CARBON
·
2019
·
IF 7.466
Yu-Jiao Zhang,Jin Qu,Qiu-Yu Ji,Ting-Ting Zhang,Wei Chang,Shu-Meng Hao,Zhong-Zhen Yu
The loss and sluggish kinetics of intermediate polysulfides in electrochemical processes seriously reduce electrochemical activity of sulfur in lithium-sulfur batteries (LSBs). Herein, we design and synthesize freestanding graphitized carbon interlayers decorated with Fe/Fe 3 C nanocatalysts by thermal treatment of cellulose paper with adsorbed ferric nitrate at 1000 °C, during which the freestanding carbon network derives from the cellulose paper while the Fe results from the reduction of Fe 3+ with a carbothermal reduction process; simultaneously, the in situ formed Fe boosts graphitization of carbon to enhance electrical conductivity of the interlayer, and the carbon network effectively helps confine and accommodate Fe/Fe 3 C nanoparticles . Therefore, the well dispersed Fe/Fe 3 C nanoparticles catalytically accelerate electrochemical conversion of polysulfides, while the enhanced conductive network of carbon benefits the electron transfer during the electrocatalytic process. The cell with an optimal carbon/Fe/Fe 3 C interlayer delivers excellent cyclability and rate performances. At current densities of 0.2C and 2C, the specific capacities are close to 1000 and 735 mA h g −1 , respectively. Even after 200 cycles at 1C, the reversible specific capacity is still 772 mA h g −1 . Such a synergistic catalytic interlayer with an enhanced conversion kinetic towards polysulfides provides a new approach for improving electrochemical performances of LSBs.
研究领域:
材料科学
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电化学
·
能量存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xinwei Zhu,Jimin Shen,Jing Kang,Pengwei Yan,Lei Yuan,Yizhen Cheng,Binyuan Wang,Shengxin Zhao,Zhonglin Chen
Developing highly efficient and anti-interference catalysts was still a challenge for the practical application of heterogeneous catalytic ozonation (HCO) in water decontamination. Herein, a magnetic Fe 3 C decorated biochar (Fe 3 C/BC) was prepared for HCO to achieve efficient degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). The Fe 3 C/BC catalytic ozonation system promoted the degradation ratio of 2,4-D from 58.7% (ozonation alone) to 90.0% within 10 mins when the ozone dosage was 1.0 mg/L. And the observed degradation rate constant ( k obs ) of 2,4-D under catalytic ozonation system was 2.58 times that of ozonation alone. Fe 3 C/BC exhibited negligible adsorption on 2,4-D but with a significant enrichment to ozone, which realized the cooperating process of “adsorption-catalysis” at the solid–liquid interface, thus avoiding the ineffective decomposition of ozone. The dissociative adsorption of ozone molecules on the surface Fe 3 C generated surface atomic oxygen species (O* and O 2 *), which mediated the in-situ formation of hydroxyl radicals (·OH). ATR-FTIR, in-situ Raman, isotope tracing tests, and theoretical calculations were used to disclose the interface reaction processes and reveal the ·OH formation mechanism. Free radical reactions at the interface efficiently avoid the interference of coexisting ions dissolved in water. The presence of 3 mM (183 mg/L) bicarbonate had essentially little effect on the degradation of 2,4-D. The consecutive use of Fe 3 C/BC did not influence its catalytic performance and stable structure. This study provided new insight into the ·OH-dominated interfacial reaction in the HCO process.
研究领域:
环境科学
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水处理
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催化
·
高级氧化过程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Tingli Ren,Yuanfeng Liu,Xiaoqiu Lin,Congju Li
Microbial fuel cells (MFCs) demonstrate significant potential as renewable energy devices due to their ability to harvest electrical energy from wastewater. However, sluggish extracellular electron transfer (EET) efficiency and poor biofilm colonization on the anode interface greatly restrict the power generation of MFCs. Anchoring efficient anode electrocatalysts over the anode surface has been proven to be a powerful strategy to enhance the overall performance of MFCs. Herein, anode electrocatalysts comprising carbon nanofibers in situ-doped with Fe/Fe3C nanoparticles and reduced graphene oxide (rGO/NCNFs@Fe/Fe3C) were fabricated through electrospinning, carbonization, and freeze-drying methods, based on the following considerations: (i) the excellent electrocatalytic properties and biocompatibility of Fe3C; (ii) the formation of abundant reactive sites (such as Fe–N) on the surface of carbon nanofibers induced by the doping of N and Fe elements; (iii) the aerogel structure with a huge specific surface area and excellent electrochemical properties. Therefore, an MFC with an rGO/NCNFs@Fe/Fe3C-modified anode achieved a maximum power density of 2318 mW m−2 and a maximum output voltage of approximately 0.64 V, which was significantly superior to that of the pristine carbon cloth anode. This work provides a novel strategy to improve biofilm colonization and EET, thus promoting the power generation of MFCs.
