Nano Energy
·
2021
·
IF 17.881
Dongdong Li,Qian Zhang,Zhichuan Shen,Kumar Siddharth,Lijuan Chen,Minhua Shao,Zhicong Shi
Rechargeable lithium oxygen batteries (LOBs) are one of the most promising energy storage systems by virtue of their high energy density and environmental amiability. However, the development of LOBs is still hindered by some critical issues. Herein, 3D hexapod-shaped Co-ZIFs-thiourea/dimethyl sulfoxide (H-Co-ZIFs-S) derived Co nanoparticles embedded into nitrogen and sulfur co-doped carbon (H-Co-NSC) are developed, and then low content of ruthenium nanoparticles are decorated on the surface to obtain Ru/H-Co-NSC as efficient catalyst for LOBs. The Ru/H-Co-NSC catalysts exhibits unique structure and catalytic properties , such as accommodating the insoluble discharge product Li 2 O 2 , promoting the transportation of ions/O 2, enhancing the electronic conduction, demonstrating excellent OER/ORR kinetics as well. In addition, the Ru-decorated nanoparticles could effectively suppress some side-reactions caused by the exposed carbon of H-Co-NSC in LOBs. First-principles Density functional theory (DFT) calculations reveal the cooperative effect of multiple active sites in Ru/H-Co-NSC can effectively promote the ORR/OER kinetics in LOBs. Therefore, the LOBs with Ru/H-Co-NSC cathode provide a positive catalytic capacity with low overpotential, large specific capacities, long cycle life and superior reversibility . Our work may pave the way to design more advanced catalysts for metal-air batteries with superior electrochemical performance.
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Nanoscale Advances
·
2020
·Vol. 2
·期 4
·1483-1492
·
IF 0
Honggang Yin,Die Gao,Yan Qiu,Gaoyi Yi,Jun Li,Yingying Dong,Kailian Zhang,Zhining Xia,Qifeng Fu
In recent years, photoluminescent (PL) carbon dots (CDs) have attracted enormous attention because of their many fascinating properties. However, the traditional synthesis routes of PL CDs usually suffer from relatively low quantum yields (QYs) and require complicated operation processes as well as lots of externally supplied energy. Herein, we report a room temperature, green, ultrafast and energy-efficient route for large scale synthesis of highly PL N, S-codoped CDs without any external energy supply. The N, S-codoped CDs are prepared through a novel carbon source self-heating strategy, using the sole precursor tetraethylenepentamine (TEPA) simultaneously as the carbon, nitrogen and heat source, triggered by the heat initiator sodium persulfate (Na2S2O8). The large amount of heat released from Na2S2O8-triggered oxidation of TEPA could effectively promote the spontaneous polymerization and carbonization of TEPA precursors themselves as well as the in situ co-doping of sulfur, which had marked synergistic effects on the fluorescence enhancement of CDs, eventually leading to the high-yield (58.0%) preparation of highly fluorescent N, S-codoped CDs (QY 26.4%) at room temperature within 2 min. Moreover, the fluorescence of N, S-codoped CDs could be selectively quenched by Fe3+ ions in the presence of EDTA, in an ultra-wide range of 0.2–600 μM, with a detection limit of 0.10 μM. Ultimately, the fluorescent nanoprobe was successfully used for the quantitative detection of Fe3+ in human serum samples, indicating its great potential for sensing and biomedical applications.
