Nano Energy
·
2021
·
IF 17.881
Yiyan Wang,Zongge Li,Peng Zhang,Yuan Pan,Ying Zhang,Qiong Cai,S. Ravi P. Silva,Jian Liu,Guoxin Zhang,Xiaoming Sun,Zifeng Yan
Carbon nanofiber (CNF) papers have been widely used in many renewable energy systems , and the development of its catalytic function is of great significance and a major challenge. In this work, we pioneer a time- and cost-efficient strategy for the preparation of large-area flexible CNF films with uniformly distributed diatomic FeN 3 -CoN 3 sites (Fe 1 Co 1 -CNF). Due to the excellent compatibility and similar functionality of the pre-designed ZnFeCo-NC precursors (ZnFeCo-pre) with the electrospun polymer polyacrylonitrile (PAN), the mixture of ZnFeCo-pre and PAN can be co-electrospun and subject to a standard CNF fabrication process. The resulting Fe 1 Co 1 -CNF exhibits excellent bifunctional catalytic performance for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), attributing to the abundant dual catalytic FeN 3 -CoN 3 sites which are mutually beneficial for attaining optimal electronic properties for the adsorption/desorption of reaction intermediates. The assembled liquid-electrolyte ZAB provides a high specific power of 201.7 mW cm −2 and excellent cycling stability. More importantly, due to the good mechanical strength and flexibility of Fe 1 Co 1 -CNF, portable ZAB with exceptional shape deformability and stability can be demonstrated, in which Fe 1 Co 1 -CNF utility as an integrated free-standing membrane electrode. These findings provide a facile strategy for manufacturing flexible multi-functional catalytic electrodes with high production.
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DOI
高影响因子
Advanced Powder Materials
·
2023
·
IF 0
Cheng Li,Yatian Deng,Liping Yang,Bo Liu,Dong Yan,Liyuan Fan,Jian Li,Lichao Jia
Sr 2 FeCo 0.2 Ni 0.2 Mo 0.6 O 6-δ (SFCNM) and Sr 2 FeNi 0.4 Mo 0.6 O 6-δ (SFNM) were prepared as the hydrogen electrode materials for solid oxide cells (SOCs) and comparatively investigated by density function theory (DFT) and experiments to demonstrate the benefit of Co addition. The reduced SFCNM (R-SFCNM) and SFNM (R-SFNM) contain exsolved Fe–Co–Ni and Fe–Ni nanoparticles, respectively. DFT indicates that Fe–Co–Ni has optimized combination of the d-band center (descriptor of catalyst activity) and adsorption behavior for H 2 O, H 2 , H, and OH. The cell with SFCNM hydrogen electrode, La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ (LSGM) electrolyte, and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) oxygen electrode (Cell-SFCNM) demonstrates a higher performance than that with an SFNM hydrogen electrode (Cell-SFNM) at temperatures between 700 and 850 °C in both solid oxide fuel cell (SOFC, 3% H 2 O-97% H 2 /air) and solid oxide electrolysis cell (SOEC, 20% H 2 O-80% H 2 /air) modes. At 850 and 700 °C, the peak power density is 1.23 and 0.48 W·cm −2 in SOFC mode, while the current density is 1.25 and 0.37 A·cm −2 at 1.3 V in SOEC mode, respectively. The performance degradation rates at 750 °C are 0.17 mV·h −1 in SOFC and 0.15 mV·h −1 in SOEC modes within 150 h, which are improved by Co doping.
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DOI
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 45
·15947-15953
·
IF 4.029
Ming Zhong,Dong-Hui Yang,Ling-Jun Kong,Wei Shuang,Ying-Hui Zhang,Xian-He Bu
Developing high-performance electrode materials to replace a traditional graphite electrode is critical for the commercialization of lithium ion batteries, which however still remains a great challenge. Herein, we report a suitable method to synthesize a series of well-dispersed nanostructured Co3O4–CoFe2O4 composites (CCFs) from bimetallic metal–organic frameworks (BiMOFs) with varied Fe3+/Co2+ molar ratios. When used as anodes for lithium ion batteries, the CCF-12 composite exhibits a maximum initial discharge capacity of 1328 mA h g−1, a reversible capacity of 940 mA h g−1 at 100 mA g−1 after 80 cycles, and a better rate capability in comparison with those of pure Co3O4 and other CCF composites. The well-dispersed structure and small particle size are believed to mainly contribute to the outstanding electrochemical performance of CCF-12 electrodes.