研究领域:
材料科学
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环境工程
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电化学
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生物技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 6
·3835-3842
·
IF 3.9
Tanlun Wang,Lincheng Xu,Chenxiang Sun,Xiyuan Li,Yong Yan,Fan Li
Fe–N–C has a high number of FeNx active sites and has thus been regarded as a high-performance oxygen reduction reaction (ORR) catalyst, and combining Fe3C with Fe–N–C typically boosts ORR activity. However, the catalytic mechanism remains unknown, limiting further research and development. In this study, a precipitation-solvothermal process was used in conjunction with pyrolysis to produce a series of Fe–N–C catalysts derived from a zeolitic imidazolate framework (ZIF) that was composited with Fe3C. The prepared catalysts had a multiscale structure of ZIF-like carbon particles and rod-like structures, as well as bamboo-like carbon nanotubes (CNTs) and carbon layers wrapped with Fe3C particles while a series of studies revealed the origin of the rod-like structures and Fe3C phase. The hierarchical structure was beneficial to the enhanced electrocatalytic performance of catalysts for ORR. The optimal sample had the highest half-wave potential of 0.878 V vs. RHE, which was higher than that of commercial Pt/C (0.861 V vs. RHE). The ECSA of the optimal sample was 1.08 cm2 μg−1, with an electron transfer number close to 4, and functioning kinetics. The optimal sample exhibited high durability and methanol tolerance for the ORR. Finally, blocking different Fe active sites with coordination ions demonstrated that Fe(II) was the main active site, indicating that Fe3C primarily served as a cocatalyst to optimize the electron structure of Fe–N–C, thereby synergistically improving the ORR activity.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Chao Zhang,Mengxiang Ye,Huaimeng Li,Zhenzhen Liu,Zhen Fu,Haimin Zhang,Guozhong Wang,Yunxia Zhang
Heterogeneous electro-Fenton is a promising technology for the degradation of organic contaminants. To ensure its effectiveness, it is in urgent demand to design cathode materials with the integrated capability of sufficient H 2 O 2 generation and subsequent activation into reactive oxygen species (ROS) together with catalytic stability. Herein, a composite constituted by Fe/Fe 3 C nanoparticles embedded into N-doped porous carbon (NPC), designated as Fe/Fe 3 C@NPC, was successfully fabricated from Fe 3+ -loaded poly(imine dioxime) (PIDO) membrane via the thermal treatment in N 2 atmosphere and employed as the heterogeneous electro-Fenton catalyst to degrade bisphenol A (BPA). By optimizing the pyrolysis temperature and loading level of iron species, the catalyst obtained at 800 °C (i.e. Fe/Fe 3 C@NPC-800) achieved almost 100% of BPA removal efficiency within 120 min via the electro-Fenton system, accompanied by 69.2% of the total organic carbon (TOC) removal rate. Furthermore, the proposed composite catalyst also exhibited satisfactory reusability and stability, as reflected by low decrease in removal efficiency after six successive degradation tests and limited iron leaching (<0.5 mg/L). This work might provide valuable instruction for the rational design of highly efficient and stable heterogeneous electro-Fenton catalysts for organic pollutant control.
研究领域:
环境科学
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催化
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水处理
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qingfu Ban,Yan Li,Yusheng Qin,Yaochen Zheng,Xiubo Xie,Zhen Yu,Jie Kong
The rational regulation of the magnetic-dielectric composition and microstructures of the absorber is considered an important approach to optimize both the impedance matching and the electromagnetic microwave attenuation ability. Along these lines, a novel architecture-controlled large-caliber carbon nanotube/mesoporous carbon/Fe 3 C nanoparticle-based hybrid nanocomposites (CNT/C/Fe 3 C), which were derived from the CNT/polyimide (PI) assemblies anchoring ferric oxide hydrate nanoprecipitates, are presented in this work. The proposed configurations were prepared by applying a cooperative co-assembly strategy and high-temperature pyrolysis procedure for the development of an ultra-lightweight electromagnetic microwave absorber. The employed hierarchically tubular heterogeneous architecture is composed of a highly graphited CNT supporting skeleton, polyimide assemblies-converted carbon interlayer with mesopores , and uniformly distributed magnetic Fe 3 C nanoparticles. This unique hierarchical structure can not only induce multiple reflection and scattering effects of the incident electromagnetic microwave but also trigger dipole/interfacial polarization, ferromagnetic resonance and eddy current loss that are beneficial for the synergistic dielectric and magnetic loss. Moreover, the large-caliber CNT and mesoporous carbon interlayer can endow the as-prepared absorber with lightweight characteristics. Hence, the proposed CNT/C-EDA/Fe 3 C-900 hybrid nanocomposite exhibits a minimum reflection loss (RL) of −48.4 dB at a matching thickness of 3.2 mm, and the effective absorption bandwidth (RL ≤ -10 dB) almost covers the whole X-band only with a 5 wt% filler loading. Undoubtedly, these encouraging outcomes will promote the development of hierarchical engineering techniques of novel magnetic-dielectric nanocomposite absorbers.
