APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Yanping Chen,Lixuan Ma,Riguang Zhang,Runping Ye,Wei Liu,Jiatong Wei,Vitaly V. Ordomsky,Jian Liu
Alcohols are important chemicals, and are considered as high value-added products from Fischer–Tropsch synthesis (FTS). However, the unknown active sites and their unclear alcohol formation mechanism hinder the development of highly efficient catalysts. Herein, we report the design of low cost and scalable carbon-supported Fe (K-Fe/NC) catalyst with tailorable FTS selectivity via pyrolysis of Prussian Blue. Our K-Fe/NC catalyst exhibits alcohol selectivity as high as 30% containing 95% of C 2 -C 13 fraction. The K-Fe/NC catalyst with a core-shell structure facilitates the investigation of iron structural evolution in FTS. The CO dissociation and association are thoroughly verified through theoretical calculations and the temperature-programmed surface reaction of CO. The synergistic effect between χ–Fe 5 C 2 /ε-Fe 2 C and Fe 3 O 4 dual active sites is proposed for the alcohol formation mechanism. This work provides significant insight into the development of low cost and highly efficient iron-based catalysts for alcohols in FTS.
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Lina Zhang,Ying Zhang,Baikang Zhu,Jian Guo,Dongguang Wang,Zhongqi Cao,Lihui Chen,Luhui Wang,Chunyang Zhai,Hengcong Tao
Electrochemical CO2 reduction has been acknowledged as a hopeful tactic to alleviate environmental and global energy crises. Herein, we designed an Fe@C/g-C3N4 heterogeneous nanocomposite material by a simple one-pot method, which we applied to the electrocatalytic CO2 reduction reaction (ECR). Our optimized 20 mg-Fe@C/g-C3N4-1100 catalyst displays excellent performance for the ECR and a maximum Faradaic efficiency (FE) of 88% with a low overpotential of −0.38 V vs. RHE. The Tafel slope reveals that the first electron transfer, which involves a surface-adsorbed *COOH intermediate, is the rate-determining step for 20 mg-Fe@C/C3N4-1100 during the ECR. More precisely, the coordinating capability of the g-C3N4 framework and Fe@C species as a highly active site promote the intermediate product transmission. These results indicate that the combination of temperature adjustment and precursor optimization is key to facilitating the ECR of an iron-based catalyst.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Wenzhuo Zhang,Guangyi Chen,Yunyun Du,Shaoli Zhu,Jiancheng Zhang,Guangfei Liu,Feiyue Zhang,Shuai Wang,Xiaolong Wang
Reasonable optimization of the crystal structure and composite is an effective way to enhance the electrocatalytic activity of transition metal oxides. Herein, we report a strategy to fabricate Fe-doped amorphous CoOx (a-CoyFezOx) as an oxygen evolution reaction (OER) catalyst by a facile reduction reaction at room temperature. In a 1 M KOH electrolyte, the optimized a-Co2.5Fe0.5Ox catalyst shows the best OER activity. It only requires a 280 mV overpotential to achieve a current density of 10 mA cm–2 with a Tafel slope of 39.9 mV dec–1, which is even better than that of a commercial IrO2 catalyst. This high activity can be ascribed to the combined merits of the amorphous structure and the doped Fe element. The amorphous structure can enlarge the electrochemically accessible surface area and offer more active sites, while the Fe doped into the amorphous CoOx material can not only form the Fe site to promote the adsorption of intermediates during the OER process but also optimize the electronic structure of neighboring Co sites to enhance the OER activity. This work provides a strategy for rational design and large-scale synthesis of the transition metal oxide electrocatalysts to enhance the OER performance.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Wenqi Dong,Xueai Li,Huimin Tang,Kai Shi,Chunsheng Wang,Wanchun Guo,Kesong Tian,Haiyan Wang
