Nano Research
·
2020
·Vol. 13
·期 4
·1090-1099
·
IF 8.183
Wang Yiyan,Kumar Anuj,Ma Mang,Jia Yin,Wang Yu,Zhang Ying,Zhang Guoxin,Sun Xiaoming,Yan Zifeng
Carbon materials featuring hierarchical pores and atomically dispersed metal sites are promising catalysts for energy storage and conversion applications. Herein, we developed a facile strategy to construct functional carbon materials with a fluffy peony-like structure and dense binary FeCo-N x active sites (termed as f-FeCo-CNT). By regulating the metal content in precursors, a three-dimensional (3D) interconnected conductive carbon nanotubes network was in-situ formed throughout the atomically dispersed FeCo-NC matrix during pyrolysis. Taking advantage of rich pore hierarchy and co-existence of highly active FeCo-N x sites and beneficial FeCo alloy nanoparticles, the f-FeCo-CNT material exhibited excellent bifunctional performance towards oxygen reduction reaction/oxygen evolution reactions (ORR/OER) with respect to the atomically dispersed FeCo-NC (SA-f-FeCo-NC) and commercial Pt/C+RuO 2 mixture, surpassing the SA-f-FeCo-NC with a 20 mV higher ORR half-wave potential and a 100 mV lower OER overpotential (at 10.0 mA/cm 2 ). Remarkably, the f-FeCo-CNT-assembled Zn-air battery (ZAB) possessed a maximum specific power of 195.8 mW/cm 2 , excellent rate capability, and very good cycling stability at large current density of 20.0 mA/cm 2 . This work provides a facile and feasible synthetic strategy of constructing low-cost cathode materials with excellent comprehensive ZAB performance.
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高影响因子
Nanoscale
·
2025
·
IF 5.1
Jialong Jiang,Shida Han,Yuan Ji,Hong Wu,Shaoyun Guo
The coupled problems of heat dissipation and electromagnetic compatibility need to be addressed urgently in highly miniaturized and integrated electronic devices. Herein, polydimethylsiloxane (PDMS) composites featuring core-sheath FeCo@vertically aligned carbon fiber (VACF) arrays were prepared via magnetic field-assisted vertical alignment, combined with in-situ high-temperature growth and infiltration processes. Within the composite, the VACF arrays provide efficient phonon transport pathways in the through-plane direction, while the magnetic FeCo alloy shells function to isolate the VACF arrays, optimizing impedance matching and enhancing electromagnetic wave absorption loss. By regulating the FeCo alloy content, the through-plane thermal conductivity and total electromagnetic interference (EMI) shielding effectiveness of the composite reached 42.03 W/(mK) and 41.6 dB, respectively, while the reflection effectiveness was only 1.5 dB. This work demonstrates the FeCo@VACF/PDMS composite that simultaneously achieves ultrahigh through-plane thermal conductivity and absorption-dominant EMI shielding, providing a novel approach to designing high-performance, multifunctional thermal interface materials.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wenlu Yang,Jianing Guo,Jingyuan Ma,Na Wu,Jun Xiao,Mingxing Wu
Developing low-cost, high-efficiency and durable trifunctional electrocatalysts for enhancing the speed of oxygen reduction, oxygen evolution and hydrogen evolution reactions (ORR, OER and HER) is critical for expanding the industrial production and the commercial application of rechargeable Zn-air batteries and water electrolysis, but it still exists as a tremendous challenge. Herein, FeCo nanoalloys embedded into N-doped carbon nanofibers was prepared as a superior trifunctional catalyst for ORR, OER and HER by a universal and facile method. Under the synergistic effect of FeCo nanoalloys and N-doped carbon nanofibers , the Fe, Co/N-C catalyst exhibits half-wave potential of 0.86 V for ORR, and overpotentials of 388 mV and 249 mV at 10 mA·cm −2 for OER and HER, respectively. What’s more, the Zn-air battery based on Fe, Co/N-C catalyst displayed a considerable open-circuit voltage of 1.5 V and a continuous cycle life span of 210 h. Moreover, this catalyst was also used as the sole catalyst in overall water splitting to show excellent performance. This work provides an effective way to design efficient and durable multifunctional electrocatalysts, which will facilitate the development of high-performance multifunctional catalysts and their application in renewable energy applications.
