Jiaqi Li,Linan Dun,Fanming Zeng,Chun Li,Zhongmin Su
A novel coordination polymer {[Ho2(DHTA)3(H2O)5]·H2O}n (1) was synthesized by hydrothermal synthesis (DHTA = 2,5-dihydroxy-1,4-terephthalic acid anion). The crystallographic data show that complex1crystallizes in a triclinic system with space groupP1¯, with a = 9.6617(17) Å, b = 11.902(2) Å, c = 13.284(2) Å, α = 100.617(3)°, β = 92.765(2)°, γ = 106.715(2)°, V = 1429.6(4) Å3, Z = 2, C24H24O24Ho2, and Mr= 1026.290. Complex1contains two eight-coordinated metal centers Ho(III). The TGA results show that the weight loss can be ascribed to the removal of the organic component from 400 to 650 °C. At the temperature above 650 °C, the residue is Holmium(III) oxide (Ho2O3). The luminescent results reveal that the complex has potential application as a new green luminescence material.Keywords:holmium(III);luminescence property;coordination polymer;crystal structure;2,5-dihydroxyl-1,4-terephthalic acid
Fengxia Chen,Daojian Tang,Ya Wang,Tuo Li,Jiahai Ma
A novel catalyst which integrates heterogeneous and homogenous Fenton reactions is designed and fabricated by encapsulating 2,5-dihydroxy-1,4-benzoquinone (2,5-DBQ) in ECDP-Fe 3 O 4 , a composite of Fe 3 O 4 nanoparticles immobilized on a β-cyclodextrin polymer (ECDP) with ethylene diamine tetraacetic acid (EDTA) as cross-linking agent. The 2,5-DBQ@ECDP-Fe 3 O 4 has superior catalytic performance for 4-nitrophenol and 2,4-dichlorophenol degradation compared with control systems. Mechanism study revealed that although the initial active site is Fe 3 O 4 loaded on ECDP, the actually catalyst is the iron ions released from Fe 3 O 4 but confined within the composite. EDTA in β-cyclodextrin polymer can improve both the solubility and adsorption capacity to H 2 O 2 of Fe 3 O 4 . The quinone molecules 2,5-DBQ in the β-cyclodextrin cavity can accelerate Fe 3+ /Fe 2+ cycle adjacent to the cavity, thus in favor of the decomposition of H 2 O 2 into OH as main reactive oxidizing species. The current catalyst integrates the advantages of homogeneous and heterogeneous advanced oxidation processes and is promising in practical applications.
Zhimin Li,Xiaofang Deng,Guanhui Chen,Ziyu Zhang,Shengwei Wang,Zhongai Hu,Xiaoquan Lu
The escalating demand for foldable and bendable electronic products underscores the pressing necessity for flexible energy storage devices that offer enhanced reversibility, stability, and efficiency. In this context, organic electrodes have emerged as a focal point of study owing to their tunable structures and remarkable electrochemical characteristics. Thus, designing and constructing organic composite electrodes with electrochemically active material is of paramount importance. Herein, 2,5-dihydroxy-1,4-benzoquinone (DHBQ), an electrochemically active organic molecule, is introduced as a novel material stabilized by a network of abundant hydrogen-bonding interactions. Reduced graphene oxide (rGO) is incorporated to enhance charge transfer, while polyacrylamide (PAM) serves as a flexible framework. These components are integrated through a free radical cross-linking polymerization and solvent substitution process. Density functional theory (DFT) simulations elucidate the synergistic mechanism involving hydrogen bonding and π-π interactions among PAM, DHBQ, and rGO. The optimized DHBQ/rGO/PAM-0.5 electrode exhibits remarkable mechanical flexibility and self-healing ability, with a tensile strain of up to 917%. Electrochemical tests reveal an areal specific capacitance of 809 mF/cm 2 at a current density of 1 mA/cm 2 . The fabricated flexible supercapacitor based on this electrode demonstrates an energy density of 42.3 μWh/cm 2 at a power density of 0.79 mW/cm 2 . Notably, the device maintains its electrochemical performance without degradation under bending conditions ranging from 0° to 180°. The development of this innovative composite combining stretchability, self-healing ability, and excellent electrochemical properties offers a promising approach to designing high-performance flexible electrodes.
危险品化学品经营许可证（带存储）