The dielectric-magnetic synergistic effect can be achieved by dielectric relaxation and magnetic resonances in composites of carbon materials and magnetic particles. However, there is no direct evidence demonstrating the distribution of electromagnetic energy attenuation in the microstructure of composites. Herein, an amorphous carbon matrix with dispersed Fe/Fe 3 C@graphite-C was fabricated via a facile route. The distribution of the magnetic vector loss and electric vector loss in the hierarchical structures was revealed by numerical simulation. The content and dispersion of magnetic particles as well as the morphology of the amorphous carbon can be tuned. The 3D amorphous carbon matrix with highly dispersed Fe/Fe 3 C@graphite-C nanoparticles provided the strongest absorption of −69.0 dB and an effective response bandwidth (RL ≤ −10 dB) of 7.06 GHz. The numerical simulation revealed that the magnetic vector loss originated only from the core of Fe/Fe 3 C, and the electric vector loss was distributed throughout the structure, especially in the graphite-C shell, the interface between graphite-C and carbon nanoflakes, and the junction of different carbon nanoflakes. This work not only reveals the distribution of electromagnetic loss but also supports the theoretical analysis of the electromagnetic wave attenuation mechanism in composites, which provides direction for the future design of composites.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chengcheng Qi,Chongchao Zhang,Ziyin Yang
A novel strategy was reported to improve electrocatalytic activity of NiCo 2 O 4 by doping Fe. It is interesting to find that the doping of Fe induces formation of nanorod composing with crystalline core and thin amorphous shell. The composition, structure and properties of NiCo 2 O 4 are well characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry and amperometric method. The results display that the presence of thin amorphous shell is conducive to accelerating electron transfer rate and exposing more effective active sites, therefore making the sensor based on Fe-doped NiCo 2 O 4 detect glucose in a wide linear range from 0.2 μM to 3.1 mM with a high sensitivity of 3055.7 μA mM −1 cm −2 and a low detection limit of 0.19 μM. This unique crystalline core/amorphous shell-structured NiCo 2 O 4 demonstrates promising potential as an effective electrocatalyst for glucose sensing.
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 19
·3472
·
IF 5.719
Hongwei Tang,Mengyue Liu,Lingna Kong,Xiaoyan Wang,Yue Lei,Xige Li,Yan Hou,Kun Chang,Zhaorong Chang
In this paper, a series of Fe3O4/MoS2/NiS composite electrodes were synthesized by a simple coprecipitation method. The influence of different ratio additives (MoS2and NiS) on the performance of iron anodes for Ni-Fe batteries was systematically investigated. In this paper, the mixed alkaline solution of 6 mol/L NaOH and 0.6 mol/L LiOH was used as electrolyte, and sintered Ni(OH)2was used as counterelectrode. The experimental results show that the MoS2and NiS additives can effectively eliminate the passivation phenomena in iron electrodes, reduce the electrode polarization, and increase the reversibility capacity. As a result, the Fe3O4/MoS2/NiS composite electrodes exhibit a high specific capacity, good rate performance, and long cycling stability. Especially, the Fe3O4/MoS2(5%)/NiS (5%) electrode with a suitable ratio of additives can provide excellent electrochemical performance, with high discharge capacities of 657.9 mAh g−1, 639.8 mAh g−1, and 442.1 mAh g−1at 600 mA g−1, 1200 mA g−1, and 2400 mA g−1, respectively. This electrode also exhibits good cycling stability.Keywords:nickel-iron battery;iron anode;Fe3O4;sulfide additives
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Shurui Xu,Guoyu Zhong,Linxin Qu,Zihao Liang,Tao Li,Yifei Yuan,Shaona Zheng,Wenbo Liao,Abdul Waqas Anjum,Xiaobo Fu,Jing Xiao
