18 results on '"Qiang-Qiang Yan"'
Search Results
2. Non-iridium-based electrocatalyst for durable acidic oxygen evolution reaction in proton exchange membrane water electrolysis
- Author
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Zhen-Yu Wu, Feng-Yang Chen, Boyang Li, Shen-Wei Yu, Y. Zou Finfrock, Debora Motta Meira, Qiang-Qiang Yan, Peng Zhu, Ming-Xi Chen, Tian-Wei Song, Zhouyang Yin, Hai-Wei Liang, Sen Zhang, Guofeng Wang, and Haotian Wang
- Subjects
Mechanics of Materials ,Mechanical Engineering ,General Materials Science ,General Chemistry ,Condensed Matter Physics - Abstract
Iridium-based electrocatalysts remain the only practical anode catalysts for proton exchange membrane (PEM) water electrolysis, due to their excellent stability under acidic oxygen evolution reaction (OER), but are greatly limited by their high cost and low reserves. Here, we report a nickel-stabilized, ruthenium dioxide (Ni-RuO
- Published
- 2022
3. A general synthesis of single atom catalysts with controllable atomic and mesoporous structures
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Zhen-Yu Wu, Peng Zhu, David A. Cullen, Yongfeng Hu, Qiang-Qiang Yan, Shan-Cheng Shen, Feng-Yang Chen, Haoran Yu, Mohsen Shakouri, Jose D. Arregui-Mena, Amirkoushyar Ziabari, Alisa R. Paterson, Hai-Wei Liang, and Haotian Wang
- Published
- 2022
4. Strong Metal‐Support Interactions through Sulfur‐Anchoring of Metal Catalysts on Carbon Supports
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Peng Yin, Qiang‐Qiang Yan, and Hai‐Wei Liang
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General Chemistry ,General Medicine ,Catalysis - Published
- 2023
5. Sulfur-anchoring synthesis of platinum intermetallic nanoparticle catalysts for fuel cells
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Shengqi Chu, Ming-Xi Chen, Zheng-Shu Wang, Shi-Long Xu, Peng Yin, Qiang-Qiang Yan, Li-Na Wang, Yue Lin, Cheng-Long Yang, Jianglan Shui, Hai-Wei Liang, Junfa Zhu, Huanxin Ju, Jieyuan Liu, and Chunhua Cui
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Multidisciplinary ,Materials science ,chemistry ,Chemical engineering ,Annealing (metallurgy) ,Atom ,Intermetallic ,Nanoparticle ,chemistry.chemical_element ,Anchoring ,Platinum ,Sulfur ,Catalysis - Abstract
Atomically ordered intermetallic nanoparticles are promising for catalytic applications but are difficult to produce because the high-temperature annealing required for atom ordering inevitably accelerates metal sintering that leads to larger crystallites. We prepared platinum intermetallics with an average particle size of5 nanometers on porous sulfur-doped carbon supports, on which the strong interaction between platinum and sulfur suppresses metal sintering up to 1000°C. We synthesized intermetallic libraries of small nanoparticles consisting of 46 combinations of platinum with 16 other metal elements and used them to study the dependence of electrocatalytic oxygen-reduction reaction activity on alloy composition and platinum skin strain. The intermetallic libraries are highly mass efficient in proton-exchange-membrane fuel cells and could achieve high activities of 1.3 to 1.8 amperes per milligram of platinum at 0.9 volts.
- Published
- 2021
6. Phase diagrams guide synthesis of highly ordered intermetallic electrocatalysts: separating alloying and ordering stages
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Wei-Jie Zeng, Chang Wang, Qiang-Qiang Yan, Peng Yin, Lei Tong, and Hai-Wei Liang
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Radiation-Sensitizing Agents ,Multidisciplinary ,Fever ,Cell Membrane ,Alloys ,General Physics and Astronomy ,Humans ,General Chemistry ,Antineoplastic Agents, Alkylating ,General Biochemistry, Genetics and Molecular Biology ,Phase Transition ,Carbon - Abstract
Supported platinum intermetallic compound catalysts have attracted considerable attention owing to their remarkable activities and durability for the oxygen reduction reaction in proton-exchange membrane fuel cells. However, the synthesis of highly ordered intermetallic compound catalysts remains a challenge owing to the limited understanding of their formation mechanism under high-temperature conditions. In this study, we perform in-situ high-temperature X-ray diffraction studies to investigate the structural evolution in the impregnation synthesis of carbon-supported intermetallic catalysts. We identify the phase-transition-temperature (TPT)-dependent evolution process that involve concurrent (for alloys with high TPT) or separate (for alloys with low TPT) alloying/ordering stages. Accordingly, we realize the synthesis of highly ordered intermetallic catalysts by adopting a separate annealing protocol with a high-temperature alloying stage and a low-temperature ordering stage, which display a high mass activity of 0.96 A mgPt–1 at 0.9 V in H2–O2 fuel cells and a remarkable durability.
