INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Hao Chen,Hui-Bin Huang,Hai-Hong Li,Shui-Zhong Zhao,Li-Dong Wang,Jia Zhang,Sheng-Liang Zhong,Cheng-Feng Lao,Li-Ming Cao,Chun-Ting He
Remodeling the active surface through fabricating heterostructures can substantially enhance alkaline water electrolysis driven by renewable electrical energy. However, there are still great challenges in the synthesis of highly reactive and robust heterostructures to achieve both ampere-level current density hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, we report a new Co/CeO2 heterojunction self-supported electrode for sustainable overall water splitting. The self-supporting Co/CeO2 heterostructures required only low overpotentials of 31.9 ± 2.2, 253.3 ± 2.7, and 316.7 ± 3 mV for HER and 214.1 ± 1.4, 362.3 ± 1.9, and 400.3 ± 3.7 mV for OER at 0.01, 0.5, and 1.0 A·cm–2, respectively, being one of the best Co-based bifunctional electrodes. Electrolyzer constructed from this electrode acting as an anode and cathode merely required cell voltages of 1.92 ± 0.02 V at 1.0 A·cm–2 for overall water splitting. Multiple characterization techniques combined with density functional theory calculations disclosed the different active sites on the anode and cathode, and the charge redistributions on the heterointerfaces that can optimize the adsorption of H and oxygen-containing intermediates, respectively. This study presents the tremendous prospective of self-supporting heterostructures for effective and economical overall water splitting.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2023
·
IF 2.7
Xuening Han,Jie Li,Hao Wu,Kai Sun,Yixin Chen,Lijun Jia,Huaiwu Zhang,Pengjie Zhang,Chunyang Wu
In this paper, the Bi-In co-substituted YIG ferrite materials composed of Y 3− x Bi x Fe 4.55 In 0.45 O 12 ( x = 0.0–1.0 with a step of 0.2) were synthesized by a conventional solid-state route. Samples with different Bi 3+ ion contents were sintered at different temperatures. The phase formation, microstructure, dielectric and magnetic properties of samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), impedance analyzer, vibrating sample magnetometer (VSM), and ferromagnetic resonance (FMR). The results showed that Bi 3+ ion substitution could reduce the sintering temperature, increase the bulk density ( d b ), improve the dielectric constant ( ε' = 22.26@100 MHz at × = 1.0) and keep a high saturation magnetization ( 4πM S = 1700–1850 Gs), but led to the increase of the FMR linewidth ( ΔH = 316.21 Oe at × = 1.0).
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Zhimeng Chen,Tiantian Wen,Xueyuan Wang,Lin Yang,Zhongjie Wang,Yanru Qin,Yixue Hu,Tianyu Zhang,Dongna Wang,Amin Liu,Liefeng Zhang,Meng Lei,Yongqiang Zhu
Herein, a cyclodextrin derivative (R6RGD-CMβCD) with tumor target and a carboxymethyl chitosan derivative (M2pep-CMCS) with tumor-associated macrophages 2 (TAM2) target were successfully synthesized, respectively. DOX-loaded nanoparticles (R6RGD-CMβ [email protected] NPs, RCNP DOX ) and R848-loaded nanoparticles ( [email protected] NPs, MCNP R848 ) were prepared. Furthermore, the RCNP DOX and MCNP R848 exhibited good DOX and R848 absorption. Meanwhile, the synergetic cell toxicity of RCNP DOX and MCNP R848 was found. Additionally, RCNP DOX + MCNP R848 nanoparticles greatly promoted the expression levels of cleaved Caspase3, which indicated that the nanoparticles could induce cell apoptosis. At the same time, the immunohistochemical images exhibited that RCNP DOX + MCNP R848 group could effectively transform the phenotype of tumor-associated macrophages. Importantly, in vivo experiments revealed that RCNP DOX + MCNP R848 NPs exerted excellent anticancer effects in tumor-bearing mice. To summarize, RCNP DOX + MCNP R848 NPs are effective anticancer treatment combining chemotherapy and immunotherapy, M2pep-CMCS and R6RGD-CMβCD are good delivery materials.
