NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 17
·8271-8276
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IF 3.925
Ying-Xia Du,Lian Liu,Yong-Ke Li,Rui Liu,Wang-Ting Lu,Ji-Xiang Wang,Geng Zhang,Fei-Fei Cao
The preparation of two-dimensional (2D) composite material consisting of an active metal-based phase and carbon matrix is still a challenge. Herein, the 2D bimetal Co-TCPP(Fe) metal–organic framework (MOF) is synthesized and then adopted as the precursor to prepare a 2D composite electrocatalyst for the oxygen evolution reaction (OER). After carbonization and phosphorization, the 2D MOF is transformed into a composite nanoplate formed by Fe-doped CoP nanoparticles and a carbon matrix (Fe-CoP/C). This Fe-CoP/C composite exhibits a favorable OER performance in 1 M KOH with a low overpotential of 290 mV at 10 mA cm−2, which is better than that of counterparts without Fe and 2D morphology. The in situ formed metal (oxy)hydroxide is considered to be the main active species for the OER. The improved OER performance of Fe-CoP/C could be attributed to the Fe-doping in Co (oxy)hydroxide as well as the high electrochemical surface area induced by the 2D nanoplate morphology and conductive carbon network.
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Analytical Methods
·
2022
·Vol. 14
·期 25
·2541-2548
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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.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Chunxiao Zhang,Yingjie Li,Zirui He,Jianli Zhao,Dong Wang
Herein, a hollow microtubular Fe/Mn-promoted CaO-Ca 12 Al 14 O 33 bi-functional material was prepared by the bio-template method and used for H 2 production from sorption enhanced water gas shift (SEWGS). The microtubular Fe/Mn-promoted CaO-Ca 12 Al 14 O 33 exhibits excellent CO 2 capture and H 2 production performance in SEWGS/regeneration cycles. The stable hollow microtubular structure improves available adsorption and catalytic sites in Fe/Mn-promoted CaO-Ca 12 Al 14 O 33 for CO 2 capture and H 2 production. Mn addition improves CO 2 affinity capacity of the microtubular material. The Fe-Mn interaction increases redox ability of Fe 3+ /Fe 3+, 2+ , which promotes CO conversion. Moreover, the formed Ca 2 Fe 2 O 5 and Ca 2 MnO 4 both increase oxygen vacancies to promote catalytic activity of the microtubular material for WGS and its CO 2 capture capacity. The CO conversions for the microtubular material with the Fe/Mn/Al/Ca molar ratio= 10/2/10/100 are 98.7% and 94.0% after 20 cycles under the mild and severe calcination conditions, respectively. The hollow microtubular bi-functional material shows good prospect for efficient H 2 production from SEWGS.
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ELECTROCHIMICA ACTA
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2022
·
IF 7.336
Yingjie Zhou,Feifan Wei,Haihua Wu
Electrocatalytic CO 2 reduction in solid oxide electrolysis cells (SOECs) can simultaneously convert CO 2 to valuable chemicals or fuels by integrating with renewable energy so as to alleviate the greenhouse effects and energy crisis. Cerium oxide (CeO 2 ) with high redox stability and catalytic activity toward CO 2 reduction is considered a promising SOEC cathode. However, CeO 2 is rarely directly employed as cathodes due to its unsatisfactory electrical properties. Suitable modification of CeO 2 becomes essential to improve its electrocatalytic activity . Herein, Fe-decorated on Sm-doped CeO 2 via a simple mechanical milling process was employed as cathodes for high-temperature CO 2 electrolysis in SOEC. The addition of Fe species on Sm-doped CeO 2 can greatly enhance the CO 2 electrolysis efficiency, mainly attributing to the increased catalytic active sites, electronic pairs, and oxygen vacancy concentrations, which facilitated the CO 2 adsorption and dissociation as well as the electron-ion transportation. The 1.0 wt.% Fe-decoreated on Sm-doped CeO 2 showed the highest current density of 0.57 A cm −2 at 1.9 V under 800 °C. Moreover, the co-existence of doped and surface coated Fe species on Sm-doped CeO 2 with moderate oxygen vacancies and adequate electronic transportation paths facilitate the high-temperature CO 2 electrolysis.
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JOURNAL OF RARE EARTHS
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2022
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IF 4.632
Haining Song,Haifeng Zhou,Qianqian Zhuang,Zexin Li,Fenglei Sun,Zhenlei Yuan,Youxin Lou,Guangjun Zhou,Yujun Zhao
Oxidizing ClO − and IO 4 − exist widely in environment and are closely related to the health of organisms. Accordingly, fast, sensitive, and direct detection of the two species is significant. Using IFE in UCNPs @PAA and Fe(II)-phenanthroline system, an elegant ratiometric fluorescent nanosensor , without noble metal nanoparticle , was designed for the detection of ClO − and IO 4 − . Fe(II)-phenanthroline complex is used as fluorescent absorber, which can quench green light of UCNPs with gradually varied extent depending on the concentration of Fe(II). The linear zone extends to 800 and 120 μmol/L while the detection limit is 1.30 and 0.58 μmol/L for NaClO and NaIO 4 , respectively. Finally, the nanosensor was successfully applied to detect NaClO and NaIO 4 spiked in milk, spring water, and tap water with good recoveries.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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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.
