ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Zhen Huang,Zhengbing Deng,Dezhen Chen,Guoqiang Wei,Fang He,Kun Zhao,Anqing Zheng,Zengli Zhao,Haibin Li
Chemical looping steam reforming (CLSR) is a novel technology for hydrogen production using metal oxide as an oxygen carrier (OC). During the CLSR, the OC (MeO) is first reduced to the final state (Me) by fuel, and then the reduced OC (Me) decomposes the water vapor to produce hydrogen, while it recovers part of the lattice oxygen to the intermediate state (MeO1−δ); finally, the intermediate OC recovers the remaining lattice oxygen into the initial state (Me) under air atmosphere. This work is to explore the reactivity of NiFe2O4 OC during the CLSR based on the thermodynamic predictions and experimental analysis. The thermodynamic analysis shows that the metallic Fe can reduce steam (H2O) to produce H2, and it can recover part of the lattice oxygen into FeO/Fe3O4 species, while the metallic Ni cannot recover lattice oxygen under steam atmosphere. The TG experiments show that sequence of H2 production capacity of four reduced OCs is described as follows: metallic Fe > Fe(Ni) alloy > mixture of metallic Fe and Ni ≫ metallic Ni. The H2 production capacity of the OC mainly depends on its reduction state. A more drastic reduction degree of OC implies a higher production capacity of H2. Compared with the Fe2O3, the NiFe2O4 is more suitable for the CLSR because it has the strongest oxidation performance, facilitating deep reduction of OC in a relatively short reaction time. Because of the formation of a good dispersibility between the iron atom and the nickel atom, introduction of the inert alumina can effectively inhibit collapse of the spatial structure and sintering of the single NiFe2O4, evidently improving the reactivity and recyclability of the OC particles. The H2 production capacity of the mixed OC (NiFe2O4 + Al2O3) was stable at ∼400 mLH2/gOC within the 20 cycles. XRD patterns show that a part of Ni0 can recover lattice oxygen even under steam atmosphere due to the presence of the synergistic effect of Fe–Ni. Consequently, the NiFe2O4 is a good OC candidate for H2 production during the CLSR.
研究领域:
化学工程
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材料科学
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能源技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Guanshu Zhao,Jing Ding,Fanyang Zhou,Xueqi Chen,Liangliang Wei,Qingwei Gao,Kun Wang,Qingliang Zhao
Inefficient utilization of photo-induced charge carriers and low recyclability are limitations for photocatalyst to get access to the practical application. A novel ternary BiVO 4 /g-C 3 N 4 /NiFe 2 O 4 composite with dual Z-scheme heterojunction was successfully developed and constructed to enhance the separation of photo-induced charge carriers and the absorption range of visible light. The structure, composition, morphology, magnetic, and optical properties of this photocatalyst were investigated comprehensively. The photocatalytic performance, mechanism, and pathway of ofloxacin degradation under visible light were studied. Results indicated that the internal interaction between different semiconductors presented the successful fabrication of ternary composite, and its red shift of adsorption range of visible light contributed to an enhancement of photocatalytic ability. The as-prepared ternary composite exhibited highest photocatalytic removal rate constant for ofloxacin, which was 3.8, 16.3 and 71.2 times as much as that of the pure BiVO 4 , pure g-C 3 N 4 and pure NiFe 2 O 4 , respectively. The five successive recycling experiments exhibited the high photocatalytic stability of the as-prepared catalyst, with simple recovery operation due to its magnetic property. The holes and superoxide radicals dominated the photocatalytic degradation process of pollutants. A dual Z-scheme heterojunction other than conventional heterojunction was responsible for the enhancement on redox capacity and the separation of charge carriers. Different transformation products during ofloxacin photocatalytic degradation were identified and transformation pathway was put forward. This study provides a promising strategy on the application of visible-light-driven photocatalysts in water treatment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
