ELECTROCHIMICA ACTA
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2022
·
IF 7.336
Sijie Gao,Shuozhen Hu,Guoming Luo,Shigang Sun,Xinsheng Zhang
Doping nitrogen (N) into the carbon support was widely applied to enhance the performance of Pd toward formic acid electro-oxidation (FAO). However, traditional nitrogen doping methods can only introduce a low content of nitrogen as well as a two-step complicated procedure to synthesize catalysts. In this study, a facile one-pot strategy is demonstrated to prepare N-doped carbon encapsulated palladium nanoparticles (Pd@N x C) via the pyrolysis of 2,2′-bipyridine palladium (II) complexes. A N-doped carbon layer with the thickness of about 4 nm is in-situ generated over Pd nanoparticles by only one pyrolysis procedure. Both XPS and in-situ XRD results suggest that metallic Pd is reduced from Pd 2+ by the complexed N in bipyridine during the pyrolysis at high temperature. The physical characterizations prove that the in-situ formation of N-doped carbon shell can not only effectively prevent the agglomeration or dissolution of Pd nanoparticles, but also promote the charge donation from the carbon layer to Pd, and maintain the structure of Pd atom complexed to two pyridinic-N atoms (Pd-N). This in-situ synthesis strategy can be successfully applied to carbon supports with different geometry, such as reduced graphene oxide and Vulcan XC-72. Pd@N 3 C/rGO, which contains the highest amount of N (7.39 at.%) and Pd-N (33.15%), shows the highest specific activity (5.88 mA cm −2 ) and excellent durability toward FAO.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Lifeng Cui,Zhide Wang,Shifei Kang,Yanyan Fang,Ya Chen,Weikang Gao,Zhiyuan Zhang,Xin Gao,Chunyu Song,Xiaodong Chen,Yangang Wang,Guoxiu Wang
Potassium-ion batteries (KIBs) are gradually being considered as an alternative for lithium-ion batteries because of their non-negligible advantages such as abundance and low expenditure of K, as well as higher electrochemical potential than another alternative─sodium-ion batteries. Nevertheless, when the electrode materials are inserted and extracted with large-sized K+ ions, the tremendous volume change will cause the collapse of the microstructures of electrodes and make the charging/discharging process irreversible, thus disapproving their extended application. In response to this, we put forward a feasible strategy to realize the in situ assembly of layered MoSe2 nanosheets onto N, P codoped hollow carbon nanospheres (MoSe2/NP-HCNSs) through thermal annealing and heteroatom doping strategies, and the resulting nanoengineered material can function well as an anode for KIBs. This cleverly designed nanostructure of MoSe2/NP-HCNS can broaden the interlayer spacing of MoSe2 to boost the efficiency of the insertion/extraction of K ions and also can accommodate large volume change-caused mechanical strain, facilitate electrolyte penetration, and prevent the aggregation of MoSe2 nanosheets. This synthetic method generates abundant defects to increase the amounts of active sites, as well as conductivity. The hierarchical nanostructure can effectively increase the proportion of pseudo-capacitance and promote interfacial electronic transfer and K+ diffusion, thus imparting great electrochemical performance. The MoSe2/NP-HCNS anode exhibits a high reversible capacity of 239.9 mA h g–1 at 0.1 A g–1 after 200 cycles and an ultralong cycling life of 161.1 mA h g–1 at 1 A g–1 for a long period of 1000 cycles. This nanoengineering method opens up new insights into the development of promising anode materials for KIBs.
