step. TB-PtPdene also maintains substantial catalytic activity during prolonged electrochemical operation, with its structural integrity well preserved after stability testing. When TB-PtPdene is implemented in DMFCs, the assembled device achieves a peak power density of 14.2 mW cm −2 , significantly exceeding that of Pt black-based devices. This work offers an innovative strategy for designing MOR electrocatalysts with both high activity and stability, and deepens the mechanistic understanding of the role of twin defects in catalytic processes. Download: Download high-res image (258KB) Download: Download full-size image
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ACS Applied Nano Materials
·
2026
·Vol. 9
·期 36
·17135-17146
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IF 5.8
Hussain Mansor,Hao Lu,Tabassum Khadija,Nasrullah Abdur Rehman,Fu Yuan,Ma Xinyi,Wei Yajuan,Liu Jia
Urea oxidation reaction (UOR) represents a promising
route for
sustainable hydrogen generation and wastewater purification, serving
as an energy-saving alternative to the oxygen evolution reaction.
Here, we develop a Co-doped AgP 2 /CoP nanoelectrocatalyst
(denoted as CoAgP 2 /CoP), which forms a hierarchical nanostructure.
The nanoelectrocatalyst demonstrates excellent UOR performance, requiring
a low onset potential of 1.23 V vs RHE to deliver 10 mA cm –2 , exhibiting a small Tafel slope of 23.36 mV dec –1 , and maintaining remarkable stability for over 240 h in alkaline
urea electrolyte. Experimental characterization confirms that Co species
are oxidized into catalytically active Co 3+ species, while
phosphorus is transformed into oxidized P–O species that stabilize
the active interface, and Ag facilitates electron transfer. Mechanistic
investigations reveal that, within the composite hierarchical framework,
urea undergoes sequential N–H and C–N bond cleavage
at the P-assisted Co 3+ active sites. The addition of Ag
further reduces the energy barrier for generating high-valence active
species. The hierarchical nanoarchitecture enlarges the electrochemically
active surface area and enhances mass transport. This work highlights
the synergistic effects arising from the multielement composition
and hierarchical nanostructure in promoting urea electrooxidation,
providing a feasible strategy toward energy-efficient hydrogen production
and environmental remediation.
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高影响因子
Nano Energy
·
2023
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IF 17.6
Jiaqi Zhao,Zhenhua Li,Pu Wang,Peng Miao,Run Shi,Geoffrey I.N. Waterhouse,Tierui Zhang
CO photo-hydrogenation is currently attracting a lot of interest as a low energy input technology for the sustainable production of olefins . Herein, a novel photo-driven Fischer-Tropsch to olefins (FTO) catalyst was synthesized by physical mixing a layered-double-hydroxide-derived cobalt catalyst (LD-Co) with a hydrophobic polydivinylbenzene (PDVB). The obtained LD-Co/PDVB catalyst synergistically harnessed the photothermal and catalytic properties of LD-Co with the hydrophobic properties of PDVB to deliver outstanding photothermal FTO performance. Under ultraviolet-visible irradiation, hydrophobic LD-Co/PDVB delivered a higher CO photo-hydrogenation activity than hydrophilic LD-Co, together with a high olefin selectivity (42.72%−50.49%) and greatly suppressed CO 2 selectivity (2.89%−11.50%) compared to LD-Co (12.65%−30.61%) at 180–195 °C. Water vapor adsorption-desorption experiments and water-gas shift (WGS) reaction tests revealed that the hydrophobic modification acted to suppress the WGS reaction, thereby boosting the olefin production and suppressing CO 2 selectivity. The findings demonstrated that a simple hydrophobic modification can be used to regulate the activity and selectivity of catalysts for photothermal FTO reactions, opening new vistas towards improved photo-driven olefin production.
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International Journal of Environmental Research and Public Health
·
2023
·Vol. 20
·期 6
·4902
·
IF 4.614
Ruiqi Wu,Ning Liu,Chengna Dai,Ruinian Xu,Ning Wang,Gangqiang Yu,Biaohua Chen
N2O is a greenhouse gas and a candidate oxidant. Volatile organic pollutants (VOCs) have caused great harm to the atmospheric ecological environment. Developing the technique utilizing N2O as the oxidant to oxidize VOCs to realize the collaborative purification has significant importance and practical value for N2O emission control and VOC abatement. Therefore, the study of N2O catalytic oxidation of tert-butanol based on zeolite catalysts was carried out. A series of molecular sieves, including FER, MOR, ZSM-5, Y, and BEA, were selected as the catalyst objects, and the 1.5% wt Fe and Co were, respectively, loaded on the zeolite catalysts via the impregnation method. It was found that the catalytic performance of BEA was the best among the molecular sieves. Comparing the catalytic performance of Fe-BEA under different load gradients (0.25~2%), it was found that 1.5% Fe-BEA possessed the best catalytic activity. A series of characterization methods showed that Fe3+content in 1.5% Fe-BEA was the highest, and more active sites formed to promote the catalytic reaction. The α-O in the reaction eventually oxidized tert-butanol to CO2over the active site. The Co mainly existed in the form of Co2+cations over Co-BEA samples; the 2% Co-BEA possessing higher amounts of Co2+exhibited the highest activity among the prepared Co-BEA samples.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2023
·
IF 6
Xueying Zhang,Junyan Wang,Xincheng Zhang,Lin He,Hong Sui,Xingang Li
