Gels
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2023
·Vol. 9
·期 3
·190
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IF 4.6
Jiaxin Lu,Wenke Hao,Xiaodong Wu,Xiaodong Shen,Sheng Cui,Wenyan Shi
It remains a big challenge to develop non-precious metal catalysts for oxygen evolution reaction (OER) in energy storage and conversion systems. Herein, a facile and cost-effective strategy is employed to in situ prepare the Ni/Fe oxyhydroxide anchored on nitrogen-doped carbon aerogel (NiFeOx(OH)y@NCA) for OER electrocatalysis. The as-prepared electrocatalyst displays a typical aerogel porous structure composed of interconnected nanoparticles with a large BET specific surface area of 231.16 m2·g−1. In addition, the resulting NiFeOx(OH)y@NCA exhibits excellent OER performance with a low overpotential of 304 mV at 10 mA·cm−2, a small Tafel slope of 72 mV·dec−1, and excellent stability after 2000 CV cycles, which is superior to the commercial RuO2catalyst. The much enhanced OER performance is mainly derived from the abundant active sites, the high electrical conductivity of the Ni/Fe oxyhydroxide, and the efficient electronic transfer of the NCA structure. Density functional theory (DFT) calculations reveal that the introduction of the NCA regulates the surface electronic structure of Ni/Fe oxyhydroxide and increases the binding energy of intermediates as indicated by the d-band center theory. This work provides a new method for the construction of advanced aerogel-based materials for energy conversion and storage.Keywords:carbon aerogel;Ni/Fe oxyhydroxide;nitrogen doping;OER;DFT calculations
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JOURNAL OF SOLID STATE CHEMISTRY
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2023
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IF 3.3
Xu Zhang,Zeyu Song,Xiaochen Yu,Xiaoqian Dong,Yadi Peng,Kexin Wei,Leichao Cao,Xiao He,Zhehan Zhang,Jibin Fan
A heterostructured MIL-101(Fe)/Ce/g-C 3 N 4 (MCCN) composite was designed and synthesized by solvothermal method . The composite was characterized by XRD , SEM, EDS , FT-IR, BET, XPS , UV–Vis DRS , PL and EIS. The MCCN photocatalyst exhibits superior photocatalytic performance for the degradation of rhodamine B (RhB) and methylene blue (MB), and the efficiencies are found to be 90.36% and 88.17%, respectively. The kinetic constants k of MCCN-3 against RhB and MB dyes are 0.04094 min −1 and 0.03319 min −1 , respectively, under visible light for 75 min irradiation. The improved degradation efficiency of MCCN attributed to the enhanced light absorption and the transport channels of electron-hole pairs by forming a heterojunction between MIL-101(Fe) and Ce/g-C 3 N 4 with a favourable band position. Moreover, the possible mechanism of photocatalytic degradation of dyes was proposed though free radical trapping experiments. This work provides an effective way for constructing novel visible-light-driven photocatalyst in the removal of organic molecules from waste water .
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JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Jinzhe Li,Chuyun Fu,Qiufeng Lin,Tao Zeng,Da Wang,Xinwen Huang,Shuang Song,Cong Li,Feilong Dong
Ferrate (Fe(VI), FeO 4 2- ) has been widely used in the degradation of micropollutants with the advantages of high redox potential , no secondary pollution and inhibition of disinfection byproducts . However, the low transformation of Fe(V) and/or Fe(IV) by Fe(VI) and incomplete mineralization of pollutants limit their application. In this work, we designed a photo electric cell with TiO 2 nanotubes (TNTs) and Pt serving as the anode and cathode to enhance the utilization of Fe(VI) (Fe(VI)-TNTs system). TNTs accelerated the generation of •OH via h VB + oxidation of OH - and photogenerated electrons at Pt boosted the transformation of Fe(VI) to Fe(V) and/or Fe(IV), resulting in a 22.2 % enhancement of chloroquine (CLQ) removal compared to Fe(VI) alone. The results from EPR and quenching tests showed that Fe(VI), Fe(V), Fe(IV), •OH, O 2 •- and h VB + coexisted in the Fe(VI)-TNTs system, among which Fe(V) and Fe(IV) were testified as the primary reactive substances accounting for 59 % of CLQ removal. The performance tests and recycling tests demonstrated that the Fe(VI)-TNTs system maintained excellent performance in an authentic water environment. The plausible degradation pathway of CLQ oxidized in the Fe(VI)-TNTs system was proposed with nine identified oxidation products via N-C cleavage, electrophilic addition and carboxylation processes. Based on the ECOSAR calculation, the constructed reaction system allowed a decrease in acute and chronic toxicity. Our findings provide a highly efficient and cost-effective strategy to enhance Fe(VI) application for micropollutant degradation in the future.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Yan Wang,Ming Liu,Haibing Liu,Junhang Ding,Tian Wang,Jinfeng Dong,Bingbing Wang,Xing Tian,Yanzhi Xia
Search for anode materials for sodium ions batteries (SIBs) attracts researchers around the world because of their high-rate capability and excellent capacity. However, their stability needs to be improved. Thus, this work demonstrates a controllable method for the synthesis of one-dimensional (1D) hollow microfibers using “egg-box-structured” Fe-alginate fibers. The goal was to obtain an SIBs anode material with the optimal number of voids for efficient Na + storage. An optimized micro and pore structures were designed to obtain the shortest Na + -diffusion distance. The novel FeS 2 /Fe 2 O 3 -HF composite was able to withstand volume expansion during charge/discharge processes and showed high specificity and rate capacity (483 mAh/g at 100 mA/g, 241 mAh/g at 2000 mA/g). The capacity retention of this cell was excellent: it maintained 245 mAh/g over four hundred 1000 mA/g cycles. Thus, FeS 2 /Fe 2 O 3 -HF composite is a very promising active anode material for SIBs.