Selectively oxidizing alcohols to carbonyl compounds in an eco-friendly and sustainable way is of great importance. Instead of the noble catalytic system, we developed a novel catalytic system based on drilled carbon nanotubes (CNTs) assisted by Fe(NO3)3 that exhibits high activity for aerobic oxidation reactions. Interestingly, our studies demonstrated a direct relationship between the defects in the drilled CNTs and their activity. Catalytic evaluations revealed that the synergistic effect of drilled CNTs combined with Fe(NO3)3 resulted in unprecedented activity. The edge defects of the CNTs and electron transformation of Fe work synergistically to activate O2. Furthermore, the electronic transition from the drilled CNTs to Fe3+ confirmed the synergistic effect of the drilled CNTs/Fe(NO3)3. Thus, our studies not only demonstrate the use of drilled CNTs/Fe(NO3)3 in a sustainable catalytic system but also provide insight into the synergistic effect between these components for the universal oxidation of alcohols to carbonyl compounds.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Minjie Xu,Chenxi Cao,Jing Xu
Direct CO 2 hydrogenation into linear α-olefins presents a promising route in carbon-neutral chemical manufacture. This work systematically investigated the variable interplay between Reverse Water-Gas Shift (RWGS) and Fischer-Tropsch Synthesis (FTS) during CO 2 hydrogenation using model Na-Fe 5 C 2 catalysts, combining dynamic/steady-state CO/CO 2 hydrogenation performance, intrinsic kinetics and multiple characterization results. Na-Fe 5 C 2 proves to be surface-enriched with FeO x sites over which RWGS readily proceeds. Meanwhile, CO 2 conversion under integral reaction conditions is limited by the subsequent FTS step due to a lack of available FeC x sites. The catalyst performance is steered by the properties and relative quantities of the two different active sites. Na addition promotes the refresh of FeO x sites and β-elimination of alkyl intermediates over FeC x sites, but at the cost of inhibiting the surface fraction of FeC x sites and thus the single-pass CO 2 conversion. These fundamental understandings will enlighten further development of CO 2 hydrogenation catalysts with improved hydrocarbon yields.
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 25
·2541-2548
·
IF 3.532
Lixia Su,Yonghuan Su,Bingqian Liu
A new ratiometric electrochemical strategy for immobilization-free detection of Escherichia coli (E. coli) was constructed by using a capture DNA-polyaniline/copper ferrite nanoparticles/graphene oxide (cDNA-PANI/CuFe2O4/GO) composite as capture probes, which has a high specific surface area and good magnetic properties. Then trigger DNA/Au nanoparticles (tDNA/Au NPs) were used as signal amplification labels, and Pt (IV) and Fe (III) were chosen as the signal probes. In the presence of targets, the sandwich format among cDNA-PANI/CuFe2O4/GO, E. coli and auxiliary DNA (aDNA) was realized by using the aptamer recognition system. Then, the tDNA/Au binding could be anchored on the sandwich format due to the principle of base complementation between unpaired aDNA and tDNA. And the unbounded tDNA of tDNA/Au NPs could bind an amount of Pt (IV). After separation using a magnet, a handful of unbound Pt (IV) which remained in the supernatant reacted with a large number of Fe (III) ions, leading to a markedly increased IFe(III)/IPt(IV) value. Oppositely, the sandwich format could not appear in the absence of targets, and even the tDNA/Au could not be immobilized on it. So, the redox reaction between a large amount of Pt (IV) residue in the supernatant and Fe (III) was significantly successful, causing a low IFe(III)/IPt(IV) value. Under optimal conditions, we found that IFe(III)/IPt(IV) was linearly related to the logarithmic E. coli concentration with a low limit of detection (1.862 × 103 cfu mL−1). This devised ratiometric electrochemical method may develop into a powerful and effective means for the detection of E. coli in real samples, which may also be developed as a universal tool for another microorganism.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Huaiyang Chen,Xiaoping Shen,Zhenyuan Ji,Jia Cheng,Guangxiang Liu,Leiming Lang,Yao Chen
