Journal of Materials Chemistry A
·
2025
·
IF 9.5
Gao-Ren Li,Hongrui Zhu,Guixiang Ding,Huimin Xu,Chen-Jin Huang,Vyacheslav Fominski
The regulation of catalyst surface structure in catalytic process is the basis of regulating catalytic performance. For spinel materials, the common active phases on their surfaces in the oxygen evolution reaction (OER) are metal hydroxyl oxides, so promoting its surface reconstruction to form the metal hydroxyl oxide to improve the catalytic activity is one of the commonly used modification methods. In this work, amorphous P-doped NiFe2O4 (A-P-NFO) was successfully prepared by hydrothermal method and phosphating treatment. The amorphous structure can lead to a strong polarization effect in A-P-NFO, where electrons are attracted from the antibonding orbitals to the empty orbitals, thus lowering the average valence state of nickel and activating the Ni-O bond. Unlike other reported work on NFO, this work demonstrates that the lower Ni and Fe valence states are more favorable for catalytic activity. In addition, the amorphous structure keeps A-P-NFO in a metastable state, which will be conducive to the leaching of surface cations, accelerating the surface reconstruction of A-P-NFO during the OER process, and thus playing a key role in the improvement of the catalytic performance of OER. The synchrotron radiation, in-situ Raman spectra and DFT calculations demonstrate that the A-P-NFO is conducive to electron transfer and adsorption of electroactive species (OH*, O*, etc.) for OER. TheA-P-NFOexhibits the excellent OER catalytic performance under alkaline electrolyte conditions, achieving a low overpotential of 240 mV at 10 mA cm-2 and maintaining high catalytic stability over 48 h. Furthermore, its OER catalytic performance is superior to the recently reported catalysts of the similar type. The method of turning the catalyst into metastable state structure through P doping and amorphization strategy is expected to provide new research ideas and application prospects for improving the catalytic performance of similar catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bowen Lu,Ziqiang Han,Xinyu Zhi,Liqi Zhang
NiFe 2 O 4 exhibits excellent redox properties and is widely applied in catalytic reactions. However, rapid inactivation under reaction conditions limited its industrial applications. In this study, CeO 2 -NiFe 2 O 4 composite catalysts were synthesized, and the Reverse Water Gas Shift (RWGS) reaction was measured to reveal its CO 2 hydrogenation performance under a high-temperature condition. NiFe 2 O 4 catalysts got deactivated after being reduced to Fe-Ni alloy at 700 °C, decreasing the CO 2 conversion rate. CeO 2 addition can significantly improve its high-temperature activity, and 20CeO 2 -NiFe 2 O 4 exhibited the best catalytic activity (80.85 %, 700 °C). The CeO 2 -confined maintained Ni-Fe alloy with a relatively small crystal size and larger specific surface area, supporting more active sites for CO 2 hydrogenation. CeO 2 addition induced higher oxygen vacancy concentration, enhancing CO 2 activation and formates species formed on 20CeO 2 -NiFe 2 O 4 , resulting in higher CO 2 conversion activity. In addition, 20CeO 2 -NiFe 2 O 4 maintained its catalytic stability for 50 h at 700 °C. The CeO 2 confined enhanced the high-temperature stability of Fe-Ni alloy. CeO 2 and formed CeFeO 3 dispersed in 20CeO 2 -NiFe 2 O 4 inhibited excessive aggregation of Fe-Ni alloy, and CeO 2 inhibited carbon deposition on Fe-Ni alloy, improving Fe-Ni alloy’s reaction stability under RWGS reaction conditions. CeO 2 confined may give insight into improving metal stability under high-temperature and reductive conditions in heterogeneous catalysis.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Weiwei Zhu,Dekui Shen
