NEURON
·
2023
·
IF 16.2
Jianzhi Zeng,Xuelin Li,Renzimo Zhang,Mingyue Lv,Yipan Wang,Ke Tan,Xiju Xia,Jinxia Wan,Miao Jing,Xiuning Zhang,Yu Li,Yang Yang,Liang Wang,Jun Chu,Yan Li,Yulong Li
Summary The coincidence between conditioned stimulus (CS) and unconditioned stimulus (US) is essential for associative learning; however, the mechanism regulating the duration of this temporal window remains unclear. Here, we found that serotonin (5-HT) bi-directionally regulates the coincidence time window of olfactory learning in Drosophila and affects synaptic plasticity of Kenyon cells (KCs) in the mushroom body (MB). Utilizing GPCR-activation-based (GRAB) neurotransmitter sensors, we found that KC-released acetylcholine (ACh) activates a serotonergic dorsal paired medial (DPM) neuron, which in turn provides inhibitory feedback to KCs. Physiological stimuli induce spatially heterogeneous 5-HT signals, which proportionally gate the intrinsic coincidence time windows of different MB compartments. Artificially reducing or increasing the DPM neuron-released 5-HT shortens or prolongs the coincidence window, respectively. In a sequential trace conditioning paradigm, this serotonergic neuromodulation helps to bridge the CS-US temporal gap. Altogether, we report a model circuitry for perceiving the temporal coincidence and determining the causal relationship between environmental events.
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Nanoscale
·
2023
·Vol. 15
·期 8
·4071-4079
·
IF 6.7
Heen Li,Xiaoyue Xu,Xiaohu Lin,Jianmin Chen,Kunling Zhu,Fei Peng,Faming Gao
The sluggish breakage of the N–N triple bond, as well as the existence of a competing hydrogen evolution reaction (HER), restricts the nitrogen reduction reaction process. Modification of the catalyst surface to boost N2 adsorption and activation is essential for nitrogen fixation. Herein, we introduced surface oxygen vacancies in bimetal oxide NiMnO3 by pyrolysis at 450 °C (450-NiMnO3) to achieve remarkable NRR activity. The NiMnO3 3D nanosphere with a rough surface could increase catalytically active metal sites and introduce oxygen vacancies that are able to enhance N2 adsorption and further improve the reaction rate. Benefiting from the introduced oxygen vacancies in NiMnO3, 450-NiMnO3 showed excellent performance for nitrogen reduction to ammonia with a high NH3 yield of 31.44 μg h−1 mgcat−1 (at −0.3 V vs. RHE) and a splendid FE of 14.5% (at −0.1 V vs. RHE) in 0.1 M KOH. 450-NiMnO3 also shows high long-term electrochemical stability with excellent selectivity for NH3 formation. 15N isotope labeling experiments further verify that the source of produced ammonia is derived from 450-NiMnO3. The present study opens new avenues for the rational construction of efficient electrocatalysts for the synthesis of ammonia from nitrogen.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 32
·12114-12124
·
IF 4.569
Mangmang Shi,Mingshu Zhao,Qingyang Zheng,Lidong Jiao,Zhou Su,Min Li,Xiaobo Zhao,Xiaoping Song,Sen Yang
Aqueous alkaline batteries (AABs) with the merits of both high energy density and power density have emerged as one of the most promising candidates for the new generation of energy storage devices, while their practical applications are still limited by the lack of high-performance electrode materials, especially for the anode materials. Herein, metallic bismuth–bismuth oxide nanoparticles (Bi–Bi2O3), with numerous heterogeneous interfaces, are successfully anchored and uniformly distributed on reduced graphene oxide (rGO) sheets. When Bi–Bi2O3/rGO-20 electrode is used as the anode material for an AAB, it shows a high specific capacity of 288.0 mA h g−1 (1036.9 F g−1) at 1 A g−1 and good rate capability (74.7% of capacity retention ratio at 20 A g−1). Additionally, in order to match well with a Bi–Bi2O3/rGO-20 anode, CoVSx thin sheets decorated with Ni–Co layered double hydroxide sheets (NiCo-LDH) were successfully constructed via a facile multistep hydrothermal method and a subsequent electrodeposition process. The resulting cathode exhibits a high specific capacity of 306.0 mA h g−1 (2448 F g−1) at 1 A g−1. The assembled CoVSx@NiCo-LDH//Bi–Bi2O3/rGO-20 AAB delivers an outstanding energy density of 106.1 Wh kg−1 at a power density of 789.6 W kg−1. Besides, the as-synthesized Bi-based electrode is also used in aqueous Zn alkaline batteries to further extend its application and the assembled Bi–Bi2O3/rGO-20//Zn batteries possess an ultralong flat discharge plateau and exhibit a specific capacity of 250.6 mA h g−1 at 1 A g−1. The results demonstrate that the as-assembled AAB has huge potential for practical applications and provides an inspiration for the next-generation energy storage devices.