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FUEL
·
2022
·
IF 8.035
Zhongqi Ren,Hui Yu,Xiaojia Wu,Weidong Liu,Fan Zhang,Shichao Tian,Zhiyong Zhou
The separation of aromatics and aliphatic hydrocarbons is one of the most challenging and energy consuming operations in the petrochemical industry. In this work, two switchable solvents, 1,8-diazabicyclo[5.4.0]undec-7-ene imidazole ([DBU][Im]) and 1,1,3,3-tetramethylguanidine imidazole ([TMG][Im]), were synthesized and used for phase-change separation of toluene from n-heptane. The structures of these two switchable solvents were analyzed by 1 H Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared (FT-IR) spectroscopy. The miscibility of various components in these two ILs before and after treatment with CO 2 were studied, the results of which indicated that both these two switchable solvents could be utilized to achieve the effective separation of toluene from n-heptane. Among them, [TMG][Im] was preferable to be used at a low toluene content in the initial toluene/n-heptane system through feasibility study. The effects of extraction time, switchable solvent dosage and molar fraction of toluene on separation performance and the reusability were also investigated, demonstrating that [TMG][Im] could be used simply and feasibly for phase-change separating toluene from n-heptane and showed very good reusability and stability. Finally, the mechanism of reversible phase-change extraction process with [TMG][Im] was explored, indicating that the formation of [TMG][ImCO 2 ] could greatly increase the polarity of the switchable solvent, which is conducive to separating toluene and recovering [TMG][Im] by removing CO 2 .
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JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 60
·期 9
·1468-1479
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IF 3.046
Ming Duan,Gang Wu,Tianbin Gu,Xiaohui Jiang,Lei Zhao,Limei Zhou,Yunwen Liao,Qiang Pu
Present work reports a new type of poly( N -alkyl-2-[4-hydroxybut-2-ynyl] pyridinium bromides) (designated as Po-n, n = 8, 12, 16 of carbon atoms in the alkyl chain). Po-n were synthesized and characterized by FTIR, GPC, and NMR analysis. The possible polymerization mechanism was proposed and supported by theoretic calculation. A preliminary probe was performed on the conductivity and anticorrosive ability of the conjugated polymer. The results showed that these polymers demonstrated poor conductivity, however the conductivity was enhanced by graphene doping. Po-n are good inhibitors for X70 steel corrosion in HCl solution. So, the conjugated polymers may play important roles in the fields of optoelectronic devices and steel corrosion inhibition. Graphical
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiaoqin Liu,Chengjie Guo,Nannan Wu,Chenguang Li,Ruijuan Qu,Zunyao Wang,Riya Jin,Yina Qiao,Zengdi He,Jing Lu,Xingqiao Feng,Yufan Zhang,Anlong Wang,Jingshuai Gao
In this work, the kinetics and mechanisms of photocatalytic degradation of perfluorooctanoic acid (PFOA) by nitrogen-doped indium trioxide (N-doped In 2 O 3 or NH 4 NO 3 -In 2 O 3 ) under Xe lamp irradiation were systematically investigated. Nitrogen originating from various inorganic and organic nitrogen compounds was doped into In 2 O 3 to examine the catalytic effect. The NH 4 NO 3 -In 2 O 3 catalyst was characterized by SEM , TEM, FT-IR, UV-DRS, BET surface area, XPS, and XRD , and showed the best catalytic performance. After 18 h of irradiation, PFOA was almost completely degraded with addition of 5 mg catalyst, while it was hardly degraded by simulated sunlight alone. The low photocatalytic degradation efficiency of PFOA was observed in different natural waters, which was due to the inhibitory effect of high pH and common anions like SO 4 2− . The calculation results of Materials Studio showed that a shoulder-to-shoulder π system between nitrogen atom and oxygen atom (NO π*) was formed after nitrogen doping into interstitial sites of In 2 O 3 , therefore resulting in a reduction in band gap energy. Occupied NO π* states were responsible for the red shift, while unoccupied NO π* levels restrained the recombination of electrons (e − ) and holes (h + ). Nitrogen doping reduced the excitation energy for electronic transition, and thus accelerated the reaction. According to mass spectrometry analysis, decarboxylation and elimination were still the main photodegradation pathways of PFOA. To the best of our knowledge, this report is the first to explore the reaction mechanisms of PFOA in an N-doped In 2 O 3 /Xe lamp irradiation system.