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Journal of Food Measurement and Characterization
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2023
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IF 3.4
Du Juan,Liu Kai,Liu Jialei,Zhao Dianbo,Bai Yanhong
Herein, a novel core-shell material Fe 3 O 4 @MIL-100(Fe) was synthesized for developing a novel LFIA by a two-step solvothermal method with good magnetic properties and high specific surface area. It was used as both magnetic separation and label agents in LFIA for the detection of Listeria monocytogenes . The enrichment of target bacteria can be achieved quickly and easily by direct adsorption of Fe 3 O 4 @MIL-100(Fe) on the bacteria and by the action of an applied magnetic field. It was beneficial in separation and concentration of target bacteria from food samples. The Fe 3 O 4 @MIL-100(Fe)-bacterial was then detected by the anti- Listeria monocytogenes antibody on the T line under the capillary action of the LFIA strip, resulting in the formation of a visible orange band. Under the optimal conditions, there was a good linear relationship between the intensity of the T line and the quantity of Listeria monocytogenes in the range of 10 5 -10 8 CFU mL − 1 , with a visual detection limit of 3.3 × 10 6 CFU mL − 1 . The strip showed strong specificity for L. monocytogenes , and the detection could be finished in 45 min, without the needing of pre-treatment. Thus, the proposed Fe 3 O 4 @MIL-100(Fe)-based strip was simple prepared, label-free, low cost, rapid and convenience.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jun Chen,Boding Zhang,Bingxing Wang,Chengxing Cui,Songlin Wang,Jichao Wang,Wenlong Zhang
With high toxicity, carcinogenicity and teratogenicity, quinoline has been threatening human health and ecological environment. Herein, Fe-Co-Ni-P/g-C 3 N 4 particles are developed as electrochemical reactors to form a three-dimensional catalytic particle electrode system (3D-CPE) for efficient removal of quinoline from wastewater by electro-Fenton (EF) oxidation process. with reaction time of 30 min, the particles dosage of 50 g/L, pH of 3, conductivity of 11.5 ms/cm, and current density of 37.04 mA/cm 2 , the chemical oxygen demand (COD) removal rate can up to 90.95%. In addition, electron paramagnetic response (EPR) and radical scavenging tests are performed to determine the hydroxyl radicals of electrochemical processes produced. The degradation products are analyzed by high performance liquid chromatography-mass spectrometry (HPLC-MS). Finally, through theoretical calculation and analysis of degradation products, a reasonable degradation mechanism is proposed.