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- 2022
7. Is Pt/C More Electrocatalytic than Ru/C for Hydrogen Evolution in Alkaline Electrolytes?
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Wei-Jie Zeng, Lin-Wei Chen, Hai-Wei Liang, Qiang-Qiang Yan, Ru-Yang Shao, and Peng Yin
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chemistry ,Inorganic chemistry ,Materials Chemistry ,Electrochemistry ,Energy Engineering and Power Technology ,Chemical Engineering (miscellaneous) ,chemistry.chemical_element ,Hydrogen evolution ,Electrolyte ,Electrical and Electronic Engineering ,Catalysis ,Ruthenium - Abstract
It has been widely accepted that Pt is more electrocatalytic than Ru for alkaline hydrogen evolution reactions (HERs), probably on the basis of the previous studies on bulk metals. Herein, we repor...
- Published
- 2021
8. Hydrolyzed seawater pearl tablet modulates the immunity via attenuating Th1/Th2 imbalance in an immunosuppressed mouse model
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Tai-Jin, Lan, Xuefei, Luo, Ming-Yue, Mo, Zhen-Xing, Chen, Fei, Luo, Si-Yin, Han, Peng, Liu, Zhong-Xiu, Liang, Ting, Zhang, Tian-Yi, Li, Qiang-Qiang, Yan, Yong, Lin, and Jiang, Lin
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Interferon-gamma ,Mice ,Th2 Cells ,Animals ,Cytokines ,Seawater ,Th1 Cells ,Tablets - Abstract
To investigate whether Hydrolyzed Seawater Pearl tablet (HSPT) could modulate the Th1/Th2 imbalance in an immunosuppressed mouse model with Th1 to Th2 shift induced by Cyclosporine A (CsA) which can be used in the clinical treatment of Th2 to Th1 shift diseases, and explore the possible mechanism for the adjuvant therapeutic efficacy of HSPT on recurrent respiratory infections (RRI) and acquired immune deficiency syndrome (AIDS).The mice were randomly divided into six groups of five animals each, namely normal group, model group, lentinan polysaccharide tablet (LPT) group and three HPST treated groups. HPST treated groups were administered with HPST (0.51, 1.02, 2.04 g/kg) via intragastric gavage (i.g) for 30 consecutive days. LPT used as reference drug for positive control, LPT group was administered with LPT (8.2 mg/kg) for 30 consecutive days. Normal group and model group were received distilled water. The animals in model group, LPT group and HPST treated groups were injected intraperitoneally with CsA (50 mg/kg) to establish the immunosuppressed mice model with Th1 to Th2 shift on the 20th, 22nd and 24th day, one hour after the administration of the respective treatment. Animals were sacrificed one hour after the last administration to collect blood and splenic tissue. The proportion of T cells including CD8+ and CD4+ T cells, Th1 and Th2 in peripheral blood of experimental mice were measured by flow cytometric. The protein level in serum and mRNA level in splenic tissue of experimental mice for interleukin (IL)-2, IL-12, interferon-γ (IFN-γ), IL-4, IL-6, IL-10 and IL-13 were measured by enzyme linked immunosorbent assay and fluorescence quantitative polymerase chain reaction respectively.HSPT elevated the proportion of T cells including both CD8+ and CD4+ T cells, in which the proportion of Th1 and Th2 cells increased, while the ratio of Th1/Th2 cells decreased in peripheral blood of the immunosuppressed mouse model with Th1 to Th2 shift induced by CsA. Furthermore, HSPT elevated both protein and mRNA level of Th1-type cytokines IL-2 and IFN-γ, while had no significant effect on protein and mRNA level of Th1-type cytokine IL-12 and Th2-type cytokines IL-4, IL-6, IL-10, IL- 13 in mouse model.Our findings suggest that HSPT can increase proportion of T cells including both CD8+ and CD4+ T cells and induce Th2 to Th1 shift in both cells and cytokines, which probably was the mechanism to account for the adjuvant therapeutic efficacy of HSPT on RRI and AIDS.
