WATER AIR AND SOIL POLLUTION
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2026
·Vol. 237
·期 8
·497
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IF 3.5
Yang Yuanfang,Xu Yunlan,Tang Danli,Xiang Tanxia
In this work, CoFe-layered double metal oxide (CoFe-LDO) was obtained by a co-precipitation-calcination route using CoFe-layered double metal hydroxide (CoFe-LDH) as precursor material, and then MoS 2 and chitosan-derived N-doped carbon co- modified CoFe-LDO composite catalyst (MoS 2 @CoFe-LDO/NCS) was prepared. This material was characterized by SEM, EDS, FTIR, XRD and XPS, and was synthesized to catalyze ozonation for the degradation of methylene blue (MB). The influence of CoFe-LDO dosage, O 3 flow rate, initial MB concentration, catalyst dosage, initial pH and coexisting compounds on MB removal efficiency were systematically investigated. The decomposition efficiency of 50 mg/L MB by 10%MoS 2 @CoFe-LDO/NCS reached 96.47% within 8 min under the conditions of 10% CoFe-LDO dosage (CoFe -LDO:CS), pH = 6.8, catalyst dosage of 0.4 g/L, Ozone flow rate of 1.87 mg/(L⋅min) and 25 °C. Stability tests and metal ion leaching experiments confirmed the excellent chemical stability and environmental compatibility of 10%MoS 2 @CoFe-LDO/NCS. Electrochemical characterization showed that 10%MoS 2 @CoFe-LDO/NCS possessed enhanced current density, redox activity and excellent electron transfer capability. Quenching experiments revealed that 1 O 2 , O 2 ∙ − and ∙ OH contributed to the MB degradation process, with O 2 ∙ − confirmed as the dominant reactive species.
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ELECTROCHIMICA ACTA
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2022
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IF 7.336
Min Jiang,Rui Dong,Hanxiao Liao,Yong Liu,Yuan Wang,Pengfei Tan,Jun Pan
Rational fabrication of an electrocatalyst with excellent stability, conductivity, and activity is urgently demanded for oxygen evolution reaction (OER). In this work, Ru-regulated hierarchical CoFe/CoFe 2 O 4 nanoparticles with graphitic carbon shells were successfully fabricated via self-assembling and vapor reduction strategies. Our investigation uncovers high concentrations of octahedral Co 3+ sites in electrocatalysts can be triumphantly acquired via moderate Ru doping, which could give rise to excellent electrocatalytic activities during OER. In addition, the design of CoFe alloys and graphitic carbon shells can compensate for the weak conductivity of cobalt ferrites. Based on the intrinsic stability, improved conductivity and activity, the as-prepared electrocatalyst yields a low overpotential of 237 mV at 10 mA cm −2 and a small Tafel slope of 47 mV dec −1 in 1.0 M KOH electrolyte, exhibiting outstanding electrocatalytic activities for OER.
研究领域:
材料科学
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电化学
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CHEMICAL ENGINEERING SCIENCE
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2023
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IF 4.7
Jinhui Zhang,Jianglin Liu,Bowen Liu,Xuliang Lin,Yanlin Qin
The development of low-cost and efficient bi-functional electrocatalysts are still the main challenging for oxygen reduction reactions (ORR) and oxygen evolution reactions (OER) in zinc-air batteries. In this work, CoFe-Co x N heterojunction nanocatalyst encapsulated by N-doped biochar was synthesized by combining carboxylated lignin with metal ions via self-assembly and in situ pyrolysis reduction. The heterojunction endowed the superior oxygen electrocatalytic performance, and the carbon-encapsulated structure improved the stability and corrosion resistance in electrolyte. It exhibited a positive half-wave potential of 0.79 V for ORR and a low overpotential of 404 mV at 10 mA cm −2 for OER. The corresponding zinc-air battery displayed a high-power density of 178 mW·cm −2 and excellent stability. DFT calculation indicated that the existence of CoFe-Co x N and the N-doped carbon layer could improve the electron transfer efficiency. This study demonstrated a viable and eco-friendly design for alloy and nitride heterojunction electrocatalysts for energy conversion by using lignin-metals complex.
