MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 9
·1-9
·
IF 6.232
Wang Meng,Wang Jingjing,Wang Kangkang,Chen Tingxiang,Wang Jide
A novel magnetic porous carbon with a high specific surface and magnetization saturation, derived from a Zn/Co-MOF-5, was fabricated by direct carbonization of Zn/Co-MOF-5 without the need of additional carbon precursors under optimum pyrolysis temperature. The material was employed as an adsorbent for magnetic solid-phase extraction of four carbamates from water and tomato samples prior to high-performance liquid chromatography–tandem quadrupole mass spectrometry analysis. Under optimum conditions, the method displayed good linearity ( r > 0.9987) within the concentration range 0.05–20 ng mL −1 for water samples and 0.1–40 ng g −1 for tomato samples. The limits of detection (S/ N = 3) for the four carbamate pesticides were in the range 0.0006–0.013 ng mL −1 for water samples and 0.001–0.01 ng g −1 for tomato samples and satisfactory spiked recoveries in the range 86.1 to 109.1% were obtained with the relative standard deviation values from 2.1 to 14.0%.
Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 11
·7169-7177
·
IF 1.093
Qin Zhuozhuo,Liu Wenxia,Chen Huabin,Chen Jun,Li Zhenzhen
Developing full-spectrum photocatalysts that harvests solar light from ultraviolet to near-infrared light has aroused great interest in photodegradation of organic pollutants, due to the imminent energy crisis and growing pollution issues. Herein, we report an excellent full-spectrum
photocatalyst derived from calcination of an Mg/Zn/Al/Er-hydrotalcite-like compound. The photocatalyst is a stable multi-phase oxide consisting of various syntrophic Er3+-doped metal oxides with different particle sizes and morphology. Its ultraviolet (UV) photocatalytic activity
is maximized by increasing the fraction of Zn2+ and sustaining the pure hydrotalcite-like phase with an appropriate fraction of Mg2+ in preparing the Mg/Zn/Al/Er-hydrotalcite-like precursor. The visible and NIR photocatalytic activities are triggered by an indirect excitation
involving an up-conversion process. The major active species of the photocatalyst in the photodegradation of methyl orange are superoxide anions and photogenerated holes. Nevertheless, hydroxyl radicals also play a moderate role in the photodegradation process. This work finds a new way to
prepare full-spectrum photocatalysts with tunable chemical compositions via an environmentally friendly hydrotalcite-like precursor.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2019
·Vol. 9
·期 12
·867
·
IF 2.33
Diping Zeng,Zhiyi Liu,Song Bai,Jian Wang
In the present work, a coating was prepared on an Al alloy substrate by plasma electrolytic oxidation (PEO). To seal the micro defects in the oxide scale, a siloxane layer was prepared on the PEO coating by sol gel method. The polymer sealant was synthesized from Tetraethoxy silane (TEOS) and methacryloxy propyl trimethoxyl silane (MPTES). The chemical structure of the polymer was studied by Fourier transform infrared spectroscopy (FTIR). The morphologies and microstructure of the PEO coating and siloxane coating were investigated by scanning electron microscopy (SEM). The results showed that siloxane formed a continuous layer on the surface and effectively sealed the micro defects. The corrosion behavior of the coatings in three different corrosion solutions (NaCl, HCl, and NaOH) was examined by electrochemical impedance spectroscopy and potentiodynamic polarization. The corrosion resistance of the sealed coatings was superior to that of the PEO coating because it prevented the penetration of corrosive solutions. The corrosion resistance of the sealed coatings was found to decrease with increasing electrolyte concentration. The work demonstrated that siloxane sealing may greatly enhance the corrosion resistance of Al-based PEO coating in acidic, neutral, and alkaline environments.Keywords:PEO coating;silane polymer;sealing treatment;corrosion resistance
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Shan Yuan,Miaomiao Weng,Dajun Liu,Xingquan He,Li−Li Cui,Tewodros Asefa
Platinum (Pt)-based catalysts are widely used for the oxygen reduction reaction (ORR) in many energy conversion and storage devices, such as fuel cells and metal–air batteries. However, Pt is among the least earth abundant and most expensive elements; as a result, these energy devices are currently difficult to scale up. This has motivated researchers to try to develop sustainable and alternative catalysts that can replace Pt as well as other noble metal-based catalysts. Herein, novel Co nanocrystals-loaded, Zn, N, and S codoped carbon materials, dubbed (Co, Zn)/NSC, which have hollow spherical structures and which can serve as efficient ORR catalysts, are developed via a facile synthetic method involving microemulsion and pyrolysis. The key in the synthesis of these nonprecious metal-containing heteroatom-doped nanostructured carbon catalysts is the preparation of nanosized, mixed metal–organic frameworks (MOFs) in solution using microemulsion, and the exploitation of their morphology to produce hollow spherical structures via pyrolysis. Elemental mapping shows the presence of Co, Zn, N, and S atoms throughout the structures of the materials. The material obtained at pyrolysis temperature of 800 °C, denoted (Co, Zn)/NSC-800, exhibits excellent electrocatalytic activity for ORR in alkaline and acidic media, with onset potentials of 1.000 and 0.802 V vs RHE, respectively. In addition, the catalyst is stable and tolerates the methanol crossover reaction in both cases. Thus, this material has the potential to replace Pt catalysts in fuel cells. Moreover, the synthetic approach used to make it can be extended to produce other robust, nonprecious transition metal-based catalysts for ORR.