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Journal of Nanomaterials
·
2021
·
IF 2.986
Chunbei Wu,Chuxin Zhou,Yuanyuan Chen,Zhigang Peng,Jun Yang,Yuanming Zhang
A Bi-BiOBr/BiPO4 heterojunction structure was successfully synthesized via a two-step solvothermal method with ethylene glycol as a reducer. Little BiPO4 irregular polyhedrons and little metal Bi spherical nanoparticles were uniformly dispersed on the surface of BiOBr nanosheets with intimate contact and formed a heterojunction structure between BiPO4 and BiOBr. It was found that Bi-BiOBr/BiPO4 had a significant improvement in photocatalytic performance for RhB degradation compared to bare BiOBr and BiPO4. The photocatalytic degradation rate constant of 0.2-Bi/BiOBr/BiPO4 was 1.44 h-1, which was 3.8 times and 14.2 times more than that of bare BiOBr and BiPO4, respectively. This is attributed to the formation of a ternary heterojunction, which benefits the separation of photogenerated electron-hole pairs. Furthermore, with the introduction of metal Bi, the SPR effect of metal Bi can effectively improve the absorption ability of Bi-BiOBr/BiPO4 photocatalyst, resulting in enhanced photoactivity. In this work, the mechanism of photocatalytic degradation was studied by using the photochemical technique and the capture experiment of active species, and it was revealed that h+ and ⋅O2- played a major role in the photocatalytic process.
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Nanoscale
·
2021
·Vol. 13
·期 47
·20281-20288
·
IF 7.79
Xintong Li,Yizhe Liu,Qidi Sun,Wei-Hsiang Huang,Zilong Wang,Chu-Chen Chueh,Chi-Liang Chen,Zonglong Zhu
In the electrochemical water splitting process, integrating hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte with the same catalyst is highly beneficial for increasing the energy efficiency and reducing the fabrication cost. However, most OER catalysts are unstable in the acidic solution, while HER shows poor kinetics in the alkaline solution, which hinders the scale-up application of electro-catalytic water splitting. In this work, a CoP/Co3O4 heterostructure is firstly fabricated and then O and P defects are introduced via surface engineering (s-CoP/Co3O4). The as-prepared material was employed as the catalyst towards electrochemical water splitting in an alkaline environment. In alkaline HER, a current density of −10 mA cm−2 can be achieved at an overpotential of 106 mV vs. RHE. In the OER process, the overpotential of s-CoP/Co3O4 electrode is only 211 mV vs. RHE at 10 mA cm−2 in 1 M KOH, and the corresponding Tafel slope is only 58.4 mV dec−1 so that the s-CoP/Co3O4 electrode could be used as the bifunctional catalyst for alkaline water splitting. This work provides a simple and low-cost approach to fabricate a Co-based heterojunction electrode with unsaturated metal sites to improve the electro-catalytic activities towards water splitting.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yucheng Chen,Lichun Cheng,Tianrui Xia,Man Wang,Huaiying Zhou,Qingrong Yao,Yuhang Zhai
Bi x Ba 1- x Fe 12 O 19 (Bi–BFO, x = 0, 0.1, 0.2, 0.3, 0.4) absorbing materials were successfully prepared employing the sol-gel method. In this study, the effects of Bi introduction on the phase structure, microstructure, magnetic properties , and wave absorption properties of the materials were investigated in detail. The introduction of Bi enhances the dielectric properties and electrical conductivity of the material, which improves charge and dipole polarization. Elemental doping changes the microstructure of the sample, which leads to interface and defect polarization and improves the wave absorption performance of the material. At the same time, Bi doping allows for the calcination temperature to be lowered and increases the density of the material, which renders the material amenable to low-temperature preparation. The absorbing material has a variety of loss forms, with the maximum reflection loss being −43.6 dB when the thickness is 2.4 mm, and the reflection peak shifts to lower frequencies with increasing Bi content. The effective absorption bandwidth (RL < −10 dB) is 6.3 GHz in the range of 9–15.3 GHz. Compared with multi-element doping and multi-component composites, the preparation method of the absorbing material is simple and facile. Compared with the existing ferrite materials, this material has broader applicability in various fields as it can absorb a wider bandwidth.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2020