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高影响因子
MATERIALS & DESIGN
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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.
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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.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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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.
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ACS Catalysis
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2022
·
IF 13.7
Yuting He,Xiaoxuan Yang,Yunsong Li,Liting Liu,Shengwu Guo,Chengyong Shu,Feng Liu,Yongning Liu,Qiang Tan,Gang Wu
Single-metal site catalysts have exhibited highly efficient electrocatalytic properties due to their unique coordination environments and adjustable local structures for reactant adsorption and electron transfer. They have been widely studied for many electrochemical reactions, including oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). However, it remains a significant challenge to realize high-efficiency bifunctional catalysis (ORR/OER) with single-metal-type active sites. Herein, we report atomically dispersed Fe–Co dual metal sites (FeCo–NC) derived from Fe and Co co-doped zeolitic imidazolate frameworks (ZIF-8s), aiming to build up multiple active sites for bifunctional ORR/OER catalysts. The atomically dispersed FeCo–NC catalyst shows excellent bifunctional catalytic activity in alkaline media for the ORR (E1/2 = 0.877 V) and the OER (Ej=10 = 1.579 V). Moreover, its outstanding stability during the ORR and the OER is comparable to noble-metal catalysts (Pt/C and RuO2). The atomic dispersion state, coordination structure, and the charge density difference of the dual metal site FeCo–NC were characterized and determined using advanced physical characterization and density functional theory (DFT) calculations. The FeCo–N6 moieties are likely the main active sites simultaneously for the ORR and the OER with improved performance relative to the traditional single Fe and Co site catalysts. We further incorporated the FeCo–NC catalyst into an air electrode for fabricating rechargeable and flexible Zn–air batteries, generating a superior power density (372 mW cm–2) and long-cycle (over 190 h) stability. This work would provide a method to design and synthesize atomically dispersed multi-metal site catalysts for advanced electrocatalysis.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Chenyan Wu,Qianhong Shen,Suhua Zheng,Xinyu Zhang,Jiansong Sheng,Hui Yang
A novel Bi 2 Sn 2 O 7 @MIL-100(Fe) composite photocatalyst was fabricated by loading Bi 2 Sn 2 O 7 nanoparticles on the surface of mesoporous MIL-100(Fe). The structure-property relationships of such composite photocatalyst were studied. The results exhibit that the formed Bi 2 Sn 2 O 7 @MIL-100(Fe) heterojunction promote the separation of photo-generated carriers, leading to the enrichment of photo-generated electrons on MIL-100(Fe). Meanwhile, MIL-100(Fe) can provide more active sites for photocatalytic reaction due to its extraordinary specific surface area. Therefore, the Bi 2 Sn 2 O 7 @MIL-100(Fe) composite photocatalyst exhibits excellent superoxide-radical-dominated photocatalytic activity and is more propitious to degrading the contaminants such as ciprofloxacin, which can be efficiently degraded in the absence of superoxide radicals. The Bi 2 Sn 2 O 7 @MIL-100(Fe) composite reveals enhanced photocatalytic activity for degrading ciprofloxacin with rate constant (0.0143 min −1 ) 1.96 and 3.86 times higher than that of pure MIL-100(Fe) (0.0073 min −1 ) and pure Bi 2 Sn 2 O 7 (0.0037 min −1 ), respectively.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
·
IF 10.319
Shuangqin Chen,Mai Li,Qingmin Ji,Tao Feng,Si Lan,KeFu Yao
Fe-based metallic glasses (Fe–MGs) are potential candidate catalysts for advanced oxidation processes (AOPs) for recalcitrant organic pollutant degradation. However, industrial wastewater and natural contaminated sites usually contain abundant inorganic ions, like the chloride ion (Cl − ), which significantly affect AOPs, but their influence on MG-activated AOPs still remains unclear. Through the study of three commonly used oxidants, hydrogen peroxide (H 2 O 2 ), peroxydisulfate (PDS), and peroxymonosulfate (PMS), the effect of Cl − on the FeSiB-catalyzed process of degradation of the typical azo dye Orange II was investigated. Evidence indicates that the addition of Cl − resulted in the monotonous inhibition of the degradation process when the H 2 O 2 /FeSiB and PDS/FeSiB systems were employed, but promoted effect was detected with the PMS/FeSiB system, which is different from the previously observed dual effect of Cl − . It is closely relative with FeSiB induced unique variety of degradation pathways, including radicals, non-radicals ( 1 O 2 ), and direct reduction degradation. Moreover, the presence of Cl − significantly affected the systems’ absorbable organic halogen content and the amount of Fe leached into the solution. The results of this work will provide essential references for Fe-based MG used as AOP catalysts in field applications and the development of advanced MGs with excellent adaptability to complex environments.
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