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- 2021
9. Reversing the charge transfer between platinum and sulfur-doped carbon support for electrocatalytic hydrogen evolution
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Ming-Xi Chen, Hai-Wei Liang, Qiang-Qiang Yan, Jing Zhang, Zhi-Qin Chen, Daoxiong Wu, Yue Lin, Xiaojun Wu, and Shengqi Chu
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Materials science ,Science ,General Physics and Astronomy ,chemistry.chemical_element ,02 engineering and technology ,Reaction intermediate ,Electronic structure ,Overpotential ,010402 general chemistry ,Photochemistry ,01 natural sciences ,General Biochemistry, Genetics and Molecular Biology ,Article ,Nanoclusters ,Catalysis ,Metal ,lcsh:Science ,Heterogeneous catalysis ,Multidisciplinary ,Nanoscale materials ,General Chemistry ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,chemistry ,visual_art ,visual_art.visual_art_medium ,Condensed Matter::Strongly Correlated Electrons ,lcsh:Q ,0210 nano-technology ,Platinum ,Electrocatalysis ,Carbon - Abstract
Metal–support interaction is of great significance for catalysis as it can induce charge transfer between metal and support, tame electronic structure of supported metals, impact adsorption energy of reaction intermediates, and eventually change the catalytic performance. Here, we report the metal size-dependent charge transfer reversal, that is, electrons transfer from platinum single atoms to sulfur-doped carbons and the carbon supports conversely donate electrons to Pt when their size is expanded to ~1.5 nm cluster. The electron-enriched Pt nanoclusters are far more active than electron-deficient Pt single atoms for catalyzing hydrogen evolution reaction, exhibiting only 11 mV overpotential at 10 mA cm−2 and a high mass activity of 26.1 A mg−1 at 20 mV, which is 38 times greater than that of commercial Pt/C. Our work manifests that the manipulation of metal size-dependent charge transfer between metal and support opens new avenues for developing high-active catalysts., The charge transfer between metal and support is significant for catalysis, but little attention has been focused on charge transfer tuned by metal size. Here, authors report a metal size-dependent reversal of charge transfer between metal and carbon support in hydrogen evolution electrocatalysts.
- Published
- 2019
10. Hierarchically porous carbons as supports for fuel cell electrocatalysts with atomically dispersed Fe–Nx moieties
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Xinliang Feng, Cheng-Long Yang, Hai-Wei Liang, Lei Tong, Shengqi Chu, Qiang-Qiang Yan, Ming-Xi Chen, Zhi-You Zhou, Zhi-Qing Chen, and Yu-Cheng Wang
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Materials science ,010405 organic chemistry ,Proton exchange membrane fuel cell ,chemistry.chemical_element ,Nanoparticle ,General Chemistry ,Carbon black ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Catalysis ,Metal ,Porous carbon ,chemistry ,Chemical engineering ,visual_art ,visual_art.visual_art_medium ,Pyrolysis ,Carbon - Abstract
The development of high-performance non-platinum group metal (non-PGM) catalysts for the oxygen reduction reaction (ORR) is still of significance in promoting the commercialization of proton exchange membrane fuel cells (PEMFCs). In this work, a “hierarchically porous carbon (HPC)-supporting” approach was developed to synthesize highly ORR active Fe–phenanthroline (Fe–phen) derived Fe–Nx–C catalysts. Compared to commercial carbon black supports, utilizing HPCs as carbon supports can not only prevent the formation of inactive iron nanoparticles during pyrolysis but also optimize the porous morphology of the catalysts, which eventually increases the amount of reactant-accessible and atomically dispersed Fe–Nx active sites. The prepared catalyst therefore exhibits a remarkable ORR activity in both half-cells (half-wave potential of 0.80 V in 0.5 M H2SO4) and H2–air PEMFCs (442 mA cm−2 at a working voltage of 0.6 V), making it among the best non-PGM catalysts for PEMFCs.