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POLYMER
·
2024
·
IF 4.1
Yanxu Tian,Jiangang Zhang,Wen Cao,Xiong Liu,Xianming Zhang,Wenxing Chen,Jianna Bao
Poly(lactic acid) (PLA), which is recognized as a potential biodegradable material, brings serious fire concern because of its flammability with heavily molten drips. In this investigation, a bio-based flame retardant named CS@ATMP@MI (CAM) consisting of chitosan (CS), amino trimethylene phosphonic acid (ATMP), and methionine (MI) was developed through a simple and environmental-friendly synthesis approach. CAM provided effective flame retardancy and anti-dripping ability without compromising mechanical properties. PLA/CAM composites achieved a UL-94 V-0 rating with 1.0 wt% CAM and a limited oxygen index value of 28.4 % with 3.0 wt% CAM. The high efficiency is due to the high phosphate content in ATMP and the strong coordination between CS, ATMP, and MI. The cone calorimetry tests showed that adding 2.0 wt% CAM increased the total smoke production from 0.2 to 0.6 m 2 , and thermogravimetric analysis/infrared spectrum analysis indicated that combustible gas production was reduced over 50 % with 3.0 wt% CAM, demonstrating that phosphorus-nitrogen synergy in CAM could effectively capture free radicals and released inert gases. Char analysis showed that the PLA/CAM composites could form a thicker and denser char layer during combustion due to phosphorus-sulfur synergy, which promoted char formation to shield mass transfer. PLA/CAM composites maintained excellent mechanical performance, with a 3.0 wt% CAM increasing tensile strength from 53.9 to 57.3 MPa and Young's modulus from 1782 to 2262 MPa. This study presented a sustainable method for synthesizing an effective bio-based flame retardant and a strategy for producing eco-friendly, fire-resistant PLA composites for industrial applications.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Zihan Tian,Yumei Xu,Qingyu Liu,Xiao Wu,Shuhao Qin,Jing Zhang,Hong Wang,Jianxin Li,Zhenyu Cui
The ridge-like PVDF/CQDs-TiO 2 @CQDs hybrid piezo-photocatalytic film was fabricated via an " in situ hydrothermal-vapor induction" method, in which the S-scheme TiO 2 @CQDs heterostructures were grown in situ and uniformly immobilization onto the polyvinylidene fluoride (PVDF) film surface through Ti-F coordination bonds. The effects of hybrid film morphology, carbon quantum dots (CQDs) doping, and flow rate on piezo-photocatalytic degradation performance were investigated. The ridge-like microstructure increased the exposure of adsorption and catalytic active sites. The film reactor driven by the flow of dye solution and light illumination promoted the adsorption of pollutants while establishing a dual built-in electric field (IEF) between the piezoelectric PVDF and catalysts, TiO 2 and CQDs, which accelerated photogenerated charge transfer and separation. Finally, a dynamic piezo-photocatalytic process was realized for the efficient and synergistic degradation of RhB. The reaction rate constant ( ks ) of the dynamic piezo-photocatalytic degradation was about 2.3 times that of the static photocatalytic process. Structural optimization and density functional theory (DFT) calculations of Rhodamine B (RhB) molecules were performed using Gaussian software. The degradation products, degradation pathways, and degradation mechanisms of RhB were thoroughly studied by combining the results of total organic carbon (TOC), DFT and liquid chromatography mass spectrometry (LC-MS).
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CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Pengkun Zhang,Qinhan Wu,Haoyu Wang,Dong-Hau Kuo,Yujie Lai,Dongfang Lu,Jiqing Li,Jinguo Lin,Zhanhui Yuan,Xiaoyun Chen
Herein, we established a Zn 3 (OH) 2 (V 2 O 7 )(H 2 O) 2 /V-Zn(O,S) Z-scheme heterojunction (labeled ZnVO/V-Zn(O,S) with a heterovalent V 4+ /V 5+ states and oxygen vacancies in both phases via a one-step in-situ hydrolysis method. The NaBH 4 regulated the ZnVO/V-Zn(O,S)-3 with rich Vo and suitable n (V 4+ )/ n (V 5+ ) ratio achieved an excellent photocatalytic nitrogen fixation activity of 301.7 μmol/(g·h) and apparent quantum efficiency of 1.148% at 420 nm without any sacrificial agent, which is 11 times than that of V-Zn(O,S). The Vo acts as the active site to trap and activate N 2 molecules and to trap and activate H 2 O to produce the H for N 2 molecules photocatalytic reduction. The rich Vo defects can also reduce the competitive adsorption of H 2 O and N 2 molecules on the surface active site of the catalyst. The heterovalent vanadium states act as the photogenerated electrons, quickly hopping between V 4+ and V 5+ to transfer for the photocatalytic N 2 reduction reaction. Additionally, the Z-scheme heterojunction effectively minimizes photogenerated carrier recombination. These synergistic effects collectively boost the photocatalytic nitrogen fixation activity. This study provides a practical method for designing Z-scheme heterojunctions for efficient photocatalytic N 2 fixation under mild conditions.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 47
·26086-26104
·
IF 11.9
Lijun Chen,Feihong Wang,Jiahao Zhang,Hongyuan Wei,Leping Dang