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Shuangjiang He,Junchang Wang,Chong Wang,Xiao Zhang,Sen Liang
The Mn-Fe-Co-Zn-O series is a widely used thermistor material, but its thermal stability is compromised by nitrogen glass encapsulation, limiting its application in electrical devices. To address this issue, La 2 O 3 and Y 2 O 3 were used as rare earth oxide dopants, and xR 2 O 3 -Mn 0.76 Fe 0.87 Co 1.07 Zn 0.3 O 4 (x = 0.0025, 0.005, 0.01, 0.02) negative temperature coefficient (NTC) materials were synthesized via solid-state sintering. The effect of rare earth doping on the electrical properties after high-temperature nitrogen annealing was investigated. After annealing at 750°C for 4 h, the variation in resistivity ( ρ 25 ) and material constant ( B 25/50 ) significantly decreases with increasing La doping. For the La-doped sample (x = 0.01), Δρ 25 decreased to 7.77% and ΔB 25/50 to 0.77% (for the Y-doped sample (x = 0.01), Δρ 25 decreased to 22.76% and ΔB 25/50 to 1.91%), compared to the undoped sample, where Δρ 25 reduced by 168.84% and ΔB 25/5 0 by 5.57%. This improvement was attributed to rare earth accumulation at grain boundaries, filling voids and forming R-O bonds, which inhibited oxygen vacancy migration and significantly reduced grain boundary resistance. Rare earth doping effectively improved the thermal stability and electrical consistency of NTC thermistor ceramics in high-temperature nitrogen atmospheres, offering a new strategy for high-temperature encapsulation applications. (Y-doped samples showed similar results, as detailed in the Supplementary Materials.)
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaofang Cao,Mingkai He,Baopeng Ma,Shixuan Liu,Xiaohui Pang,Mingzhen Song,Fudong Zhang,Xiaolian Chao,Zupei Yang,Di Wu
The band degeneracy thus thermoelectric performance of (Fe, Co)Sb 3 based p -type skutterudites can be well modulated by adjusting Co/Fe ratio. Combining systematic experiments and density function theory (DFT) calculations, we revealed in this work that the variation of Co/Fe ratio could result in complicated and mutually coupled effects on the individual thermoelectric parameters (band degeneracy, band gap, Fermi level , filling limit of fillers, phonon spectrum, etc.) and that using Co/Fe ratio to improve the overall thermoelectric figure of merit is nontrivial. We eventually found that the optimal Co/Fe ratio for Mm (Misch metal) filled (Fe, Co)Sb 3 lies at 1.3:2.7, which is somewhat off the Co/Fe = 1:3 point where the largest valence band degeneracy appears. Extra Sb was then introduced to compensate Sb volatilization for improved electrical transport performance. An overall peak figure of merit ZT max of 1.06 was eventually achieved in the sample Mm 0.8 Fe 2.7 Co 1.3 Sb 12.60 , which is among the highest ones for all reported (Fe, Co)Sb 3 based p -type skutterudites so far.
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Yu Wang,Danyang Wu,Jiao wu,Xizhen Zhang,Yongze Cao,Baojiu Chen
We breakthrough the conventional high-temperature paradigm for synthesizing transition metal catalysts by discovering 500 °C as a critical metastable window in ultrafast (>1500 °C/s) Joule heating synthesis. This kinetically confined thermal shock at precisely 500 °C uniquely terminates metal aggregation while locking abundant pyridinic-N sites (2.86 at.%) that effectively anchor highly dispersed Fe and Co species, simultaneously sculpting a defect-rich carbon matrix. This unique combination, inaccessible in traditional pyrolysis, unlocks exceptional synergistic activity. Consequently, the 500 °C-engineered NC-FeCo catalyst achieves an oxygen reduction record: half-wave potential (0.92 V) surpassing Pt/C (0.85 V) and 1500 °C-treated analogs (0.85 V), while delivering near-theoretical 4e − selectivity (<1.2% H₂O₂), negligible decay (ΔE = 3 mV/5000 cycles), and superior methanol tolerance. Our work establishes sub-second 500 °C thermal shock as an innovative platform for metastable dual-metal electrocatalysis.