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- 2019
11. A Top‐Down Templating Strategy toward Functional Porous Carbons
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Le‐Le Zhang, Lei Tong, Xue‐Hui Lv, Qiang‐Qiang Yan, Yan‐Wei Ding, Yu‐Cheng Wang, and Hai‐Wei Liang
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Biomaterials ,Nanopores ,Oxides ,General Materials Science ,General Chemistry ,Powders ,Porosity ,Carbon ,Biotechnology - Abstract
Nanostructured carbon materials with high porosity and desired chemical functionalities are of immense interest because of their wide application potentials in catalysis, environment, and energy storage. Herein, a top-down templating strategy is presented for the facile synthesis of functional porous carbons, based on the direct carbonization of diverse organic precursors with commercially available metal oxide powders. During the carbonization, the metal oxide powders can evolve into nanoparticles that serve as in situ templates to introduce nanopores in carbons. The porosity and heteroatom doping of the prepared carbon materials can be engineered by varying the organic precursors and/or the metal oxides. It is further demonstrated that the top-down templating strategy is applicable to prepare carbon-based single-atom catalysts with iron-nitrogen sites, which exhibit a high power density of 545 mW cm
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- 2022
12. Immunomodulatory Effects of Hydrolyzed Seawater Pearl Tablet (HSPT) on Th1/Th2 Functionality in a Mice Model of Chronic Obstructive Pulmonary Disease (COPD) Induced by Cigarette Smoke
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Tai-Jin Lan, Zhongmin Zhang, Qiang-Qiang Yan, Jiang Lin, Zhenxing Chen, Si-Yin Han, Peng Liu, and Yong Lin
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CD3 ,Pulmonary disease ,Spleen ,Inflammation ,Review Article ,Pharmacology ,03 medical and health sciences ,Other systems of medicine ,0302 clinical medicine ,medicine ,030304 developmental biology ,0303 health sciences ,COPD ,Lung ,medicine.diagnostic_test ,biology ,business.industry ,medicine.disease ,respiratory tract diseases ,Bronchoalveolar lavage ,medicine.anatomical_structure ,Complementary and alternative medicine ,030220 oncology & carcinogenesis ,biology.protein ,medicine.symptom ,business ,Infiltration (medical) ,RZ201-999 - Abstract
Chronic obstructive pulmonary disease (COPD) is predicted to become the third leading cause of death around the world. The present study is designed to investigate whether hydrolyzed seawater pearl tablet (HSPT) has immunoregulatory effects on the Th1/Th2 functionality in cigarette smoke-induced COPD model mice. The determination of the amino acid composition of HSPT was carried out by high-performance liquid chromatography (HPLC) with precolumn phenylisothiocyanate (PITC) derivatization. COPD model mice were constructed by cigarette smoking (CS) treatment and HSPT was administered. HSPT inhibited the infiltration of inflammation in the airway of the lung, reduced influx of eosinophils (EOSs), lymphocytes (LYMs), neutrophils (NEUs), and macrophages (MACs) in the bronchoalveolar lavage fluid (BALF), decreased the levels of IFN-γ, IL-2, IL-4, and IL-10 in the serum and lung, and decreased the expression of aforementioned cytokines in the spleen and lung in CS-treated mice. Besides, HSPT also had the ability to reduce the amount of CD3+CD4+ T cells and modulate the Th1/Th2 balance. Taken together, this study supports the consensus that CS is a critical factor to induce and aggravate COPD. HSPT could regulate the balance of Th1/Th2 in CS-induced COPD model mice, indicating its effects on inhibiting the development of COPD.