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IF 5.5
Kui Yan,Ruixin Chen,Qi Ling,Ziwei Zhao,Zihan Zhou,Xuan Li,Jianguo Lv,Chunbin Cao,Gang He,Zhaoqi Sun,Miao Zhang
This research presents an innovative approach to the in-situ fabrication of Mn-doped NiFe 2 O 4 (Mn-NiFe 2 O 4 ) nanosheet arrays directly on nickel foam substrates. The formation of precursors on the nickel foam substrates is achieved through spontaneous corrosion, followed by a thermal treatment to form the Mn-NiFe 2 O 4 nanosheet arrays. The material's structure and morphology were thoroughly examined, revealing that the addition of Mn transforms the nanoporous structure on the nickel foam into a nanosheet structure. The average thickness of the nanosheets is 30 nm, and their primary composition is Mn-doped NiFe 2 O 4 . The resulting highly porous structure of these nanosheets provides numerous active sites and effective electron and ion diffusion channels, thereby increasing charge density and mechanical stability. Electrochemical assays show that the areal-specific capacity of the synthesized electrode material reaches 4.34 C cm −2 (areal-specific capacitance is 8.68 F cm −2 ) at 1 mA cm −2 . Notably, the constructed hybrid supercapacitor achieves a power density of 544 µW cm −2 at an energy density of 390 µWh cm −2 . Furthermore, capacitance retention is 95.2% after 5000 charging cycles. Additionally, the assembled device delivers robust and sustained energy output for LED displays and electric toy cars. This method streamlines the production flow of electrode materials, reducing energy consumption while significantly enhancing the areal capacitance of supercapacitors. The assembled hybrid supercapacitor structure diagram and the assembled devices provide power sources for electric toy cars and LED displays.
研究领域:
材料科学
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电化学
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纳米技术
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2019
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IF 3.206
Liyang Du,Xuedong Wang,Tingting Liu,Jieyi Li,Junxia Wang,Ming Gao,Huili Wang
Herein, we developed a novel three-layer nanocomposite for adsorption/extraction of organophosphorus pesticides in fruit juice samples. This magnetic nanocomposite was fabricated by coating polydopamine and Mg/Al layered double hydroxides onto NiFe 2 O 4 nanoparticles , which overcomes the shortcomings of low surface area and easy agglomeration associated with conventional Fe-based crystal nanoparticles. Additionally, the higher dispersibility of polydopamine and larger specific surface area of Mg/Al layered double hydroxides are conducive to rapid dispersion and efficient adsorption of organophosphorus pesticides by the synthesized nanocomposites, thereby greatly improving the efficiency of magnetic solid-phase extraction. The extraction method based on as-synthesized nanocomposites provided average extraction recoveries of 84.9% for methamidophos , parathion and phoxim , an increase of ca. 30% and 19% over those of NiFe 2 O 4 and NiFe 2 O 4 @polydopamine, respectively. The main operational parameters were firstly screened and then optimized using Plackett-Burman and central-composite design, respectively. Under optimized conditions, this proposed method yielded low detection limits (0.06–0.13 μg L − 1 ) and high intra- and inter-day precisions (2.7–4.5%). Average extraction recoveries for organophosphorus pesticides were 81.8–94.4% in grape, apple, orange, peach and mango fruit juices. To sum up, it integrates highly efficient preconcentration/extraction/dispersion, as well as rapid separation/collection into one synchronous step, satisfies the technical requirement of modern analytical pretreatment and thus enriches the multi-functional application of Fe-based nanoparticles.
