ELECTROCHIMICA ACTA
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2023
·
IF 6.6
Xiaofeng Zhang,Muhammad Sufyan Javed,Syed Shoaib Ahmad Shah,Fahim Ahmed,Iftikhar Hussain,Fatimah M. Alzahrani,Norah S. Alsaiari,Sayed M. Eldin,Mohd Zahid Ansari,Weihua Han
Transition-metal oxides are a class of promising pseudocapacitive materials for high energy density supercapacitors, while their low intrinsic conductivity and remarkable volume expansion deteriorate the electrochemical properties. Herein, we develop a binder-free mesoporous architecture supported on a carbon cloth (CC) substrate based on the nitrogen (N)-doped and oxygen vacancy (Ov)-rich zinc cobalt oxide nanosheets (denoted by N-Ov-ZCO@CC). Because of the instructive synergy of doping, defect, and surface engineering achieved by N-functionalization, the N-Ov-ZCO@CC exhibits significantly enhanced electrochemical properties. The N-Ov-ZCO@CC single electrode exhibited a high capacitance of 2166.4 F/g at 1 A/g with superb rate-capability (91.2% at 20 A/g) and superior cycling stability of 98.99% up to 5,000 cycles. In addition, a zinc-ion hybrid supercapacitor (ZHSC) device, assembled with the N-Ov-ZCO@CC as the cathode and Zn-foil as the anode, shows a high energy density of 95.35 Wh/kg at the power density of 10,008 W/kg, superior to most state-of-the-art ZHSCs. This work provides an effective strategy for constructing multifunctional electrochemical energy materials for ZHSCs.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Linli Dai,Yi Xie,Yongkui Zhang,Yabo Wang
In this work, microorganism of Phanerochaete chrysosporium with iron-tolerating and accumulating abilities was cultivated and harvested as mycelial pellets, which could serve as a sustainable and environmental-friendly precursor for iron phosphide/N-doped biocarbon composite preparation. Through one-step pyrolysis process , the inherent Fe and P elements in mycelial pellet enabled the formation of well crystallized Fe 2 P particles, loading on N-doped biocarbon matrix. Benefiting from the porous structure, high specific surface area, N doping-induced defects and C O groups of biocarbon, as well as the good electron-donating property of Fe 2 P, the as-obtained Fe 2 P/BC composite performed well for bisphenol pollutant (e.g., BPAF) removal through peroxymonosulfate (PMS) activation. Specifically, almost complete BPAF removal was achieved within 30 min adsorption and 10 min catalysis process with an apparent reaction rate constant of 0.486 min −1 . The good crystallinity and protective carbon layer wrapping on Fe 2 P enabled the wide pH adaptability and low iron leaching of Fe 2 P/BC in catalytic reaction . Inorganic anions and humic acid brought only slight inhibition for BPAF removal, which could be overcome by prolonging reaction time to 30 min. Further mechanism studies indicated that reactive oxygen species , e.g., SO 4 - •, •OH and 1 O 2 were generated through both radical and non-radical pathways and contributed to BPAF degradation. After treatment by Fe 2 P/BC-PMS system, the total organic carbon (TOC) of original BPAF solution (20 mg L −1 ) was reduced by 51.6%. Fortunately, the residual degradation intermediate products showed much reduced ecotoxicity in both predicted (ECOSAR program) and experimental results (growth inhibition test using Raphidocelis subcapitata as ecological indicator).
