CATALYSIS LETTERS
·
2024
·
IF 2.3
Xiang Xiaoyan,Liao Xu,Yan Qijiang,Yuan Qiulan,Zhou Long,Zhang Ruiming,Lin Jinqing,Lin Xihuang
In this paper, porous Brønsted acidic ionic liquid modified catalyst ILs-AB-8 was successfully synthesized by using 3 steps of Friedel–Crafts hyper-crosslinking synchronous chloromethylation, imidazlole grafting and sulfonic functionalization using macroporous polystyrene AB-8 resin as a raw material. The porous ionic liquid immobilized catalyst ILs-AB-8 exhibits a hierarchical pore structure by the coexistence of abundant macropore, mesopore, and micropore. The catalyst IL 2 -AB-8 with dual Brønsted acid sites(-SO 3 H acid site and p-methylbenzenesulfonic acid site), large surface area (327.19 m 2 /g), high ionic liquid loading amount (IEC 2.03 mmol/g) displayed excellent catalytic activity, with methyl oleate yield up to 95.65% at 338 K in 100 min. The enhanced catalytic performance of IL 2 -AB-8 can be ascribed to the novel Friedel–Crafts hyper-crosslinking process in conjunction with chloromethylation, coupled with th in situ generated activating chloromethyl group incorporated onto the surface of the AB-8 carrier. The hyper-crosslinking approach also effectively transforms the macroporous AB-8 carrier into a multi-level pore structure. This work highlights that IL 2 -AB-8 with high specific surface area, ionic liquid loading content, and strong covalent connection with carrier was coordinated to provide an efficient metal-free heterogeneous catalyst for biodiesel production. Graphical Abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 3
·1727-1737
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IF 4.682
Wu Jingjie,Qiu Xianyu,Chen Shuixia
Abstract A 3D porous graphene aerogel (GA) was prepared via one-step hydrothermal method and freeze-drying technology, in which organic amine reagents were used as cross-linker to combine the graphene oxide (GO) sheets. With abundant amino groups, the organic amine reagents also acted as adsorption sites to improve CO 2 adsorption capacity. Morphology, pore structure and surface chemical structure of the as-prepared materials were characterized by SEM, FTIR, XRD, Raman, TG, N 2 adsorption–desorption. CO 2 adsorption performance was evaluated by dynamic adsorption experiments in a fixed-bed column. Aminated by tetraethylenepentamine (TEPA), the prepared 3D graphene aerogel (TEPA-GA-3–1) achieved a CO 2 adsorption capacity as high as 2.27 mmol g −1 at 25 °C, 0.1 bar, which was attributed to its developed porous structure and high amino density. Further, the existence of water could improve the CO 2 adsorption amount because H 2 O directly participates the reaction of CO 2 with amine to form bicarbonates. The prepared GA adsorbent also exhibited good stability after six adsorption–desorption cycles. The above result suggests that amine-modified graphene aerogel has a potential application for CO 2 capture from flue gas. Graphical abstract
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高影响因子
Cell Reports Physical Science
·
2023
·
IF 8.9
Xue-Feng Zhang,Hong-Hong Zou,Li-Weng Ding,Xiao-Xiao Deng,Jia-Jun Zheng,Han-Feng Liu,Zi-Ming Ye,Shengliang Zhong,Zi-Yi Du,Jia Zhang,Chun-Ting He
Summary Rare-earth doping is an efficient strategy to elevate the oxygen evolution reaction activity of transition-metal-based electrocatalysts, yet it often leads to deleterious electrochemical corrosion. Here, we introduce non-layered dysprosium oxysulfide (Dy 2 O 2 S) to a cobalt catalyst to address this issue. Benefiting from an electron-withdrawing Dy 2 O 2 S shell, the optimum chainmail-structured catalyst displays low overpotentials of 225 ± 1 and 299 ± 5 mV at 0.1 and 1.0 A·cm −2 , respectively, for the oxygen evolution reaction under industrially relevant conditions. Moreover, Dy 2 O 2 S blocks the dissolution of dysprosium and cobalt, endowing the catalyst with almost 100% activity retention for at least 120 h at 1 A·cm −2 . A variety of in situ / ex situ characterization techniques and theoretical calculations unveil the active sites and the interfacial electron redistribution, which facilitate the oxygen intermediate adsorption and oxygen desorption. This work provides a route to utilize rare-earth elements to optimize the performance of electrocatalysts.
