Journal of Energy Chemistry
·
2020
·
IF 7.216
Yuzhi Li,Siwei Li,Jing Hu,Yuanyuan Zhang,Yuchen Du,Xijiang Han,Xi Liu,Ping Xu
Designing readily available and highly active electrocatalysts for water splitting is essential for renewable energy technologies. Here we present the construction of FeCo-FeCoP@C hollow nanocubes encapsulated in nitrogen-doped carbon nanocages (FeCo-FeCoP@C@NCCs) through controlled carbonization and subsequent phosphorization of a Prussian blue analogue. With stronger electronic interaction and hollow structure, the as-obtained FeCo-FeCoP@C@NCCs material requires small overpotentials of 91 mV and 280 mV to deliver 10 mA cm −2 in 1 M KOH toward hydrogen and oxygen evolution, respectively. More importantly, applying this material for overall water splitting, it only requires 1.64 V to afford 10 mA cm −2 and exhibits impressively durability over 40 h without obvious performance decay. The present approach inspires potentials for the controllable synthesis of multi-component catalysts for practical applications.
研究领域:
材料科学
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能源技术
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Mei Guo,Xin Zhang,Tianhua Yang,Qidong Dang,Xuejin Li,Yaqun Wang,Guoxin Zhang
Aluminum-air batteries (AAB) have been expected as one promising energy technology for next-generation electrical vehicles owing to their low costs, light weights, high specific energy, environmental benignity and mechanical rechargeability. Yet currently, efficient catalytic materials for air cathodes are mostly based on expensive and scarce precious metal Pt, which have severely impeded the implantation of AAB. Herein, a series of non-precious binary FeCo-nitrogen-doped carbon (FeCo-NC) materials with heavily loaded Fe/Co species and in-situ generated interconnected carbon nanotube (CNT) were synthesized from cost-effective materials. With merits of dense active sites, largely exposed surface area, and good electron/ionic conductivity, the as-made binary FeCo-NC with optimal synthetic parameters exhibit excellent oxygen reduction reaction performance in alkaline electrolyte , rendering high onset potential of 1.05 V and half-wave potential of 0.91 V, which surpass those of Pt/C by 50 and 40 mV, respectively. Remarkably, the FeCo-NC-assembled AAB delivers an exceptional open-circuit voltage of 1.88 V and a large specific power of 188 mW cm −2 , and additionally maintains high discharge voltage of 1.70 V at the current density of 10.0 mA cm −2 . Our work renders a new type of high-performance air cathode material for AAB implantation.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2024
·
IF 1.3
Peng Zhang,Xin Meng,Xiaomin Luo,Jian Wang,Jianyan Feng,Yun Ma,Ka Li,Ying Liu,Lufeng Ji
Herein, we innovatively crafted a novel CNT/MoS 2 /FeCo-LDH cathode membrane using a facile vacuum filtration method. Benefiting from the unique heterostructure between FeCo-LDH and MoS 2 , the prepared CNT/MoS 2 /FeCo-LDH cathode membranes catalyzed the production of high-concentration H 2 O 2 (7.59 mg/L) at a low current density of 1.50 mA/cm 2 . The peak degradation efficiency of phenol (98.80 %) was reached in only 60 min. Under optimized operating conditions, the phenol removal rate of the CNT/MoS 2 /FeCo-LDH cathode membrane remained above 80.00 % within a wide pH range (3.0–9.0), demonstrating excellent adaptability. The synergistic incorporation of Mo, Fe, and Co ions facilitated additional chemical reaction pathways for Fenton-like reactions, thereby significantly enhancing hydrogen peroxide production. Notably, our approach exhibited moderate total organic carbon degradation efficiency, even for the actual pretreatment of coking wastewater, presenting a promising strategy for addressing recalcitrant industrial wastewater.