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Catalysts
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2023
·Vol. 13
·期 6
·924
·
IF 3.9
Li Xu,Yuxuan Dong,Wei Xu,Wen Zhang
Preparing high-performance electrocatalysts for oxygen evolution reaction (OER)s with high durability for seawater electrolysis is of great significance. Herein, reported a one-step solution-immersion synthesis strategy to prepare a (Ni/Fe/Mo)OOH catalyst on a nickel foam substrate that can be accomplished in 5 min under ambient temperature and pressure. The unique cluster morphology of the catalyst on the surface of electrodes effectively increases the number of active sites, and the presence of Mo, Ni, and Fe in the catalyst enhances the activity of the OER. In the electrolyte solution (1 mol/L NaOH), the electrode exhibited low OER overpotentials of 265 mV, 286 mV, and 332 mV at currents of 100 mA·cm−2, 400 mA·cm−2, and 1000 mA·cm−2, respectively. This electrode also demonstrated excellent performance in seawater splitting, and the overpotentials at currents of 100 mA·cm−2, 400 mA·cm−2, and 1000 mA·cm−2in alkaline seawater environments were 330 mV, 416 mV, and 514 mV, respectively. In the 72 h durability test, the voltage increase was within 10 mV, exhibiting the excellent durability of the (Ni/Fe/Mo)OOH electrocatalyst. Therefore, the electrode developed here shows potential in the application of seawater electrolysis for hydrogen generation.Keywords:oxygen evolution reaction;(Ni/Fe/Mo)OOH catalyst;ultrafast and facile synthesis;alkaline seawater electrolysis
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Journal of Energy Storage
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2023
·
IF 9.4
Tao Xie,Guancheng Xu,Yong Yao,Peiyan Li,Wene Du,Hui Ding,Jiahui Jiang,Li Zhang
Metal-nitrogen doped carbon materials (M/NCs) exhibit considerable potential as electrocatalysts for oxygen reduction reaction (ORR) in novel energy conversion and storage devices. Herein, the Fe–N x doped porous carbon catalysts (FeN x PCs) with three-dimensional (3D) pore structure are synthesized by in situ pyrolyzation of polypyrrole-coated Fe 2 O 3 (Fe 2 O 3 @PPy). Fe 2 O 3 derived from the iron-formate framework (Fe-FF) is partially dissolved to generate Fe 3+ for driving polymerization and served as template to form the 3D structure during polymerization. FeN x PCs exhibit satisfactory long-term durability and superior ORR activity ( E 1/2 = 0.89 V) compared to commercial Pt/C. The Zn-air battery (ZAB) assembled with FeN x PCs reveals excellent battery performance, including a high open circuit voltage of 1.50 V, peak power density of 155.4 mW cm −2 , and cycling stability with 500 cycles. The excellent ORR activity of FeN x PCs could be ascribed to the porous structure , Fe–N x active sites, and high defect level of FeN x PCs. This strategy can modulate 3D porous structure via self-template synthesis, which provides a novel insight for development of high-performance air cathode catalyst.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiyang Kang,Ziqian Jin,Huaiqi Peng,Zihao Cheng,Lijie Liu,Xin Li,Lixia Xie,Jianmin Zhang,Yutao Dong
Lithium-sulfur (Li-S) batteries are currently only in the basic research stage and have not been commercialized, which is mainly affected by the poor conductivity of sulfur/lithium sulfide (S/Li 2 S), volume expansion effect of sulfur and the shuttle effect of lithium polysulfides (LiPSs). Herein, a three dimensional (3D) carbon nanotubes (CNTs) decorated cubic Co 9 Se 8−x /FeSe 2−y (0 ＜ x ＜ 8, 0 ＜ y ＜ 2) composite (Co 9 Se 8−x /FeSe 2−y @CNTs) is developed, and used as the functionalized mediator on polypropylene (PP) in Li-S batteries. Benefiting from the good electrical conductivity, large number of Se vacancies and the triple block/adsorption/catalytic effects of Co 9 Se 8−x /FeSe 2−y @CNTs, the cell with Co 9 Se 8−x /FeSe 2−y @CNTs//PP modified separator delivers a high reversible capacity (1103.5 mA h g −1 ) at 1C after three cycles activation at 0.5C and remains 446 mA g h −1 after 750 cycles with a 0.08% capacity decay rate each cycle. Moreover, at 0.2C, a high areal capacity of 3.63 mA h cm −2 after 100 cycles with a high sulfur loading of 4.1 mg cm −2 is obtained. The in-situ XRD tests revealing the transition path of α -S 8 → Li 2 S → β -S 8 during the first charge–discharge process, then β -S 8 → Li 2 S → β -S 8 conversion reaction in the next cycles, and firstly determine the sulfur-selenide active intermediates (Se 1.1 S 6.9 ) during cycles. The work provides a new insight into the development of bimetallic selenide composites by defect engineering with highly adsorptive and catalytic properties for Li-S batteries.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Feng-Di Tu,Zi-Yun Wu,Pan Guo,Li-Xiao Shen,Zi-Yu Zhang,Yun-Kun Dai,Miao Ma,Jing Liu,Bin Xu,Yun-Long Zhang,Lei Zhao,Zhen-Bo Wang
Platinum group metal (PGM)-free catalysts represented by nitrogen and iron co-doped carbon (Fe-N-C) catalysts are desirable and critical for metal-air batteries , but challenges still exist in performance and stability. Here, cerium oxides (CeO x ) are incorporated into a two-dimensional Fe-N-C catalyst (FeNC-Ce-950) via a host-guest strategy. The Ce 4+ /Ce 3+ redox system creates a large number of oxygen vacancies for rapid O 2 adsorption to accelerate the kinetics of oxygen reduction reaction (ORR). Consequently, the as-synthesized FeNC-Ce-950 catalyst exhibits a half-wave potential ( E 1/2 ) of 0.921 V and negligible decay (<2 mV for Δ E 1/2 ) after 5,000 accelerated durability cycles, significantly outperforming most of ORR catalysts reported in recent years and precious metal counterparts. When applied in a zinc-air battery, it demonstrates a peak power density of 175 mW cm −2 and a specific capacity of 757 mAh g Zn −1 . This study also provides a reference for the exploration of Fe-N-C catalysts decorated with variable valence metal oxides .