The development of high-performance anode materials is of great importance for improving the electrochemical performance of asymmetric supercapacitors . Here, nickel ferrite/porous carbon composite is synthesized via hydrothermal approach and the electrochemical properties are improved by nitrogen doping process. As the surface nitrogen content of the porous carbon precursor increased from 2.40 at.% to 9.53 at.%, the nickel ferrite/porous carbon composite exhibited substantial improvement in specific capacitance (increased from 136.4 to 201.4 F g −1 at 1 A g −1 ) in an alkaline aqueous electrolyte. The energy density of the assembled asymmetric supercapacitor was increased from 17.7 W h kg −1 to 11.2 W h kg −1 , and the cycle retention rate after 10,000 cycles at 2 A g −1 was increased from 16.5 % to 85.7 %. Nitrogen atoms on the carbon surface provide active sites for the growth of nickel ferrite nanoparticles and enhance the interfacial effect between nickel ferrite nanoparticles and porous carbon materials, enhancing the charge transfer and preventing particle aggregation during charge and discharge processes. The fabricated nickel ferrite/nitrogen-doped porous carbon composite exhibits excellent capacitance and cycling stability, providing a new option for asymmetric supercapacitor anode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Duo Zhang,Ying-Nan Dou,Rui Gao,Xian-Fa Zhang,Hui Zhao,Xiao-Li Cheng,Shan Gao,Ying-Ming Xu,Li-Hua Huo
Rapid, highly sensitive detection of mustard gas is a critical requirement in public safety and national defense. However, achieving highly sensitive, ppb-level detection of mustard gas under low-power conditions remains a significant challenge. Focusing on the typical blister agent simulant 2-chloroethyl ethyl sulfide (2-CEES), a solvothermal method was employed combined with controlled thermal treatment to fabricate an ultrathin porous NiFe 2 O 4 /NiO nanosheets heterostructure sensor derived from an Fe-Ni-MOF in-situ grown on a ceramic tube in this study. This material possesses uniformly distributed intimate heterogeneous interface, a high specific surface area (95.8 m 2 ·g −1 ), and abundant surface active sites, thereby significantly enhancing its adsorption and catalytic oxidation capability toward 2-CEES. At a low operating temperature of 130 °C, the sensor demonstrates a high response of 41.5 toward 10 ppm 2-CEES, a rapid recovery capability of only 84 s, and a low detection limit of 20 ppb, along with excellent selectivity, humidity resistance, reproducibility, and long-term stability. Through systematic characterization including XPS, in-situ DRIFTS, TPD, and DFT calculations, the multi-step catalytic oxidation pathway of 2-CEES on the composite surface is elucidated, along with the mechanism by which the heterostructure enhances gas-sensing performance via band structure modulation, interfacial charge transfer, and the built-in electric field. This study offers both new materials and novel insights for the development of low-power, highly sensitive sensors for trace detection of chemical warfare agents.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Zhiyong Han,Zhenyuan Liu,Linfeng Chen,Yuxiu Shi,Haoyang Chen,Jiale He,Qicheng Liu,Yawen Tang
Developing cost-efficient, eco-friendly and high-performance electrocatalysts for oxygen evolution reaction (OER) is important to practical implementation of energy technologies like water electrolysis and rechargeable metal−air batteries. Spinel-type complex oxides exhibit significant potential as electrocatalysts for OER, attributed to their natural abundance, structural diversity, compositional flexibility, and exceptional stability. Therefore, we develop a Hofmann-type CP-derived approach to synthesize porous NiFe 2 O 4 nanosheets (NSs) involving the precipitation of precursors and thermal decomposition under precise temperature. The fabricated NiFe 2 O 4 NSs have well-preserved the original sheet-like morphology, and have also created plentiful pores and oxygen vacancies. Electrochemical results indicate that the obtained NiFe 2 O 4 NSs exhibit superior electrocatalytic performance with smaller overpotential of 320 mV at 10 mA cm −2 , Tafel slope of 51.5 mV dec −1 , and remarkable long-term stability in alkaline electrolytes compared to commercial RuO 2 . The present synthetic strategy provides a feasible pathway for preparing other diverse metal oxides with well-defined porous nanostructures for energy applications.