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Pengyao Guo,Xiaomin Hu
To improve the degradation efficiency of g-C 3 N 4 (CN), transition metal elements (Fe and Co) were doped into CN. A novel Co, Fe co-doped CN (Co/Fe-CN) photocatalysts with small size and irregular flake structure were successfully prepared by thermal polymerization of melamine . Co/Fe-CN has a large specific surface area (55.76 m 2 /g), which provides more adsorption sites and reaction sites for the activation of peroxymonosulfate (PMS). Good visible light response performance (474 nm) and suitable band gap (2.83 eV) ensure that it could be excited by visible light. The active species of • O 2 - , 1 O 2 , • OH and SO 4 •- could be stably produced in Co/Fe-CN/Vis/PMS system with appropriate redox potential . Meanwhile, Co and Fe elements doped in CN also could effectively activate PMS and promote the generation of active species. Besides, the continuous generation of photogenerated electrons promoted the cycling of Co 3+ /Co 2+ and Fe 3+ /Fe 2+ , and further enhanced the degradation efficiency of Co/Fe-CN/Vis/PMS towards Levofloxacin (LVFX). LVFX could be rapidly removed, reaching 92.1% within 50 min under visible light illumination, and the kinetic rate constant of LVFX was 0.0638 min -1 . The quenching experiments verified that the 1 O 2 was the main active species in the reaction process. The cycling experiments revealed that the Co/Fe-CN/Vis/PMS system had favorable stability and applicability. This work provides a simple preparation method to fabricate bimetallic co-doped CN for the enhancement of degradation rate in the Photocatalyst/Vis/PMS system.
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DOI
高影响因子
SOLID STATE SCIENCES
·
2020
·
IF 2.434
Xiaofang Li,Yuandong Wu,Dajiang Mei,Hagen Poddig,Thomas Doert
Three hexasodium transition metal sulfates, Na 6 M (SO 4 ) 4 ·2H 2 O ( M = Fe, Co, Ni) were obtained by a dissolution and precipitation route and by hydrothermal reactions . The compounds were characterized by single crystal X-ray diffractions, UV/vis and IR spectroscopy , thermal analyses, and magnetization measurements. The title compounds all crystallize in the triclinic space group P 1 ‾ (No. 2) with Z = 1 and lattice parameters : a = 6.0679(8), b = 6.8658(8), c = 10.1508(12) Å, β = 92.557(4)° for Na 6 Fe(SO 4 ) 4 ·2H 2 O; a = 6.0595(5), b = 6.8446(6), c = 10.1149(8), β = 92.548(2)° for Na 6 Co(SO 4 ) 4 ·2H 2 O; a = 6.0490(4), b = 6.8265(5), c = 10.0793(7), β = 92.5470(10)° for Na 6 Ni(SO 4 ) 4 ·2H 2 O, respectively. [M(SO 4 ) 4 ] 6- anions are interconnected by hydrogen bonds to form two-dimensional layers in these structures. The solid-state UV/vis/NIR diffuse reflectance spectroscopy indicates that Na 6 M (SO 4 ) 4 ·2H 2 O ( M = Co, Ni) are insulators. Magnetization experiments show a nearly linear temperature dependence of the inverse susceptibility down to 2 K, which indicates a paramagnetic behavior for all three compounds.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Gaoxia Mei,Lili Cui,Zhiyu Dou,Xingquan He
Developing robust dual-function oxygen electrode reaction catalysts is vital toward renewable/rechargeable energy systems but remains challenging. In this work, novel electrocatalytically active hybrid materials comprising Fe 0.5 Co 0.4 Ni 0.1 alloy nanoparticles-embedded N-doped carbon nanotubes , named CNTs@(Fe,Co,Ni)PP-T (where T denotes the pyrolysis temperature employed to prepare them), are developed by pyrolyzing the mixture of hyperbranched tri-metal (Fe, Co, Ni)-coordinated polyporphyrin-encapsulated carboxylic acid-functionalized carbon nanotubes and melamine . The materials are demonstrated to act as effective bifunctional oxygen electrode catalysts. Especially, the one generated at 800 °C, termed as CNTs@(Fe,Co,Ni)PP-800, has larger specific surface area, larger active surface area and better electrical conductivity than other as-obtained contrast materials. Undoubtedly, this material displays superior reactive activity for O 2 -associated electrochemical reactions in alkaline media, delivering more positive onset (0.988 V vs . RHE) and half-wave (0.837 V vs . RHE) potentials for the reduction of oxygen and a smaller overpotential (355 mV) at 10 mA cm −2 for the evolution of oxygen than its counterparts. In practical application, the CNTs@(Fe,Co,Ni)PP-800 based zinc-air battery (ZAB) achieves a small initial charge-discharge voltage gap of 0.69 V at 2 mA cm −2 and an outstanding cycling durability in 300 cycles of charge-discharge (in over 50 h), superior to the benchmark Pt/C+RuO 2 based ZAB under the identical testing conditions.