研究领域:
材料科学
·
电化学
·
能源存储与转换
·
纳米技术
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FOOD CHEMISTRY
·
2026
·
IF 9.8
Donglin Xiang,Xiao Wang,Chun Ji,Laping He,Yuangen Wu,Han Tao
This study presents a novel electrochemical strategy for detecting organophosphorus pesticides based on the synergistic catalytic of red kidney bean esterase (RKBE) and iron–cobalt dual-atom catalyst embedded in N-doped carbon carrier (FeCo–NC). RKBE was extracted from the widely cultivated British red kidney beans ( Phaseolus vulgaris L.) . FeCo–NC exhibited excellent electrocatalytic and peroxidase-like activity, catalyzing o -phenylenediamine oxidation to produce electroactive 2,3-diaminophenazine, which served as signal probe generating a sensitive cathodic current. Notably, RKBE product 1-naphthol inhibited FeCo–NC activity, while organophosphorus pesticides counteracted this inhibition by suppressing RKBE activity, restoring the electrochemical signal of 2,3-diaminophenazine. Leveraging this signal-regulation mechanism, a dichlorvos sensor was developed, with wide linear range (50–50,000 pM), low detection limit (14 pM), and excellent real-sample recovery (93.33%–107.08%), demonstrating practical application potential. This study provides an affordable and easy-to-operate approach for large-scale on-site monitoring of organophosphorus pesticide residues in foods.
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高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Zhenzhen Wu,Xiaoyu Wu,Wenting Liu,Songfeng Liang,Jiaming Luo,Mengyang Li,Yang Wang
Zinc-air batteries, widely regarded as a frontrunner in sustainable energy storage solutions, struggle with performance constraints stemming from the insufficient activity and durability of bifunctional oxygen electrocatalysts. This research presents a composite catalyst (FeCo@Fe-N-CNTs) synthesized through a straightforward in situ growth method, effectively integrating FeCo alloys with Fe single atoms incorporated in nitrogen-doped carbon nanotubes (N-CNTs). Theoretical and experimental studies show that FeNx atoms weaken the interaction between active iron sites and reactants, enhancing the reaction energy optimization. The optimization improves the characteristics of the intermediates’ adsorption and desorption, enabling the catalyst to exhibit remarkable bifunctional activity under alkaline conditions, achieving an overall overpotential as low as 0.67 V, with overpotential of merely 290 mV for the oxygen evolution process. The performance boost stems from a 38% larger electrochemical surface area (ECSA) combined with an 18% lower charge transfer resistance (Rct), pointing to gains in both active site numbers and intrinsic catalytic efficiency. We also employed X-ray absorption spectroscopy (XAS) and in situ Raman measurements to probe the Fe–Nx bonding configuration and track how the surface changes under the working conditions. Notably, zinc-air batteries using dual-function catalyst reached a peak energy density of 894 mAh g–1, maintained stable cycling for over 3000 h, and exhibited consistent charge–discharge capabilities in flexible quasi-solid-state devices (with voltage fluctuation remaining under 5% during bending strain), highlighting its immense potential for practical use in creating compact, high-capacity rechargeable batteries that can be worn or carried around. It is like giving us the keys to unlock a world where we can seamlessly incorporate portable energy solutions for renewable energy projects.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Rui Feng,Qi-Dong Ruan,Jiu-Ju Feng,You-Qiang Yao,Lin-Mei Li,Lu Zhang,Ai-Jun Wang
Single-atom transition metal-based nitrogen-doped carbon (M−N x −C) is regarded as high-efficiency and cost-effectiveness alternatives to replace noble metal catalysts for oxygen reduction reaction (ORR) in renewable energy storage and conversion devices. In this work, rich FeCo dual-single atoms were efficiently entrapped into N -doped carbon nanocages (FeCo DSAs-NCCs) by simple pyrolysis of the bimetallic precursors doped zeolitic imidazolate framework-8 (ZIF-8), as affirmed by a series of characterizations. The graphitization degree of the N -doping carbon substrate was regulated by modulating the pyrolysis temperature and the types of the metal salts. The typical catalyst substantially improved the alkaline ORR performance, with the onset potential ( E onset ) of 0.99 V ( vs . RHE) and half-wave potential ( E 1/2 ) of 0.88 V ( vs . RHE). Ultimately, the catalyst-assembled Zn-air battery possessed a higher open-circuit voltage of 1.501 V, larger power density of 123.7 mW cm −2 , and outstanding durability for 150 h. This study provides a guide on developing ORR catalysts for electrochemical energy conversion and storage technology.