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Journal of Food Measurement and Characterization
·
2022
·Vol. 17
·期 2
·1662-1670
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IF 3.006
Yang Zhengfei,Zhang Weijia,Zhu Jiangyu,Yin Yongqi,Xue Huaiguo,Fang Weiming
Detection and control of nitrite are major concerns in recent years for ensuring food and environmental safety. In this study, Mn, N co-doped Co-Carbons (CoMnN-Cs) were synthesized by calcination of bimetallic Co-Mn zeolite-imidazolate framework (CoMnZIF-67) materials at different temperatures (600–900 °C) in nitrogen atmosphere. Many characterizations, such as scanning electron microscope (SEM), elemental mapping, and, N 2 adsorption–desorption were performed to analyze the morphology, structure, and composition of the CoMnN-Cs. SEM revealed the generation of rich carbon nanotubes (CNTs). Mn-doping was obtained, which could be seen from the elemental mapping. The characterization also revealed that the pyrolysis temperature has an important effect to catalytic activities. From obtained results, it was found that the CoMnN-Cs prepared at 800 °C (CoMnN-Cs-800), showed better detection performance compared with CoMnN-Cs developed at other temperatures. As a result, the CoMnN-Cs-800-based sensor manifested an extended linear range (from 0.2 to 7000 μM), a low detection limit of 0.16 μM, and high sensitivity. Meanwhile, the developed sensor exhibited good selectivity, reproducibility, and long-term stability. Moreover, the sensor achieved satisfactory recoveries for the quantification of nitrite in tap water and sausage samples. This study implies CoMnN-Cs-800 is a promising material for the measurement of nitrite. Graphical abstract
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Chen Chen,Hao Sun,Shengyu Zhang,Xiaosi Su
Biochar has demonstrated significant potential as an alternative to carbonaceous catalysts in peroxydisulfate (PDS) activation for the oxidation of organic pollutants . However, the catalytic performance of pristine biochar generally remains unsatisfactory due to its inert conjugated carbon framework and limited redox moieties. It is of great necessity to fabricate biochars with abundant effective sites to promote the degradation of pollutants mainly through the non-radical mechanism. Herein, corn stalk and melamine were selected as a precursor for preparing nitrogen-doped biochar (N-BC) through ball-milling and high-temperature pyrolysis under oxygen-limited conditions. Benefiting from the unique properties of nitrogen-doped biochar (N-BC), such as large specific surface area, well-formed oxygen-containing groups, and abundant structural defects, the 2,4-dichlorophenol (2,4-DCP) degradation efficiency reached 98.4% in 40 min by N-BC/PDS system. In particular, N-BC maintained excellent catalytic ability in both artificial and natural water conditions to efficiently degraded 2,4-DCP owing to its non-radical dominated degradation mechanism based on O 2 · - / 1 O 2 and electrons transferring. This study will expand biochar application and provide new insights for PDS activation to promote the non-radical oxidation of organic pollutants.
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CHEMOSPHERE
·
2022
·
IF 8.943
Zhuwu Jiang,Yuchang Wang,Hai Yu,Ning Yao,Jyunhong Shen,Yan Li,HongYu Zhang,Xue Bai
With the rapid development of drinking water disinfection technology , extensive attentions are paid to the nitrogenous disinfection by-products (N-DBPs) that has strong carcinogenicity , thus their degradation becomes important for the health of human beings. In this work, for the first time, CoFe-LDH material used as particle electrode is proposed to treat trace N-nitrosopyrrolidine (NPYR) in a three-dimensional aeration electrocatalysis reactor (3DAER). The factors on the degradation efficiency and energy consumption of NPYR are systematically investigated, and the results of radical quenching experiments show that the degradation of NPYR is completed by combining with ·OH, ·O 2 and direct oxidation together. CoFe-LDH particle electrode plays a vital role in generating ·OH via heterogeneous ‾Fenton-like reaction. Moreover, the adsorbed saturated CoFe-LDH particle electrode can be regenerated by electrochemical action to induce further recycle adsorption and form in-situ electrocatalysis. This work pave a way for the removal of NPYR with high efficiency, low energy conservation and environmental protection.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 12
·127518
·
IF 4.386
Ning Dai,Guohua Shi,Tingting Li,Nan Liu,Zhongkai Xu,Zhe Chen,Xiaohong Sun,Jiefang Sun,Ruisong Guo,Chunming Zheng
