JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Qing Dong,Fenglong Zhang,Shan Ji,Xuyun Wang,Hui Wang,Vladimir Linkov,Rongfang Wang
Commercial applications of lithium-sulfur batteries are hindered by the low electrical conductivity of sulfur cathodes, which can be overcome by the application of suitable sulfur host materials. In this work, a novel and effective method is developed to grow bamboo-like N-doped carbon nanotubes (NCNTs) across three-dimensional N-doped porous carbon network (NPCNs) via chemical vapor deposition , thereby successfully preparing the sulfur-loaded composite carbon material inserted into the porous network. In such structure, carbon nanotubes act as electronic conduction paths, carbon networks as mass transfer channels, as well as the inserted Fe 3 C nanoparticles can increase the polarity of the carbon matrix. The discharge capacity of the S-NCNT/NPCNs cathode, as high as 1125 mAh g −1 at 0.2 C, retains 43.5% of its value when the current is increased 10-fold to 2 C. A specific capacity of 548.1 mAh g −1 at 1 C remains almost unchanged after 300 cycles, demonstrating better charge and discharge performance and excellent cycling ability of these promising candidate materials for Li-S battery applications. More importantly, the synthesis strategy is universal and can be fully extended to prepare other units, even binary NCNT/NPCNs (for example, NCNT/NPCNs-Co, NCNT/NPCNs-Co-Fe, NCNT/NPCNs-Fe-Ni, and NCNT/NPCNs-Co-Ni). The new strategy provided here may open up new ways for the application of hybrid carbon nanostructures in energy storage systems.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Xiuxiu Sun,Ani Zhou,Shuzhen Li,Maoguo Li
On using magnetic Fe3O4 as the core of nitrogen-doped carbon (NC) matrix composite Fe3C (Fe3C/Fe3O4@NC), it not only shows good peroxide-like and oxidase-like properties but also has excellent Fenton-like degradability. Based on the Fenton-like properties of the core–shell nanocomposites, ciprofloxacin can be degraded by activated peroxo monosulfate. The magnetic core is easy to recover, and the shell has good catalytic performance. The degradation rate using Fe3C/Fe3O4@NC as the catalyst was 7.3 and 2.9 times that of Fe3O4 and Fe3O4@NC as catalysts, respectively, and the sulfate radical was found to be the main active species involved in the degradation. The actual performance of the catalyst was evaluated in simulated wastewater and different water sources. Inorganic anions slightly changed the degradation rate, while common organic compounds in wastewater reduced the degradation rate. The composite materials have excellent catalytic performance, good magnetic response, and repeatability, which are conducive to practical application in wastewater treatment process.
研究领域:
环境科学
·
催化材料
✓ 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.
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 ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Xiaoying Zhai,Weiguo Lin,Jinkai Liu,Xu Chen,Junfeng Yong,Wensheng Yang
The development of earth-abundant electrocatalysts to replace noble metal for oxygen reduction reaction (ORR) has attracts tremendous interest. In this work, Fe, N-codoped porous carbon-embedded Fe 3 C nanoparticles (Fe 3 C/Fe, N-PCR) is fabricated from petroleum vacuum residue via a simple template-assisted and subsequent doping-assisted calcination method. The unique hybrid material shows great features: abundant active sites including pyridinic N, Fe N, and Fe 3 C nanoparticles, a relatively large surface area (509.3 m 2 g − 1 ) and 3D interconnected hierarchical porous structure. The Fe 3 C/Fe, N-PCR as an electrocatalyst exhibits remarkable ORR catalytic activity in alkaline medium, with a high onset potential of 1.02 V and half-wave potential of 0.86 V, which surpass commercial Pt/C (20 wt%) by ca. 30 and 20 mV, respectively. Moreover, Fe 3 C/Fe, N-PCR has outstanding long-term stability and tolerance to methanol poisoning, outperforming Pt/C. Combining with the exciting performance, abundant and cheap raw material, and facile synthetic method, Fe 3 C/Fe, N-PCR catalyst has promising future in ORR. This study also provides a new approach for high value utilization of petroleum vacuum residue.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Sheng-Nan Zhuo,Hao Sun,Zhi-Ying Wang,Hong-Yu Ren,De-Feng Xing,Nan-Qi Ren,Bing-Feng Liu
This study, a magnetic biochar catalyst (Fe-N@MFC) with Fe 3 C and Fe 4 N was synthesized via one-step pyrolysis using waste floc as a raw material. Fe-N@MFC shows an efficient catalysis in activating peroxydisulfate (PDS) to degrade tetracycline (TC). 90.5 % of TC (5 mg/L) is removed within 60 min in the Fe-N@MFC/PDS (0.5 g/L and 1.8 mM) system with a degradation rate constant of 0.33043 min −1 . Reactive oxygen species (·OH, SO 4 ·− , 1 O 2 , and ·O 2 − ) and electron transfer are generated in the reaction system. ·OH and SO 4 ·− radicals make a major contribution to TC degradation . Variation in material structure and DFT calculations prove that the existence of Fe 3 C and Fe 4 N enhances the adsorption energy of PDS and promotes the redox reaction between PDS and Fe species (Fe 0 and Fe-N). Based on iron ion leaching, recycling experiment and application in real water, the Fe-N@MFC catalyst is found to exhibit promising potential. This work represents a progress compared to the traditional technology used for preparing Fe N C biochar catalysts and provides significant guidance for the further development of biochar in the future.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Chenyu Zhao,Runze Fan,Balaji Murugesan,Yan Xu,Jiahui Ma,Juming Yao,Izabella Krucinska,Yurong Cai,Junkuo Gao