研究领域:
分析化学
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环境科学
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食品科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Guowei Wang,Hefa Cheng
In recent decades, the overuse and misuse of antibiotics have caused serious harm to aquatic ecosystems . This work successfully designed a unique recyclable WO 3 /NiFe 2 O 4 /BiOBr (WNB) composite with dual Z-scheme heterojunction to degrade levofloxacin (LEV) in aqueous solution. The results indicated that the as-prepared WNB composite displayed the greatest sonocatalytic activity for LEV degradation. In particular, WNB showed the highest LEV (at 10 mg/L) removal efficiency (97.97 %) within 75 min under ultrasonic irradiation. The significantly enhanced catalytic activity of WNB was attributed to the unique dual Z-scheme structure, which makes it easier for the transfer and the spatial separation of photo-generated electron-hole (e − -h + ) pairs, and dramatically increases the carrier lifespan. Furthermore, the ternary composite comprises three different semiconductors from narrow to broad bandgap, which are suitable for harvesting full-spectrum light. The recycle experiments demonstrated the catalyst's excellent sonocatalytic stability and easy recovery, which is attributed to its magnetic property. Furthermore, based on the intermediates identified during the degradation process, a potential mechanism and pathway for LEV degradation were presented. This work provides a unique perspective on designing efficient sonocatalysts for environmental remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Shihu Cao,Shugang Zheng,Tianci Liu,Jinhao Liu,Yaqi Yin,Dan Feng,Yunqing Liu,Dayi Qian,Jiangwei Shang,Xiuwen Cheng
Herein, we identified interfacial oxygen vacancy-metal (O V -Ni) dual-sites within a NiFe 2 O 4 /Ni@NC composite as the definitive structural origin for dictating the selective evolution of singlet oxygen ( 1 O 2 ) from peroxymonosulfate (PMS) activation. The catalyst was fabricated via in-situ pyrolysis of a Ni-MOF on NiFe 2 O 4 nanoparticles, and its mechanism was elucidated through a combination of in-situ spectroscopy, kinetic analysis, and density functional theory (DFT) calculations. This 1 O 2 -driven catalysis achieved an 11-fold enhancement in the levofloxacin degradation rate, with the interfacial synergy lowering the non-radical pathway’s energy barrier by 0.037 eV. We conclude that these engineered dual-sites deterministically control reaction selectivity, as proven by the first experimental trapping of a surface-bound 1 O 2 precursor. This work establishes a design blueprint for advanced non-radical catalysts by transforming the approach from serendipitous discovery to predictable, interface-driven design.
研究领域:
环境催化
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材料化学
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物理化学
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纳米催化
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水处理技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2025
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IF 5.6
Dongya Liu,Shaohan Xing,Xiuping Chen
Interface engineering via the construction of heterojunctions to accelerate electron transfer is an effective strategy for enhancing electrocatalytic activity. This study designed and synthesized a NiFe 2 O 4 /CeO 2 Mott–Schottky (M–S) heterojunction for efficient urea oxidation reaction (UOR), which exhibits exceptional activity with a current density of 50 mA cm −2 at 1.40 V (vs. RHE). Spectroscopic analyses validate the formation of the M–S heterojunction, where a significant work function difference drives spontaneous electron transfer from NiFe 2 O 4 to CeO 2 through Ni–O–Ce bridge, thereby establishing a strong built-in electric field. This interfacial charge rearrangement precisely modulates the electronic structure of the Ni sites, enhancing initial urea adsorption and lowering the d -band center. Such modulation weakens intermediate binding and reduces the energy barrier for the rate-determining CO 2 desorption step. The utility of NiFe 2 O 4 /CeO 2 is demonstrated through reduced energy consumption in hybrid water electrolysis along with improved efficiency and longevity in urea-assisted zinc–air batteries. This study elucidates the effectiveness of M–S heterojunction engineering for developing highly efficient catalysts for advanced energy conversion and storage.
