INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2014
·Vol. 39
·期 28
·16179-16186
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IF 2.93
Hao Wang,Fengxiang Yin,Guoru Li,Biaohua Chen,Zhiqing Wang
A mixed metal–ion metal–organic framework (MOF(Fe/Co)) was synthesized by a hydrothermal process using ferric and cobalt salts as the metal–ion precursors and trimesic acid as the organic ligand. The structure of the as-prepared MOF(Fe/Co) was characterized by X-ray diffraction (XRD), N 2 adsorption–desorption, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and thermogravimetry/differential thermogravimetry (TG/DTG). The bifunctional catalytic activities of MOF(Fe/Co) toward the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) in alkaline electrolyte were investigated by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). The results demonstrate that the as-prepared MOF(Fe/Co) has a good crystalline structure with abundant micropores , a high specific surface area and a high thermal stability. The MOF(Fe/Co) exhibits excellent bifunctional catalytic activities for OER and ORR. The high specific surface area and abundant micropores are beneficial for oxygen diffusion and catalytic sites utilization in the catalyst, which is favorable for the OER and ORR. The RDE results for MOF(Fe/Co)-catalyzed ORR indicate that the two-electron pathway was preferred at relatively positive potentials, whereas the four-electron pathway gradually dominated at more negative potentials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Ying Ji,Honglei Liu,Yujiao Guo,Junming Guo,Mingwu Xiang,Wei Bai,Xiaofang Liu,Hongli Bai
At high current density, low capacity and rapid capacity decay of spinel LiMn 2 O 4 cathode material during the cycle limit its application. Herein, element doping approach to restrain Jahn-teller effect combined with crystal plane regulation to mitigate Mn dissolution is employed to synthesize a series of truncated octahedron LiNi 0.02 Fe x Mn 1.98−x O 4 (x ≤ 0.12) which provide high exposure {111} surfaces as well as a small portion of {110} and {100} facets for offering Li + ion rapid diffusion channel. Many characterizations such as XRD , SEM and TEM show that Ni-Fe co-doped can effectively promote the development of crystal and the preferential growth of crystals planes. Electrochemical test results imply that at 1 C the difference between capacity and capacity retention ratio in terms of LiNi 0.02 Mn 1.98 O 4 (LNMO) and Ni-Fe co-doping samples are not obvious. With the increasing of current densities, Ni-Fe co-doping samples exceptional rate capability and cycle stability become apparent. The optimal LiNi 0.02 Fe 0.05 Mn 1.93 O 4 (LNFMO-5) and LNMO can keep 76.9% and 74.6% of their original capacity of 113.4 mAh·g ‐1 as well as 116.2 mAh·g ‐1 after 500 cycles at 1 C, respectively. At 10 C, the LNFMO-5 sample delivers the capacity of 89.3 mAh·g ‐1 and a higher capacity retention ratio of 72.9% after 2000 cycles, while the LNMO sample is only 63 mAh·g ‐1 and 67.2%. Even at 20 C, The LNFMO-5 sample still reaches a high specific capacity of 84.9 mAh·g ‐1 and a higher capacity retention ratio of 76.1% after 2000 cycles, which are much higher than the LNMO sample (63.0 mAh·g ‐1 ) and 57.4% capacity retention rate. CV and EIS analysis manifest that the LNFMO-5 has a higher D Li + and a lower E a than that of the LNMO. A unique Ni-Fe co-doped truncated octahedral LiMn 2 O 4 material with exceptional electrochemical property will be an attractive candidate for the preparation high-performance and long-cycle spinel LiMn 2 O 4 cathode materials.