Biomass-derived carbon is considered a promising alternative to commercial graphite anode because of its renewability and tunable physical/chemical properties. However, the specific capacity and rate capability of biochar anode materials must be further enhanced to satisfy the increasing energy demand. Here, we report a facile strategy to synthesize uniform Fe 3 C inserted sericin-derived porous carbon (Fe 3 C/SC) via coordination with Fe 3+ ions to the carboxylate radicals of sericin protein. The obtained composite retains a hierarchical pore structure with an interconnected carbon scaffold. In particular, the embedded Fe 3 C nanoparticles (NPs) in the carbon matrix will serve as a catalyst for the modification of the solid electrolyte interphase (SEI) layer during the cycles, which effectively enhance reversible capacity. The resulting anode provides high reversible capacity (584.0 mAh g −1 at 0.1 A g −1 after 150 cycles), superior rate capability (259.0 mAh g −1 at 2 A g −1 ) and remarkable cycling stability under high current density (219.7 mAh g −1 retention at 2 A g −1 after 600 cycles). This composite is expected to be one of the most potential anode materials for lithium-ion batteries, owning to its cost-effective, facile synthesis and efficient performance with excellent electrochemical properties .
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 23
·6170-6180
·
IF 6.367
Jijun Lu,Junhao Liu,Xuzhong Gong,Zhi Wang
Silicon is considered to be the most promising candidate for the anode of high energy density lithium-ion batteries. Nanometerization has been proven to be an effective method for improving the stress accumulation caused by the volume expansion of silicon. However, new issues such as poor initial coulombic efficiency (ICE) need to be solved because nanostructure silicon has an increased specific surface area. Here, a doping modification strategy is developed by a solvothermal combined with low-pressure gas–solid conversion reaction, and innovatively formed an Fe3C/N co-doped carbon coating on the nano-silicon surface. The doping of Fe3C in the composite material can catalyze the formation of a thin and stable solid electrolyte interphase (SEI) on the electrode surface and serve as a framework to stabilize the electrode structure during charge and discharge. As a result, Fe3C doping can significantly increase the ICE of the electrode from 66.4% to 87.1%, and the stable efficiency exhibited a rapid increase upwards of 99.5% after only 6 cycles including the first formation cycle, compared to the non-doped structure. The modified nano-silicon with Fe3C doping can provide high reversible capacity (1443.3 mA h g−1 after 200 cycles at 0.2 A g−1) and long cycle life (74% capacity retention after 1000 cycles at 0.5 A g−1).
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Lili Cui,Qiaoling Zhang,Xingquan He
The Fe 3 C encapsulated in nitrogen doped carbon nanotubes electrocatalysts (Fe 3 C@N-CNTs) are constructed derived from iron metal-organic framework (Fe-MOF) by a facile method. It is well accepted that the catalytic performance is dependent on the morphology of the electrocatalyst. Thus, here, the morphology of the carbon nanotubes is obtained by tuning the species of iron salt and the annealing temperature, the optimal material shows nanotube morphology and high surface area. Also, it is noted that FeNC-Cl/800 has higher N content compared to FeNC-NO 3 /800, indicating that Cl − favor in promoting nitrogen doping. In alkaline condition, the optimized Fe 3 C@N-CNTs catalyst exhibits more positive onset and half-wave potentials (0.98, 0.85 V vs RHE) than other contrast samples. Importantly, it displays a more positive onset and half-wave potentials of 0.82, 0.68 V vs RHE in acidic medium. It shows a 4e − pathway towards ORR, good capacity of stability and methanol tolerance in both alkaline and acidic media. The excellent electrocatalytic performance arises from various active sites (Fe 3 C and N doping), pretty morphology and hierarchically porous structure.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shuya Zhang,Qiming Chen,Qianqiao Wang,Xinyu Luo,Mingjun Cen,Wenchao Peng,Yang Li,Qicheng Zhang,Xiaobin Fan