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CHEMOSPHERE
·
2023
·
IF 8.8
Zilong Zhao,Shuyu Qi,Jianli Zhou,Yatao Ren,Kaiyun Zheng,Jin Zhang,Wenyi Dong,Hongjie Wang
To enhance the polarization distribution of electron cloud density on the catalyst surface, we have introduced a novel bimetallic-substituted dual-reaction center (DRC) catalyst (FeCo-γ-Al 2 O 3 ) comprising iron (Fe) and cobalt (Co) for the decomplexation and mineralization of heavy metal complex Ni-EDTA in this study. Compared to the catalysts doped solely with Fe or Co, the bimetal-doped catalyst offered several advantages, including enhanced electron cloud polarization distribution, additional electron transfer pathway, and improved capacity of free radical generation. Through DFT calculations and EPR tests, we have elucidated the influences of the catalyst's adsorption toward Ni-EDTA and its decomplexation products on the electron transfer between the pollutant and the catalyst. The competition between the pollutants and H 2 O 2 affects the generation of free radicals in both electron-rich Fe and Co centers as well as electron-deficient Al center. Building on these findings, we have proposed a plausible removal mechanism of Ni-EDTA using the heterogeneous Fenton-like catalyst FeCo-γ-Al 2 O 3 . This study sheds light on the potential of FeCo-γ-Al 2 O 3 as a DRC catalyst and emphasizes the significance of pollutant characteristics in determining the catalyst's performance.
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 3
·1617-1628
·
IF 11.9
Meng Ma,Wenqin Shao,Qindan Chu,Wenting Tao,Si Chen,Yanqin Shi,Huiwen He,Yulu Zhu,Xu Wang
With the strong support of the government for emerging technology industries, electromagnetic waves have brought convenience to people's lives, but also become an undeniable new source of pollution. Therefore, it is vital to develop new high-performance electromagnetic shielding materials. Herein, we designed a well-structured asymmetrical gradient multilayer composite film by constructing a controllable electromagnetic gradient. Using cellulose nanofibers as the matrix, a layer-by-layer filtration method was used to rationally distribute FeCo@rGO and MXene fillers to build an ordered multilayer structure that provides alternating conductive and magnetic gradients. Owing to gradient absorption shielding and reflection mechanisms for electromagnetic waves within the film layer, the EMI shielding efficiency (EMI SE) of the asymmetrical gradient alternating six-layer composite film reached 45.2 dB (X-band), and the reflection coefficient was reduced to 0.71 when 20 wt% filler was added. In addition, this composite film has good thermal conductivity and mechanical properties, exhibiting thermal conductivity of 2.90 W (m−1 K−1) and tensile strength of 26.2 MPa. This strategy provides a feasible approach for designing electromagnetic shielding composite materials with adjustable electromagnetic properties and has significant practical significance in expanding the application of MXene-based composite materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Xinqi Han,Zihan Lin,Xingquan He,Lili Cui,Dongxiao Lu
Here, Fe, Co-layered double hydroxide and polyaniline composites onto nickel foam (NF) (FeCo-LDH/PANI) were fabricated via one-step co-electrodeposition method. The test results indicate the co-existence of the amorphous structure and the smaller size of crystal district with more defects in optimal FeCo-LDH/PANI. Importantly, it is found that there are more defects in FeCo-LDH/PANI compared to that of FeCo-LDH possibly attributed to the local etching of H + released from the polymerization of aniline. Benefitting from the numerous defects, higher electrochemical surface area (ECSA), lower charge-transfer resistance and electron interaction, the optimized FeCo-LDH/PANI needs the overpotentials of 104, 246, 285 and 323 mV vs RHE for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) to achieve 10 and 100 mA cm −2 , and shows desirable stability. Noticeably, the optimal FeCo-LDH/PANI requires a cell voltage of 1.53 V to drive 10 mA cm −2 for the whole water splitting.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Chun-Yang Li,Lu Yang,Jing Wang,Shi-Wen Lv,Jin Wang,Jing-Min Liu,Shuo Wang
For several decades, toxic thermally processed hazards, represented by heterocyclic amines (HCAs), have gradually become a challenge in the field of purification owing to their increasing exposure, wide variety, and the complexity of the matrix. In this study, the first example of degradation-removal of HCAs was illustrated by using a newly-integrated Fe/Co co-doped layered double hydroxide (FeCo-LDH) as photocatalysts based on sulfate radical advanced oxidation processes (SR-AOPs). Under the excitation of UV light, a FeCo-LDH/sodium persulfate (PS) photocatalytic degradation system combined with ultra-performance liquid chromatography mass spectrometer (UPLC-MS) was established. The synthesized photocatalysts were optimized by varying the Fe/Co ratio, and a series of photochemical activities and reaction conditions were investigated for a better performance. As a result, the FeCo-LDH/PS system was able to degrade 12 kinds of common HCAs efficiently and simultaneously, and was also well applicable in real edible oil samples with completely degraded. Moreover, it exhibited well reusability, preserving 97.75% of initial activity after being used for 5 cycles. It is the first application of photocatalytic combined with SR-AOPs technology for the degradation of HCAs and provides a promising example for the regulation of thermally processed hazards.