In this paper, porous Mn 3 O 4 –Fe 3 O 4 nanoparticles with highly uniform composition are in-situ anchored on reduced graphene oxide (rGO) nanosheets by a simple cyanometallic framework template method . Thanks to the synergistic effects between the porous Mn 3 O 4 –Fe 3 O 4 nanoparticles and the well-conductive rGO nanosheets, the Mn 3 O 4 –Fe 3 O 4 /rGO composites present superior electrochemical lithium storage performances with a great reversible capacity of 1013 mAh g −1 after 100 cycles at 0.1 A g −1 , satisfactory rate capability of 510 mAh g −1 at 3.0 A g −1 , and eminent long-term cycle stability of 804 mAh g −1 after 500 cycles at 0.5 A g −1 . It is demonstrated that the rGO can not only act as a conducting matrix, but also buffer the volume expansion and avoid the aggregation of the Mn 3 O 4 –Fe 3 O 4 nanoparticles during charging-discharging. The work provides a simple strategy for designing and fabricating advanced multi-component metal oxide-based anodes for high-performance lithium-ion battery.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 52
·78874-78886
·
IF 5.19
Xu Junge,Hu Die,Wang Yingmu,Zhang Ziwei
Ciprofloxacin (CIP) is a third-generation fluoroquinolones (FQs) antibiotic, and the occurrence of CIP in the water environment has raised growing concerns owning to its environmental toxicity. In this paper, a novel α-(Fe, Cu)OOH/RGO nanocomposite was synthesized via a one-step reflux method for CIP degradation through a photo-Fenton-like process. When the RGO content was 1 wt%, CIP degradation ratio by the α-(Fe, Cu)OOH/RGO nanocomposite reached 100% under visible light irradiation within 120 min, and total organic carbon (TOC) removal ratio reached 60% within 180 min. The result of molecular fluorescence spectra highlighted that the loading of RGO on the α-(Fe, Cu)OOH significantly increased the content of hydroxyl radicals (·OH) in the heterogeneous photo-Fenton-like system and simultaneously inhibited the recombination of photogenerated electron and hole, which played critical roles in the enhancement of CIP degradation. In addition, 11 main intermediates were identified as the degradation products of CIP in the α-(Fe, Cu)OOH/RGO/H 2 O 2 /visible light reaction systems using liquid chromatograph–mass spectrometer (LC-MS) analyses. The results demonstrated that three degradation pathways for CIP removal by α-(Fe, Cu)OOH/RGO nanocomposite occurred, including (i) oxidation on the piperazine ring and dealkylation, (ii) defluorination and decarboxylation, and (iii) hydroxylation on the quinolone ring. This work would provide a novel insight of CIP degradation pathways in photo-Fenton-like processes. Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Ling Wu,Feng Li,Haidong Yu,Luping Shen,Mingxi Wang
Spectrophotometry is an economic and rapid method for detecting oxalic acid (OA), while the reported methods have some drawbacks, such as narrow linear range, long response time, delicate operation and required expensive reagents. Herein, we found that the as-synthesized Fe(III)-sulfosalicylate (FeSSA) could be used as an efficient colorimetric chemosensor to detect OA, and the established FeSSA-based fading spectrophotometry showed prominent advantages over the existing ones in detecting OA. The as-established method has wider linear range of 0.80–160 mg/L with regression coefficient ≥ 0.999, while the widest linear range is just 2.7–54 mg/L among the reported ones. Moreover, the method has low limit of detection (0.74 mg/L), extremely fast response (several seconds), satisfactory selectivity, high accuracy and precision. Most importantly, its reliability was further verified by employing it to determine OA concentration during the degradation process of organic pollutants. The measured OA concentration at any time interval was perfectly consistent with those determined by the well-recognized high performance liquid chromatography (HPLC). These confirmed that the FeSSA-based fading spectrophotometry is an efficient, simple, fast, accurate and economic method to determine OA in a wide concentration range.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）