FUEL
·
2024
·
IF 6.7
Lan Xiao,Jian Wen,Guanghui Wu,Pinghua Chen,Mengxue Wang,Hualin Jiang,Xinming Zhou,Jianan Yan
Rational design of efficient and low-cost oxygen evolution reaction (OER) electrocatalysts is a key challenge in the development of various clean energy technologies. Here, flower-shaped FeCo-MOF-74/Mn-MOF-74 (FeCo/Mn mass ratio x:y, denoted as FCMx-y) electrocatalysts were synthesized through a two-step simple solvothermal methods and applied to the OER. These synthesized OER catalysts exhibited effective synergistic effects, high conductivity, electrochemical active surface area, carrier density, enhancing the intrinsic activity of MOF-74. Among them, the optimized FeCo-MOF-74/Mn-MOF-74 (named FCM1-2) required only a low overpotential of 280/382 mV to achieve 10/300 mA cm −2 in 1 mol/L KOH, outperforming control samples and commercial IrO 2 . Furthermore, the catalyst demonstrated high electrocatalytic activity, rapid catalytic kinetics, and excellent stability. This research provides a reference for the industrial design of advanced OER electrocatalysts with high current density for sustainable energy technologies.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Dingding Duan,Yaping Ding,Li Li,Guohong Ma
A high-performance melatonin sensing platform based on carbon nanofibers arrays decorated with FeCo alloys is described. A kind of carbon nanofiber based on FeCo bimetallic alloy was prepared by electrospinning. The synergistic effect of FeCo enhanced the electrocatalytic property and electron transfer ability of the materials. In addition, on the basis of the composite material, we study the electrooxidation behavior of melatonin and its reaction mechanism, and build a rapid succession of quantitative detection of melatonin electrochemical sensor with the detection range of 0.08–400 um and a detection limit as 2.7 nm. Compared to previous reports, this melatonin sensor possesses excellent properties and wide detection range.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yi-Cai Jiang,Meng-Fan Luo,Zi-Nuo Niu,Si-Yuan Xu,Yue Gao,Yuan Gao,Wen-Juan Gao,Jing-Jing Luo,Rui-Lin Liu
Magnetic carbon materials as the fascinating scavenger have been used for the purification of antibiotic wastewater. However, a majority of the reported magnetic carbon adsorbents suffer from the poor adsorption capacity and costly preparation costs. Herein, we report an in-situ growth of bimetallic FeCo-metal organic frameworks (MOFs) on waste paper-derived CoFe 2 O 4 /porous carbon via a hydrothermal strategy for reinforced clearance of tetracycline. The adsorption properties and mechanisms were systematically explored. Results revealed that the adsorption isotherms obeyed the Langmuir model, and the pseudo-second-order kinetics model could be well used to describe the current adsorption behavior. The maximum Langmuir adsorption capacity of FeCo-MOF@CoFe 2 O 4 /porous carbon toward tetracycline was calculated as 909 mg g −1 , which was significantly higher than that of other reported adsorbents. The ascendant capture property of the current adsorbent was presented under a wide pH range (5.0–12.0) and had excellent resistance to humic acid. In addition, the proposed coating method can also be applied to in-situ grow FeCo-MOF on biomass-derived magnetic porous carbon to enhance removal of tetracycline. Interestingly, the tetracycline adsorbed FeCo-MOF@CoFe 2 O 4 /porous carbon as a sustainable additive was further proved to be used for fruit preservation. Overall, this work provided a new research direction for in-situ architecture of magnetic carbon-based bimetallic MOF materials to treat antibiotic sewage and fruit preservation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 12
·2200494
·
IF 4.402
Shuoqi Wu,Pan Xu,Shan Wang,Desheng Qi,Le Wang,Lingcheng Meng,Shuyuan Ge,Xigui Yue