The fine mineral particles often coexist in oil-water emulsions, enhancing the stability of oil-water emulsions. Herein, the micro SiO 2 was used to investigate its synergistic effects with the interfacially-active asphaltenes (IAA) on forming the strong interfacial film at the oil–water interface. This IAA-particle film showed high rigidity, allowing the emulsion droplets (4 μm − 20 μm) to be much more stable than the traditional asphaltene-stabilized emulsions. With the addition of the oxygen containing demulsifier (MJTJU-2, an alternated aliphatic alcohol nonionic polyether), this kind of emulsion could be broken significantly (over 99 % at the demulsifier concentration > 600 ppm and settling time > 45 min) with almost all of the microparticles transferring from oil phase to the water phase as particle net-like film. The optimal concentration (1000 ppm) of demulsifier were obtained. Further mechanistic study by QCM-D suggested that the desorption process of asphaltenes from solid surface could be divided into three main stages: the demulsifier molecules adsorbed and penetrated into the IAA adsorption film on solid surface; the simultaneous desorption of the adsorbed IAA and pre-adsorbed demulsifiers; the IAA film became loose and was destructed by the demulsifiers. AFM tests found that after addition of demulsifiers, the surface force between IAA and silica (0.0589 mN/m) decreased about 37 %. The MD simulation results showed that the demulsifier molecules would adsorb on the IAA film firstly by van der Waals and hydrogen bond, making the film much looser. The demulsifier could interact with the IAA molecule, resulting in desorption of IAA. Simultaneously, the demulsifier could compete for the adsorption sites on the IAA molecules by forming new hydrogen bonds, which destroyed the IAA adsorption layer. As a result, the stable IAA-solid film at oil–water interface could be broken. These findings would provide fundamental understanding to the stability and instability of IAA-solids co-stabilized oil–water emulsions, oil-sludge treatments.
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Batteries-Basel
·
2023
·Vol. 9
·期 6
·307
·
IF 4
Deng Li,Huinan Pan,Zhonghai Lin,Xiulian Qiu,Xinyu Zhao,Wei Yang,Wenzhi Zheng,Fengming Ren
Compared with monometallic selenides, heterogeneous bimetallic selenides have rich phase boundaries and superior electrical conductivity. ZnSe/CoSe2composites were prepared by introducing Zn metal and using ZIF-8/67 as the precursor through the synergistic effect between Zn and Co after selenification. The electrocatalytic conversion of polysulfide is accelerated by ZnSe through chemical adsorption and the catalytic effect. The conductive CoSe2surface provides a rapid diffusion path for lithium ions, accelerating the conversion of the polysulfide. On the basis of their individual strengths, ZnSe and CoSe2can jointly promote the smooth adsorptive–diffuse–catalytic conversion process of polysulfide and induce the growth of lithium sulfide around its heterogeneous interface, thus enhancing the electrochemical performance of the lithium–sulfur battery cathode materials. The ZnSe/CoSe2–S electrode, at the optimal Zn-to-Co ratio of 1:1, has a 790.06 mAh g−1initial specific capacity at 0.2 C and excellent cycling stability at 1 C. After 300 cycles, the final capacity is 300.85 mAh g−1, and the capacity retention rate reaches 82.71%.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Meiqi Mu,Jing Yu,Zhiqian Yao,Suqiong Xu,Chuicai Rong,Xianke Zhang,Zuzhou Xiong,Xingquan Wang,Xiaokang Li,Jujun Yuan
CeO 2 /Co/C composites have been successfully prepared by a template method. When being applied as electromagnetic (EM) wave absorbers, CeO 2 /Co/C composites exhibit stronger EM wave absorption properties than Co/C and CeO 2 /C composites. The enhanced performance can be attributed to the unique structures of CeO 2 /Co/C composites, in which the synergistic effect of conductance loss, polarization loss together with magnetic loss play an important role for improving the EM wave absorption properties. Additionally, the CeO 2 /Co/C composites own more heterogeneous interfaces and high porosity, which promotes the continuous occurrence of interface polarization and dipole polarization, resulting in increased multiple scattering. The CeO 2 /Co/C composites show a RL min of − 55.02 dB and an EAB of 3.29 GHz at the matching thickness of 2.82 mm. This work provides an effective strategy for constructing CeO 2 /Co/C composites for microwave absorbing material with high performances.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Yixi Xu,Yufei Huang,Jia Zhao,Xuhui Han,Chunpeng Chai,Huiling Ma
Two-dimensional nanomaterial MXene Ti 3 C 2 T x with excellent electrical conductivity has received extensive attention in the electromagnetic wave (EMW) absorption field. However, the excessively high permittivity of Ti 3 C 2 T x is not conducive to impedance matching and the absorption of EMW. Considering the low permittivity and mesoporous structure of MOF , in this work, Co/La-MOF were in situ growth on the surfaces of Ti 3 C 2 T x by a facile co-solvothermal method. The obtained Co/La-MOF anchored on Ti 3 C 2 T x (Co/La-MOF/Ti 3 C 2 T x ) composite exhibits low density with excellent EMW absorption performance. Co/La-MOF/Ti 3 C 2 T x -2 (Co 2+ /La 3+ mass ratio of 16:3) shows the minimum reflection loss of − 44.15 dB at 4.00 GHz with the effective absorption bandwidth of 3.67 GHz in the frequency range of 14.03–17.70 GHz under 1.3 mm. In addition, the electromagnetic absorption mechanism of Co/La-MOF/Ti 3 C 2 T x was also investigated. It provides an effective strategy for the preparation of a novel absorber with high EMW absorbing performance.
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