研究领域:
环境科学
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材料科学
·
废水处理技术
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2018
·
IF 1.1
An Ye,Jiqiu Qi,Yanwei Sui,Fei Yang,Fuxiang Wei,Yezeng He,Qingkun Meng,Zhi Sun
A solid-state energy storage device has been fabricated using FeCo-selenide nanosheet arrays as positive electrode and Fe 2 O 3 nanorod as negative electrode. As an electrode material, the ternary FeCo-selenide nanosheet arrays supported by Ni foam show a highest specific capacitance of 978 F/g (specific capacity of 163 mAh/g) at 1 A/g and a superior cycle behavior of 81.2% are obtained after 5000 cycles at current density of 4 A/g. The asymmetric supercapacitor achieves the maximum energy density of 34.6 W h/kg at the power density of 759.6 W/kg. Furthermore, the superior cycling stability with 83% retention of initial capacitance after 5000 cycles further verify the practical applications of FeCo-selenide//Fe 2 O 3 asymmetric supercapacitor. Meanwhile, the LED bulb and the light board of “CUMT” are lighted by connecting several capacitors to form a series circuit.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Ling Ding,Ying Huang,Xudong Liu,Zhipeng Xu,Suping Li,Jing Yan,Panbo Liu
The core-shell composite of FeCo alloy coated with amorphous carbon and mesoporous silica (mSiO 2 for short) has been successfully fabricated through liquid-phase reduction, hydrothermal reaction as well as high temperature calcination , forming nanoparticles around 400 nm in size. The alloy core provides strong magnetic loss and keeps stable under the protection of the shell, while the carbon shell reduces density and promotes dielectric loss. The outer layer of mSiO 2 provides a larger specific surface area for multiple reflections, and meanwhile effectively adjusting the impedance matching, resulting in a better absorption. With a thickness of 3.5 mm, the maximum R L of the composite reaches −46.79 dB at 11.84 GHz, and the effective absorption bandwidth with the R L below −10 dB is up to 8.8 GHz (from 9.2 to 18.0 GHz). Hence, FeCo@C@mSiO 2 composite is potential to become an excellent candidate in the field of microwave absorption.
研究领域:
材料科学
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纳米技术
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电磁工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 6
·1-14
·
IF 23.2
Qiu Jiahang,Zhang Mu,Zhao Rongzhi,Sun Xudong,He Dianning
The quest for broadband electromagnetic wave absorption to satisfy the demands of various fields has emerged as a prominent research focus in the domain of electromagnetic wave absorption. By considering the effects of magnetic loss and polarization loss across different frequency bands, the development of composite materials incorporating magnetic metal particles and single metal atoms may facilitate an expansion of the electromagnetic wave absorption frequency range. Consequently, we synthesized FeCo@C/Ni@C composites derived from FeCo Prussian blue analogues and polydopamine through wet chemistry and pyrolysis methods. The chelation mechanism of polydopamine, combined with the physical barrier effect provided by Zn ions during synthesis, endows the FeCo@C/Ni@C composite with low-frequency magnetic loss characteristics from the FeCo alloy, high-frequency dipole polarization losses attributed to Ni atoms, and conductivity losses arising from the coupled carbon matrix. Ultimately, the composite exhibits exceptional electromagnetic wave absorption performance: at a thickness of 2.26 mm, it achieves a minimum reflection loss value of − 50.1 dB along with an effective absorption bandwidth reaching up to 6.0 GHz. In summary, this work presents a novel strategy for enhancing broadband absorption capabilities in electromagnetic wave absorbing materials.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ziting Huang,Xiaoqian Zhang,Ze Zhu,Zhenfeng Guo,Xinqiang Wang,Luyi Zhu,Guanghui Zhang,Benxue Liu,Dong Xu