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高影响因子
THIN SOLID FILMS
·
2024
·
IF 2
Xinghai Han,Guihong Song,Shuang Yang,Yusheng Wu,Junhua You
Mg 3 Bi 2 /Mg 2 Sn nanocomposite films were prepared on single Si substrate using high pure metal Mg, Mg 3 Bi 2 and Mg 2 Sn target by alternately sputtering. The phase composition of the deposited Mg 3 Bi 2 /Mg 2 Sn films was analyzed by X-ray diffraction patterns. The surface and cross-sectional morphology of the deposited Mg 3 Bi 2 /Mg 2 Sn films was observed by scanning electron microscope. The content and distribution of elements in the deposited Mg 3 Bi 2 /Mg 2 Sn films were measured by an energy dispersive spectroscopy. The Seebeck coefficient and electrical conductivity of the deposited films was measured by Seebeck coefficient/resistance analysis system. The carrier concentration and carrier mobility of the sample was measured and calculated by Hall experiments. Results showed that the Mg 3 Bi 2 /Mg 2 Sn films were composed of Mg 3 Bi 2 , Mg 2 Sn and a few of metal Mg phase. The carrier (hole) concentration and Seebeck coefficient gradually increased, but the mobility and electrical conductivity decreased with increasing the Mg 2 Sn phase content in deposited films. As a result of the competition between the electrical conductivity and the Seebeck coefficient, the power factor first increased, reached a maximum value of 1.20 mW·m −1 ·K −2 at 155 °C, and then decreased. The deposited Mg 3 Bi 2 /Mg 2 Sn nanocomposite films with 6.5 at.% Sn possessed the highest power factor in measured temperature range. The power factor of deposited Mg 3 Bi 2 films can be effectively improved by adding moderate Mg 2 Sn phase and forming Mg 3 Bi 2 /Mg 2 Sn nanocomposite films.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Junjie Liu,Ning Qi,Bo Zhou,Zhiquan Chen
A series of amorphous melamine-based polymer networks synthesized by Schiff base chemistry (SNW) were successfully prepared by varying the strut length. The pore structure was analyzed by gas adsorption and positron annihilation methods. Positron lifetime measurements indicate the existence of ultramicropores and also larger mesopores in the SNW materials. The sizes of micropores and mesopores are almost the same in these samples, which are about 0.7 and 16.5 nm, respectively. The relative number of micropores increases in the order of SNW-1 < SNW-2 < SNW-3, while the number of mesopores increases in the reverse order. N2 adsorption/desorption measurements also reveal micropores and mesopores in these materials. However, it gives an underestimation of the micropore volume. Benefiting from the abundant nitrogen content and high microporosity, the SNW materials exhibit exceptionally high CO2 capture ability, which reaches a maximum value of 18.3 wt % in SNW-3 at 273 K and 1 bar, followed by SNW-2 and SNW-1. This order is exactly the same as the order of micropore volume revealed by positron annihilation measurement, suggesting that micropores play a crucial role in the CO2 uptake. Our results show that positron can provide more precise information about the structure of micropores and thus can offer an accurate prediction for the adsorption capacity of complex porous materials.