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120795
·
IF 7.2
Xiaolin Shi,Bo Xing,Guo Yang,Yi Wang,Pan Huang,Fuping Zhang,Qing Yang,Hangdao Qin,Ping Yang,Caiyi Jiang,Xingyong Liu
Polyvinylidene fluoride (PVDF) membrane filtration is extensively employed in the treatment of fluoride-containing wastewater due to low cost and operational simplicity. However, it still faces the challenges of unsatisfactory permeability and anti-pollution performance. In the present work, a novel PVDF ultrafiltration membrane modified with FeCo/BC (FeCo/BC@PVDF) that exhibits outstanding catalytic activity was fabricated via the non-solvent-induced phase separation (NIPS) method, which further enables the in-situ coupling between the as-fabricated membrane and peroxymonosulfate (PMS). The performance evaluation exhibits that the pure water flux and rejection rate of FeCo/BC@PVDF ultrafiltration membrane increased from 235.91 L⋅m −2 ⋅h −1 and 51.63 % to 445.61 L⋅m −2 ⋅h −1 and 90.71 %, and the irreversible pollution rate has decreased from 37.69 % to 17.67 % in in-situ coupling PMS systems. Meanwhile, the characterization results of XRD, FTIR, SEM, XPS and water contact angle (WCA) confirmed that the outstanding permeability and anti-pollution performance were attributed to good pore distribution, hydrophilicity and catalytic performance. In addition, the pollution model fitting, extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory and heterogeneous experiments were used to further understand the anti-pollution mechanism of FeCo/BC@PVDF, and the results reveal that pollution mode of ultrafiltration membrane has changed from multiple contamination behaviors to easily rinsed cake layer contamination because of the in-situ degradation effect of SO₄⁻•, O₂⁻• and •OH on sodium p-perfluorous nonenoxybenzenesulfonate (OBS). This research provides a new idea for simultaneously improving the permeability and anti-pollution performance of PVDF ultrafiltration membranes in the field of fluorine-containing wastewater treatment.
研究领域:
环境科学与技术
·
膜科学与工程
·
水处理
·
高级氧化技术
·
材料科学
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高影响因子
Science China-Materials
·
2020
·Vol. 63
·期 7
·1182-1195
·
IF 6.098
Wang Yiyan,Zhang Guoxin,Ma Mang,Ma Yan,Huang Jiankun,Chen Chen,Zhang Ying,Sun Xiaoming,Yan Zifeng
An atomically dispersed FeCo-NC material with the 3D flower-like morphology was used as a unique substrate for the controllable deposition of ultrasmall NiFe layered double hydroxide nanodots (termed as NiFe-NDs) to simultaneously promote the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The size-limiting growth of NiFe-NDs (~4.0 nm in diameter) was realized via the confinement of the 3D flower-like mesoporous structure and the rich N/O functionality of FeCo-NC. Benefiting from the distinctive structure with the simultaneously maximum exposure of both OER and ORR active sites, the NiFe-ND/FeCo-NC composite showed an ORR halfwave potential of 0.85 V and an OER potential of 1.66 V in 0.1 mol L −1 KOH at 10.0 mA cm −2 . In-situ Raman analysis suggested the activity of OER was derived from the Ni sites on NiFe-ND/FeCo-NC. Moreover, the NiFe-ND/FeCo-NC-assembled Zn-air battery (ZAB) exhibited a very small discharge- charge voltage gap of 0.87 V at 20 mA cm −2 and robust cycling stability. Furthermore, the NiFe-ND/FeCo-NC composite was also applicable for fabricating all-solid-state ZAB to power wearable electronics with superior cycling stability under deformation. Our work could enlighten a new applicable branch of atomically dispersed metal-nitrogen-carbon materials as unique substrates for fabricating multifunctional electrocatalysts.
研究领域:
材料科学
·
电化学
·
能源存储
·
催化化学
·
纳米科技
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高影响因子
危险品化学品经营许可证（带存储）