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DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 24
·16727-16735
·
IF 3.9
Huizhong Wu,Qiong Yi,Xiang Li,Yingxi Wang,Ling Li
Low catalytic efficiency and catalyst recovery are the key factors limiting the practical application of advanced oxidation processes. In this work, a core–shell magnetic nanostructure Fe3O4@MIL-101(Fe, Co) was prepared via a simple solvothermal method. The core–shell structure and magnetic recovery performance were characterized by various technologies. The results of dye degradation experiments proved that within 10 minutes, the Fe3O4@MIL-101(Fe, Co)/PMS system can degrade more than 95% of 10 mg per L Rhodamine (RhB) at an initial pH of 7, which possesses higher catalytic activity than the Fe3O4/PMS system and the MIL-101(Fe, Co)/PMS system. The effects of initial solution pH and coexisting anions in water on the degradation of RhB were further discussed. The results showed that Fe3O4@MIL-101(Fe, Co) displayed excellent degradation efficiency in a wide pH range of 3–11 and capability of resisting coexisting anions. It is worth mentioning that after five cycles, the RhB removal rate can still be maintained at over 90% after 10 minutes of reaction. Free radical quenching experiments were further studied, confirming that ˙OH and SO4−˙ were involved in the degradation of RhB, while the dominating active free radical was SO4−˙. The possible reaction mechanism of the RhB degradation process was also inferred.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Haifeng Jiang,Wei Jia,Jiaxing Song,Meng Song,Zongyuan Zhang,Jiaxin Wang,Zhenjia Ni,Yuhang Li
The use of plastic catalytic pyrolysis technology for producing aviation fuel substitute components holds broad application prospects in mitigating fossil resource depletion and environmental pollution. In this work, Fe/Co-layered hydroxide-derived mixed metal oxides (CoAl-LDO and FeCoAl-LDO) were prepared and used to catalyze the conversion of polystyrene into aviation fuel substitute components with rich-monocyclic aromatic hydrocarbons. Compared with the CoAl-LDO, FeCoAl-LDO catalyst showed excellent catalytic conversion performance. Especially, the relative content of monocyclic aromatic hydrocarbons within the liquid product reached 63.76% under CO 2 mediation, which had an increase of 9.94% compared to the N 2 . The increase of FeCoAl-LDO mass ratio significantly promoted the generation of monocyclic aromatic hydrocarbons, which reaches its maximum value of 73.32%. In terms of liquid components, the carbon number of aromatic components primarily falls within C7-C12, aligning with the usage range for aviation fuel substitute components. And, the proportion of light aromatic hydrocarbons reached 71.58%. This research highlights the promise of the FeCoAl-LDO catalyst in the production of aviation fuel substitute components under CO 2 mediation, thereby providing vital support for the development of sustainable aviation fuel.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Xinyue Zhang,Yichu Ma,Hengqiang Yang,Chenglong Shi,Qingjun Zhou
The development of electrode materials with high catalytic activity at intermediate temperature (600–800 °C) is essential for improving the output performance of solid oxide fuel cells. Here, we report low cobalt-based Sr 2 Fe 1.5-3x Ni x Cu x Co x Mo 0.5 O 6 (x = 0.05, 0.1, 0.15, SF x NCCM) as symmetrical electrode materials. With effective control of the anode side, Fe–Co–Ni–Cu nanoparticles precipitate from and are uniformly distributed across the parent surface, enhancing the electrode material's electrochemical performance. The output performance of single cell is better than that of Sr 2 Fe 1.5 Mo 0.5 O 6-δ symmetric cell without nanoparticle modification. In addition, the maximum power densities of the single cell with ∼300 μm thick Ce 0.9 Gd 0.1 O 1.95 as electrolyte and SF x NCCM as symmetrical electrode material reached 750, 620 and 621 mW cm −2 at 800 °C, respectively. The reversibility of nanoparticles exsolution and phase structure transformation are confirmed. The in-situ self-assembled electrode materials reported in this study provide a foundation for future research on fuel cell electrodes.
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高影响因子
危险品化学品经营许可证（带存储）