·Vol. 104
·期 23
·10005-10018
·
IF 3.53
Guo Xiaolei,Wu Weibin,Zhang Mingliang,Wu Licheng,Huang Jianzhong
Abstract l -Tyrosine is a versatile compound used in the fine chemical, pharmaceutical, and functional food industries. Here, we report a bi-enzymatic cascade involving alanine racemase (ALR) and d -amino acid oxidase (DAAO) to produce pyruvate, as co-substrate for l -tyrosine production, from the cheap substrate l -alanine. The BpALR (ALR from Bacillus pseudofirmus ) was used as a whole-cell biocatalyst, converting l -alanine to d , l -alanine. The FsDAAO (DAAO from Fusarium solani ) was immobilized to oxidize the d -alanine generated in the first step to pyruvate. Both systems were combined as a continuous-flow reactor for maximized l -alanine-to-pyruvate conversion rates. The optimal parameters and appropriate conditions for FsDAAO immobilization were investigated. The pyruvate concentration of 86.6 g/L was achieved within 17 h. Subsequently, a whole-cell biocatalyst system for l -tyrosine production, catalyzed by the tyrosine phenol-lyase (TPL) from Erwinia herbicola (EhTPL), was developed, and a fed-batch approach was applied with phenol and the pyruvate produced with the ALR/DAAO system mentioned above. The concentration of phenol and pyruvate in the reactor should not exceed 7.5 g/L and 10 g/L, respectively. Significantly, the l -tyrosine concentration of 152.5 g/L was achieved within 10 h, demonstrating the great potential for high-efficiency production of l -tyrosine through the approach we established in this paper. Graphical abstract Key points • A specific bioreactor system for pyruvate produced from l -alanine was developed • The appropriate condition for immobilization of FsDAAO was investigated • A fed-batch process was established to produce l -tyrosine with recombinant E. coli • The bi-enzymatic cascade was successfully used for l -tyrosine production at low cost
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Ankang Xiao,Xiansong Shi,Zhe Zhang,Congcong Yin,Sen Xiong,Yong Wang
Processing two-dimensional (2D) covalent organic frameworks (COFs) into nanofilms has gained widespread attention in water treatment. However, the designed synthesis of COF-based membranes for ion separations still remains a huge challenge though the strategies to produce COF molecular separation membranes have been greatly developed. Herein, we report the construction of bi-layered COF nanofilms for efficient desalination through a simple yet effective secondary growth. The suggested strategy is capable of easily regulating the growth of another COF layer on the pre-synthesized first layer, thus producing crystalline and defect-free bi-layered COF nanofilms with distinct laminated structures. Most importantly, the offset channels are involved at the interface of two nanofilms obtained from the first and secondary growth, which leads to a constricted effective aperture that significantly enhances the ion separation performance. Specifically, the bi-layered COF nanofilms composited with macroporous supports exhibit high rejection rates (~95.8%) to Na 2 SO 4 , observably surpassing the desalination performance of single-layered COF nanofilms (rejection<10%). This work not only develops an ingenious way to fabricate COF-on-COF nanofilms with narrowed channels by tailoring the laminated structure of 2D COFs at the film interface, but also starts an avenue for the adoption of COF platforms for membrane separations with an improved precision.