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Marine Drugs
·
2022
·Vol. 20
·期 2
·86
·
IF 6.085
Jingmin Cui,Xia Ji,Yingqi Mi,Qin Miao,Fang Dong,Wenqiang Tan,Zhanyong Guo
N-2-hydroxypropyltrimethyl ammonium chloride chitosan (HACC), a cationic quaternary ammonium salt polymer exhibiting good solubility in water, is widely used because of its low toxicity and good biocompatibility. Herein, through ion exchange reaction, we preparedN-2-hydroxypropyltrimethyl ammonium chitosan derivatives bearing amino acid Schiff bases with good biological activities. The accuracy of the structures was verified by FT-IR and1H NMR. The antibacterial activity, antifungal activity, and scavenging ability of DPPH radical and superoxide radical of HACC derivatives were significantly improved compared with that of HACC. In particular, HACGM (HACC-potassium 2-((2-hydroxy-3-methoxybenzylidene)amino)acetate) and HACGB (HACC-potassium 2-((5-bromo-2-hydroxybenzylidene)amino)acetate) showed good inhibitory effect on bacteria and fungi, includingStaphylococcus aureus,Escherichia coli,Botrytis cinerea,andFusarium oxysporumf. sp.cubense. The inhibition rate of HACGB onStaphylococcus aureusandEscherichia colicould reach 100% at the concentration of 0.1 mg/mL, and the inhibition rate of HACGM and HACGB onBotrytis cinereaandFusarium oxysporumf. sp.cubensecould also reach 100% at the concentration of 0.5 mg/mL. Improving antimicrobial and antioxidant activities of HACC could provide ideas and experiences for the development and utilization of chitosan derivatives.Keywords:N-2-hydroxypropyltrimethyl ammonium chloride chitosan;amino acid Schiff bases;antimicrobial activity;antioxidant activity
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CATALYSIS TODAY
·
2022
·
IF 6.562
Yunfei Ma,Wenhui Yue,Zehong Xu,Ziwei Ye,Jinlong Zhang
Composite nanoparticles consisting upconversion nanoparticles (β-NaYF 4 :Yb/Er) and nitrogen doped TiO 2 nanoparticles were constructed via a chemical assembly method. Efficient energy transfer was enabled since the upconverted energy matched up with the band gap of N-TiO 2 . This enables the resulting composite nanoparticles to possess excellent Rhodamine B (RhB) degradation activity under near infrared (NIR) light irradiation.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Hui Zhangsun,Qinzhi Wang,Zhihao Xu,Jiao Wang,Xiaoshuai Wang,Yijian Zhao,Hui Zhang,Shuang Zhao,Lihua Li,Zhenyu Li,Li Wang
Enhancing catalytic activity is the key to develop electrochemical sensors for monitoring of neonicotinoid such as imidacloprid (IMI), thiamethoxam (THX) and dinotefuran (DNF). Herein, a MOF-derived octahedral NiCu nanoporous carbon composite with abundant N -doped (N/ [email protected] ) was synthesized, which was exploited as electrochemical sensor for neonicotinoid determination. Integrating the synergistic effect of NiCu nanoalloy and the hierarchical porous carbon structure, the N/ [email protected] /GCE significantly promoted the diffusion between electrolyte and active site. Meanwhile, the introduction of polyvinylpyrrolidone (PVP) improved the hydrophilicity and dispersibility of N/ [email protected] , endowing superior electrocatalytic performance for IMI, THX and DNF determination, with linear ranges of 0.5–60, 1–60 and 0.5–60 μM, respectively, and detection limits of 0.017, 0.007 and 0.001 μM. Additionally, the sensor can determine IMI, THX and DNF in apples, tomatoes and potatoes with the recovery rate of 92.1–103.4% and RSD ≤ 4.7%. This study has explored a novel modified electrode material for construction of neonicotinoid sensors.