This work presents a referential case in which the original efficient band structure of a binary composite remains intact when a third component is introduced. The spherical BiOBr (BOB) possesses good stability and a low valence band position, but its poor separation efficiency of photogenerated charge carriers limits its application. This limitation can be overcome by combining it with two-dimensional g-C3N4 nanosheets (CNs) in an appropriate proportion. The soft and lightweight texture of CNs ensures effective wrapping of BOB to form a tight integration. However, the limited visible light absorption of CNs/BOB hampers the overall catalytic effect. Black phosphorus nanosheets (BPs) exhibit outstanding light absorption over a wide range, and their incorporation into CNs/BOB can compensate for this deficiency. Additionally, new migration pathways can be formed to further enhance the spatial separation of photogenerated charge carriers. Furthermore, scavenging experiments and EPR tests confirmed that the presence of BPs did not alter the original S-scheme band structure between CNs and BOB, owing to proper band alignment and the effect of an internal electric field, allowing the useful photogenerated electrons and holes with strong redox ability to continue playing a pivotal role. As a result, 88.3% of tetracycline hydrochloride (TCH, 200 mL, 20 mg L−1) can be removed under visible light in 60 minutes using 50 mg of 6BPs/CNs/BOB1:2, with good reusability and adaptability to various pollutants. This work provides a valuable strategy for designing and preparing ternary composites with attractive photocatalytic performance driven by visible light.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Xiaojiao Du,Quan Wang,Tiantian Wang,Jiaxing Xu,Ding Jiang,Qianjun Wang,Bing Zhang
Undirected charge transfer and inhibited carrier separation significantly limit the photoelectrochemical (PEC) performance of the sensing element, thereby reducing the sensitivity of the PEC sensor. Herein, a novel self-powered PEC sensor was developed for ultrasensitive detection of microcystin-RR (MC-RR) using an S-scheme pyrene-based hydrogen-bonded organic framework (Py-HOF)/AgIn 5 S 8 heterojunction with dual signal amplification driven by oriented charge transfer and a photothermal self-enhancement effect. The well-aligned energy bands and matched Fermi levels between the two components of Py-HOF and AgIn 5 S 8 facilitated efficient and oriented separation of electron-hole pairs through the built-in electric field. Additionally, the intrinsic photothermal effect of AgIn 5 S 8 generated localized ‘hot islands’, which elevated the local temperature at the reaction interface, further accelerating charge migration and enhancing PEC performance. This synergistic mechanism of oriented charge transfer and the photothermal self-enhancement effect significantly augmented the photocurrent response by 8-fold, enabling ultrasensitive self-powered detection without external bias. Leveraging target-induced signal modulation of MC-RR aptamer, a novel self-powered PEC sensor was fabricated as a proof of concept. Under optimized conditions, the proposed sensor demonstrated a wide linear range (1 × 10 −14 M to 1 × 10 −9 M), an ultralow detection limit (1.5 × 10 −15 M), high specificity, good reproducibility, showing a satisfactory applicability in real water samples. This work demonstrates a synergistic design strategy integrating S-scheme charge transfer and photothermal effects, paving the way for the development of advanced self-powered sensors for monitoring trace-level pollutants in environmental systems.
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Small
·
2026
·
IF 11.8
Yue Liu,Xinyuan Wang,Xueyu Shi,Shaogui Wu
Nitrogen and sulfur co-doped carbon dots (N, S-CDs) were synthesized through a facile one-step hydrothermal approach that employed L-proline as the carbon precursor and methyl orange as the dopant. The as-prepared N, S-CDs exhibited robust cyan photoluminescence with a high quantum yield of 22.5%. Because of their superior optical properties, these N, S-CDs were developed as a sensitive fluorescent probe for the selective detection of chlortetracycline (CTC). The sensing mechanism was attributed to dynamic quenching, yielding a wide linear response from 0 to 25 µmol·L −1 ( R 2 = 0.998) and a low detection limit of 0.94 µmol·L −1 . The practical utility of this probe was validated in environmental water and milk samples, achieving satisfactory recoveries ranging from 83.67% to 94.46%. Additionally, multifunctional PVA@N, S-CDs composite films were fabricated by incorporating N, S-CDs into a polyvinyl alcohol (PVA) matrix via a solvent-casting method. These flexible and highly transparent films demonstrated exceptional UV protection, effectively shielding over 99.5% of UV-C and UV-B radiation while converting the absorbed energy into visible light through the down-conversion effect. Application trials using grapes as a food model confirmed that the composite films significantly mitigated UV-induced deterioration and moisture loss. Overall, this work presented a versatile carbon dot-based platform that integrates specific chemical sensing with efficient UV-shielding, providing a promising strategy for advanced applications in smart food packaging and environmental monitoring.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Yao Fan,Lu Shen,Yaqi Liu,Ying Hu,Wanjun Long,Haiyan Fu,Yuanbin She
A ratiometric fluorescent probe based on N/S doped carbon dots (N/S-CQDs) and mercaptoacetic acid capped CdTe quantum dots (TGA-CdTe QDs) with sensitized and self-calibration functions was constructed to sensitively detect multiple tetracycline antibiotics (TCs). N/S-CQDs could attach stably to TGA-CdTe QDs and form a new composite ratiometric fluorescent probe that had a more than tenfold increase in sensitivity to TCs compared with each single QD. The probe could detect four common TCs as the color of the probe changed from bright red to dark red, and the limit of detection (LOD) was 1.47 × 10 −2 –1.78 × 10 −2 mg/L. Practical applications of the probe in food and urine were also verified with recovery rates of 95.21%-104.97%. Due to the abundant spectral fingerprints provided by both QDs, this novel probe could accurately recognize not only different single TCs but also mixed TC samples even in actual samples combined with chemometrics.