The preparation of the electromagnetic wave (EMW) absorbing materials with 3D porous structural, light weight, and high mechanical strength has been receiving greater attention for a long time. A series of light-weight polyetheretherketone/graphite/FeCo ternary heterogeneous composite foams (PEEK/C/FeCo) with high mechanical strength are prepared via thermally induced phase separation. Based on the high compressive strength of PEEK resin and its stable skeleton formed by thermally induced phase separation, the composite foam has high compressive strength and low density. In addition, during the thermally induced phase separation process, porous structures are formed inside the PEEK, and graphite and FeCo particles are uniformly dispersed between the pore structures, the composite foams possess excellent porous structure, moderate dielectric loss, and magnetic loss, exhibiting good absorbing properties. With the low density of 0.49 g cm −3 and high compressive strength of 6.40 MPa, the as-synthesized optimal sample (PEEK-50/C-40/FeCo-10) achieves a minimum reflection loss up to −35.9 dB covering a bandwidth of 3.6 GHz for a thickness of 1.5 mm. In a word, this study provides a novel, economical, and efficient way to obtain a light foam with high mechanical strength and good EMW absorbing property.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Xinqi Han,Zihan Lin,Xingquan He,Lili Cui,Dongxiao Lu
Here, Fe, Co-layered double hydroxide and polyaniline composites onto nickel foam (NF) (FeCo-LDH/PANI) were fabricated via one-step co-electrodeposition method. The test results indicate the co-existence of the amorphous structure and the smaller size of crystal district with more defects in optimal FeCo-LDH/PANI. Importantly, it is found that there are more defects in FeCo-LDH/PANI compared to that of FeCo-LDH possibly attributed to the local etching of H + released from the polymerization of aniline. Benefitting from the numerous defects, higher electrochemical surface area (ECSA), lower charge-transfer resistance and electron interaction, the optimized FeCo-LDH/PANI needs the overpotentials of 104, 246, 285 and 323 mV vs RHE for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) to achieve 10 and 100 mA cm −2 , and shows desirable stability. Noticeably, the optimal FeCo-LDH/PANI requires a cell voltage of 1.53 V to drive 10 mA cm −2 for the whole water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Tingting Liu,Sheng Cai,Zhihui Gao,Shuming Liu,Huani Li,Lijuan Chen,Mian Li,Hong Guo
This work reports the synthesis of novel cross-linked and functional porous carbon nanosheets (CNSs). The polyvinylpyrrolidone/transition metal acetates/N–N-dimethylformamide precursors are first woven into networks by electrospinning. The resultant precursor networks are transformed into the three-dimensional (3D) hierarchically porous material consisting of cross-linked and meso/macroporous CNSs ( i.e. , FeCo@NCNS) after pyrolysis . Characterization results prove that abundant ultrafine FeCo@NC units, N–C bonds, metal-nitrogen doped carbon (M-N-C) species and oxygen-containing functional groups disperse along the surfaces of the FeCo@NCNS, which act as electrocatalytic active sites for Oxygen reduction reaction (ORR) and Oxygen evolution reaction (OER). Due to the synergistic effect of the hierarchically porous structures and high-density active sites, the optimal FeCo@NCNS exhibits more positive onset potential (0.98 V relative to a reversible hydrogen electrode ( vs. RHE)) and half-wave potential (0.827 V vs. RHE) than Pt/C (0.97 V vs. RHE and 0.819 vs. RHE) for ORR. Meanwhile, the OER potential at 10 mA cm −2 of the FeCo@NCNS (1.597 V vs. RHE) is more negative than RuO 2 (1.631). Furthermore, the oxygen electrode activity (Δ E = E 10,OER - E 1/2,ORR ) of the FeCo@NCNS is as low as 0.772 V, which surpasses the state-of-the-art Pt/C(ORR)-RuO 2 (OER) catalyst combination (Δ E = 0.812 V). Experimental results prove that the FeCo@NCNS is among the best non-precious metal based bifunctional electrocatalyst for ORR and OER.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Dandan Zhu,Meijuan Chen,Yu Huang,Rong Li,Tingting Huang,Jun-ji Cao,Zhenxing Shen,Shun Cheng Lee