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Xinxin Shu,Song Chen,Si Chen,Wei Pan,Jintao Zhang
Exploration of cost-effective and highly durable carbon-based multifunctional electrocatalysts for energy conversion and storage devices (e.g., metal-air batteries) is of critical significance. Herein, we present a unique worm-like structure of hierarchically porous nitrogen-doped graphene (N-rGO) embedded with cobalt nitride (Co 5.47 N) nanoparticles (named as Co 5.47 N@N-rGO) by tannic acid assisted nitridation method for Zn-air batteries and overall water splitting. Benefiting from the unique worm-like structure to expose more active sites and the synergy advantages of a close contact between Co 5.47 N nanoparticles and the N-rGO sheets, the Co 5.47 N@N-rGO exhibits efficient bifunctional catalytic activities toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Notably, Zn-air batteries assembled with Co 5.47 N@N-rGO-750 show a power density of 120.7 mWcm −2 and excellent cycling stabilities for 330 h in an aqueous electrolyte. More interestingly, when assembled into a flexible solid-state rechargeable Zn-air battery, the Co 5.47 N@N-rGO-750 displays a specific capacity of 610 mAh g zn −1 and good cycling stability over 40 h. Moreover, the integrated device for water splitting powered by Zn-air batteries is also fabricated by using the Co 5.47 N@N-rGO-750 electrocatalyst, exhibiting a good gas generation rate. This work offers a new strategy to design and synthesize efficient multifunctional carbon-based electrocatalysts applied in electrochemical devices .
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Hongliang Xie,Peng Chu,Min-an Yang,Zehao Li,Changkun Cai,Yipeng Liu,Jie Wang,Zhaoming Fu,Zhansheng Lu,Zhihong Du,Hailei Zhao
Liquid metal battery (LMB) has recently captured intensive attention for large-scale energy storage, originating from its attractive cost-efficiency, robust cyclability, and ultralong service lifetime. Nevertheless, realizing high energy density remains a great challenge. Herein, a novel dual-active Sb-Zn electrode is elaborately designed. A unique lithiation mechanism is demonstrated for the first time in LMB field. A ternary intermetallic compound LiZnSb is preferentially formed with a high discharge plateau at ca. 1.1 V, which is followed by a conversion reaction to Li 3 Sb and Zn at around 0.8 V and then a consecutive dissolution reaction of lithium in molten Zn, significantly ameliorating the voltage and capacity properties. Meanwhile, part Zn melts regenerate and disperse among discharge product layer, constructing rapid electron/lithium percolating networks in-situ , which accelerates the electrode reaction kinetics. As a result, the Li||Sb-Zn battery exhibits high average discharge voltage of 0.763 V at 100 mA cm −2 and superior rate performance (0.596 V at 1000 mA cm −2 ). Outstanding energy and power densities (290.6 Wh kg −1 and 239.66 W kg −1 ) are achieved, remarkably surpassing most reported LMBs and even comparable to Na-S battery. This work showcases an innovative electrochemistry system, opening a new avenue for high-performance LMBs.