研究领域:
材料科学
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电化学
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能源转换
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DIAMOND AND RELATED MATERIALS
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2023
·
IF 4.1
Yuanchun Zhang,Shengtao Gao,Jun He,Feng Wei,Xingzhao Zhang
Achieving a wide effective absorption bandwidth in 8.0–18.0 GHz under ultrathin thickness (d < 2.0 mm) with a low filler ratio is difficult. Herein, Co/Fe metal–organic framework (MOF)-derived CoFe@C composite-decorated residual carbon (CoFe@C/RC) hybrids collected from coal gasification fine slag (CGFS) by removing the inorganic oxide components were synthesized via a technology by modulating the molar ratio of Co/Fe. The physicochemical properties of the synthesized CoFe@C/RC with different molar ratios of Co/Fe were studied via various analytical techniques, and then the electromagnetic parameters associated with the above research results were analyzed. The defects, microstructure and electromagnetic wave absorption (EMWA) performance of CoFe@C/RC changed with the change in the Co/Fe molar ratio. Impressively, the Co 1 Fe 3 @C/RC hybrids exhibited excellent EMWA capacity . Under a filler content of 20 %, the ternary hybrid with a molar ratio of Co/Fe of 1:3 showed a minimum reflection loss ( RL min ) of −20.0 dB and a broad absorption bandwidth ( f e, RL ≤ −10 dB) of 3.95 GHz at a thickness of 1.7 mm. Importantly, the ultrabroad f e reached 10.0 GHz (8.0–18.0 GHz); it covered the whole Ku and X bands by simply adjusting the thicknesses of the CoFe@C/RC absorber in 1.5–3.0 mm. The CoFe@C/RC hybrids possessed outstanding EMWA because of the excellent effective synergy of magnetic and dielectric losses. This work realizes the high-value application of coal gasification solid waste and offers an efficacious strategy for creating novel CGFS residual carbon-based ultrathin EMW absorbing materials at 8–18 GHz.
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ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Dongdong Wang,Lili Liu,Yue Liu,Wenhao Luo,Yaojia Xie,Tiantao Xiao,Yinhu Wang,Zhihui Song,Heng Zhang,Xindong Wang
The lack of highly efficient and long-term stable catalysts for the oxygen evolution reaction (OER) severely hampers the advancement of alkaline seawater electrolysis. Herein, a hierarchical superaerophobic OER catalyst electrode, FeOOH/CoFe layered double hydroxide (FeOOH/CoFe LDH), has been prepared on nickel foam through a one-step hydrothermal reaction as an efficient OER catalyst for alkaline seawater electrolysis. The hierarchical nanostructure provides abundant active sites for the catalyst; the superaerophobic property ensures sufficient contact between the catalysts and the electrolyte, and the interaction between FeOOH and CoFe LDH further enhances the OER activity. The FeOOH/CoFe LDH catalytic electrode exhibits remarkable OER performance in simulated seawater solution (1.0 M KOH + 0.5 M NaCl). Specifically, at an industrial current density of 400 mA cm–2, the overpotentials are just 320 mV at 25 °C and 257 mV at 60 °C. Meanwhile, after 300 h of stability testing at a current density of 100 mA cm–2, the overpotential of the electrode increases by a mere 19 mV. This work will afford a simple approach for designing effective electrodes for alkaline seawater electrolysis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yalun Ku,Kuikui Zhang,Ying Guo,Shulong Chang,Yu Yan,Guangsong Zheng,Han Gao,Dongsheng Song,Xun Yang,Shaobo Cheng,Lin Dong,Chongxin Shan
The urgent need to develop efficient, durable, and cost-effective oxygen evolution reaction (OER) catalysts for energy conversion and storage has prompted extensive research. Currently available commercial noble metal-based OER catalysts are expensive and exhibit limited long-term stability. In this study, boron-doped diamond composites (BDDCs) consisting of CoFe and CoFe 2 C nanoparticles supported by boron-doped diamond (BDD) particles have been prepared. The BDDC catalyst, prepared through a straightforward annealing process, exhibits exceptional durability (up to 72 h at 10 mA cm −2 ), a low overpotential (306 mV at 10 mA cm −2 ), and modest Tafel slope (58 mV dec -1 ). The coherent interfaces between CoFe/CoFe 2 C nanoparticles and the BDD substrate are essential for enhancing the OER performance. The fabrication method and composite structures presented in this study may facilitate the design and production of promising catalysts.
研究领域:
材料科学
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电化学
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能量转换与存储
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
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IF 10.319
Runrun Cheng,Yan Wang,Xiaochuang Di,Zhao Lu,Ping Wang,Xinming Wu
At present, the problem of electromagnetic wave (EMW) pollution is critical, and the design of high-performance absorbers is of great significance. Based on the synergy between dielectric and magnetic losses, and between multicomponents in heterostructures, the development of light-weight absorbers with a strong absorption capability and multiple scattering is a promising strategy to achieve high-performance absorbers. In this work, CoFe-MOF precursors with a bouquet-like structure were prepared via the hydrothermal method, and Co 7 Fe 3 /C and Co 9 S 8 /Fe/CoS 2 /C composites were obtained through a carbonization and sulfuration treatment during the high-temperature pyrolysis process, respectively. The experimental and theoretical results show that the Co 9 S 8 /FeCoS 2 /C composite has a better EMW absorption performance, and its optimal reflection loss (RL) value is -53.9 dB at a low filler loading of 20 wt.%, which is due to the S doping that enhances the interface polarization relaxation process and improves the impedance matching characteristics. Moreover, the Co 9 S 8 /FeCoS 2 /C composite can be as candidates of high-efficiency absorbers in extreme application environments.