Formaldehyde is a typical indoor air pollutant that has posed severely adverse effects on human health. Herein, a novel FeCo alloy nanoparticle-embedded nitrogen-doped carbon (FeCo@NC) was synthesized with the aim of tailoring the transition-metal d-band structure toward an improved formaldehyde oxidation activity for the first time. A unique core@shell metal–organic frameworks (MOFs) architecture with a Fe-based Prussian blue analogue core and Co-containing zeolite imidazole framework shell was firstly fabricated. Then, Fe and Co ion alloying was readily achieved owing to the inherent MOF porosity and interionic nonequilibrium diffusion occurring during pyrolysis . High-angle annular dark-field scanning transmission electron microscopy and X-ray absorption fine structure spectra confirm that small FeCo alloys in situ form in FeCo@NC, which exhibits a higher formaldehyde removal efficiency (93%) than the monometallic Fe-based catalyst and a remarkable CO 2 selectivity (85%) at room temperature. Density functional theory calculations indicate the number of electrons transferred from the metal core to the outer carbon layer is altered by alloying Fe and Co. More importantly, a downshift in the d-band center relative to the Fermi level occurs from − 0.93 to − 1.04 eV after introducing Co, which could alleviate the adsorption of reaction intermediates and greatly improve the catalytic performance.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Xianshu Qiao,Hongjun Kang,Jinzhu Wu,Yang Li,Qun Wang,Xin Jia,Yadong Qiao,Songtao Lu,Xiaohong Wu,Wei Qin
We report a partial sulfidation approach that effectively boosts the OER activity of FeCo-layered double hydroxides (LDH). It is found that the mild sulfurized FeCo-LDH nanosheets using Na 2 S converted a portion of their surface metal-hydroxide bonds to metal-sulfur (-hydrosulfide) bonds without significantly altering their crystal structure. The sulfidation degree is controlled by Na 2 S concentration for obtaining a moderately surface electronic configurations. Benefits from the regulated electronic configurations, the sulfurized FeCo-LDH nanosheets only require an overpotential of 281 mV to produce oxygen at 10 mA cm −2 and their Tafel slope is 51.8 mV dec −1 , which are both lower than the 348 mV and 72.7 mV dec −1 of pristine FeCo-LDH nanosheets . The sulfurized catalysts have sustained 12 h of operation without notable activity loss. This work can provide new insights into understanding the roles of metal-sulfur bonds for OER and offer an attractive strategy to design low cost but efficient OER catalysts.
研究领域:
材料科学
·
电化学
·
催化作用
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 36
·18863-18871
·
IF 11.301
Ye Xiong,Lulu Xu,Caixia Yang,Qingfeng Sun,Xijin Xu
Adjusting the electromagnetic parameters by decorating magnetic particles for improved impedance matching is an important strategy for obtaining lightweight and efficient carbon-based electromagnetic wave-absorbing materials. In this work, a tomato-like hierarchical porous FeCo/C@WC was prepared for efficient microwave absorption, in which a lightweight anisotropic wood carbon aerogel (WC) was used as a structural assistant, and a MOF-derived graphitized carbon-coated FeCo alloy (FeCo/C) served as a dielectric/magnetic regulator. The tomato-like polystage micro-nano construction was made up of a “pericarp” left by the parallel channels of natural wood, a “pulp tissue” of the MOF-derived nanocage and “seeds” of FeCo nanoalloys embedded in a nanocage. The macroporous wooden shell and mesoporous carbon nanocage gave the composite an excellent hierarchical dielectric coupling network. Meanwhile, the uniformly dispersed FeCo nanoparticles enhanced the magnetic loss to the carbonaceous substrate, allowing for better impedance matching. As a result, the constructed multidimensional FeCo/C@WC exhibited superior wave absorbing ability, in which the maximum reflection loss (RL) reached −47.6 dB and the wide absorption bandwidth was up to 8.9 GHz. These excellent results confirmed that wood-based electromagnetic absorption devices may have a good application prospect.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Ming Ruan,Huajing Zhou,Lingxiang Zhao,Tianding Hu,Liang He,Shaoyun Shan