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PHYSICA B-CONDENSED MATTER
·
2022
·
IF 2.988
Xianzhi Zeng,Haoyi Wu,Junhao Peng,Chuanlong Wang,Guangting Xiong,Yahong Jin,Yihua Hu
The improvement of luminescent properties is important for expanding the application of long afterglow phosphor (LAP). Here, the melilite-type Sr 1·97 MgSi 2 O 7 : Eu 2+ 0.01 , Dy 3+ 0.02 LAP was studied with Bi 3+ as the second co-dopant. Both photoluminescence (PL) and thermoluminescence (TL) were improved in terms of intensity and afterglow lifetime when the doping concentration of Bi 3+ exceeded 2.5 mol%, and the optimized point was 3.5 mol%. As compared to the case of Eu 2+ - Dy 3+ double doping, the improved PL of Eu 2+ - Dy 3+ - Bi 3+ triple doping samples was attributed to better photon absorption . The improved TL and afterglow were attributed to the synergistic strengthening density of the traps by Bi 3+ and the deepening of trapping by Dy 3+ , if their distance was sufficient close. As a result, both TL and afterglow optimized at a concentration of 2 mol% Dy 3+ - 3.5 mol% Bi 3+ coupling.
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CARBOHYDRATE POLYMERS
·
2023
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IF 11.2
Mingzhi Li,Xiaojun Huang,Jiajia Wen,Shikang Chen,Xincheng Wu,Wanning Ma,Steve W. Cui,Mingyong Xie,Shaoping Nie
The law and mechanism of the interaction between polysaccharides and pattern recognition receptors (PRRs) has been unclear. Herein, three glucomannans with different structures were selected to explore the universal mechanism for PRRs to recognize glucomannans. Screening results showed that the silence of TLR4 but not TLR2 severely blocked the production of inflammatory cytokines and the transduction of signal pathways. In-depth results revealed that the participation of myeloid differentiation protein 2 (MD2) and CD14 and the dimerization of the TLR4-MD2 complex were required for glucomannan-activated TLR4 signal transduction . Mannose receptor (MR) was also engaged in glucomannan-induced respiratory burst, endocytosis , and inflammatory signaling pathways in a spleen tyrosine kinase-dependent manner. The internalization of glucomannans into the cytoplasm by MR directly initiated complex intracellular signaling cascades. Finally, molecular docking characterized the binding energy and binding sites between glucomannans and multiple receptors from other perspectives. The essence of glucomannans recognized by PRRs was the non-covalent interaction of multiple receptors and the subsequent transmission of the signal cascade was triggered in a multi-channel and cooperative manner. As a result, the hypothesis that “Innate immune receptors co-recognition of polysaccharides initiates multi-pathway synergistic immune response” was proposed to outline these meaningful phenomena.
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CRYSTENGCOMM
·
2023
·Vol. 25
·期 6
·981-987
·
IF 3.1
Nan Li,Minghao Shi,Wei Zhan,Wenjing Shen,Mianmian Wu,Guifang Sun,Qingfei Li,Jiangquan Ma
Ru-based catalysts are potential substitutes for Pt in the hydrogen evolution reaction (HER). It is worth noting that the Se ions in RuSe2 can modulate the electronic structure of the Ru metal, thus effectively improving the HER kinetics of RuSe2. However, single electronic structure modulation is hard to complete due to the electron deficiency of active Ru atoms. Herein, we prepare and design a novel RuSe2/Co–N–C (RuSe2 nanospheres supported on Co–N–C nanosheets) electrocatalyst with two-electron modulation by a hydrothermal and thermal annealing method. Benefiting from the uniform distribution of RuSe2 nanospheres on Co–N–C nanosheets and Co–N–C nanosheets acting as additional electron donors to make up for the electron deficiency of the Ru metal, RuSe2/Co–N–C exhibits excellent HER performance with a low overpotential of 26.4 mV at 10 mA cm−2 and a low Tafel slope of 53.2 mV dec−1. This work offers an effective method for the synthesis of high catalytic performance electrocatalysts by constructing an interaction between the carrier and the active metal.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Huaiwei Zhang,Yifan Chen,Liang Bao,Jing-yuan Ge
The green synthesis process of photocatalytic ammonia production has received more and more attentions. Herein, a Z-scheme heterojunction with all-solid-state structures is constructed, in which carbon dots can act as electron transferring mediators. The photocatalytic measurement shows that the modified photocatalysts exhibit much higher activities, in which the ammonia production rates can reach above 232 µmol·g cal -1 ·h −1 under the light irradiation. The improved catalytic properties can be credited to the significantly increased number of photoinduced oxygen vacancies, the excellent visible-light adsorption abilities and photogenerated electron-hole separation efficiencies for the carbon dots bridged heterostructures. More hydroxyl and superoxide radicals can be simultaneously produced in the composites. This work provides reasonable guidance for applications in photocatalytic ammonia synthesis and a promising construction strategy of efficient Z-scheme photocatalysts.
