ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Mingjie Xu,Qiwen Tang,Zhengluo Wang,Hongxi Xiong,Yuhang Xie,Zelong Yu,Xiaohan Wang,Yonglin Chen,Weijiang Zhou,Shuihua Tang
Designing and preparing efficient and stable oxygen evolution reaction (OER) catalysts is crucial to improve water splitting performance. One-dimensional (1D) structural catalysts have received increasing attention for the OER due to their unique structural characteristics. In this study, 1D mesoporous NiFe 2 O 4 (NFO) spinel nanorods are fabricated by electrospinning, and the differences in physical structure and electrochemical performance of NFO nanorods prepared by different electrospinning precursors are investigated. It is found that the NFO nanorods prepared by precursor of nickel-iron hydroxide particles (denoted as NFO H) exhibit a diameter of approximately 200 nm and a surface area of 26.4 m 2 g −1 . In 1 M KOH solution, NFO H nanorods achieve low overpotentials of respective 316 mV and 396 mV to obtain current densities of 10 mA cm −2 and 50 mA cm −2 , as well as a low Tafel slope of 67.2 mV dec −1 , even lower than commercial NFO. Notably, the nanorods also demonstrate excellent long-term stability. The high OER activity can be attributed to the small nanoparticle size, abundant electrochemical active sites provided by the 1D mesoporous nanostructure, and increased conductivity, which promote charge/electron transfer and enhance the conversion of active species, thereby improving the efficiency of water electrolysis. This work may broaden the perspective and approach for the structural design of OER catalysts.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Yuxin Li,Zhe Zhang,Ziqi Zhang,Jinghan He,Minggang Xie,Chunguang Li,Haiyan Lu,Zhan Shi,Shouhua Feng
Water electrolysis represents a promising option for clean hydrogen production , but its overall efficiency is hindered by the sluggish oxygen evolution reaction (OER) with a complex electron transfer process. The construction of heterostructure has emerged as an effective approach to enhance the electrocatalytic performance for OER because of the improvement of exposed active surface and mass/charge transfer. In this work, we report the synthesis of hierarchical nanosheet-structured Ni 2 P-NiFe 2 O 4 as a robust OER catalyst via an annealing treatment and followed by in-situ phosphating process. The Ni 2 P-NiFe 2 O 4 electrocatalyst exhibits an overpotential of 305 mV to realize 100 mA cm −2 in 1.0 M KOH. Density functional theory calculations further confirm that the construction of heterostructure could optimize adsorption energy of oxygen-containing intermediates and reduce energy barrier during the OER process. This work may provide insights into the electrocatalytic activities of non-noble-metal-based catalysts and present an effective method for the preparation of complex structures.
研究领域:
材料科学
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电化学
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
·
IF 7.7
Xiangjian Liao,Xingyu Liu,Yilu Wu,Shufen Li,Guojiao Ren,Yuxiang Ou,Shiquan Chen,Zixuan Wu,Aiping Huang,Xianzhe Liu,Jianyi Luo
Acetone is a crucial biomarker of diabetes diagnosis by breath analysis. However, the fabrication of metal oxide semiconductor-based sensors with the desired gas-sensing abilities for sub-ppm acetone detection remains a significant challenge. In this study, heterostructured Ni x Fe 3-x O 4 composites with varying Ni concentrations were effectively developed using a simple one-step solvothermal process followed by post-calcination treatment. The sensor based on Ni x Fe 3-x O 4 composites exhibited excellent gas sensing performance toward 50 ppm acetone due to the formation of unique microstructures and numerous active sites. Notably, the optimum Ni 0.8 Fe 2.2 O 4 sensor demonstrated remarkable sensitivity even at sub-ppm levels, showing good monotonically increasing response (R 2 = 0.994) within the concentration range of 0.1–5.0 ppm acetone. Moreover, distinct signal responses between exhaled breath samples from a healthy individual and a simulated diabetic patient were observed in the Ni 0.8 Fe 2.2 O 4 sensor, implying that the Ni x Fe 3-x O 4 composites provided an alternative novel strategy for the effective detection of acetone in actual breath analysis of diabetes diagnosis.
