JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Liping Feng,Yunzhen Chang,Hua Song,Wenjing Hou,Yanping Li,Yun Zhao,Yaoming Xiao,Gaoyi Han
Introducing fast pseudo-capacitance is an effective strategy to improve the capacitive performances of carbon-based materials. Here, thiourea is used as nitrogen and sulfur source to dope resorcinol formaldehyde polymer. Besides the forming of copolymer of thiourea and resorcinol formaldehyde resin, the thiourea resin also acts as template to adjust the hierarchical microstructure. The N, S co-doped porous carbon exhibits specific surface area of 3599.0 m 2 g −1 and wide pore distribution. The specific capacitance of the optimized sample can reach 461.7 F g −1 in 6.0 mol L −1 KOH electrolyte at current density of 0.1 A g −1 , and still retains 337.5 F g −1 at current density of 10.0 A g −1 , indicting good rate capability. The assembled symmetric device exhibits the maximum energy density of 14.9 Wh kg −1 at the power density of 61.9 W kg −1 based on the active materials. The capacitance can retain 98.3 % of the initial capacitance after 10,000 cycles at current of 10.0 A g −1 . Using organic electrolyte, the operating voltage can be extended to 2.1 V, so the energy density of the device reaches 38.3 Wh kg −1 at 262.5 W kg −1 . This co-doped strategy provides an effective approach to prepared carbon-based materials with high capacitive performance.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Huan Wang,Shaobo Liu,Yunguo Liu,Yetao Tang,Mingyang Dai,Qiang Chen,Yuqi Deng
The persistence of pharmaceutical and personal care products (PPCPs) such as norfloxacin (NFX) poses a serious threat to the water environment, and the development of efficient and cost-effective advanced oxidation catalysts is an important step toward resolving this issue. Herein, Fe and N co-doped graphene (FeNGO) was synthesized from graphene oxide (GO), urea, and iron salt via simple impregnation pyrolysis , and applied for activating peroxymonosulfate (PMS) to degrade NFX. FeNGO possessed a two-dimensional porous sheet structure and was rich in defects, nitrogen species, and active sites. Compared with the control catalyst doped with N or Fe alone, FeNGO/PMS system showed the best degradation performance with 97.7% removal of NFX after 30 min, the rate constant was 7.1 and 1.7 times than that for NGO and FeGO, respectively. Fe 3 N was the main active site of FeNGO, and it is confirmed that singlet oxygen ( 1 O 2 ) and superoxide radical (O 2 •- ) were the primary oxidation active species (ROS) during NFX degradation. The formation of 1 O 2 came from the transformation of O 2 •- and PMS decomposition. FeNGO showed strong pH adaptability, and also exhibited stale degradation performance in saliferous water matrices. It is believed that this work will offer theoretical and practical guidance for PMS activation by non-radical pathways.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Lixia Wang,Rongfei Ye,Panming Jian,Jiangyong Liu
Metal-free catalysts with environmental friendless, cost-competitiveness and less susceptibility to leaching and poisoning over metal-based catalysts, have revolutionized in the catalysis domain. In this respect, we herein report the first application of cheap and abundant pumpkin-derived N -doped porous carbon for the reduction of 2-methyl-4-nitrophenol assisted by NaBH 4 . The obtained catalyst is cost-competitive, efficient and robust, with an attractive mass-normalized rate constant of 4.73 s −1 g −1 and good recycling performance. Systematical analyses demonstrate that the 2-methyl-4-nitrophenol reduction reaction catalyzed by the N -doped carbon proceeds through the Langmuir–Hinshelwood kinetics and the performance enhancement benefits from the strong adsorption and activation of the substrates induced by the electronic modulation in the carbon framework via N -doping. This study opens up new avenues for the high-value use of pumpkin as well as the development of metal-free strategy in more catalytic applications.
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高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 14
·145403
·
IF 3.5
Huiying Wang,Ziyan Kong,Minghao Wang,Bing Huang,Lunhui Guan
Manganese and nitrogen co-doped porous carbon (Mn–N–C) are proposed as one of the most up-and-coming non-precious metal electrocatalysts to substitute Pt-based in the oxygen reduction reaction (ORR). Herein, we chose metal triazole frameworks as carbon substrate with hierarchical porosity for trapping and anchoring Mn-containing gaseous species by a mild one-step pyrolysis method. The optimized Mn–N–C electrocatalyst with a large metal content of 1.71 wt% and a volume ratio of 0.86 mesopores pore delivers a superior ORR activity with a half-wave potential (E1/2) of 0.92 V in 0.1 M KOH and 0.78 V in 0.1 M HClO4. Moreover, the modified Mn–N–C catalyst showed superior potential cyclic stability. The E1/2 remained unchanged in 0.1 M KOH and only lost 6 mV in 0.1 M HClO4 after 5000 cycles. When applied as the cathode catalyst in Zn-air battery, it exhibited a maximum peak power density of 176 mW cm−2, demonstrating great potential as a usable ORR catalyst in practical devices.