研究领域:
材料科学
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电化学
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储能技术
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锂离子电池
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正极材料
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xiaoqiang Li,Xiaorui Zhang,Xin Zhang,Shengjun Wen,Xiaoxiao Duan,Yongsheng Ren
2-Mercaptobenzothiazole (MBT), a highly toxic industrial corrosion inhibitor containing a thiol group, poses severe threats to ecological and human health. In this study, a trimetallic cathode (FeCoMn@LNC-500) was fabricated by in situ growing oxygen-vacancy-rich FeCoMn-LDHs on carbon paper followed by carbonization at 500 °C. FeCoMn@LNC-500 exhibited a cylindrical fiber-rod structure decorated with numerous densely aggregated spherical particles, which increased the electrochemical active surface area and reduced the charge-transfer resistance. Under optimal conditions, FeCoMn@LNC-500/EF achieves a degradation rate of 100% within 70 min through singlet oxygen ( 1 O₂) mediated non-radical oxidation (k = 0.0557 min −1 ). The removal efficiency achieved with this cathode was approximately 11.8, 5.0, 2.0, and 3.2 times higher than those of the PC-500, FeMn@LNC-500, CoMn@LNC-500, and CoFe@LNC-500 cathode systems, respectively. The outstanding degradation performance is primarily attributed to the carbon paper's excellent conductivity, which enhances the in-situ synergistic cycling of Co, Fe, and Mn to accelerate the Fenton reaction while also improving system stability, as demonstrated by a 7-cycle operational test and the detection of extremely low metal-ion leaching. Quenching experiments and electron paramagnetic resonance (EPR) spectroscopy confirmed that the non-radical 1 O₂ played a dominant role in the oxidation process. HPLC-MS analysis revealed the degradation mechanism and pathway of MBT: non-radical-dominated selective cleavage of the S N bond followed by stepwise mineralization. The carbon-paper-based cathode developed in this work provides insights into the electro-Fenton degradation of thiol-containing wastewater and is expected to offer a new strategy for the efficient treatment of coal-chemical pipeline wastewater.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2026
·Vol. 41
·期 2
·353-363
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IF 1.4
Yan Ming,Deng Yuxiao,Yan Zhuanlong,Li Hongyu,Cao Mengyang
This study reported the synthesis of magnetic solid solutions V 2 (A x B y Sn 1− x − y )C (where A and B are Mn, Fe, or Co) MAX phases. These materials were prepared by incorporating magnetic elements into the V 2 SnC MAX phase via pressure-less sintering at 1 000 °C for 3 hours. XRD analysis reveals that the composition with x = y = 0.2 exhibits a shift of diffraction peaks to higher angles, indicating lattice parameter changes, and achieves the highest phase purity with the maximum solid solution limit, further increases in the dopant content led to the formation of impurities. While the solid solution of magnetic elements preserves the characteristic layered structure of the MAX phase, it successfully induces magnetic properties. The magnetic transition temperatures for these solid solutions ranges from 61 to 200 K. Specifically, V 2 (Mn x Co y Sn 1− x − y )C demonstrated hard magnetic characteristics, with a high saturation magnetization (6.536 emu/g) and large remanence (4.236 emu/g). In contrast, V 2 (Mn x Fe y Sn 1− x − y )C and V 2 (Fe x Co y Sn 1− x − y )C exhibits soft magnetic behavior, evidenced by their narrow hysteresis loops and low coercivity. Their saturation magnetization values are 3.80 and 1.784 emu/g, respectively. The distinctly “S”-shaped hysteresis loop of V 2 (Fe x Co y Sn 1− x − y )C further confirms its soft magnetic nature.