Transition metal-based non-homogeneous materials have excellent activation properties for persulfates (peroxymonosulfate and peroxydisulfate, abbreviated as PMS and PDS). In this study, FeCo-CoFe 2 O 4 (FC-CFO) biphasic fibers were prepared using the electrospinning technique and a stepwise heat-treatment. The prepared fibers possessed magnetic separation properties (Ms = 91.7 emu/g) and achieved a 93.8 % degradation efficiency of norfloxacin (NFX) in 10 min. Quenching experiment, ESR spectrum, and intermediate product revealed that radical •SO 4 − and non-radical 1 O 2 species made major contribution to the FC-CF-500/PMS/NFX system. XPS spectrum and ESR spectrum of oxygen vacancy suggested the abundant oxygen vacancies generated in FC-CFO-500 fibers which could trigger the generation of 1 O 2 . Those findings may demonstrate a reference preparation method of electrospinning nanofibers with an improved PMS activation ability.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 28
·13481-13495
·
IF 4.682
Li Wangchang,Su Guangzhou,Li Wanjia,Ying Yao,Yu Jing,Zheng Jingwu,Qiao Liang,Li Juan,Che Shenglei
Well-dispersed silica-coated FeCo nanocubes are mass prepared using the polyol process and are then amine-functionalized with 1,6- diaminohexane. Further, the almost “matrix-free” soft magnetic nanocomposites (SMNCs) are fabricated using the FeCo nanocubes as bricks, which are cross-linked by epoxy monomers in which the nanoparticles are well separated. These SMNCs exhibit a dense microstructure and extremely high resistivity that limit the eddy current loss, thereby allowing excellent high-frequency inductance performance in a few hundred megahertz and extending the cutoff frequency to 2–7 GHz. The permeability is approximately 8.0 with excellent high-frequency stability at 1 GHz. The quality factor of the nanocomposites exceeds 200 in the 100 MHz range and 500 in the few megahertz range that corresponds to the 36 and 13 nm silica-coating samples, respectively. Furthermore, they exhibit a novel microwave absorbing property with an extremely thin thickness. The absorption approaches − 46.5 dB at 2.41 GHz with only a 1.75 mm nanocomposite absorbing layer. This SMNC presents great potential as multifunction components to satisfy the urgent requirement of wide bandgap semiconductor power in the megahertz range and microwave devices in the gigahertz range.
Graphical abstract
研究领域:
材料科学
·
纳米技术
·
电磁材料
✓ 已验证
产品关联
DOI
高影响因子
Progress in Natural Science-Materials International
·
2021
·
IF 3.607
Xinxin Jin,Yan Xie,Chaoyue Zhao,Yinghao Xu,Yang Lv,He Wang,Li Chen,Jiahui Huang
FeCo-based non-noble metal electrocatalysts (NNMEs) of FeCo/MCS-NPCS was fabricated by immobilization of hemin on mesoporous carbon shells modified N-doped porous carbon spheres (MCS-NPCS). The obtained FeCo/MCS-NPCS exhibits a half-wave potential (E 1/2 ) of 0.851 V versus the reversible hydrogen electrode (vs. RHE) and a limited-diffusion current density (J L ) of 5.45 mA cm −2 . In addition, FeCo/MCS-NPCS shows comparable oxygen reduction reaction (ORR) performances to 20 wt% Pt/C in terms of E 1/2 and J L and better electrochemical properties, including the methanol tolerance and durability in alkaline solution. Such outstanding electrochemical activities of FeCo/MCS-NPCS can be ascribed to Fe and/or Co-based nitrides and carbides as well as N-doped carbon matrixes modified with mesoporous carbon shells. This research introduces a promising path to design and synthesize highly efficient FeCo–N–C electrocatalysts towards ORR.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Kunpeng Song,Guanghui Li,Junchen Yu,Tianyue Zheng,Jingyu Wang