研究领域:
材料科学
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电磁学
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环境科学
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复合材料
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ENERGY & FUELS
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2025
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IF 5.3
Yunyun Xie,Guanghua Liu,Zongwang Rao,Zhifang Xu,Jun Zhu,Chao Jiang,Yulong Yang,Zhiwen Hu,Qibing Chang
Fabricating an inexpensive and efficient electrocatalyst for the electrocatalytic oxygen evolution reaction (OER) in an alkaline medium is crucial for renewable energy generation. In this work, nickel foam (NF) modified with few-layer or single-layer MXene (S-MXene) was used as a substrate to prepare an independent, self-supporting composite electrode for oxygen evolution reaction (OER) catalysis. CoFe bimetallic MOF nanosheets were grown in situ on composite substrates by electrodeposition. Compared to multilayer MXene, S-MXene has a larger specific surface area and interlayer spacing, making it an ideal material for enhancing the conductivity of the electrode or serving as a supporting matrix. As an intermediate material, S-MXene can not only reduce the charge transfer resistance of the electrode and improve the active sites but also enhance the structural stability of the electrode, significantly improving the catalytic activity and long-term electrolysis stability of the electrode. The improved CoFe NSs@S-MXene/NF composite electrode delivers a current density of 10 mA cm–2 at a low overpotential value of only 191 mV in 1.0 M KOH, along with an ultralow Tafel slope of 31 mV dec–1. Additionally, the composite electrode exhibits outstanding stability for 24 h during OER at various current densities. This work innovatively uses S-MXene as a base material and develops a highly efficient new type of OER electrode. This novel strategy can serve as a reference for the modification of other electrode materials and expand the application of MXene in the field of water splitting.
研究领域:
电化学
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材料科学
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能量转换
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纳米材料
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催化
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Rong Yang,Yimeng Zhou,Yingying Xing,Di Li,Deli Jiang,Min Chen,Weidong Shi,Shouqi Yuan
Developing active, stable and cost-effective bifunctional electrocatalysts with earth-abundant metals (Ni, Fe, Co) is a prerequisite to achieve overall water splitting. In this work, a novel CoFe-layered double hydroxide (LDH) coupled with NiFe-LDH nanosheet array supported on nickel foam (denoted as CoFe@NiFe/NF) is developed through a facile hydrothermal and electrodeposition method. Remarkably, benefiting from strong synergistic effect between CoFe-LDH and NiFe-LDH and the unique structural features, the resulting CoFe@NiFe/NF architectures catalyst exhibits excellent activities and stabilities for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Furthermore, an efficient and stable alkali-electrolyzer using CoFe@NiFe/NF as both the cathode and anode achieve a voltage of 1.59 V at the current density of 10 mA cm −2 , which is superior to many other state-of-the-art earth-abundant electrocatalysts. This work provides a facile method for enhancing the electrocatalytic activity by constructing hierarchical core-shell architectures using the LDH nanosheet materials.
研究领域:
材料科学
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电化学
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
·
IF 9.6
Xiaobo Feng,Boding Zhang,Tong Wu,Hao Jin,Deju Yuan,Anjia Deng,Dong Liu,Likun Pan,Tianjun Ni
Co Fe dual single-atom sites tailor electronic structure to boost PMS activation. • 97.7% ± 2.6% tetracycline removal in 15 min ( k = 0.22 min −1 ), outperforming single-atom catalysts. • Fixed-bed reactor sustains ∼95% tetracycline removal for 120 h with lower ecotoxicity. Single-atom catalysts (SACs) for peroxymonosulfate (PMS) activation are often constrained by the limited electronic tunability of isolated mono-metal centers, which weakens oxidant adsorption and interfacial charge transfer. Herein, we overcome this limitation by constructing a Co Fe dual single-atom catalyst anchored on a nitrogen-doped carbon aerogel (Co–Fe/NCNA) for visible-light-assisted tetracycline degradation. Spectroscopic and synchrotron analyses confirm that atomically dispersed Co N 3 and Fe N 4 sites coexist within a hierarchically porous three-dimensional carbon framework, ensuring high active-site accessibility and rapid mass transport. The Co–Fe/NCNA system achieves 97.7% ± 2.6% tetracycline (TC) removal within 15 min ( k = 0.22 min −1 ), dramatically outperforming single-metal and metal-free analogues. Density functional theory calculations indicate that the coupled Co Fe sites reconstruct the local electronic structure, elevate the d-band center, strengthen PMS adsorption, and reduce the activation barrier for PMS conversion to 0.30 eV. The TC