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高影响因子
SYNTHESIS-STUTTGART
·
2023
·Vol. 55
·期 20
·3393-3401
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IF 2.6
Yue-Lu Zhu,Jie Yan,Xiu-Xuan Xu,Zong-Yu Sun,Jiao Chen
Copper-catalyzed coupling reaction involving N-phenoxyacetamides and 2H-azirines is described, in which N–O and C–N bonds are broken and restructured. This protocol provides an efficient strategy for the highly regioselective synthesis of racemic α-amino oxime ethers. In addition, this strategy can be used to modify natural products and is gram-scale compatible.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Shangshu Peng,Shengshang Lu,Xinhai Wang,Linxi Dai,Bo Chen,Yang Wu,Quan Xie,Yunjun Ruan
The high specific surface area, excellent electrical conductivity, and chemical stability of porous carbon have increasingly garnered attention in supercapacitors. Herein, rapeseed stalks were utilized as precursors to synthesize nitrogen (N) and oxygen (O) co-doped porous activated carbon (RSAC) through processes of high-temperature carbonization and KOH activation. The optimally synthesized RSAC-10 exhibits an ultra-high specific surface area of 3085 m 2 g −1 , a specific capacitance of 354.7 F g −1 at 1 A g −1 , and remarkable cyclic stability (105% of its specific capacitance after 10,000 cycles). Moreover, a symmetric supercapacitor (SSC) fabricated with RSAC-10 electrodes and a 6 M KOH electrolyte demonstrates a high specific capacitance of 85.21 F g −1 at a current density of 0.25 A g −1 , maintaining 89.8% of its initial capacitance after 10,000 cycles. Additionally, an SSC comprising RSAC-10 electrodes and [BMIM]BF 4 electrolyte delivers an energy density of 52.6 Wh kg −1 at a power density of 375.1 W kg −1 . This work presents an effective method for valorizing crop waste and successfully prepares electrode materials with high specific surface areas alongside substantial energy and power densities.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Weiyan Jiang,Zihan Gao,Miao Shen,Jing Zhou,Rui Tang,Linjuan Zhang,Jian-Qiang Wang
The two-dimensional molybdenum carbide (Mo 2 CT x ) has a similar electronic structure to platinum, which has the potential to be one of non-precious metals catalysts for hydrogen evolution reaction (HER). However, the preparation of Mo 2 CT x by conventional HF and LiF–HCl etching method inevitably introduces the –F and –Cl terminations on the surface, which adversely affect activity and stability. In this study, the LiCl–KCl–Li 3 N molten salt was used to treat Mo 2 CT x at 600 °C and atmospheric pressure and introduce nitrogen heteroatoms . After treated in LiCl–KCl–Li 3 N molten salt, the HER performance of nitrogen-doped Mo 2 CT x is improved compared with that of un-doped Mo 2 CT x , which should be attributed to the optimization of the electronic structure of N–Mo 2 CT x and lower hydrogen adsorption energy barrier. This simple molten salt method provides a way to modify non-precious metal HER catalyst and introduce nitrogen heteroatoms.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Hao Wang,Xiaohao Liu,Guangyue Xu,Ziwei Guo,Ying Zhang
ABSTRACT Owing to Fe being the most abundant and least expensive transition metal on the earth, the utilization of Fe-based catalysts for catalytic hydrogenation has attracted worldwide attention. In this work, a series of N-doped C supported Fe catalysts (Fe-N-C) were prepared by co-pyrolysis of cellulose and ferric chloride under ammonia atmosphere. Characterization methods such as elemental analysis, atomic absorption spectroscopy, nitrogen adsorption-desorption isotherms, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were carried out to explore the physicochemical properties of the catalysts. Using hydrogenation of nitrobenzene as a model reaction, the catalysts prepared at different pyrolysis temperatures displayed different activities. Fe-N-C-700 exhibited the best activity among these catalysts, with the yield of aniline being up to 98.0% under 5 MPa H 2 at 120 °C after 12 h. Combined with the results of catalyst characterization and comparative tests, the transformation of Fe species and the generation of N-doped C, especially graphitized N-doped C, in the catalyst may be the main factors affecting the activity. A kinetic study was carried out and the apparent activation energy was obtained as 31.53 kJ/mol. The stability of the catalyst was also tested and no significant decrease in the activity was observed after 5 runs.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2021
·
IF 8.198
Jian Fang,Zhi-Qiang Wang,Xinjia Wei,Yuan Ma,Honghui Gong,Xue-Qing Gong,Zhenshan Hou