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Nano Research
·
2022
·Vol. 16
·期 6
·8405-8410
·
IF 10.269
Cao Renfei,Cui Yangfeng,Huang Gang,Liu Wanqiang,Liu Jianwei,Zhang Xinbo
Li-O 2 batteries with extremely high specific energy density have been regarded as a kind of promising successor to current Li-ion batteries. However, the high charge overpotential for the decomposition of Li 2 O 2 discharge product reduces the energy efficiency and triggers a series of side reactions that cause the Li-O 2 batteries to have a limited lifetime. Herein, Co-doped C 3 N 4 (Co-C 3 N 4 ) photocatalysts were designed by an in situ thermal evaporation method to take advantage of the photo-assisted charging technology to conquer the shortcomings of Li-O 2 batteries encountered in the charge process. Different from the commonly used photocatalysts, the Co-C 3 N 4 photocatalysts perform well no matter with and without illumination, owing to the Co doping induced conductivity and electrocatalytic ability enhancement. This makes the Co-C 3 N 4 reduce the charge and discharge overpotentials and improve the cycling performance of Li-O 2 batteries (from 20 to 106 cycles) without illumination. While introducing illumination, the performance can be further improved: Charge voltage reduces to 3.3 V, and the energy efficiency increases to 84.84%, indicating that the Co-C 3 N 4 could behave as a suitable photocathode for Li-O 2 batteries. Besides, the low charge voltage and the continuous illumination together weaken the corrosion of the Li anode, making the long-term high-efficiency operation of Li-O 2 batteries no longer just extravagant hope.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Qijing Zheng,Chunyan Guan,Zhenghuan Wan,Ru Fu,Jinyu Yang
Pure phase orthorhombic Er 3+ and Yb 3+ co-doped La 14 W 8 O 45 up-conversion luminescent materials were successfully prepared by the hydrothermal method combined with calcination treatment. The structures, morphology, and optical properties of the samples were analyzed by X-ray powder diffractometer (XRD), scanning electron microscope (SEM), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), and up-conversion photoluminescence spectroscopy (UPL) with a 980 nm laser. XRD results indicated that the obtained samples are single-phase orthorhombic Er 3+ and Yb 3+ co-doped La 14 W 8 O 45 crystals. SEM results showed that the prepared sample exhibits an irregular and melted polyhedral-like morphology with agglomeration in submicron size of particles approximately 50–200 nm. UV–vis DRS results revealed that the La 14 W 8 O 45 crystal is a direct semiconductor with an optical band gap of 3.84 eV. The prepared Er 3+ and Yb 3+ co-doped La 14 W 8 O 45 crystals exhibit strong up-conversion emission peaks at about 526 nm, 548 nm, and 660 nm under 980 nm laser excitation. The intensity of up-conversion luminescence is affected by the Er 3+ doping concentration, and concentration quenching will be observed due to the cross-relaxation (CR) process when the Er 3+ doping content is above 1%. The pumping power dependence of the luminescence indicated that the up-conversion emissions of samples are excited by a two-photon absorption process. The color coordinates of the samples are located in the green light region.