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高影响因子
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
·
2023
·Vol. 73
·期 2
·005648
·
IF 2.8
Rashidin Abdugheni,Dan-Hua Li,Yu-Jing Wang,Meng-Xuan Du,Nan Zhou,Chang Liu,Shuang-Jiang Liu
The human gastrointestinal tract is inhabited by various microorganisms, including thousands of bacterial taxa that have yet to be cultured and characterized. In this report, we describe the isolation, cultivation, genotypic and phenotypic characterization and taxonomy of five novel anaerobic bacterial strains that were recovered during the massive cultivation and isolation of gut microbes from human faecal samples. On the basis of the polyphasic taxonomic results, we propose two novel genera and five novel species. They areAcidaminococcus hominissp. nov. (type strain NSJ-142T=CGMCC 1.17903T=KCTC 25346T),Amedibacillus hominissp. nov. (type strain NSJ-176T=CGMCC 1.17933T=KCTC 25355T),Lientehia hominisgen. nov. sp. nov. (type strain NSJ-141T=CGMCC 1.17902T=KCTC 25345T),Merdimmobilis hominisgen. nov. sp. nov. (type strain NSJ-153T=CGMCC 1.17915T=KCTC 25350T) andParaeggerthella hominissp. nov. (type strain NSJ-152T=CGMCC 1.17914T=KCTC 25349T).
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chen Li,Yaowen Zhang,Min Yuan,Yang Liu,Haikuo Lan,Zhenjiang Li,Kang Liu,Lei Wang
Regulating the atomic coordination ambiance of uniformly distributed single atoms (SAs) via heteroatom doping is an up-and-coming method to facilitate the catalytic activity for oxygen reduction reactions (ORR). With the cooperative interaction of dual heteroatom doping supplied extra degrees of freedom, a greater efficiency of ORR can be realized via a reduction in intermediate energy barrier during catalytic reactions. Here, we explore a fresh approach to generate N, S co-doped Fe-SA in embedded porous carbon nanosheets/carbon nanotubes (Fe-N X @NSCST-ZL) utilizing a 2D leaf-shaped MOF as a template in this work. Taking advantage of the combined effect of carbon matrix and nanotubes as well as the abundance of Fe-N X active sites and thiophene-S, the Fe-N X @NSCST-ZL provides exceptional performance for ORRs with a half-wave potential of 0.94 V at alkaline conditions, 0.77 V at acidic conditions, and 0.74 V at neutral conditions (V vs. RHE). Furthermore, Fe-N X @NSCST-ZL-based Zn-air battery, as well as quasi solid-state flexible battery, maintain steady operation for 765 h and 30 h with a small discharge/charge interval, respectively. This work contributes perspectives on the reasonable design of economical single-atom catalysts (SACs) for applications in energy conversion that have outstanding electrocatalytic potential.
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CHEMOSPHERE
·
2022
·
IF 8.943
Wenkai Liu,Bin Liu,Xin Li
The aim of this study was to investigate the feasibility and fouling mitigation mechanisms of UV/Fe(II) synergistically activated sulfite (S(IV)) (UFS) pretreatment to alleviate membrane fouling caused by HA-enhanced Ca 2+ scaling. After UFS treatment, hydrophobic substances and carboxyl groups structure were destroyed by the in-situ-generated SO•–4, resulted in a significant reduction of hydrophobic substances ratio and carboxyl group concentration. Due to the formation of more electropositive in-situ-generated Fe(III), the complexation between Ca 2+ and carboxyl groups was weakened so that the bulk crystallization size on the membrane surface was greatly reduced. The filter cake enhanced osmotic pressure effect (CEOP) and concentration polarization effect were hence alleviated, as well as the surface roughness . At the microcosmic perspective, as the energy barrier between the membrane and foulants was increased significantly after pretreatment, the anti -foulants adsorption ability of the membrane was enhanced. Correlation analysis showed that the carboxyl concentration and density, HPO ratio, larger particle size (>100 nm) ratio, the Ca 2+ concentration in the scaling layer and energy barrier all had a good correlation with the membrane resistance. This research not only provides an advanced oxidation technology that can effectively alleviate the synergistically-fouling effect of HA and Ca 2+ of nanofiltration process, but also proposes a guidance for the UV/Fe(II) synergistically activated sulfite.
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