研究领域:
电化学
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催化
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材料科学
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能量转换
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纳米技术
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
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2020
·Vol. 15
·期 21
·3568-3574
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IF 4.056
Zhaoqin Fu,Shilong Liu,Zequn Mai,Zhenghua Tang,Dong-Dong Qin,Yong Tian,Xiufang Wang
Graphical A facile approach has been developed to prepare a NiFe 2 O 4 /Ni 3 S 4 heterostructure. The NiFe 2 O 4 /Ni 3 S 4 catalyst exhibited superior performance toward oxygen evolution reaction and Zn-air batteries than IrO 2 . The excellent performance is mainly attributed to the structural merits of the two components, the abundant oxygen vacancies in the catalyst, and the boosted synergistic catalytic effects occurring at the heterostructure interface. Developing high-performance catalysts for oxygen evolution reaction (OER) is critical for the widespread applications of clean and sustainable energy through electrochemical devices such as zinc-air batteries and (photo)electrochemical water splitting. Constructing heterostructure and oxygen vacancies have demonstrated great promises to boost the OER performance. Herein, we report a facile strategy to fabricate hetero-structured NiFe 2 O 4 /Ni 3 S 4 nanorods, where NiFe 2 O 4 can be derived from Fe-based metal-organic frameworks (MOFs). The NiFe 2 O 4 /Ni 3 S 4 catalyst exhibited excellent OER performance, evidenced by an overpotential value of 357 mV at the current density of 20 mA cm −2 , and a small Tafel slope of 87.46 mV dec −1 in 1 M KOH, superior to the benchmark IrO 2 catalyst. Moreover, NiFe 2 O 4 /Ni 3 S 4 outperformed with regard to long-term durability for OER than IrO 2 . Such outstanding OER performance is mainly accounted by the interface between NiFe 2 O 4 and Ni 3 S 4 , and the presence of rich oxygen vacancies. When employed as air-cathode in zinc-air batteries, the NiFe 2 O 4 /Ni 3 S 4 decorated battery had a high round-trip efficiency of 62.1% at 10 h, and possessed long-term stability of >50 h. This study may pave the way for fabricating non-noble-metal-based cost-effective, efficient and durable electrocatalysts for OER, zinc-air batteries, and beyond.
研究领域:
材料科学
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电化学
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能源存储与转换
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催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
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2022
·Vol. 12
·期 1
·1-16
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IF 4.996
Gomaa Hassanien,Abd El-Monaem Eman M.,Eltaweil Abdelazeem S.,Omer Ahmed M.
The jeopardy of the synthetic dyes effluents on human health and the environment has swiftly aggravated, threatening human survival. Hence, sustained studies have figured out the most acceptable way to eliminate this poisonous contaminant. Thereby, our investigation aimed to fabricate montmorillonite/magnetic NiFe 2 O 4 @amine-functionalized chitosan (MMT-mAmCs) composite as a promising green adsorbent to remove the cationic methylene blue (MB) and crystal violet (CV) dyes from the wastewater in neutral conditions. Interestingly, MMT-mAmCs composite carries high negative charges at a wide pH range from 4 to 11 as clarified from zeta potential measurements, asserting its suitability to adsorb the cationic contaminants. In addition, the experimental study confirmed that the optimum pH to adsorb both MB and CV was pH 7, inferring the ability of MMT-mAmCs to adsorb both cationic dyes in simple process conditions. Furthermore, the ferromagnetic behavior of the MMT-mAmCs composite is additional merit to our adsorbent that provides facile, fast, and flawless separation. Notably, the as-fabricated composite revealed an auspicious adsorbability towards the adsorptive removal of MB and CV, since the maximum adsorption capacity of MB and CV were 137 and 118 mg/g, respectively. Moreover, the isotherm and kinetic investigatins depicted that the adsorption of both cationic dyes fitted Langmuir and Pseudo 2nd order models, respectively. Besides, the advanced adsorbent preserved satisfactory adsorption characteristics with maximal removal efficacy exceeding 87% after reuse for ten consecutive cycles. More importantly, MMT-mAmCs efficiently adsorbed MB and CV from real agricultural water, Nile river water and wastewater samples at the neutral pH medium, reflecting its potentiality to be a superb reusable candidate for adsorptive removal cationic pollutants from their aquatic media.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
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IF 7.392
Haoquan Wang,Shan Su,Tao Yu,Chunfeng Meng,Hu Zhou,Wenjia Zhao,Shitan Yan,Ting Bian,Aihua Yuan
Rational design of metal/metal oxide hybrids embedded in heteroatom-doped carbon is a desired strategy to improve the kinetics of oxygen reduction (ORR)/evolution (OER) reactions. Herein, we present an elaborate method for preparing FeNi-based bimetallic alloy/oxide hybrids implanted in spongy-like N-doped carbon (S-FeNi/NiFe 2 O 4 @NC) via introducing FeNi Hofmann-type metal-organic frameworks (MOFs) as pyrolysis precursors. Impressively, the evenly distributed FeNi alloys coexisting with oxides are directly derived from bimetallic nodes in the MOFs, which are expected to boost the intrinsic electrocatalytic activity by multi-compositional synergism. Meanwhile, spongy-like N-doped carbon matrix would be effective for achieving rich metal active sites and rapid mass/electron transport. Accordingly, the obtained S-FeNi/NiFe 2 O 4 @NC-800 shows an extraordinary electrochemical activity with an ORR/OER potential gap of 0.76 V. In addition, the catalyst emerges outstanding stability with potential losses that are only half those of commercial reference catalysts for both ORR and OER after 10,000 cycles. Importantly, zinc-air battery assembled with S-FeNi/NiFe 2 O 4 @NC-800 delivers a high peak power density of 129 mW cm −2 and an excellent specific capacity of 837 mA h g −1 .