degradation proceeds through a cooperative radical/nonradical oxidation network, in which h + -mediated oxidation acts as the primary apparent pathway, while 1 O 2 , ·O 2 − , ·OH, SO 4 · − , and possible high-valent metal-oxo-like species contribute synergistically or serve as auxiliary pathways. Notably, a fixed-bed continuous-flow reactor sustains ∼95% tetracycline removal over 120 h, and outstanding activity is retained under natural sunlight. This work establishes electronic structure engineering of dual single-atom sites as a powerful strategy to boost visible-light-driven PMS activation for sustainable water remediation. Under visible-light irradiation, the Co Fe dual single-atom sites regulate the local electronic structure, optimize the d-band center, and promote photogenerated charge separation and interfacial electron transfer, thereby enabling efficient peroxymonosulfate (PMS) activation. Through the synergistic cooperation of electron-mediated PMS reduction, hole-mediated PMS oxidation, and Co/Fe self-cycling, radical and non-radical reactive species are generated to construct an integrated oxidation network, which drives the efficient degradation and mineralization of tetracycline. Download: Download high-res image (401KB) Download: Download full-size image
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高影响因子
CRYSTENGCOMM
·
2026
·
IF 2.4
Qi Chen,Hongwei Duan,Yan Song,Yaning Guo,Hongge Zhang,Feng Zhang,Xiaobin Hu,Yinfeng Han
The rational design of hierarchical Co-Ni-Fe-based inorganic materials is of great significance for functional electrochemical applications. Here, a self-supported Co2(OH)2CO3@CoFe-LDH hierarchical heterostructure was constructed in-situ on a conductive nickel foam substrate via a one-step hydrothermal method. A prominent structural feature is that Co2(OH)2CO3 nanoneedles are uniformly and radially anchored on the surfaces of CoFe-LDH nanosheets, which effectively suppresses nanoneedle aggregation. By systematically tuning the Co2+/Fe3+ molar ratio, the effects of composition on phase selectivity, nucleation behavior, and morphological evolution in the multimetallic system were elucidated. The results reveal that CoFe-LDH nanosheets preferentially form at moderate Co2+/Fe3+ ratios, whereas further increasing the Co2+ content leads to heterogeneous nucleation of excess Co2+ species on the LDH surface and induces the directional growth of Co2(OH)2CO3, thereby giving rise to the hierarchical heterostructure. The resulting self-supported electrode exhibits stable oxygen evolution reaction performance under alkaline conditions. In situ Raman spectroscopy reveals a potential-dependent surface reconstruction, evidenced by the attenuation of precursor-related metal-oxygen vibrations and the formation of (oxy)hydroxide species at the heterointerfaces, highlighting the correlation between multimetallic composition regulation and interfacial structural evolution.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2025
·
IF 14.3
Yunmin Zhao,Lihong Wang,Zhilong Liu,Jianxin Ren,Haojin Wang,Jianqiao Hu,Hongtao Guan,Yude Wang
One-dimensional (1D) carbon nanofibers with unique three-dimensional (3D) network structure and high electrical conductivity are an important microwave absorbing material. However, due to poor impedance matching and single loss mechanism, its effective absorption bandwidth (EAB) is limited. Therefore, in this work, a porous hollow carbon fiber is designed using coaxial electrostatic spinning, and the magnetic component CoFe alloy is introduced during high temperature sintering to prepare porous CoFe hollow carbon fiber composite (CF@HCF). Its unique 1D nanostructure and 3D interconnected structure facilitates multiple reflection losses of electromagnetic waves within the material. In addition, the presence of porous and hollow structures increases heterogeneous interfaces and surface area. The introduction of magnetic components on carbon fibers not only increases the magnetic loss, but also forms a variety of heterogeneous interfaces. In addition, the porous hollow structure improves the spatial efficiency and porosity of the composites, thus optimizing impedance matching. The results indicate that, at a filler ratio of 25 wt%, the EAB reaches 7.04 GHz, with a minimum reflection loss (RL min ) of −50.04 dB under a matching thickness of 2.4 mm. In addition, to extend practical applications, CF@HCF composite membrane with excellent flexibility was prepared using PDMS encapsulation technology, and the sample also shows an average electromagnetic shielding performance of >30 dB. Besides, the radar cross section (RCS) values are below −10 dB m², demonstrating the material's significant radar wave attenuation capability and practical application potential. This work provides some perspectives on the preparation of hollow carbon fiber magnetic powder composites, and lays the foundation for the application of magnetic carbon-based composites.
研究领域:
材料科学
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电磁学
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危险品化学品经营许可证（带存储）