研究领域:
材料科学
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医学
·
传感器技术
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高影响因子
Energy Material Advances
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2026
·
IF 17.4
Muwei Ji,Huixian Wei,Ketong He,Qing Liu,Feng Bao,Chenxi Wang,Hong Xia,Yibing Song,Liangsheng Hu,Fushen Lu
Hydrogen obtained via water electrolysis by using green power is clean energy for oursustainable development. However, the oxygen evolution reaction (OER) on the counter reactionremains a greater challenge due to the high overpotential and serious corrosion. Aiming to obtainelectrocatalysts with high activity and stability at high current densities, herein, Cr was introducedinto NiFeOx to form NiFe2-xCrxO4 on nickel foam (NF) through a straightforward synthetic approach.The NiFe2-xCrxO4 electrode performed high activity at 1.5 A cm-2 with an overpotential of 393 mVand stable operation for 200 hours at 1000 mA cm-2. The DFT simulations reveal the Cr-enhancedpolarization of oxygen species and the modulation of electron state enabling the electrocatalyst towithstand at a higher potential. The NiFe2-xCrxO4 ||Ni water electrolyzer operated stably over 2400hours at 1000 mA cm-2 and at higher current densities (2000-10000 mA cm-2) over 100 hours.Incorporating of Cr into NiFeOx enhances the electrochemical activity and long-term stability of theelectrodes, thereby providing valuable insights for the design and fabrication of high-performanceand durable anodes.Keywords: NiFexCr2-xO4, stability, Cr cation, oxygen evolution reaction, high current density.
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高影响因子
BIORESOURCE TECHNOLOGY
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2023
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IF 11.4
Shengyong Liu,Fuhua Shen,Faiqa Nadeem,Muneeb Ur Rahman,Muhammad Usman,Hina Ramzan,Muhammad Shahzaib,Reeta Rani Singhania,Wang Yi,Chunyao Qing,Nadeem Tahir
The triggering effects of nickel ferrite (NiFe 2 O 4 ) photo nanocatalysts on photo fermentative hydrogen production (PFHP), and metabolic pathways under various excitation sources (incandescent lamp, Xenon lamp, and 532 laser) have been investigated. Compare to the control group (CG) highest cumulative hydrogen volume (CHV) and the maximum hydrogen production rate (HPR) of 568.8 mL and 9.17 mL/h, respectively were achieved at a loading centration of 150 mg/L excited with an incandescent lamp. The change in metabolites with NiFe 2 O 4 incorporation suggests that bacterial activity is significantly affected by photo nanocatalysts. Triggering of NiFe 2 O 4 by laser excitation showed the highest HPR of 7.83 mL /h within 24 h, which greatly reduces the lag time. The microbial community investigation showed that the addition of NiFe 2 O 4 photo nanocatalysts and the change of light source effectively improved the microbial community structure and increased the abundance of hydrogen-producing bacteria (HPB) which leads to enhanced hydrogen production.
研究领域:
生物技术
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环境科学
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DOI
PubMed
高影响因子
Energy Technology
·
2019
·Vol. 7
·期 9
·1900374
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IF 3.163
Zhong Ma,Dewang Zeng,Shuai Zhang,Rui Xiao
NiFe 2 O 4 oxygen carrier (OC) presents higher oxygen carrying capacity than single metal oxides (NiO and Fe 2 O 3 ). However, the redox ability of NiFe 2 O 4 gets deactivated due to phase segregation. Herein, the investigation of the effect of supports (CeO 2 , CeZrO 2 , and ZrO 2 ) on the phase stability and the redox performance of NiFe 2 O 4 during the chemical looping (CL) process are presented. The structure of NiFe 2 O 4 -based OCs is characterized using different characterization methods. The CL reaction is conducted in a fixed-bed reactor at 900 °C under alternate 5% CO/N 2 and 5% O 2 /N 2 atmospheres. The results indicate that the redox performance and the phase stability of NiFe 2 O 4 -based OCs are significantly affected by the supports. According to experimental results, CeO 2 can improve the oxygen mobility of NiFe 2 O 4 . The CeO 2 –NiFe 2 O 4 OC has the best performance in terms of both recyclability and phase stability during the redox cycles. The results show that CeO 2 –NiFe 2 O 4 can reduce the tendency of Fe segregation due to the high concentration of oxygen vacancies. It can be reduced and reoxidized to the original crystalline phase of NiFe 2 O 4 . Nevertheless, the CeZrO 2 –NiFe 2 O 4 and ZrO 2 –NiFe 2 O 4 OCs have drawbacks related to serious sintering and phase segregation into Fe 2 O 3 .