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SOLID STATE SCIENCES
·
2023
·
IF 3.5
Yijun Yin,Xiaoyi Huang,Wang Wang,Xia Liu
Carbon and oxygen co-doped phosphotungstate were successfully prepared by one-pot thermal treatment with phosphotungstic acid (HPW) and melamine-cyanuric acid supramolecule (MCA) as precursors. Based on the results of X-ray photoelectron spectra (XPS), UV–visible diffuse reflectance spectroscopy (UV–vis DRS), and Photoluminescence (PL) measurements, the existence of C O in CNPW-8-420 has been confirmed. Carbon and oxygen which are co-doped as C O in the Keggin structure of phosphotungstate are contributed to the separation of charge carriers and can increase the amount of the photocatalysis active sites. With the amount of HPW increasing, MCA decomposed in CNPW-8-420 and CNPW-20-420 without synthesizing g-C 3 N 4 , leading to in-situ doped of C O. Furthermore, the increase of treatment temperature can cause the supramolecular structure of MCA to overbreak, leading to carbon and nitrogen elements doped in CNPW-8-500. The photocatalytic degradation efficiency rate constant of CNPW-8-420 is 0.40 h −1 and it can be reused 3 times with no obvious change. LC−MS/MS revealed the most likely photocatalytic degradation pathway and intermediates of imidacloprid including imidacloprid olefin, guanidine-type imidacloprid, imidacloprid urea, 6-chloronicotinic acid, 5-hydroxy-imidacloprid, and 4,5-dihydroxy-imidacloprid. This study provides a promising strategy for the construction of co-doped POMs photocatalysts using different supramolecule precursors.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2023
·
IF 1.2
Xiaoxiao LU,Jingchan ZHAO
The biochar (FS-PNBC) is prepared by pyrolyzing mixed biomass of fish scale and pine needle in varied proportions in a tube furnace. The biochar was characterized by a specific Brunauer-Emmett-Teller (BET) surface area analyzer, scanning electron microscope (SEM), Fourier infrared spectrometer (FTIR), and X-ray diffractometer (XRD). In a solution with an initial concentration of 60 mg/L, the adsorption of ciprofloxacin (CIP) by a 1:1 ratio of fish scale and pine needle co-pyrolyzed biochar (FS-PNBC1) reached 27.97 mg/g. The adsorption properties such as thermodynamics, kinetics, isothermal adsorption, and adsorption factors were investigated by batch experiments. The results indicate that FS-PNBC exhibits a significantly large specific surface area, abundant pore structure, and a high level of porosity. After approximately 180 min, adsorption equilibration was achieved in a pH=4 solution. The kinetic data was well-matched with a quasi-second-order model, suggesting that chemisorption plays a role in the adsorption process. Isothermal adsorption and thermodynamic results indicate that the adsorption of CIP by biochar is more consistent with the Freundlich model, which suggests multilayered non-homogeneous phase adsorption and an exothermic entropy-increasing reaction capable of proceeding spontaneously. FS-PNBC contains oxygen-containing functional groups, and through FTIR analysis, it was observed that hydrogen bonding, π-π bonding, and electrostatic interaction are closely linked to adsorption. This study demonstrates that biochar produced through the co-pyrolysis of fish scale and pine needle has the potential to serve as an efficacious adsorbent for extracting ciprofloxacin from wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yan An,Xiaoping Hu,Xinyu Wang,Jian Tian
Solar energy conversion into hydrogen (H 2 ) energy has attracted much attention. However, the low light utilization rate and fast carrier recombination of photocatalysts extremely limit the practical application of photocatalytic H 2 production. In this paper, MoSe 2 -NiSe with abundant active sites and interfacial electronic structures as dual co-catalysts were assembled on g-C 3 N 4 nanosheets (NSs) vis a solvothermal reaction process. MoSe 2 -NiSe/g-C 3 N 4 NSs composite exhibited improved light absorption and photoelectrochemical properties. The photocatalytic H 2 production rate of MoSe 2 -NiSe/g-C 3 N 4 composite achieved 2379.04 μmol·h −1 ·g −1 , which is 99.25, 1.44, and 3.67 times those of pure g-C 3 N 4 nanosheets (23.97 μmol·h −1 ·g −1 ), MoSe 2 /C 3 N 4 (1654.57 μmol·h −1 ·g −1 ), and NiSe/C 3 N 4 (649.08 μmol·h −1 ·g −1 ), respectively. The apparent quantum efficiency (AQE) value of MoSe 2 -NiSe/g-C 3 N 4 achieved 4.07 % under light at λ = 370 nm. The corresponding characterization and experiments proved that 2D ultrathin g-C 3 N 4 NSs with a large surface area and short charge-transfer distance could facilitate light scattering and the transport of photoexcited electrons. MoSe 2 -NiSe, as a dual co-catalyst, showed strong electronic synergistic interaction between the interfaces, thus improving the conductivity and promoting the electron transfer process.
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