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2026
·
IF 5.3
Zhaoyu Meng
The conversion of CO 2 to CO using electrochemistry requires the use of earth abundant catalysts with high selectivity, rapid reaction rate, and durability. In this work, hierarchically porous Co–N–C catalysts were synthesized via co-pyrolysis of a bimetallic zeolitic imidazolate framework (Zn/Co) and the dicyandiamide (DCD) followed by acid etching. By systematically adjusting the pyrolysis temperature (800 °C–1,000 °C) and the Co feed ratio (5–20 mol%), volcano-type activity relationships are found, which are controlled by the interplay of the three factors graphitization, nitrogen retention, and the density of Co–N x sites. The optimized catalyst CoNC-900 achieves a Faradaic efficiency of CO of 94.9% ± 1.0% at −0.75 V vs. RHE in CO 2 -saturated 0.5 M KHCO 3 with a CO partial current density of 16.0 mA cm −2 , a lower bound turnover frequency of ≥0.33 s −1 and ≈11% current decay FE_CO retained above 92% over 24 h. The observed selectivity can be rationalized, as the density functional theory calculations indicate that the barrier of the rate-determining step, namely the formation of COOH is lowered on the Co–N 4 moiety (0.42 eV, whereas ≥1.79 eV on the metal-free nitrogen sites). A transferable design rule is developed for CO 2 electrolysis that relates bimetallic MOF precursor chemistry, hierarchical porosity, and M–N x site engineering.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Shuang Gao,Shaoqing Chen,Feng Shi,Wenwen Jiang,Jiafu Chen
Molybdenum disulfide (MoS 2 ), as a classical layered transition-metal dichalcogenide (TMD), shows great potential as an advanced Zn 2+ storage cathode of aqueous Zn-ion batteries (ZIBs) due to high theoretical capacity and two-dimensional Zn 2+ transport channels. However, the narrow interlayer distance and the poor electrical conduction of stable 2H-MoS 2 limit its applications. In this work, the 1T-MoS 2 sheets with good electrical conduction and large interlayer spacing of 9.5 Å (designated as MoS 2 -180) have been successfully prepared by a facile hydrothermal method . The interlaminar structural water induces stable existence of metastable 1T-MoS 2 and large space distance of 6.08 Å between layers (that is larger than the size (5.5 Å) of hydrated Zn 2+ ), and contributes to its excellent hydrophilicity , promoting transmission of hydrated Zn 2+ . The interlayer spacing-tailored MoS 2 -180 cathode exhibits high specific capacity (Cs) of 226.2 mAh g −1 at 0.10 A g −1 and impressive high-rate capability. The Cs at 5.00 A g −1 is extraordinarily up to 150.9 mAh g −1 and retains 66.7% of that at 0.10 A g −1 . This is far superior to the most reported MoS 2 , MoS 2 derivatives and MoS 2 /C composite cathodes. Moreover, the activated MoS 2 -180 cathode shows robust long-term cycling stability with Cs retention of 103.6% after 500 cycles at 1.00 A g −1 . The mechanism behind these phenomena brings new insights into the structural water-induced 1T-MoS 2 for high-performance aqueous ZIBs cathodes.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Dongyang Liu,Hanzhi Wang,Yue Teng,Qirui Wu,Chunming Tang,Xinxin Gao,Chaoqi Chen,Liandong Zhu
With the development of livestock industry , contaminants such as divalent zinc ions (Zn (Ⅱ)) and estrone are often simultaneously detected in livestock wastewater. Nevertheless, the combined toxicity of these two pollutants on microalgae is still unclear. Moreover, microalgae have the potential for biosorption and bioaccumulation of heavy metals and organic compounds. Thus, this study investigated the joint effects of Zn (Ⅱ) and estrone on microalgae Chlorella sorokiniana , in terms of growth, photosynthetic activity and biomolecules , as well as pollutants removal by algae. Interestingly, a low Zn (Ⅱ) concentration promoted C . sorokiniana growth and photosynthetic activity, while the high concentration experienced inhibition. As the increase of estrone concentration, chlorophyll a content increased continuously to resist the environmental stress. Concurrently, the secretion of extracellular polysaccharides and proteins by algae increased with exposure to Zn (Ⅱ) and estrone, reducing toxicity of pollutants to microalgae. Reactive oxygen species and superoxide dismutase activity increased as the increase of pollutant concentration after 96 h cultivation, but high pollutant concentrations resulted in damage of cells, as proved by increased MDA content. Additionally, C. sorokiniana displayed remarkable removal efficiency for Zn (Ⅱ) and estrone, reaching up to 86.14% and 84.96% respectively. The study provides insights into the biochemical responses of microalgae to pollutants and highlights the potential of microalgae in pollutants removal.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Qing Han,Mengqing Shi,Linkai Han,Di Liu,Mingwei Tong,Yuxin Xie,Zhonghua Xiang