研究领域:
材料科学
·
纳米技术
·
电磁工程
·
复合材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 25
·9881-9889
·
IF 8.262
Hailong Lyu,Jiurong Liu,Song Qiu,Yonghai Cao,Chenxi Hu,Shimei Guo,Zhanhu Guo
Carbon composite fibers with Fe3O4, Fe3C, and TiO2 nanoparticles (Fe3O4/Fe3C/TiO2/C) were successfully fabricated using a facile dry-spinning approach, followed by annealing under argon flux. When used as the anode material of a lithium-ion battery, the Fe3O4/Fe3C/TiO2/C composite fibers achieved a reversible capacity of 702.1 mA h g−1 after 400 cycles at a current density of 100 mA g−1 and ca. 200 mA h g−1 at a current density of 1000 mA g−1 in 350 cycles. The superior cycling performance and high rate capability were attributed to the high theoretical specific capacity of Fe3O4, the catalytic activity of Fe3C, the structural stability of TiO2, and the buffer function of carbon fiber. Compared with the corresponding Fe3O4/Fe3C/C and TiO2/C composite fibers, the Fe3O4/Fe3C/TiO2/C product exhibited higher cycling and rate performances due to the synergetic effect among the Fe3O4, Fe3C, TiO2 and carbon components.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2022
·Vol. 9
·期 12
·126101
·
IF 2.025
Jing Wang,Li Ma,Zhengwei Pan,Tingyun Li
A high-efficient and stable catalyst is highly desired to catalyze ozone for refractory organic pollutants removal. In this work, Mn-Ce bimetallic oxide loaded CNT@Fe3C (Mn0.7Ce0.3Ox/CNT@Fe3C) was synthesized with Mn0.7Ce0.3Ox as the active component and magnetic CNT@Fe3C as the support. The catalytic performance of Mn0.7Ce0.3Ox/CNT@Fe3C towards catalytic ozonation was evaluated. The TOC removal efficiency of phenol degradation after 45 min of reaction was 98%, which was 1.5 times and 1.8 times that of monometallic CeO2/CNT@Fe3C (65%) and MnxOy/CNT@Fe3C (54%), respectively. The synthesized-Mn0.7Ce0.3Ox/CNT@Fe3C possessed good reusability during five successive cycles and remained efficient over a wide range of pH 4.2–8.3. The results of EPR measurements and quenching experiments demonstrated that hydroxyl radicals (·OH) were the dominant reactive oxidation species (ROS) for phenol mineralization in the Mn0.7Ce0.3Ox/CNT@Fe3C/O3 system. Moreover, the magnetic Mn0.7Ce0.3Ox/CNT@Fe3C is easily recovered and reused.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 25
·12229-12236
·
IF 3.925
Lin Yang,Jingxian Wang,Anchang Li,Honghai Liu,Ming Zhang,Zhongrong Shen
Porous carbon has attracted great interest as an anode for lithium-ion capacitors (LICs) due to its high lithium-ion storage capacity. However, its low electrical conductivity and tap density are major challenges facing its commercialization. In this study, a low-cost Fe3C@N-doped C material has been synthesized via the polymerization and carbonization of the natural biomass material sodium alginate (SA) and commercial p-Phenylenediamine (PPD). FeCl3 is used as both a crosslinking agent and catalyst to promote the PPD oxidation reaction and the degree of carbonization. The as-obtained graphite-like Fe3C@N-doped C with a carbonization treatment at 700 °C exhibits both high Fe and N contents of 3.93 wt% and 5.34 wt%, respectively, and a high electrical conductivity equivalent to graphite, which would be favorable for lithium-ion storage due to the synergistic effect of the high electrical conductivity and pseudocapacitive characteristics. Moreover, the Fe3C@N-doped C exhibits a superior lithium-ion storage capacity of 566.0 mA h g−1, higher than that of commercial graphite, and a high tap density of 0.59 g cm−3. As the negative electrode for an LIC, the capacitor delivers a high specific energy of 86.6 W h kg−1 at a current density of 0.1 A g−1. Meanwhile, good cyclability has also been achieved for the cell. The superior electrochemical properties of the LICs could be attributed to the high lithium-ion storage capacity and good cycling stability of the Fe3C@N-doped C material.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Sihai Lv,Yongzhi Cheng,Fu Chen,Xiangcheng Li,Hui Luo