研究领域:
材料科学
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化学工程
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能源化学
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催化化学
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无机化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Xiaoying Lu,Qian Yu,Xueqin Tao,Ting Wang,Kun Zhang,Benxia Li
Pd-based catalysts with high activity and recoverability are desirable for Suzuki coupling reactions which represent an important strategy for constructing carbon-carbon bonds in organic synthesis. Herein, a magnetic PdO x /NiFe 2 O 4 NFs catalyst consisting of PdO x nanoparticles (NPs) and NiFe 2 O 4 nanofibers (NFs) is synthesized by an electrospinning-calcination process. The microstructures and chemical compositions of PdO x /NiFe 2 O 4 NFs catalyst are well characterized. The optimized PdO x /NiFe 2 O 4 NFs exhibits high catalysis toward Suzuki coupling reactions under mild conditions, benefiting from the special electronic state of Pd δ+ (0 < δ < 2) active sites and the porous nanofiber structure of NiFe 2 O 4 support. The turnover frequencies (TOFs) for the reactions of iodo-, bromo- and chloro-benzene over the PdO x /NiFe 2 O 4 NFs catalyst reach up to 2064.79, 1366.74 and 215.28 h −1 , respectively, far exceeding those over the commercial Pd/C catalyst. The kinetic studies demonstrate that the PdO x /NiFe 2 O 4 NFs catalyst is more efficient to reduce the activation energy of Suzuki coupling reaction, which can be attributed to the superiority of Pd δ+ species in both charge-donating and charge-accepting steps of the reactions. Moreover, the PdO x /NiFe 2 O 4 NFs catalyst can be facilely separated and recycled in a long-term catalytic reaction owing to its distinct magnetic feature and good structural stability. This work affords a facile approach for the synthesis of heterogeneous catalyst with tunable compositions and porous structures as well as an attractive catalyst with superior catalytic activity, high stability and reusability.
研究领域:
化学
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材料科学
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有机合成
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2026
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IF 13.2
Ruizhi Li,Hui Liu,Cong Wang,Chenyao Wu,Jing Liu,Yile Zou,Yaning Zhang
This study investigates the enhancement of chemical looping hydrogen production (CLHP) performance in NiFe 2 O 4 oxygen carriers via B-site doping with small-radius metals (Al, Cr, Co, Ga). Experimental and density functional theory (DFT) results demonstrate that doping induces lattice contraction and increases FeO 6 octahedral distortion, thereby improving lattice oxygen mobility and reduction extent. Specifically, NiFe 1.8 Al 0.2 O 4 exhibited a 63.7% increase in H 2 yield compared to undoped NiFe 2 O 4 . Dopants with smaller ionic radii also raised oxygen vacancy formation energy, suppressing Ni reduction kinetics and promoting FeNi alloy formation, which enhanced cyclic stability. Optimal doping concentration was identified at x = 0.2. These findings provide valuable clues for designing high-performance oxygen carriers for efficient hydrogen.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Shengqiang Xue,Zhenhao Zong,Honglei Wang,Changping Yang
Oriented NiFe 2 O 4 on carbon paper under a vertical magnetic field. • Vertical orientation structure improves ion transport, boosting catalytic performance. • Oriented catalyst exhibits 238 mV overpotential at 10 mA cm⁻² and 100 h stability. • Vertical alignment enhances OH⁻ adsorption and intermediate conversion. Magnetic field assistance is a novel strategy that can enhance the catalytic performance of OER. However, the mechanism by which it regulates the catalytic reaction remains unclear. In this study, nickel-ferrite (NiFe 2 O 4 ) was prepared by the hydrothermal method, and external magnetic fields in different directions (parallel or perpendicular to the electrode surface) were applied during its curing process, thereby preparing catalytic materials with different orientations. In 1 M KOH, the vertically oriented catalyst (NFO/CP-Pe) exhibited an OER overpotential of 238 mV at a current density of 10 mA cm −2 , which was 59 mV lower than that of the non-oriented sample. Moreover, its Tafel slope decreased to 57.58 mV dec −1 , and the charge transfer resistance was significantly reduced to 1.24 Ω, indicating that this orientation optimized the ionic transport channels. Meanwhile, Chronopotentiometry confirmed that the catalyst maintained excellent stability even after more than 100 h of use. This result can be attributed to the preferential arrangement along the (311) and (400) crystal planes in the vertically oriented samples, which forms ordered ion transport channels, thereby enhancing the electrochemical kinetics performance of the electrode. The in-situ tests demonstrated that the vertically-oriented NiFe 2 O 4 catalyst significantly enhanced the oxygen evolution reaction (OER) catalytic activity by pre-adsorbing OH⁻ and optimizing the evolution pathways and surface adsorption behaviors of key intermediates such as NiOOH and OOH*. Magnetically aligned NiFe 2 O 4 electrodes combine enhanced OER activity with long-term stability, confirming the efficacy of magnetic-field-assisted electrode construction and providing a promising route for orientation-controlled catalyst design. Download: Download high-res image (173KB) Download: Download full-size image