Developing highly efficient bifunctional oxygen electrocatalysts is important but still remains a challenge for Zn-air flow battery. Metal-organic frameworks (MOFs) and covalent organic polymers (COPs) materials have emerged as promising alternatives to the benchmark precious metal electrocatalysts due to their designable and controllable structures at the atomic level. However, their catalytic performances are limited by the conductivity and catalytic activity using initial materials. Moreover, these materials are generally developed either as single oxygen reduction reaction (ORR) or oxygen evolution reaction (OER) electrocatalysts. Herein, we utilize the π-π stacking effect to directly assemble initial nanosheet FeNi-MOF and iron phthalocyanine rich COP hybrid materials toward the highly efficient bifunctional electrocatalysts via pyrolysis-free strategy. The carbon black is added to the composite as support to limit the stacking of composites and increase the conductivity. The obtained catalyst, named as NS FeNi @COP Fe -C, exhibits superior catalytic performance with an ORR onset potential of 0.99 V (vs. reversible hydrogen electrode: RHE), half-wave potential of 0.9 V (vs. RHE), and the OER potential of 1.65 V at 10 mA cm −2 in alkaline electrolyte. The assembled zinc-air flow battery with NS FeNi @COP Fe -C as the bifunctional oxygen electrocatalyst shows a discharge power up to 115 mW cm −2 and a long-term stability.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 51
·2306269
·
IF 29.4
Yu Zong,Haichao Chen,Jinsong Wang,Menghua Wu,Yu Chen,Liyu Wang,Xinliang Huang,Hongwei He,Xin Ning,Zhongchao Bai,Wen Wen,Daming Zhu,Xiaochuan Ren,Nana Wang,Shixue Dou
The challenge with aqueous zinc-ion batteries (ZIBs) lies in finding suitable cathode materials that can provide high capacity and fast kinetics. Herein, two-dimensional topological Bi 2 Se 3 with acceptable Bi-vacancies for ZIBs cathode (Cu-Bi 2−x Se 3 ) is constructed through one-step hydrothermal process accompanied by Cu heteroatom introduction. The cation-deficient Cu-Bi 2−x Se 3 nanosheets (≈4 nm) bring improved conductivity from large surface topological metal states contribution and enhanced bulk conductivity. Besides, the increased adsorption energy and reduced Zn 2+ migration barrier demonstrated by density-functional theory (DFT) calculations illustrate the decreased Coulombic ion-lattice repulsion of Cu-Bi 2−x Se 3 . Therefore, Cu-Bi 2−x Se 3 exhibits both enhanced ion and electron transport capability, leading to more carrier reversible insertion proved by in situ synchrotron X-ray diffraction (SXRD). These features endow Cu-Bi 2−x Se 3 with sufficient specific capacity (320 mA h g −1 at 0.1 A g −1 ), high-rate performance (97 mA h g −1 at 10 A g −1 ), and reliable cycling stability (70 mA h g −1 at 10 A g −1 after 4000 cycles). Furthermore, quasi-solid-state fiber-shaped ZIBs employing the Cu-Bi 2−x Se 3 cathode demonstrate respectable performance and superior flexibility even under high mass loading. This work implements a conceptually innovative strategy represented by cation defect design in topological insulator cathode for achieving high-performance battery electrochemistry.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Liying Jiang,Ke Li,Lingen Xia,Jiajun Gao,Lu Tang,Yanbo Jia
Hydrothermal carbonization (HTC) has been a promising treatment technology of heavy metal-enriched hyperaccumulator biomass to produce superior hydrochar adsorbent for contamination removal from the wastewater. However, a high amount of heavy metal in derived hydrochar limits its further application. In this study, the effect of reaction temperature (180–270 ℃) and medium pH during HTC on heavy metal contents, speciation and leaching risk of hydrochar from the hyperaccumulator biomass Sedum alfredii Hance was investigated to assess its environmental risk. HTC at a low reaction temperature and acid addition facilitated the removal of Zn/Cd/Pb from the solid phase, meanwhile the addition of acid favored the immobilization of Zn/Cd/Pb and lowered the potential leaching risk of Zn/Cd/Pb. Hydrochar prepared from HTC at 240 °C and pH = 2 had lower heavy metal content and lower releasing risk, followed by KOH modification to obtain high adsorption performance. The modified hydrohcar (KSAB) were characterized by SEM, XRD, BET, Boehm titration and FT-IR, and showed that the surface specific surface area and pore structure were optimized and OFGs of hydrochar were improved significantly after KOH treatment. Adsorption experiments showed that the Cd(II) adsorption process onto KSAB well accorded with pseudo-second-order kinetics and Langmuir isotherms. The maximum Cd(II) adsorption capacity of KSAB was 25.69 mg/g, which was 17 times compared to that of pristine hydrochar. Microstructure characteristics and mechanism analysis further suggested that electrostatic interactions, surface complexation, cation-π and ion exchange were the main Cd(II) removal mechanisms of KOH-modified hydrochar. Therefore, hydrochar derived from hyperaccumulator biomass can be used as a highly efficient absorbent to remove Cd(II) from wastewater after KOH modification.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）