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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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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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PubMed
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 13
·135502
·
IF 3.953
Hui Shu,Tingrun Lai,Jie Ren,Xiuxiu Cui,Xu Tian,Zhichao Yang,Xuechun Xiao,Yude Wang
The excessive use of imidacloprid in agricultural production leads to a large number of residues that seriously threaten human health. Therefore, the detection of imidacloprid has become very important. But how to quantitatively detect imidacloprid at ultra-low levels is the main challenges. In this work, trimetallic metal-organic frameworks Fe, Co, Ni-MOF (FCN-MOF) is in situ prepared on nickel foam (NF) and then used to make an electrochemical sensor in the detection of imidacloprid. FCN-MOF exhibits the characteristics of ultra-micro concentration detection for imidacloprid with high specific surface area and rich active metal centers. The high conductivity and 3D skeleton structure of the NF electrode enhance the contact site with imidacloprid and promote the transmission of electrons efficiently. All results show that the prepared electrochemical sensor has the advantages of ultra-low detection limits (0.1 pM), wide linear detection ranges (1–5 × 107 pM) and good sensitivity (132.91 μA pM‒1 cm‒2), as well as good reproducibility, excellent anti-interference ability, and fantastic stability. Meanwhile, the electrochemical sensor is used to determine imidacloprid in lettuce, tomato, and cucumber samples with excellent recovery (90%–102.7%). The novel electrochemical sensor is successfully applied to the ultra-micro detection of imidacloprid in vegetables, which provides a new way for the efficient monitoring of imidacloprid in agriculture.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Liying Wu,Zhiqiang Sun,Yufei Zhen,Shishu Zhu,Chen Yang,Jing Lu,Yu Tian,Dan Zhong,Jun Ma
Ubiquitous oxygen vacancies (Vo) existing in metallic compounds can activate peroxymonosulfate (PMS) for water treatment. However, under environmental conditions, especially oxygenated surroundings, the interactions between Vo and PMS as well as the organics degradation mechanism are still ambiguous. In this study, we provide a novel insight into the PMS activation mechanism over Vo-containing Fe–Co layered double hydroxide (LDH). Experimental results show that Vo/PMS is capable of selective degradation of organics via a single-electron-transfer nonradical pathway. Moreover, O2 is firstly demonstrated as the most critical trigger in this system. Mechanistic studies reveal that, with abundant electrons confined in the vacant electron orbitals of Vo, O2 is thermodynamically enabled to capture electrons from Vo to form O2•– under the imprinting effect and start the activation process. Simultaneously, Vo becomes electron-deficient and withdraws the electrons from organics to sustain the electrostatic balance and achieve organics degradation (32% for Bisphenol A without PMS). Different from conventional PMS activation, under the collaboration of kinetics and thermodynamics, PMS is endowed with the ability to donate electrons to Vo as a reductant other than an oxidant to form 1O2. In this case, 1O2 and O2•– act as the indispensable intermediate species to accelerate the circulation of O2 (as high as 14.3 mg/L) in the micro area around Vo, and promote this nano-confinement electron-recycling process with 67% improvement of Bisphenol A degradation. This study provides a brand-new perspective for the nonradical mechanism of PMS activation over Vo-containing metallic compounds in natural environments.
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Advanced Science
·
2021
·Vol. 9
·期 4
·2104237
·
IF 16.806
Qinglin Han,Ximeng Zhao,Yuhong Luo,Lanlan Wu,Shujuan Sun,Jingde Li,Yanji Wang,Guihua Liu,Zhongwei Chen