✓ 已验证
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2019
·Vol. 45
·期 3
·463-471
·
IF 1.634
Ming Zhang,Fengqi Zhao,Yanjing Yang,Ting An,Wengang Qu,Hui Li,Jiankan Zhang,Na Li
Three kinds of ferrates (NiFe 2 O 4 , ZnFe 2 O 4 and CoFe 2 O 4 ) were prepared via the facile solvothermal method and characterized using SEM, TEM, XRD, XPS, FT-IR and BET instruments. The NiFe 2 O 4 , CoFe 2 O 4 and ZnFe 2 O 4 particles possess hollow structure with average particle size of 70, 220 and 360 nm, respectively. The catalytic performance of the ferrates for AP thermal decomposition were studied using DSC and TG-DTG methods, and the decomposition mechanism of AP were suggested. The catalytic effects of different ferrates for AP thermal decomposition were significantly different. The CoFe 2 O 4 has the best catalytic activity, and the high thermal decomposition peak temperature ( T HDP ) and apparent activation energy ( E a ) of AP were decreased by 108.99 °C and 37.38 kJ mol −1 in the presence of CoFe 2 O 4 sample. Adding ferrates has no obvious influence on the gas-phase decomposition products of AP, but has a great influence on the energy barrier of high temperature decomposition of AP. The excellent catalytic activity of CoFe 2 O 4 is mainly attributed to the synergistic interaction between Fe and Co, which is conducive to the thermal decomposition of AP.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Da Wen,Zhongwen You,Kaixun Tian,Zhen Wang
A treatment method for wastewater containing nickel citrate complexes was first proposed, which conformed to the strategy of “treating waste with waste”. Nickel was recovered from wastewater containing nickel citrate complexes using ferrate (VI) and the recovered product was converted to the magnetic nanocatalyst iron-nickel spinel NiFe 2 O 4 (NFO) via calcination . Subsequently, NFO was used to activate peroxymonosulfate (PMS) to degrade the nickel citrate complexes in wastewater. The morphology and crystallinity of NFO are controlled by changing the calcination temperature of the precursor, which in turn affects the catalytic properties and magnetic properties of NFO. The characterization results show that the increase of the calcination temperature can positively affect the crystallization and magnetic properties of NFO. The morphology of NFO-900 after calcination at 900 °C was octahedral nanoparticles with a maximum saturation magnetization intensity of 47.43 emu·g −1 . This implies that it can be easily magnetically recovered from the wastewater. Experiments on the degradation of nickel citrate complexes by the NFO/PMS system showed that NFO-900 had the best potential to activate PMS. Electron spin resonance and quenching experiments confirmed that the main reactive oxygen species of the system were SO 4 •- , 1 O 2 , • O 2 - , and • OH. NFO-900 also exhibited good reusability and catalytic performance after five consecutive cycles. This study provides a green and promising technology for the treatment of wastewater containing nickel citrate complexes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Shixu Li,Hui Zhao,Pengpeng Bai,Yonggang Meng,Yu Tian
Magnetorheological fluid (MRF), a smart suspension that respond to external magnetic fields, exhibits potential in engineering fields but is limited by its low mechanical properties and insufficient wear resistance. In this study, a magnetic biochar composite material (NiFe 2 O 4 /biochar) was proposed to ameliorate the magneto-induced yield stress and tribologcial characteristic of MRF. The cooperativity between magnetism of nanoscale particle and lubrication of biochar helps to enhance the suspension stability, dynamic yield stress, and friction characteristics of MRF. A series of tests for MRF were used to verify the effectiveness of magnetic composite materials. Experimental results showed that the addition of 3 % NiFe 2 O 4 /biochar to the MRF significantly improved the dynamic yield stress by 26.13 % under a magnetic flux density of 400 mT. Furthermore, the composite material improved the anti-settling stability of the MRF, reducing the height of the supernatant by 31.64 % after 12 h. Tribological tests revealed that the composite material also enhanced wear resistance, as evidenced by a reduction in both the friction coefficient (from 0.251 to 0.241) and the wear scar diameter at a 3 % mass fraction. These findings suggest that NiFe 2 O 4 /biochar composite materials are an effective strategy for improving the performance of MRF, making it more suitable for diverse engineering applications, particularly in environments requiring enhanced stability and wear resistance.
研究领域:
材料科学
·
机械工程
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xianke Zhang,Li Li,Yuqiang Zeng,Jujun Yuan,Yi Yu,Xiurong Zhu,Zuzhou Xiong,Huajun Yu,Yingmao Xie
In this study, we report a facile in situ synthesis of hierarchical NiO/NiFe 2 O 4 sub-microcubes by annealing Ni 3 [Fe(CN) 6 ] 2 sub-microcubes fabricated via a one-step solution-precipitation method. The temperature-dependent magnetization curves show that there exists a collective freezing of the moments of interface spin clusters at T B ≈ 296 K , which further indicates the appearance a coupling interaction between the ferrimagnetic NiFe 2 O 4 and antiferromagnetic NiO nanoparticles . Furthermore, hysteresis loops measurements reveal the existence of an exchange bias effect in the NiO/NiFe 2 O 4 composite system . Interestingly, no training effect of exchange bias is observed, which indicates that the magnetic pinning interaction between NiFe 2 O 4 and NiO is stable and robust. Exchange bias field shows an exponential dependence on temperature and vanishes at about 150 K, which reveals the strong coupling interaction does not improve effectively the thermal stability of exchange bias effect in the current system.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yanshuai Yuan,Lei Wang,Qiangchao Sun,Wei Nie,Linhui Chang,Shuangqiang Chen,Hongwei Cheng