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高影响因子
ACS Omega
·
2018
·
IF 0
Jinting Gao,Jinjin Yin,Zhanhui Tao,Yaqing Liu,Xiaodong Lin,Jiankang Deng,Shuo Wang
Whether short-term or long-term, overexposure to an abnormal amount of copper ion does significant harm to human health. Considering its nonbiodegradability, it is critical to sensitively detect copper ion. Herein, a novel fluorescent strategy with a “turn-on” signal was developed for highly sensitive and specific detection of copper ion (Cu2+). In the present investigation, we found that Cu2+ exhibits excellent peroxidase-like catalytic activity toward oxidizing the nonfluorescent substrate of Amplex Red into the product of resofurin with outstanding fluorescence emission under the aid of H2O2. Thus, an enzyme-free and label-free sensing system was constructed for copper ion detection with quite simple operation. To ensure the detection sensitivity and reproducibility, the amount of H2O2 and incubation time were optimized. The limit of detection can reach as low as 1.0 nM. In addition, the developed assay demonstrated excellent specificity and could be utilized to detect copper ion in water samples including tap water and bottled purified water without standing recovery.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Shuai Heng,Qiang Shi,Xueying Zheng,Yan Wang,Qunting Qu,Gao Liu,Vincent S. Battaglia,Honghe Zheng
Carbon coating technologies for olivine-structured LiFePO 4 have been successfully commercialized in lithium ion industries. However, up to today, there are still many challenges overcoming the low intrinsic ionic conductivity and surface instability limitations. Herein, we propose a lithium ion conductive organic-skinned secondary coating technique by applying sodium maleate onto the surface of a commercial carbon-coated LiFePO 4 cathode. Very distinctive features of the organic skin secondary coating are highly uniform and continuous. More importantly, the abundant carbonyl groups on the LFP surface facilitates facial Li ion transport. The nanostructure tuned organic layer is able to effectively suppress the undesired side reactions at the electrode/electrolyte interface. With 6.0 wt% of the sodium maleate coating, rate capability and long-term cycling behavior of the LiFePO 4 cathode at different temperatures are significantly improved. Notably, the well-known impedance rise of LFP cathode with increasing electrochemical cycles is effectively suppressed. An insight into the mechanisms of the secondary sodium maleate coating on the carbon-coated LiFePO 4 cathode is discussed.
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高影响因子
Communications Materials
·
2020
·Vol. 1
·期 1
·1-10
·
IF 0
Jin Zhengyuan,Jiang Xiantao,Zhang Qitao,Huang Shaolong,Zhang Luhong,Huang Lili,He Tingchao,Zhang Han,Ohno Teruhisa,Ruan Shuangchen,Zeng Yu-Jia
Broad-spectrum light activation in photocatalytic materials is considered vital for effective solar-to-hydrogen energy conversion. Here, we propose an upconversion process in oxygen-doped polymeric carbon nitride (C 3 N 4 ) nanosheets, resulting in high photocatalytic activity for hydrogen generation from water splitting under infrared light irradiation. Due to the upconversion, the photoexcited electrons are transferred to the conduction band, and a σ* carbon-oxygen orbital localized on the triazine matrix ring resulting from oxygen doping extends the lifetime of photogenerated electrons, which increases the photocatalytic activity under both infrared and visible light. Our material exhibits high apparent quantum efficiency of 0.014% and 23% at 850 nm and 420 nm, respectively. Under infrared light (λ ≥ 800 nm, 24 mW cm −2 ), the hydrogen production rate of our material is 22.84 μmol h −1 g −1 , which can reach a yield similar to that of pristine C 3 N 4 under visible light.
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Flexible and Printed Electronics
·
2022
·Vol. 7
·期 2
·025001
·
IF 3.768
Wenjing He,Chenchao Huang,Xinzhou Wu,Wenming Su,Zheng Cui
Electrochromic (EC) smart windows with transparency-tuning capability can provide buildings with effective sun-shading and privacy to occupants at low energy consumption. The essential requirements to EC windows are fast response, dynamic tunability and low-cost. Recent development in all-in-one electrochromic devices (ECDs) which combines electrolyte, EC and ion storage functions in a single gel has the advantage of single layer structure and can be manufactured in large areas at low cost. However, the coloring voltage and time of all-in-one ECDs can be influenced by the viscosity of active gel. By raising the working temperature, the ECD may have faster response time and lower coloring voltage due to reduced gel viscosity. To enable high working temperature, a high conductivity and high transparency metal-mesh heating film was integrated to an EC window glass. The coloring performance of the EC window was investigated at different heating temperatures compared to its room temperature performance. It was found that working at 70 °C the coloring efficiency was doubled and the response speed of the device is five times faster than that at room temperature. The integrated metal-mesh heating film also brought added benefits such as defog and defrost for car windshield.