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2025
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IF 3
Shuying Shi,Zitao Guo,Zetao Liu,Ailin Yang,Yongshuang You,Long jiang,Hao deng,Pengfei Gao
Magnetic fibers are ideal adsorbent material, the fibers have large aspect ratio, entangled with each other, do not agglomerate in water, magnetic materials can be magnetically separated, so magnetic fibers have the advantage of not agglomerating in water, easy to separate, more suitable for use as an adsorbent. The most commonly used methods for preparing NiFe 2 O 4 fibers were direct electrospinning and surface loading. Whether using NiFe 2 O 4 as a filler for direct electrospinning or loading it onto fibers, there are issues with limited NiFe 2 O 4 content and uneven loading. Compared to commonly used direct electrospinning and surface loading, we developed a simple sol–gel method to prepare the precursor spinning solution, then prepared the magnetic NiFe 2 O 4 fibers with excellent flexibility through electrospinning, and applied it to the adsorption of Pb (II) for the first time. The spinning solution was synthesized using iron sources, nickel sources and citric acid, the iron and nickel ions coordinated with carboxyl group according to the monodentate coordination. The flexible NiFe 2 O 4 fibers exhibited a saturation magnetization of 18.2 emu/g. Specific surface area of the flexible NiFe 2 O 4 fibers was 13.443 m 2 /g and total pore volume of the magnetic NiFe 2 O 4 fibers was 0.074 cm 3 /g. In the adsorption experiment, The NiFe 2 O 4 fibers demonstrated a maximum Pb(II) adsorption capacity of 49.53 mg/g. Due to the self-supporting and non-agglomeration advantages of the fiber structure in solution and the maximum adsorption capacity of the NiFe 2 O 4 fibers synthesized in this study for Pb(II) exceeded that of most previously reported NiFe 2 O 4 adsorbents. Flexible magnetic fibers provided a new solution for simultaneously improving the adsorption capacity of pollutant and achieving rapid magnetic separation, becoming another new material for expanding applications in the field of wastewater treatment.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·Vol. 49
·期 24
·10261-10267
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IF 2.5
Fangyuan Fan,Chunlin Teng,Rongjin Zhu,Lina Zhu,Lingfei Xu,Yeshuang Du
Electrochemical water-splitting is a potential “green” approach to produce a large amount of hydrogen. However, its half reaction, the oxygen evolution reaction (OER), suffers sluggish dynamics and huge overpotential. This encumbers the energy conversion efficiency from electric energy to hydrogen energy, resulting in cost increases. Besides, rare metal catalysts such as RuO2 and IrO2 have high OER catalytic activity but they are low in reserve and expensive. Hence, exploration of highly efficient, stable and cheap transition metal-based electrocatalysts to speed up the OER rate is a rational approach. Herein, S-doped NiFe2O4@NiSe2 nanospheres supported on nickel foam were synthesized through a simple one-pot hydrothermal method. Thanks to the unique structure, large surface area, numerous active sites, incorporation of S-anion atoms and synergistic effect between different components, S-doped NiFe2O4@NiSe2 nanospheres showed extraordinarily efficient electrocatalytic activity towards the OER in alkaline medium. When the current density was 10 mA cm−2, the OER overpotential was 190 mV. Meanwhile, it exhibited excellent long-term stability and was maintained at 10 mA cm−2 for ≥94 h in a chronopotentiometry test.
研究领域:
材料科学
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电化学
·
能源转换
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yijie Mao,Xiao Wang,Jianxiang Wu,Yulin Min,Qiaoxia Li,Qunjie Xu
The exfoliated black phosphorus nanosheets (EBP, phosphorene) is considered as a highly anticipated electrocatalyst for oxygen evolution reaction (OER) because of its unique electron structure. However, the poor stability and conductivity of EBP limit its application potential. In this paper, a heterostructure of EBP and nickel ferrite with oxygen vacancies (NFO-V-EBP) is designed by using a simple ultrasound and electronic regulation of EBP. NFO-V forms P-Ni bonds and P-O-M (M=Ni/Fe) bonds by interacting with the active lone pair electrons on the surface of EBP, which passivates EBP to improve its stability and provide more active sites. In situ Raman testing is used to assist in demonstrating the cooperative effect of EBP and oxygen vacancy, which reduced the potential barrier of OER reaction. NFO-V-EBP heterostructure exhibits excellent electrocatalytic performance for alkaline OER, showing overpotential of 243 mV at current density of 10 mA cm -2 and Tafel slope of 39 mV dec -1 . It also has excellent long-term stability, at a density of 10 mA cm -2 with no significant increase in overpotential observed after nearly 100 hours under the chronoamperometric method.
研究领域:
材料科学
·
电化学
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高影响因子
危险品化学品经营许可证（带存储）