Dopamine is an important neurotransmitter for organisms and affects their function, so monitoring and detecting dopamine levels are essential. Sensitivity and selectivity of electrochemical sensors for the detection of dopamine usually rely on hybrid nanocomposites. In this context, we designed a micro-regionally restricted hybrid nanocomposite by modulating the micro-nano structure. Using functional groups on nitrogen-doped reduced graphene oxide (N-rGO) to restrict the random growth of tungsten disulfide nanosheets, we obtained a 2D layered material with bidirectional structural support to achieve high specific surface and high activity for application in robust and novel dopamine electrochemical sensors. A facile electrochemical sensor for dopamine detection was fabricated by modifying a screen-printed carbon electrode with the nanocomposite. The sensor exhibits excellent performance of dopamine detection in the wide range of 1 μmol l−1–100 μmol l−1 with a detection limit of 0.2 μmol l−1 and a high sensitivity of 0.56 μA μmol−1 l−1. The optimized sensor shows a good selectivity, satisfactory long-term stability and reproducibility towards DA and a separation of peak potential of 142 mV with uric acid. In addition, the prepared sensor provides favorable recovery in human serum and artificial cerebrospinal solution (aSCF), indicating great potentials in electrochemical detection and biological sensing applications.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zuqin Duan,Xue Wang,Richu Wei,Qian Lei,Honglin Chen
A facile novel B, N co-doped carbon was fabricated by high-temperature pyrolysis of a mixture of ethylenediamine tetraacetic acid disodium salt and boric acid, on which Pd nanoparticles were loaded to synthesize highly efficient Pd/BNC catalyst for dehydrogenation of formic acid. The type and content of N are regulated by the doping of B elements in carbon materials. The high content of N and B doping provides more anchor sites for Pd and strengthens the interaction between the support and Pd nanoparticles, thus forming highly dispersed Pd nanoparticles and regulating the electronic property of Pd. Therefore, the obtained Pd/BNC catalyst displayed enhanced performance (TOF = 2760 h −1 ) and a lower activation barrier (31.84 kJ/mol). Furthermore, the catalyst also exhibited wonderful cycling stability for hydrogen evolution from formic acid.
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Catalysts
·
2022
·Vol. 12
·期 12
·1658
·
IF 4.501
Rong-Kuan Jiang,Yue Pan,Li-Hua Du,Ling-Yan Zheng,Zhi-Kai Sheng,Shi-Yi Zhang,Hang Lin,Ao-Ying Zhang,Han-Jia Xie,Zhi-Kai Yang,Xi-Ping Luo
Benzimidazole scaffolds became an attractive subject due to their broad spectrum of pharmacological activities. In this work, a methodology was developed for the synthesis of N-substituted benzimidazole derivatives from benzimidazoles and α, β-unsaturated compounds (acrylonitriles, acrylate esters, phenyl vinyl sulfone) catalyzed by lipase TL IM fromThermomyces lanuginosusin continuous-flow microreactors. Investigations were conducted on reaction parameters such as solvent, substrate ratio, reaction temperature, reactant donor/acceptor structures, and reaction time. The transformation is promoted by inexpensive and readily available lipase in methanol at 45 °C for 35 min. A wide range of β-amino sulfone, β-amino nitrile, and β-amino carbonyl compounds were efficiently and selectively synthesized in high yields (76–97%). All in all, a microfluidic biocatalysis system was applied to the synthesis of N-substituted benzimidazole derivatives, and could serve as a promising fast synthesis strategy for further research to develop novel and highly potent active drugs.Keywords:enzymatic synthesis;benzimidazole derivatives;continuous-flow reaction technology;continuous-flow microreactor;aza-Michael addition
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Zhuoyue Liu,Ke Wang,Danyang Li,Zhenxin Wang,Shengjiong Yang,Heliang Pang,Gen Wang,Dahu Ding,Delu Miao
Mesoporous carbon materials are promising catalysts for peroxydisulfate (PDS) activation for degrading aqueous organic pollutants but limited by the intrinsic inertness. Herein, co-doping of iron and nitrogen into the mesoporous carbon framework was performed via thermal conversion of metal-polyphenol coordination polymers (Fe-TA) to synthesize Fe/N co-doped mesoporous carbon for efficient PDS activation. Owing to the large surface area, high graphitization degree and defective configurations, the Fe/N co-doped mesoporous carbon (Fe/N-MCs) exhibited superior catalytic performance toward the degradation of organic pollutants . Electron paramagnetic resonance tests, chemical quenching experiments, electrochemical analysis and spectra measurements revealed that the degradation of organic pollutants over the Fe/N-MCs followed a nonradical oxidation pathway based on electron transfer process. Graphite nitrogen and hydroxyl (C-OH) groups on the defective edges of Fe/N-MCs were proved to be possible active sites for PDS activation. PDS catalyzed by the Fe/N-MCs exhibited strong anti-interference capability to surrounding inorganic ions (such as Cl – , CO 3 2– , NO 3 – and SO 4 2– ) and natural organic matters, making it a promising candidate for the degradation of organic pollutants. This work provides a new prospect for developing highly active mesoporous carbon materials via heteroatom doping for PDS activation for wastewater decontamination .