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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 6
·3576-3583
·
IF 11.301
Shijun Tang,Guiwei Chen,Fucheng Ren,Hongchun Wang,Wu Yang,Chenxi Zheng,Zhengliang Gong,Yong Yang
The electronic conductivity of solid electrolytes, which plays an important role in inducing Li dendrite deposition, is a key obstacle to the practical application of Li metal in all-solid-state lithium metal batteries. Herein, an ultrathin insulating LiF coating with controllable thickness is proposed as an electronic isolation layer to inhibit the formation of Li dendrites. The homogeneous LiF interfacial layer can effectively facilitate the physical contact of the Li metal and LLZTO electrolyte and promote uniform Li plating/stripping. In contrast to the inhomogeneous lithium nucleation and dendritic lithium growth in an unmodified LLZTO electrolyte induced by electron beam irradiation, dendritic Li deposition is efficiently inhibited on LiF coated LLZTO. The Li|0.5LF-LLZTO|Li symmetric cell exhibits a low interfacial impedance of 12.7 ohm cm2 and stable Li plating/stripping without lithium penetration, over 1500 hours at 0.2 mA cm−2 and 300 hours at 0.4 mA cm−2. Besides, the Li|0.5LF-LLZTO|LiCoO2 full cell also shows excellent long-term cycling stability with a high capacity retention of 76.8% after 2500 cycles at 1C. Our results reveal the importance of tuning the interface modification layer properties to guide the uniform lithium plating toward suppressing Li dendrite formation in solid electrolytes.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Yiming Wang,Hong Li,Ze-nan Hu,Xin Chen,Zejun Sun,Yongjian Ai,Wenjuan Xu,Wenhui Zhang,Kelong Ding,Chengrui Li,Tong Jiang,Shuya Zhao,Haipeng Wang,Gang Zhang,Hong-bin Sun
Designing and developing efficient synergistic catalytic systems has always been an exciting topic. In this work, a sandwich-type nanocomposite , UiO-66-NH 2 @Pt@PCN-222, was utilized as a synergistic catalytic system for the selective reduction of nitrobenzaldehydes to nitrobenzyl alcohols. Benefiting from the synergy of PCN-222 and Pt NPs, the catalyst can efficiently promote the formation of 10 nitrobenzyl alcohols under mild conditions within as short as 30 min. Moreover, the PCN-222 provides not only active sites but also protection for metal nanoparticles , so the catalyst remained intact activity in cycles. This work has reference significance for the construction of synergistic catalytic systems.
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高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Kangmeng Zhu,Xisong Wang,Dong Chen,Wei Ren,Heng Lin,Hui Zhang
Wood-based biochar, as a metal-free heterogeneous activator of peroxydisulfate (PDS), was successfully prepared by pyrolysis of polar sawdust for efficient removal of Acid Orange 7 (AO7). The results demonstrate PDS could be effectively activated by wood-based biochar, and AO7 was rapidly eliminated in a wide range of pH value (3.0–10.0) with AO7 removal achieved ≥ 99.3% after 14 min reaction. The dominant reactive species in the biochar/PDS system were verified via radical quenching tests and electron paramagnetic resonance (EPR) technique. It is speculated that sulfate radicals (SO 4 •− ) and hydroxyl radicals ( • OH) were formed on the surface of biochar. Based on the results of X-ray photoelectron spectroscopy (XPS), π-electron density and oxygen-containing functional groups (especially C–OH) on biochar surface were active centers for the catalytic reaction. Recycle experiments of biochar for 4 runs were carried out and the regeneration method of the catalyst was also studied.
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高影响因子
危险品化学品经营许可证（带存储）