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TALANTA
·
2022
·
IF 6.556
Hao Feng,Fan Wang,Junhua Li,Qian Wu,Ying Cui,Lingzhi He,Xing Liu,Zeng Liu,Dong Qian,Haixia Tong
Lack of highly efficient, inexpensive, and easily available catalysts severely limits the practical applicability of electrochemically sensing assay towards 5-hydroxytryptamine (5-HT). Herein, four kinds of Fe–Co bimetallic Prussian blue analogues (FeCo–PBAs) with different molar ratios of Fe to Co were prepared using a simple coprecipitation method. Interestingly, Fe(III) in K 3 [Fe(CN) 6 ] can be reduced to Fe(II) by adding trisodium citrate dehydrate, which could offer a new clue to synthesize PBAs with Fe(II) core ions. With the optimizational FeCo-PBA synthesized at a 0.5/1 M ratio of Fe to Co as an electrocatalyst , the constructed sensor shows excellent comprehensive performance for the 5-HT assay with a high sensitivity of 0.856 μA μM −1 and an ultralow detection limit of 8.4 nM. Under the optimum conditions, linearity was obtained in the ranges of 0.1–10.0 μM and 10.0–200.0 μM and preferable recoveries ranged from 97.8% to 103.0% with relative standard deviation (RSD) < 4.0%. The integrated properties of FeCo-PBA can be comparable to previously reported electrocatalysts for the 5-HT assay including noble metal-based and expensive carbon (graphene and carbon nanotubes)-based electrocatalysts. The proposed sensor also exhibits outstanding selectivity, reproducibility, and practicality for real sample analyses. This work is the first report on the PBA-based sensor for the 5-HT assay, verifying the practicability of this high-performance sensor for the 5-HT assay.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Weirui Chen,Muxin Lin,Jiaxin Zhou,Xukai Li,Xipeng Wei,Gaozu Liao,Jing Wang,Laisheng Li
Lewis acid site was vital center for activating O 3 during catalytic ozonation process. Herein, we proposed a strategy to enhance the Lewis acid strength of Fe-MCM-48 (FeM) by fluorination. Fluorinated Fe-MCM-48 (FFeM) exhibited the better catalytic ozonation efficiency towards Ketoprofen (KET), a kind of nonsteroidal anti-inflammatory drug. 87.4 % TOC removal was obtained by F 2.5 Fe 0.8 M/O 3 process, but only 27.5 % and 52.7 % were found by sole ozonation and Fe 0.8 M/O 3 processes, respectively. Comparative characterizations, experiments and DFT calculations showed that fluorinated FFeM was regular sphere with three dimensional duct channel and large S BET . Doping of F reduced particle size, implanted electron withdrawing Si-F group and formed the electron poor center around Fe atom, which enhanced Lewis acid strength of FFeM. Protonated hydroxyl groups on Lewis acid sites were the main active sites for O 3 activation. Greater amount of O 3 were absorbed on the surface of FFeM and the greater O 3 utilization rate, •OH and •O 2 – generation rates were obtained by FFeM/O 3 process. Common anions such as Cl − , SO 4 2− and NO 3 – and Humic acids (HA) had little effect on KET removal but inhibited TOC removal in FFeM/O 3 process. •OH, •O 2 – and Fe(IV) = O oxidation were accounted for KET degradation. 16 kinds of intermediates generated from KET degradation and 4 pathways were deduced.
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