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Journal of Experimental Nanoscience
·
2022
·
IF 2.024
Zhen-Hong He,Yuan-Yuan Wei,Na Li,Yong-Chang Sun,Shao-Yan Yang,Kuan Wang,Weitao Wang,Xiaoxue Ma,Zhao-Tie Liu
Chemical utilization of CO2 is one of the fundamental strategies to synthesize value-added chemicals and reduce the CO2 emission. N-formyl-1,2,3,4-tetrahydroisoquinoline derivatives (FTHIQs) are important chemicals for the synthesis of medical intermediates and alkaloids. N-formylation of isoquinoline derivatives (IQs) with CO2 is an ideal protocol to synthesize the FTHIQs and utilize the CO2 source. In the present work, we prepared a heterogeneous Ru/ZIF-8 catalyst with a Ru loading of 2 wt% by a simple impregnation method and assessed its performances in the N-formylation of IQs and CO2 with H2. The Ru/ZIF-8 catalyst offered high IQ conversion of 98% and FTHIQ selectivity of 93% in the reaction under relatively mild conditions (150 °C, 2 MPa CO2, and 6 MPa H2). The catalyst possessed good universality and reusability, showing a potential in wide application of N-formylation of highly unsaturated nitrogen-containing isoquinolines.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Meng Cheng,Junhao Liu,Hao Jiang,Chunling Li,Shuangqing Sun,Songqing Hu
In view of the critical importance of oxygen to corrosion evolution, to starve corrosion via depleting oxygen in coatings is a promising strategy. In this work, a novel nanocatalytic anticorrosion concept is proposed to design new coating with outstanding corrosion resistance . Different from the passive barrier of traditional coatings and self-repair after corrosion of current stimuli-feedback coatings, such coating could spontaneously eliminate internal diffused oxygen and greatly suppress the corrosion process. As a proof of concept, single-atom Fe-N-C electrocatalyst with isolated FeN 4 active sites is synthesized by a simple confined carbonization method, exhibiting excellent oxygen reduction performance (E 1/2 = 0.902 V). In composite coating , the evenly dispersed Fe-N-C compensates for the coating defects and serves as oxygen scavengers, which could actively adsorb and consume ambient oxygen, thereby preventing oxygen penetration to the metal substrate surface, eliminating the oxygen contribution to corrosion and significantly boosting the anticorrosion performance of epoxy coating. This in-situ mediation for oxygen in coating prevents metal substrate from receiving new supply of oxygen, while imparting active anticorrosion property to the coating.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yun-Liang Dai,Ao-Ping Guo,Mei-Hua Gong,Xiao-Juan Zhang,Bian-Ying Wen
Exploring highly efficient electromagnetic interference (EMI) shielding filler is urgently desired for next-generation wireless communication and integrated electronics. In this regard, a series of heterogeneous MoO 2 / N -doped carbon (MoO 2 /NC) nanorods with tunable conductivity have been successfully synthesized by regulating the pyrolysis temperature within 600, 700 and 800 °C. Profiting from the rational design of heterointerface and low-dimensional structure, the MoO 2 /NC powder achieves stronger EMI shielding capacity with the incremental temperature. It is found that the MoO 2 /NC-800 nanorods exhibit the optimal average EMI shielding effectiveness (SE) of 57.2 dB at a thickness of ∼0.3 mm in the X band. Meanwhile, the corresponding shielding mechanisms of MoO 2 /NC nanorods are also elaborately explained. More interestingly, the increase of sintering temperature makes an obvious effect on absorption loss but has little influence on reflection loss, demonstrating that adjusting the pyrolysis temperature is an effective strategy to strengthen the electromagnetic energy dissipation.
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高影响因子
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