It is feasible to improve the photodegradation efficiency of organic pollutants by metal-organic frameworks (MOF)-based semiconductors via ligand engineering. In this work, three (Fe/Co)-XBDC-based MOFs were synthesized by introducing different ortho-functional groups X (X = –H, –NO 2 , –NH 2 ) next to the carboxyl group of the organic ligand (i.e., terephthalic acid). The analysis focused on the influence mechanism of the adjacent functional group effect of the ligand on the physicochemical properties of the material and the actual photodegradation activity of TC . Multiple pieces of evidences suggested that the differences in electron-induced and photocharge-transfer mechanisms of the above ortho functional groups affect the crystal morphology and photocatalytic activity of FeCo-MOF during pyrolysis . Interestingly, (Fe/Co)–NH 2 BDC exhibited the highest photocatalytic activity under neutral conditions. The results of density functional theory show that the introduction of a strong donor-NH 2 group can enhance light absorption and act as an “electron pump” to supply electrons to the iron center, accelerating the separation and efficient transport of photogenerated carriers on the ligand-metal bridge. In conclusion, this study is a proposal for a strategy of structural regulation for the enhancement of the catalytic activity of (Fe/Co)-MOFs in the photodegradation of TC.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 28
·8942-8949
·
IF 4.029
Zezhou Yang,Yun Zhu,Guangdi Nie,Meixuan Li,Ce Wang,Xiaofeng Lu
A simple and low cost detection of L-cysteine is essential in the fields of biosensors and medical diagnosis. In this study, we have developed a simple electrospinning, followed by calcination process to prepare FeCo nanoparticles embedded in carbon nanofibers (FeCo-CNFs) as an efficient peroxidase-like mimic for the detection of L-cysteine. FeCo nanoparticles are uniformly dispersed within CNFs, and their diameters are highly influenced by the calcination temperature. The calcination temperature also influences the peroxidase-like catalytic activity, and the maximum activity is achieved at a calcination temperature of 550 °C. Owing to the high catalytic activity of the as-prepared FeCo-CNFs, a colorimetric technique for the rapid and accurate determination of L-cysteine has been developed. The detection limit is about 0.15 μM with a wide linear range from 1 to 20 μM. In addition, a high selectivity for the detection of L-cysteine over other amino acids, glucose and common ions is achieved. This study provides a simple, rapid and sensitive sensing platform for the detection of L-cysteine, which is a promising candidate for potential applications in biosensing, medicine, environmental monitoring.
研究领域:
生物传感器
·
医学诊断
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Yu Wang,Guoxin Zhang,Mang Ma,Yiyan Wang,Ying Zhang,Xiaoming Sun,Zifeng Yan
Solid-phase templates are commonly used for building hollow-structured carbon materials (CMs) but often demand post treatments to remove templates. Herein, we develop an efficient and general method to construct hollow carbonaceous structure via the templating of sacrificial carbon nitride (termed as f-NC) without post treatment. The f-NC template can be decomposed under high-temperature annealing, additionally, it can serve as N source to enrich the N content. Applying f-NC template, we manage the synthesis of hollow-structured highly dispersed binary FeCo-nitrogen-carbon material (termed as f-NC@FeCo-NC). Its hollow feature is confirmed by direct observation using HRTEM . Meanwhile, Fe/Co in oxidation states have been verified uniformly distributing in heavily N-doped CMs (N content ∼ 13.2 at.%). The resulted f-NC@FeCo-NC, as examined by electrochemical measurements, exhibits highly efficient performance toward oxygen reduction reaction (ORR) in alkaline medium. It respectively shows much enhanced onset and half-wave potentials of 1.01 and 0.89 V relative to the FeCo-NC that is obtained without f-NC, in contrast, 20 wt% Pt/C shows 0.95 V onset potential and 0.83 V half-wave potential. The f-NC@FeCo-NC catalyst also shows excellent Al-air battery performance when applied as cathode, which possesses a high open circuit voltage of 1.91 V and a high peak power density of 241 mW cm −2 . We believe this sacrificial f-NC can be applied as general template for the fabrication of other hollow-structured carbon-based materials for broad electrochemical applications.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）