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2022
·Vol. 10
·期 10
·5305-5316
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IF 14.511
Yibo Tang,Ying Lei,Guijun Li,Tiantian Fu,Yang Xiang,Jingqi Sha,Hai Yang,Peng Yu,Yujun Si,Chaozhong Guo
In this work, a bifunctional oxygen catalyst containing both spinel structure sites and nitrogen doping sites was prepared based on a directional regulation strategy by adding Ni(OH)2 into a Fe3+–melamine precursor and then pyrolyzing the mixture. Melamine was pyrolyzed into N-doped carbon nanotubes, which afford oxygen reduction reaction (ORR) active sites, and meanwhile, the generated NiFe2O4 particles can act as active components for oxygen evolution reactions (OERs). The as-prepared catalyst named Fe–Me–Ni exhibits excellent bifunctional activities for ORRs with a half-wave potential of 0.841 V, and for OERs with an overpotential of 313 mV at 10 mA cm−2. The Zn–air battery fabricated from Fe–Me–Ni can work at a discharge voltage of 1.23–1.28 V with a specific capacity of 798 mA h gZn−1 at 10 mA cm−2, outperforming those of the Pt/C + RuO2 catalyst (1.17–1.24 V, 787 mA h gZn−1). The battery evaluation results also indicate the remarkable rechargeability and long-term cycling stability of the catalyst Fe–Me–Ni in practical applications.
研究领域:
材料科学
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电化学
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能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jinxiang Zuo,Binyuan Wang,Jing Kang,Pengwei Yan,Jimin Shen,Shuyu Wang,Donglei Fu,Xinwei Zhu,Tianhao She,Shengxin Zhao,Zhonglin Chen
Well-crystallized magnetic NiFe 2 O 4 nanoparticles were applied to activate peroxymonosulfate (PMS) for degrading 2,4-dichlorophenoxyacctic acid (2,4-D) in water. The performance of NiFe 2 O 4 synthesized with different metals (Ni and Fe) and citric acid ([Me n+ ] T /CA) molar ratio was investigated. The synthesized NiFe 2 O 4 with the molar ratio of [Me n+ ] T /CA of 1:1 showed the best performance to activate PMS, exerting a positive effect on 2,4-D degradation. The removal efficiency of 2,4-D reached 97.5 % in the NiFe 2 O 4 (1:1)/PMS system. Various water matrix factors, including solution pH, reaction temperature and inorganic ions were considered during the removal of 2,4-D. The quenching tests and ESR spectra displayed that the generation of reactive oxygen species (ROS) in the NiFe 2 O 4 (1:1)/PMS system, ·OH and SO 4 · - played the predominant role during 2,4-D degradation. The cycles of Fe 2+ /Fe 3+ and Ni 2+ /Ni 3+ on the surface of the catalysts prompted the decomposition of HSO 5 - for ·OH and SO 4 · - generation. The degradation mechanism of 2,4-D was declared by the density functional theory (DFT) calculations. The Cl and O in the structure of 2,4-D were rich in electrons, which were possible reaction sites for ROS. And the degradation mechanism of 2,4-D mainly includes decarboxylation, –OH substitution of Cl and H, and opening ring of benzene structure.
研究领域:
环境科学
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化学工程
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纳米技术
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水处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）