The N-formylation reaction of various amines with CO2 is a promising method to utilize CO2 for the production of high value-added chemicals. Herein, an efficient Ru catalyst system consisting of Ru complex ([PPN][Ru(CO)3Cl3]) and the ionic liquid 1-butyl-3-methylimidazolium hydrogen phosphate ([Bmim]2[HPO4]), has been developed for the N-formylation reaction. Activity evaluation demonstrated that the catalyst system exhibited good to excellent yields of formamides under very mild conditions with the assistance of ionic liquids (ILs). Furthermore, the catalyst system could be reused at least five times with a slight loss of activity in N-formylmorpholine production. Further characterization by 1H nuclear magnetic resonance (NMR), 13C NMR, and density functional theory (DFT) calculations showed that the ILs ([Bmim]2[HPO4]) could facilitate the adsorption of CO2 by a concerted action of both cations and anions of the ILs to form phosphorus carbonate intermediate, thus effectively promoting the reaction. DFT calculations demonstrated that the formation of Ru–H was the first step, and then the CO2 absorbed by [Bmim]2[HPO4] inserted directly into Ru–H by cooperating with the Ru sites to form HCOO– species. After that, formate species dissociated from Ru catalysts and dehydrated to form formamides by the catalytic action of Ru complex and the basic IL.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 5
·1857-1865
·
IF 4.478
Sun Liping,Yan Yong,Chen Shuai,Zhou Zijue,Tao Wei,Li Chao,Feng Yi,Wang Feng
Biothiol detection is of great importance for clinical disease diagnosis. Previous nanozyme-based colorimetric sensors for biothiol detection showed unsatisfactory catalytic activity, which led to a high detection limit. Therefore, developing new nanozymes with the high catalytic activity for biothiol detection is extremely necessary. Recently, single-atom nanozymes (SAzymes) have attracted much attention in biosensing due to their 100% atom utilization and excellent catalytic activity. Most previous works focus on the peroxidase-like activity of Fe-based SAzymes by using unstable and destructive H 2 O 2 as the oxidant. It is essential to develop new SAzymes with high oxidase-like activity for biosensing to break through the limitation. Herein, Co–N–C SAzymes with high oxidase-like activity are explored. Furthermore, Co–N–C SAzymes are used as a biosensor for colorimetric detection of biothiols (GSH/Cys) based on the inhibition of thiols toward the oxidase-like activity of Co–N–C SAzymes, which showed high sensitivity with a low detection limit of 0.07 µM for GSH and 0.06 µM for Cys. Besides, the method showed good reproducibility and high selectivity against other amino acids. This work offers new insights using Co–N–C SAzymes in the biosensing field.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 35
·15892-15900
·
IF 3.591
Shengjie Guan,Fan Wu,Qian Wu,Zhichao He,Jing Jiang,Yudong Huang,Li Liu
A series of new types of modified hydrosilanes were synthesized, using hydrosilanes and nitrogen heterocycles (triethoxysilane, 2-aminopyrimidine, 1,2,4-triazin-3-amine, benzylamine and 2-aminobenzothiazole), by Si–N cross-dehydrocoupling catalyzed by Ru3CO12. The results of the synthesis were then demonstrated by 1H nuclear magnetic resonance and GPC testing. Furthermore, modified silicone resins were obtained by a hydrolytic condensation reaction catalyzed by tetramethylammonium hydroxide and characterized by TGA, DSC and FT-IR. Next, excellent thermal stabilities were determined (best initial decomposition temperature was approximately 400 °C, T95% was 595 °C, the mass residue rate at 800 °C was 87.2%). Carbon fiber reinforced silicone matrix composites were manufactured according to the technical process developed using DSC and rotary viscometer test results, and the mechanical property (ILSS) showed great improvement from 34.8 to 45.8 MPa because of the modification of Si–N cross-dehydrocoupling. After pyrolysis up to 1000 °C, the composites still showed a superior ILSS value (19.6 MPa) and the modified silicone resins had a more regular and rounded microstructure and appeared to have ceramic-like particles of Si3N4. This work indicated that the silicone resin (Si–N) modified by cross-dehydrocoupling had greater competitiveness in the field of resin matrix composites.
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高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2022
·Vol. 92
·期 10
·2119-2131
·
IF 0.779
Wang Yanyan,Chen Ruicheng,Hu Yiping,Jiao Shulin,Zou Zhihong
Abstract In this study, a novel series of 7-azaindole-1,2,3-triazole bearing N -benzamide derivatives 3a – 3r were synthesized and fully characterized by 1 H NMR, 13 C NMR, and MS. The prepared compounds were tested against A549 and HepG2 cell lines by using MTT assay in vitro anticancer activity. Compounds 3d , 3l , 3q , and 3r exhibited the most promising, with IC 50 (7.83, 7.58, 9.47, and 8.65 μM, respectively) against A549 compared with Gefitinib (IC 50 , 6.77 μM) and IC 50 (6.98, 6.69, 10.18, and 7.97 μM, respectively) against HepG2 compared with Sorafenib (IC 50 , 5.65 μM). Further molecular docking studies showed that compounds 3d , 3l , 3q , and 3r can bind well to protein targets 3LXY, 4AGD, and 3WZE, so these compounds have the potential to be developed into multi-targeted kinase inhibitor.
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