Efficient methods for preparing carbon nanotube (CNT)-confined metal catalysts are of great significance for electrocatalysis. Hence, in this study, Fe and Co promoters were added to the precursors of commercial carbon black and melamine to form N -doped CNTs confined bimetallic catalysts (FeCo@ N -CNTs) via in situ pyrolysis. The FeCo@ N -CNT catalysts exhibited a bamboo-like morphology with FeCo alloy nanoparticles encapsulated in the CNTs and high activity toward the oxygen reduction reaction, with a half-wave potential of 0.864 mV, higher than that of commercial Pt/C (0.827 mV) in alkaline solutions. The catalytic performance is attributable to the synergistic effects between the FeCo alloy and N -doped CNT structure. Moreover, the confinement of the FeCo nanoparticles inside the CNTs imparted the prepared catalysts with resistance to methanol poisoning and long-term stability. This versatile method of synthesizing CNTs directly from carbon black provides a new strategy for preparing high-performance non-precious-metal-based N -doped CNT catalysts for practical fuel cell applications.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Pingwei Cai,Suqin Ci,Erhuan Zhang,Ping Shao,Changsheng Cao,Zhenhai Wen
Highly electrocatalytic activity and strong stability towards both oxygen evolution (OER) and oxygen reduction reaction (ORR) have been regarded as the critical factors in widespread application for the renewable energy technologies. It still remains a huge challenge for developing bifunctional catalysts with low cost, efficiently electrocatalytic activity and strong stability. In this paper, FeCo alloy nanoparticles embedded in nitrogen-doped carbon are synthesized through a simple thermal decomposition of Co-Fe Prussian Blue Analogue (Co-Fe PBA) in Ar atmosphere, during which the organic ligand of CN − in Co-Fe PBA provides both carbon and nitrogen sources for forming nitrogen-doped carbon and FeCo alloy nanoparticles were formed, and thus producing a core-shell structure (FeCo@NC). According to a set of electrochemical tests, the obtained FeCo@NC can function as a Janus to drive OER and ORR with desirable activities and stabilities in alkaline media. Specifically, the FeCo@NC presents an onset-potential of 1.45 V, a potential of 1.49 V at 10 mA cm −2 , a Tafel slope of 62 mV dec −1 as OER catalyst, and an onset potential of 0.94 V, a half-wave potential of 0.8 V as ORR catalyst. The performance is comparable to those of precious metal based electrocatalysts , making it possible for potential application in the renewable energy devices, especially Zn-air battery.
研究领域:
材料科学
·
电化学
·
可再生能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 11
·A2502
·
IF 3.662
Liang Yu,Qingfeng Yi,Guang Li,Yao Chen,Xiaokun Yang
Precious metal-free C-N composites possess great significance as replacements for Pt-based catalysts used as cathodes in fuel cells. Herein, we have fabricated the Fe/Co-doped C-N composite catalysts, marked as C-N, Co/C-N and Fe-Co/C-N, by direct pyrolysis of the dried suspensions consisting of cobalt/iron salt, dicyandiamide and glucose. For the Fe-Co/C-N catalyst, its morphological texture is characterized by Fe-Co nanoparticles and hollow bamboo-like nitrogen-doped carbon nanotubes (C-N nanotubes). The electroactivity of the prepared samples for oxygen reduction reaction (ORR) in a neutral medium has been investigated. The catalyst Fe-Co/C-N presents the highest ORR current density of 5.1 mA·cm−2 @0.8V (vs Ag/AgCl) in a neutral medium. A zinc-air battery in neutral KNO3 solution, assembled with zinc as the anode and carbon paper loaded by the prepared catalysts as the air electrode (cathode), displays excellent and stable discharge performance. The maximum power density of the Fe-Co/C-N catalyst is 32 mW·cm−2, and the continuous discharge time reaches 209, 155, 17 h at constant discharging current density of 25, 50 and 100 mA·cm−2 respectively. Simultaneously, the air electrode using the Fe-Co/C-N as the catalyst shows good cycle stability and repeatability. Results reveal that the Fe-Co/C-N is a very promising cathodic catalyst applied in neutral zinc-air battery.
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）