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CHEMOSPHERE
·
2020
·
IF 5.778
Xiaotong Gu,Ning Qin,Guangfeng Wei,Yiqiong Hu,Ya-nan Zhang,Guohua Zhao
It is stubborn to remove the lowly concentrated phthalic acid esters (PAEs) that usually coexist with other highly concentrated but low-toxic pollutants in municipal sewage. Herein, we report a novel strategy for completely removing the PAEs over a bi-functional {001}TiO 2 surface (with highly exposed {001} facet), which not only serve as functional sites to specifically adsorb the target PAEs pollutants, but also contribute to an enhanced oxidation ability. The adsorption behavior of PAEs on {001}TiO 2 is analyzed deeply through kinetic experiments combining with in situ ATR-FTIR spectroscopy and theoretical calculations. The results reveal that the adsorption capacities of PAEs on {001}TiO 2 are about 4–5 times higher than that on TiO 2 , both of which follow the pseudo-second-order and Langmuir model. This is mainly attributed to the interfacial Lewis Acid-Base Pair between {001} facet Ti 5c sites and C O of PAEs. Benefitting from the specific adsorption capability toward target pollutant and enhanced oxidation ability of {001} facets, nearly 100% of DMP or DEP in simulated wastewater can be eliminated by {001}TiO 2 within 2 h illumination, and the relevant degradation rate constants ( k ) (3.67 h −1 for DMP and 2.19 h −1 for DEP) are 5.73 and 3.08 folds higher than that of pure TiO 2 , respectively. In the application of municipal wastewater , nearly 76% of DMP and 85% DEP can be eliminated by {001}TiO 2 within 2 h illumination, which are nearly 3–6 fold higher than that of pure TiO 2 .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yan Xu,Zhenbo Wang,Caifeng Ding,Xiliang Luo
It is a great challenge to detect the target selectively and accurately in complex biological samples. A ratiometric signal amplification strategy based on antifouling peptide is proposed to detect thrombin (TB) in this work. The electrode is modified with conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) and [email protected] Then the bi-functional peptide anchors to the modified electrode and captures the low toxic electrochemiluminescence (ECL) probe. The bi-functional peptide includes a new antifouling sequence (DRDRDRDR) and a TB recognizable sequence (SGRPVLG), while the former can greatly reduce the non-specific adsorption in complex samples and the latter can be cleaved by TB. The new self-enhanced luminescence probe labeled as PAMAM-QDs is composed of low toxic and water-soluble CuInZnS/ZnS quantum dots (CIZS/ZnS QDs) and polyamidoamine (PAMAM) via amide bonds. Concentration of TB can be obtained via the ratio of the signals of ECL QDs /ECL [email protected] accurately and sensitively. The ECL biosensor with the detection line 1.82 fM can work from 10 fM to 1 nM. Thanks to the antifouling property of the designed peptide and the amplification of the new ECL probe, the biosensor can be used for quantifying TB in practical complex samples with high selectivity and sensitivity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Wanjie Xu,Yuanzhi Chen,Liubin Shi,Laisen Wang,Dong-Liang Peng
Binary superparticles formed by self-assembling two different types of nanoparticles may utilize the synergistic interactions and create advanced multifunctional materials. Bi-magnetic superparticles with a core–shell structure have unique properties due to their specific spatial configurations. Herein, we built Mn 3 O 4 @Ni core–shell binary superparticles via an emulsion self-assembly technique. The superparticles are generated with a spherical morphology, and have a typical average size of about 240 nm. By altering the ratio of the two magnetic nanoparticles , the thickness of Ni shells can be adjusted. Oleic acid ligands are crucial for the formation of core–shell structure. Magnetic analysis suggests that core–shell superparticles display dual-phase magnetic interactions, contrasting with the single-phase magnetic behaviors of commonly core–shell magnetic nanoparticles . The calculation on the effective magnetic anisotropy constants indicates that the presence of Ni shell layers reduces the dipole interactions among the Mn 3 O 4 core particles. Due to the presence of Ni nanoparticle shells, the blocking temperature of Mn 3 O 4 is reduced, while the Curie temperature of Mn 3 O 4 is independent on Ni content. Tunable magnetic properties can be achieved by modulating the Ni nanoparticle shell thickness. This study offers insights for the development of core–shell superparticles with varied magnetic characteristics.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Meng Xu,Zhiyou Tan,Yilong Tian,Feng Gong,Kebing Yi,Zhike He,Xinghu Ji
Developing anode materials significantly enhances the desalination performance of hybrid capacitive deionization (HCDI). Bismuth exhibits high selectivity for chloride ion removal. However, the sluggish kinetics and poor cycling stability of bismuth present considerable challenges for its application in high-capacitance deionization. In this study, we successfully prepared a binder-free Bi@MXene film electrode for chloride storage by employing an electrostatic self-assembly strategy to anchor Bi nanospheres into MXene layers. The bismuth nanospheres, as the pillars of MXene network, improve the self-stacking problem of Ti 3 C 2 T X layers. And MXene layers effectively mitigate the volume expansion of bismuth nanospheres through the spatial confinement effect. Benefiting from three-dimentional sandwich structure of Bi@MXene film, the HCDI system exhibits outstanding salt adsorption capacity (113.4 mg·g −1 ), excellent adsorption rate (4.2 mg·g −1 ·min −1 ) and a good desalination capacity retention of 84.6 % following 50 cycles at 100 mA·g −1 . The development of this composite material provides insights for the design of efficient and stable chloride storage electrodes.
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