Exploring high-performance electromagnetic wave (EMW) absorbers remains a formidable challenge in the face of severe EMW radiation and interference. The incorporation of manganese oxide into carbon matrix magnetic composites is proposed to enhance the EMW absorption properties in this work. Multiple interfacial ternary-component Fe 3 C/MnO/Nitrogen-doped carbon (NC) absorbers were synthesized through facile hydrothermal, oxidative polymerization and carbothermal reduction processes. The results indicated that the composites designed exhibit excellent EMW absorption properties, with an effective absorption bandwidth of 4.88 GHz (13.12–18 GHz) at a mere thickness of 1.5 mm. The outstanding performance of EMW absorption can be attributed to the effective modulation of electromagnetic parameters through a large number of heterogeneous interfaces, defects, and magnetic loss. Meanwhile, adjusting the filling ratios of the composites in the absorber also can significantly adjust the electromagnetic parameters of the samples. This work presents effective approach for the preparation of high-performance EMW absorbers with ternary components, as well as a strategy for developing novel broadband absorbers that are lightweight and have thin thickness.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 43
·23103-23112
·
IF 14.511
Xuqi Lin,Jingguo Gao,Kehua Zhong,Yongcong Huang,Hurong Yao,Yingbin Lin,Yongping Zheng,Zhigao Huang,Jiaxin Li
For high-performance silicon–carbon (Si–C)-based anode materials used in high-energy-density lithium-ion batteries (LIBs), there is an urgent need to rationally construct a stable solid electrolyte interface (SEI) film and load a high proportion of silicon content, which is closely related to the capacity and cycling stability of the electrode. Herein, composites of Fe/Fe3C-modified carbon nanofiber–coated Si nanoparticles (Fe/Fe3C–Si@CNFs) were synthesized via a simple electrospinning method. These composites effectively overcome the volume change effect, poor interfacial compatibility and low conductivity, delivering excellent LIB performance. Tested at 2.0 A g−1, Fe/Fe3C–Si@CNFs provides a high reversible capacity of 956.5 mA h g−1 with a coulombic efficiency of more than 99.5% even after 4000 ultra-long stable cycles. The high conductivity of the Fe/Fe3C embedded in the CNF framework can promote e− transfer and boost the Li+ diffusion kinetics in the electrode. The catalytic activity of Fe/Fe3C helps to enhance the interfacial compatibility, grow a balanced stable SEI film and promote the long-cycle stability of the electrode at room temperature.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Mengqiao Li,Liang Chen,Jing Sui,Geoffrey I.N. Waterhouse,Zhiming Zhang,Liangmin Yu
The rapid growth of the dyeing and printing industry has resulted in severe water pollution, posing significant threats to human health and ecosystems. To effectively tackle this challenge, this study presents a novel approach using marine biomass-derived carbon (kelp) combined with Prussian blue (FeCu-PBA) to synthesize carbon-based nanoclusters (Cu-Fe 3 C@KC) for efficient microwave-assisted degradation of high-concentration dyes. By optimizing the FeCu-PBA-to-kelp mass ratio (FeCu/KC), we tailored the material’s morphology and enhanced its microwave absorption properties, achieving rapid and effective dye degradation. Experimental results demonstrate that Cu-Fe 3 C@KC-3 degraded methyl orange, methylene blue, crystal violet, and rhodamine B with efficiencies of 99.37 %, 96.23 %, 94.67 %, and 99.77 %, respectively, within just 4 min. Mechanistic studies, including free radical capture experiments and electron paramagnetic resonance (EPR) analysis, revealed that superoxide radicals ( O 2 − ), holes (h + ), electrons (e − ), and hydroxyl radicals ( OH) were the primary reactive species in the degradation process, with OH playing a dominant role due to its strong oxidative capacity. This research highlights the dual advantages of Cu-Fe 3 C@KC-3: superior catalytic performance and cost-effectiveness. The innovative use of kelp as a precursor provides a sustainable and economical pathway for the large-scale treatment of dye-laden wastewater, addressing critical environmental challenges with significant practical implications.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 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）