Nickel-rich layered oxides are considered one of the most promising cathode materials for efficient lithium-ion batteries due to their high energy density and reasonable cost. However, at high cut-off voltage, the interfacial instability and structural degradation lead to severe capacity attenuation and poor thermal stability, which greatly hinder their large-scale applications. Herein, a multifunctional antispinel NiFe 2 O 4 coated LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM@NFO) material is in-situ induced by co-precipitation and subsequent sintering, boosting the cycling stability of Ni-rich materials. Coupling in-depth characterizations ( in-situ X-ray diffraction, etc.) with density functional theory calculations, the versatility of the NFO coating has been revealed. Including suppressing the transition metal dissolution, preventing the unwanted phase transition, inhibiting the oxygen vacancy generation, and stabilizing the crystal structure of the NCM by forming an M-O-N bonding network. More importantly, attributing to the high ion/electron conductivity of the NFO layer, the Li + transport kinetics between NCM@NFO particles have been facilitated. Benefitting from the collaborative effect of the protective NFO coating, the optimized 2 wt% NFO@NCM (NCM@NFO-2) sample achieves higher capacity retention (81.25 vs 67.88% after 200 cycles) at high voltages (2.75 ∼ 4.5 [email protected] ) and more excellent rate capabilities (109.86 vs 49.52 mAh·g −1 at 10C), as well as impressive capacity retention of 81.72% after 100 cycles (at 60 °C@1C). Constructing a versatile bimetallic oxide protective layer at the secondary particle surface of layered oxides provides an effective strategy for Ni-rich cathodes towards high-energy, long-duration, and safe lithium ion batteries.
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Xueqian Yan,Jin Qian,Xiangjun Pei,Lihong Zhou,Rui Ma,Mingkuan Zhang,Yufei Du,Linqin Bai
In this study, a magnetic NiFe 2 O 4 /MWCNTs/BiOI composite were fabricated and applied for enhanced and sustainable photocatalytic degradation of doxycycline (DOX) under UV light irradiation. The as-synthesized material was characterized by a series of techniques and its photocatalytic property was assessed via a couple of batch tests. With the pH at 3.0 and NiFe 2 O 4 /MWCNTs/BiOI loading of 1.5 g L −1 , the DOX degradation (at 45 mg L −1 ) efficiency could achieve 92.18% with the reaction rate constant k of 0.0072 min −1 . The high mineralization of DOX suggests the strong oxidation of both the parent pollutant and the intermediary products in the ternary catalyst system. DRS spectra indicated that compared with BiOI , the introduction of NiFe 2 O 4 and MWCNTs reduces the band gap energy of the NiFe 2 O 4 /MWCNTs/BiOI. The quenching test illustrates that h + , OH and O 2 − all functioned in the developed photocatalytic system, where O 2 − and h + play the dominant roles in DOX degradation. The more efficient electron-h + separation and more oxidizing species induced by UV light resulted in the significant improvement of DOX abatement in the developed coupling system compared with that on either BiOI or NiFe 2 O 4 /MWCNTs. The magnetic property of NiFe 2 O 4 /MWCNTs/BiOI enables its easy separation of the solid catalyst from the reaction solution and the sustainable application in the photocatalysis . Based on the intermediates of DOX decomposition identified by UPLC-MS, the possible degradation routes were proposed accordingly.
研究领域:
环境化学
·
材料科学
·
光催化
·
水污染治理
·
纳米复合材料
·
药物降解
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 14
·1088
·
IF 4.3
Xianfeng Hao,Yuehang Sun,Zongwei Liu,Gongao Jiao,Dongzhi Zhang
Ammonia (NH3) is one of the characteristic gases used to detect food spoilage. In this study, the 10 wt% Ag-NiFe2O4nanocomposite was synthesized via the hydrothermal method. Characterization results from SEM, XRD, and XPS analyzed the microstructure, elemental composition, and crystal lattice features of the composite, confirming its successful fabrication. Under the optimal working temperature of 280 °C, the composite exhibited excellent gas-sensing properties towards NH3. The 10 wt% Ag-NiFe2O4sensor demonstrates rapid response and recovery, as well as high sensitivity, towards 30 ppm NH3, with response and recovery times of merely 3 s and 9 s, respectively, and a response value of 4.59. The detection limit is as low as 0.1 ppm, meeting the standards for food safety detection. Additionally, the sensor exhibits good short-term repeatability and long-term stability. Additionally, density functional theory (DFT) simulations were conducted to investigate the gas-sensing advantages of the Ag-NiFe2O4composite by analyzing the electron density and density of states, thereby providing theoretical guidance for experimental testing. This study facilitates the rapid detection of food spoilage and promotes the development of portable food safety detection devices.
研究领域:
材料科学
·
传感器技术
·
食品安全
·
纳米技术
·
理论化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）