Rational design of metal oxide supported non-precious metals is essential for the development of stable and high-efficiency oxygen reduction reaction (ORR) electrocatalysts. Here, an efficient ORR catalyst consisting of binary Fe/Co nanoclusters supported by defective tungsten oxide and embedded N-doped carbon layer (NC) with a 3D ordered macroporous architecture (3DOM Fe/Co@NC-WO 2− x ) is developed. The oxygen deficient 3DOM WO 2− x not only serves as a porous and stable support, but also enhances the conductivity and ensures good dispersion of the binary Fe/Co nanocluster, benefiting its ORR catalytic activity. Theoretical calculation shows that there exists a synergistic effect of electron transfer from Fe to Co in the supported binary Fe/Co cluster, promoting the ORR reaction energetics. Accordingly, the 3DOM Fe/Co@NC-WO 2− x catalyst exhibits excellent ORR activity in alkaline medium with a half wave potential ( E 1/2 ) of 0.87 V higher than that of Pt/C (0.85 V). The zinc–air batteries assembled by 3DOM Fe/Co@NC-WO 2− x cathode deliver a higher power density and specific capacity than that of Pt/C. A new strategy of combining synergistic binary-metal nanoclusters and conductive metal oxide support design is provided here to develop efficient and durable ORR electrocatalyst.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yong He,Xiao Kang,Hui-wen Xiong,Lei Zhang
Spinel composite is being considered for electrode materials in molten salt electrolysis, aiming to improve high-temperature stability and conductivity. Multi-phase composites with the general formula of (Fe 1-3 x - y Ni y Co x Cr x Mn x ) 3 O 4 ( x = 0.03, 0.06, 0.09, y = [1-2 x ]/3) were prepared via in situ SPS method. The composites were confirmed to consist of spinel and rock-salt phases through XRD and SEM analysis. Compared to the Ni–Fe–O system, the doping of Cr, Mn and Co improved the phase stability of the spinel during SPS, but hindered the shrinkage process. These composite exhibited low thermal diffusivity (1.236–2.481 m 2 /s, room temperature) and low coefficient of thermal expansion (9.8 - 14.4 × 10 −6 K −1 , 400–800 °C). Moreover, the composite with x = 0.06 and y = 0.29 exhibit 94.4 % lower permittivity, 7 times higher dielectric loss (at 40 Hz) and 26.6 % lower high-temperature conductivity (at 800 °C) than that of Ni–Fe–O system. This work demonstrates the enhanced thermal and electrical properties of spinel-based composites, which can provide inspiration to researchers and promote the development of high-temperature electrodes.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 35
·9031-9037
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IF 5.236
Yibo Zhang,Yuying Zheng,Hongbo Geng,Yang Yang,Minghui Ye,Yufei Zhang,Cheng Chao Li
Graphical Novel structured M 2 P 2 O 7 /C (M=Fe, Co, Ni) nanoflake composites are prepared via an organic-phosphors precursor assisted solvothermal method and a post high temperature annealing process, which could deliver superior potassium storage performance. Metal phosphates have been widely explored in lithium ion batteries and sodium ion batteries owing to high theoretical capacities, mild toxicity and low cost. However, their potassium ion battery applications are less reported due to the limited conductivity and the slow diffusion kinetics. Considering these drawbacks, novel structured M 2 P 2 O 7 /C (M=Fe, Co, Ni) nanoflake composites are prepared through an organic-phosphors precursor-assisted solvothermal method and a subsequent high temperature annealing process. The designed Co 2 P 2 O 7 /C composite exhibits the highest rate capacity with 502 mAh g −1 at 0.1 A g −1 and good cyclability for 900 cycles at 1 A g −1 and 2 A g −1 when compared with Ni and Fe based composites. The superior electrochemical performance can be attributed to their unique nanoparticle-assembled nanoflake structure, which can afford enough active sites for K + intercalation. In addition, the robust pyrophosphate crystal structure and the in situ formed carbon composition also have positive effects on enhancing the long-term cycling performance and the electrode's conductivity. Finally, this organic-phosphors precursor induced simple approach can be applied for easy fabrication of other pyrophosphate/carbon hybrids as advanced electrodes.
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Journal of Saudi Chemical Society
·
2016
·
IF 1.978
Yingting Wang,Jiangfeng Huang,Xiaomeng Xia,Xinhua Peng
A highly efficient catalyst Fe–Co/sulfonated polystyrene (Fe–Co/SPS) was introduced and synthesized, which catalyzed BV oxidation of ketones with aqueous hydrogen peroxide to give the corresponding lactones in high yield and selectivity. Solid acid catalyst of Fe–Co/SPS has been prepared by using the 98-wt% sulfuric acid as the sulfonating agent and CoCl 2 combined FeCl 3 as sources of metal ions. Various physical–chemical characterizations including FT-IR, XRD, SEM and TGA, revealed that bimetallic ions Fe 3+ –Co 2+ species in the sulfonated polystyrene framework were responsible for the catalytic activities. The BV reaction catalyzed by Fe–Co/SPS highlighted the special effects between metal ions and protonic acids as well as solvent-free heterogeneous catalytic oxidation with excellent conversion.
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