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- 2020
13. Hierarchically Porous Carbons Derived from Nonporous Coordination Polymers
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Cheng Hua, Le-Le Zhang, Li-Yang Wan, Yanwei Ding, Yu-Cheng Wang, Bo Liu, Hai-Wei Liang, Lei Tong, Qiang-Qiang Yan, Zhi-You Zhou, and Chen-Jia Jiao
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chemistry.chemical_classification ,Materials science ,Carbonization ,Coordination polymer ,Ligand ,02 engineering and technology ,Polymer ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Heterogeneous catalysis ,01 natural sciences ,0104 chemical sciences ,Catalysis ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,General Materials Science ,0210 nano-technology ,Porosity ,Porous medium - Abstract
Hierarchically porous carbons (HPCs) with multimodal pore systems exhibit great technological potentials, especially in the fields of heterogeneous catalysis, energy storage, and conversion. Here, we establish a simple and general approach to HPCs by carbonization of nonporous coordination polymers that are produced by mixing metal salts with polytopic ligands in alkaline aqueous solutions at room temperature. The proposed approach is applicable to a wide scope of ligand molecules (18 examples), thus affording the synthesized HPCs with high diversity in porosity, morphology, and composition. In particular, the prepared HPCs exhibit high specific surface areas (up to 2647 m2 g-1) and large pore volumes (up to 2.39 cm3 g-1). The HPCs-supported atomically dispersed Fe-Nx catalysts show much-improved fuel cell cathode performance over the micropore-dominated carbon black-supported catalysts, demonstrating the structural superiority of the HPCs for enhancing the mass transport properties.
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- 2020
14. A sulfur-tethering synthesis strategy toward high-loading atomically dispersed noble metal catalysts
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Ming-Xi Chen, Hai-Wei Liang, Ping Chen, Shi-Long Xu, Shengqi Chu, Lei Wang, Qiang-Qiang Yan, and Yue Lin
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Materials science ,Materials Science ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,010402 general chemistry ,01 natural sciences ,Catalysis ,Metal ,chemistry.chemical_compound ,Condensed Matter::Materials Science ,Physics::Atomic Physics ,Physics::Chemical Physics ,Research Articles ,Quantitative Biology::Biomolecules ,Multidisciplinary ,Quinoline ,SciAdv r-articles ,021001 nanoscience & nanotechnology ,Sulfur ,0104 chemical sciences ,Chemistry ,chemistry ,Chemical engineering ,visual_art ,engineering ,visual_art.visual_art_medium ,Noble metal ,Condensed Matter::Strongly Correlated Electrons ,0210 nano-technology ,Selectivity ,Dispersion (chemistry) ,Mesoporous material ,Research Article - Abstract
Sulfur doped in carbon matrix can tether metal atoms to form high-loading atomically dispersed supported metal catalysts., Metals often exhibit robust catalytic activity and specific selectivity when downsized into subnanoscale clusters and even atomic dispersion owing to the high atom utilization and unique electronic properties. However, loading of atomically dispersed metal on solid supports with high metal contents for practical catalytic applications remains a synthetic bottleneck. Here, we report the use of mesoporous sulfur-doped carbons as supports to achieve high-loading atomically dispersed noble metal catalysts. The high sulfur content and large surface area endow the supports with high-density anchor sites for fixing metal atoms via the strong chemical metal-sulfur interactions. By the sulfur-tethering strategy, we synthesize atomically dispersed Ru, Rh, Pd, Ir, and Pt catalysts with high metal loading up to 10 wt %. The prepared Pt and Ir catalysts show 30- and 20-fold higher activity than the commercial Pt/C and Ir/C catalysts for catalyzing formic acid oxidation and quinoline hydrogenation, respectively.