The electrochemical oxygen reduction reaction (ORR) plays a crucial role in air-breathing energy conversion systems. However, its kinetics are constrained by a multistep proton-coupled electron transfer process, wherein the adsorption of the OOH* introduces high energy barriers. Herein, we present N-doped carbon-supported ultrafine V-incorporated Fe 3 C nanoparticles (V-Fe 3 C@NC) featuring abundant Fe coupling with V, serving as reaction sites for efficient ORR. Experimental characterizations confirm the incorporation of V species leads to a significant enhancement in ORR kinetics. The prepared V-Fe 3 C@NC electrocatalyst demonstrates exceptional ORR activity with a half-wave potential of 0.91 V. Density functional theory calculations elucidate that the synergy between Fe and V sites facilitates direct O–O bond breakage, circumventing the formation of the OOH* and resulting in lower ORR energy barriers. Moreover, the aluminum-air (Al-air) batteries derived from ultrafine V-Fe 3 C@NC nanoparticles display outstanding performance with a high open-circuit voltage of 1.92 V and a large specific capacity of 2309 mAh g −1 under the air environment. The elucidation and understanding of synergy in dual reaction sites present a novel approach for the rational design of supported metal nanoparticle electrocatalysts for energy-related applications.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 5
·1232-1238
·
IF 2.726
Chen Weijie,Xia Huicong,Guo Kai,Jin Wangzhe,Du Yu,Yan Wenfu,Qu Gan,Zhang Jianan
Lithium-sulfur(Li-S) batteries have been puzzled by the “shuttle effect”. In the recent years, catalytic materials present a huge potential for solving this problem. However, the exploitation for catalytic activity was still challenging in Li-S batteries. In this article, we put forward a single atom catalyst (SAC) of FeN 4 coupled with Fe 3 C on the N-doped carbon (FeN 4 /Fe 3 C@NC) by one-step pyrolysis method. The FeN 4 and Fe 3 C synergistically catalyze the polysulfides conversion when the N-doped carbon provides the high conductive three-dimensional skeleton in Li-S batteries. As a result, the FeN 4 /Fe 3 C@NC shows a specific capacity of 1100 mA·h/g at 0.2 C(1 C=1675 mA/g). In addition, the FeN 4 /Fe 3 C@NC maintains 99.01% of the pristine specific capacity after 100 cycles at 0.5 C, indicating the improved electrochemical performance in Li-S batteries. This work sheds new lights on the design of engineering catalysts for developing high-performance Li-S batteries.
研究领域:
电化学
·
能源材料
·
纳米催化
·
电池技术
·
材料化学
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2017
·Vol. 5
·期 3
·471-477
·
IF 4.136
Jingchun Jia,Huijuan Yang,Genxiang Wang,Peng Huang,Pingwei Cai,Zhenhai Wen
Graphical All-round activity : Hybrids of Fe/Fe 3 C embedded in N-doped carbon nanotubes (Fe/Fe 3 C@NCNTs) are prepared by pyrolyzing mixtures of Fe 3 O 4 nanoparticles and dicyandiamide. Fe/Fe 3 C@NCNTs show a highly multifunctional catalytic activity for the oxygen evolution, oxygen reduction, and CO 2 reduction reactions. Hybrids of Fe/Fe 3 C embedded in N-doped carbon nanotubes (Fe/Fe 3 C@NCNTs) are prepared by pyrolyzing mixtures of Fe 3 O 4 nanoparticles and dicyandiamide. The systematic electrochemical study of Fe/Fe 3 C@NCNTs shows a decent catalytic activity toward the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR). The sample of Fe/Fe 3 C@NCNTs at 750 °C exhibits a remarkably high activity with an onset potential of 1.47 V for the OER, and an onset potential of 0.96 V and half-wave potential 0.88 V for the ORR, which inspired us to set up a rechargeable Zn-air battery with such Fe/Fe 3 C@NCNT nanohybrids as the cathode materials, showing a maximum power density of 198 mW cm −2 and long-term stability after 500 cycles. We also demonstrate that Fe/Fe 3 C@NCNTs present favorable electrocatalytic activity towards the CO 2 reduction reaction (CO 2 RR) with a low onset potential and good selectivity. The major products are a mixture of H 2 and CO gases that can be used for methanol production in the Fischer−Tropsch process.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Miao-Miao Weng,Da-Jun Liu,Xing-Quan He,Tewodros Asefa
High-performance, non-precious metal electrocatalysts have been widely considered among the most prospective candidates to replace Pt-based electrocatalysts for the oxygen reduction reaction (ORR) in fuel cells and metal-air batteries . Herein, we report a synthetic method, involving templating, polymerization and pyrolysis , that produces catalytically active iron carbide (Fe 3 C) nanoparticles-loaded porous N-doped carbon materials from polyaniline- and Fe(III)-modified mesoporous graphitic carbon nitride ( g -C 3 N 4 ). We also show that the resulting noble metal-free materials exhibit good electrocatalytic activity for ORR, with good onset and half-wave potentials, in O 2 -saturated alkaline solution. The structure, composition , crystallinity , and electrocatalytic activity of these materials are found to depend on the pyrolysis temperature and the specific components in the precursor. In particular, the material obtained by pyrolysis at 1000 °C, named Fe 3 C/NC-1000, shows excellent electrocatalytic activity and better performance, in terms of both onset and half-wave potentials, than Pt/C (20 wt% Pt). The material also tolerates the methanol crossover reaction better than Pt/C and shows negligible shift in onset and half-wave potentials to negative values even after use in 3000 cycles of electrocatalysis . This robust, non-noble metal-based carbon material can potentially become a viable alternative to precious metal electrocatalysts for ORR.
研究领域:
材料科学
·
电化学
✓ 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）