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FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Bowen Luo,Linxuan Zhou,Zhipeng Tian,Yao He,Riyang Shu
Biochar is a promising support to prepare metal-based catalysts due to its large surface area and special porous structure . This work proposed a novel Ru-based biochar catalyst by using KCl and melamine as templates to produce micro-mesoporous structure and realize N-doping at the same time. The prepared Ru/NMC catalyst showed a good hydrogenolysis performance of cornstalk lignin in supercritical ethanol. A series of catalyst characterizations were carried out to reveal the effects of micro-mesoporous structure and N-doping on the lignin hydrogenolysis. The micro-mesoporous structure led to a large surface area, which favored the dispersion of metal site and facilitated the mass transfer and diffusion during lignin hydrogenolysis, while the N-doping formed abundant edge N atoms, which promoted the interaction and the electron transfer between the loaded Ru and the support. These two crucial factors synergistically improved the lignin hydrogenolysis, with 31.2 wt% monomer yield at the reaction temperature of 260 °C.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 10
·7543-7558
·
IF 2.779
Duan Mengtian,Wu Daoxin,Wu Jialun,Tong Haixia
A precipitation process was used to produce Ag 3 PO 4 with an irregular small polyhedral structure and an average size of 200–300 nm. Furthermore, using a simple dissolution precipitation technique, polyhedral Ag 3 PO 4 was successfully deposited on the surface of ZnWO 4 . XRD, SEM, TEM, XPS, UV–Vis DRS, and FT-IR spectroscopy were employed to analyze ZnWO 4 /Ag 3 PO 4 composites. The photocatalytic oxidation ability of composites was assessed using Rhodamine B dye degradation model. The results revealed that ZnWO 4 /Ag 3 PO 4 composite material displayed improved visible-light photocatalytic activity, with 7% ZnWO 4 /Ag 3 PO 4 exhibiting the maximum photocatalytic activity. The degradation rate of RhB was 94.0% after 120 min of visible-light irradiation. Nyquist plot indicates that 7% ZnWO 4 /Ag 3 PO 4 composites show the smallest diameter, suggesting a more effective separation of photogenerated electron–hole pairs and faster interface charge transfer. The photocatalytic activity of ZnWO 4 /Ag 3 PO 4 composites does not deteriorate considerably after four cycles, indicating their high stability. The active species capture tests show that h + and •OH are possible reactive species in the degradation reaction. Finally, the p-n heterojunction mechanism is proved by the discussion of the band structure. This study demonstrates that ZnWO 4 /Ag 3 PO 4 photocatalytic composites can be utilized to degrade contaminants.
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Ningxiang Wu,Xiao Gu,Shuhao Zhou,Xu Han,Huitao Leng,Panpan Zhang,Pan Yang,Ying Qi,Sheng Li,Jingxia Qiu
Membrane capacitive deionization (MCDI) technology is a promising water quality desalination technology. It is reasonably necessary to find suitable electrode materials with unique properties for high desalination performance. Herein, fish scales (FSs) are selected as precursors for obtaining carbon materials with a hierarchical porous structure with the contributions from hydroxyapatites (HAs) templates, which are naturally contained in the FSs. The characterizations of the derived carbon show that it possesses an ultra-high specific surface area of 3,761.71 m 2 g −1 , a lot of micro/mesopores, natural heteroatomic doping sites and excellent wettability. As a result, it shows an excellent desalination capacity of 29.14 mg g −1 and good electrode regeneration performance, proving that the fish scales-derived carbon is promising for MCDI application.
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ChemSusChem
·
2022
·Vol. 15
·期 6
·e202102642
·
IF 9.14
Lingling Zheng,Yingji Zhao,Hongjuan Zhang,Wei Xia,Jing Tang
Graphical There's no space : Highly dispersed Fe−N x anchored on concave N-doped carbon is synthesized by space-confined strategy. The resulting NC@Fe−N−C exhibits superior oxygen reduction activity, originating from the combination of intrinsic activity and acceleration of mass electron transfer. Carbon-based electrocatalysts with atomically dispersed Fe−N−C display promising performance for oxygen reduction reaction (ORR) amongst non-precious electrocatalysts. Nonetheless, increasing the number and utilization of Fe−N−C active sites is challenging. Designing morphologies and adjusting the pore structure of carbon-based electrocatalysts would boost the mass transfer, enhance the utilization of the active sites, and increase the overall ORR performance. In this work, a concave N-doped carbon cubes structure adorned with highly external Fe−N x was designed and produced by the space-confined induced strategy. The optimal electrocatalyst revealed excellent ORR activity in both alkaline and acidic electrolytes, with half-wave potentials of 0.86 and 0.75 V, respectively. The superior performance arose from its unique concave structure, possessing more accessible active sites with improved intrinsic activity, which holds promising potential for preparing advanced ORR electrocatalysts.
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