- Published
- 2019
15. Structurally ordered intermetallic Ir3V electrocatalysts for alkaline hydrogen evolution reaction
- Author
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Xu Guo, Hai-Wei Liang, Le-Le Zhang, Qunxiang Li, Lin-Wei Chen, Ru-Yang Shao, and Qiang-Qiang Yan
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Materials science ,Renewable Energy, Sustainability and the Environment ,Inorganic chemistry ,Intermetallic ,chemistry.chemical_element ,02 engineering and technology ,Electrolyte ,Overpotential ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrocatalyst ,01 natural sciences ,Dissociation (chemistry) ,0104 chemical sciences ,Catalysis ,chemistry ,General Materials Science ,Electrical and Electronic Engineering ,0210 nano-technology ,Platinum ,Bimetallic strip - Abstract
Electrocatalysis of hydrogen evolution reaction (HER) in alkaline media is critical for the practical implementation of economical water-alkali electrolyzers. However, the sluggish water dissociation kinetics even on platinum-based electrocatalysts result in poor hydrogen-production activities. Here we report a structurally ordered Ir3V catalyst for efficiently catalyzing HER in alkaline media. The ordered Ir3V catalyst exhibits a low overpotential of 9.0 mV at 10 mA cm−2 in 1.0 M KOH electrolyte with Ir loading of 19 µg cm−2, corresponding a mass activity of 1200 A gIr−1 at the overpotential of 20 mV, which is 6.7, 9.4, and 3.3 times greater than that of the commercial Pt/C, Ir/C, and disordered Ir3V catalysts. The enhanced HER kinetics is ascribed to the charge redistribution on the ordered Ir3V surface with the maximized number of neighboring bimetallic Ir/V sites compared to the disordered solid solution counterpart, which promotes the water dissociation on the electron-deficient V sites.
- Published
- 2021
16. Transition metal–assisted carbonization of small organic molecules toward functional carbon materials
- Author
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Zhi-Qin Chen, Shu-Hong Yu, Hai-Wei Liang, Chao Li, Zhen-Yu Wu, Qiang-Qiang Yan, Yanwei Ding, and Shi-Long Xu
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Materials science ,Materials Science ,chemistry.chemical_element ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,Heterogeneous catalysis ,Electrocatalyst ,01 natural sciences ,Catalysis ,Transition metal ,Thermal stability ,Porosity ,Research Articles ,Multidisciplinary ,Carbonization ,digestive, oral, and skin physiology ,fungi ,food and beverages ,SciAdv r-articles ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Chemistry ,chemistry ,0210 nano-technology ,Carbon ,Research Article - Abstract
A transition metal–assisted carbonization process can convert small organic molecules to functional carbon materials directly., Nanostructured carbon materials with large surface area and desired chemical functionalities have been attracting considerable attention because of their extraordinary physicochemical properties and great application potentials in catalysis, environment, and energy storage. However, the traditional approaches to fabricating these materials rely greatly on complex procedures and specific precursors. We present a simple, effective, and scalable strategy for the synthesis of functional carbon materials by transition metal–assisted carbonization of conventional small organic molecules. We demonstrate that transition metals can promote the thermal stability of molecular precursors and assist the formation of thermally stable polymeric intermediates during the carbonization process, which guarantees the successful preparation of carbons with high yield. The versatility of this synthetic strategy allows easy control of the surface chemical functionality, porosity, and morphology of carbons at the molecular level. Furthermore, the prepared carbons exhibit promising performance in heterogeneous catalysis and electrocatalysis.
- Published
- 2018
17. The Study on Numerical Calculation of Unequal Potential Grounding Parameters of Large Hydropower Plant
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Pu Gao, Li Ping Dai, and Qiang Qiang Yan
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Permeability (earth sciences) ,Engineering ,business.industry ,Ground ,Nodal analysis ,Soil resistivity ,Geotechnical engineering ,General Medicine ,business ,Grid ,Boundary element method ,Hydropower ,Conductor - Abstract
To solve the problem of grounding parameters of large hydropower, which is in a special soil environment, we deduced unequal potential calculation formula ,based on the model of unequal potential in ground grid and combined with the boundary element method and node voltage method. Through example calculations, the paper analyzes the impact of the ground grid size, soil resistivity and conductor permeability on unequal potential and proves the accuracy of the results, compared with CDEGS software. This method can be used in grounding calculation and analysis of large hydropower stations.
- Published
- 2014
18. Calibration and data restoration of light field modulated imaging spectrometer
- Author
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Yujian Liu, Lijuan Su, Yan Yuan, Shi-Feng Wang, and Qiang-Qiang Yan
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Materials science ,Calibration (statistics) ,business.industry ,Imaging spectrometer ,General Physics and Astronomy ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,010309 optics ,Optics ,0103 physical sciences ,Data restoration ,0210 nano-technology ,business ,Light field - Published
- 2018
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