ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Zhen Huang,Zhengbing Deng,Yuheng Feng,Tianju Chen,Dezhen Chen,Anqing Zheng,Guoqiang Wei,Fang He,Zengli Zhao,Jinhu Wu,Haibin Li
As a novel biomass gasification technology, chemical looping gasification (CLG) could in situ catalytically crack biomass tar by oxygen carrier (OC). This study compares the reactivity of different OCs (Al2O3, Fe2O3, NiO, NiO+Fe2O3, and NiFe2O4) to crack a biomass tar model compound (toluene) and preliminarily explores the reaction mechanisms of toluene cracked by NiFe2O4 OC. Among five OCs, NiFe2O4 with a homogeneous Fe/Ni dispersibility shows the best reactivity for toluene cracking with a toluene conversion and H2 yield of 96.83% and 0.91 L/g, respectively. Additionally, on the basis of the dispersibility of active sites on the OC sample surface, the reactivity of the other four OCs to crack toluene shows the sequence NiO+Fe2O3 > Fe2O3 > NiO ≫ Al2O3. A large amount of carbon deposition, including amorphous carbon and graphitized carbon, is generated during toluene catalytic cracking, while the addition of steam significantly eliminates the carbon deposition. The NiFe2O4 OC shows a dual-function of in situ oxidation–catalysis during toluene cracking. A mechanism of four steps is proposed for the toluene cracking on OCs: (I) toluene cracking at high temperature, (II) reduction of OC, (III) generation of amorphous carbon deposition and (III′) formation of graphitized carbon, and (IV) elimination of carbon deposition.
研究领域:
能源科学
·
催化化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Li Li,Kunchan Wang,Ting Lei
Exploring high-performance and cost-effective nonprecious metal-based electrocatalysts for overall water splitting is the key to sustainable renewable energy. Herein, petal-like NiFe 2 O 4 /Fe 2 O 3 heterostructure nanoarrays were constructed on iron foam (IF) surface by spontaneous galvanic displacement reaction and subsequent thermal oxidation. This in-situ grown integrated architecture is binder-free and useful for exposing accessible active sites, improving mass transfer and heightening the release of gases produced during water electrolysis. More importantly, the synergistic effect between NiFe 2 O 4 and Fe 2 O 3 effectively modulates the electronic structure of catalytic active sites, thereby promoting electrochemical kinetics. Accordingly, the optimal Ni-FeOx/IF 3 electrocatalyst exhibits remarkably enhanced catalytic activity in alkaline solution with only 230 and 82 mV to reach 10 mA cm −2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. The electrolyzer composed of Ni-FeOx/IF 3 as both the anode and cathode attain a current density of 10 mA cm −2 at a cell voltage of only 1.58 V for overall water splitting, with robust durability for 168 h in continuous water electrolysis, outperforming most reported NiFe-based catalysts. This work demonstrates a feasible and simple method to synthesize integrated electrodes with outstanding stability and high-performance for overall water splitting and provides an inspiration for future design of efficient bifunctional electrocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yiqun Chen,Mengyu Li,Yang Tong,Zizheng Liu,Liping Fang,Yi Wu,Zheng Fang,Feng Wu,Li-Zhi Huang
We report a process using NiFe 2 O 4 nanocatalyst for the heterogeneous activation of sulfite ions for estriol (E3) oxidation. This NiFe 2 O 4 -sulfite system consisted of NiFe 2 O 4 as an catalyst, sulfite as a reductant, O 2 as an oxidant, and oxysulfur radicals (SO 3 − , SO 4 − and SO 5 − ) and hydroxyl radicals (HO ) as generated radicals. The experimental conditions for E3 removal were investigated, including the initial pH values, dissolved oxygen concentration, and NiFe 2 O 4 and sulfite ion dosages. The initial pH has a significant influence on the catalytic performance, and approximately 87.6% of E3 could be removed at pH 9.0. NiFe 2 O 4 nanocatalyst was characterized by high resolution and field emission transmission electron microscopy, X-ray diffractometry, and X-ray photoelectron spectroscopy. The catalytic reactivity and stability of the NiFe 2 O 4 nanocatalyst were investigated by consecutive repeated runs. Radicals generated in this NiFe 2 O 4 -sulfite system were identified via radical-scavenging and electron spin resonance experiments. SO 5 − was identified as major oxidative radicals for E3 removal, which is quite different from the previous studies on sulfite activation . The generation of >SO 3 2− -Ni(II)-OH on NiFe 2 O 4 surface played a critical role in sulfite auto-oxidation. Our results supplemented the mechanism of the sulfate radical generation with sulfite ion as a source.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
·
2018
·Vol. 233
·期 3
·347-359
·
IF 1.144
Zuming He,Yongmei Xia,Bin Tang,Jiangbin Su,Xingfang Jiang
A series of magnetically recyclable NiFe 2 O 4 /ZnO nanocomposites have been successfully fabricated by a facile two-step route. The as-prepared NiFe 2 O 4 /ZnO nanocomposites were characterized by X-ray diffraction, field-emission scanning electron microscopy, vibrating sample magnetometer, ultraviolet-visible diffuse reflectance spectroscopy and photoluminescence spectroscopy. The results demonstrate that the NiFe 2 O 4 /ZnO nanocomposites are composed of ZnO particles (50–120 nm) integrated with NiFe 2 O 4 particles (30–80 nm) . Compared with bare ZnO, the NiFe 2 O 4 /ZnO nanocomposites exhibit evidently enhanced visible light absorption and decreased recombination of photo-generated electron-hole pairs. Moreover, the nanocomposites exhibit enhanced photocatalytic performance for the degradation of methylene blue under simulated solar light irradiation when compared with bare ZnO, and the 20%-NiFe 2 O 4 /ZnO nanocomposite is observed as the optimal composite. This is ascribed to the more efficient separation of photo-generated electron-hole pairs and generation of hydroxyl (˙OH) radicals in the 20%-NiFe 2 O 4 /ZnO nanocomposite. Furthermore, the NiFe 2 O 4 /ZnO nanocomposites have a high saturation magnetization, indicating that they can be magnetically separated and recycled from organic dye wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Ting Luo,Xianhua Hou,Qian Liang,Guangzu Zhang,Fuming Chen,Yingchun Xia,Qiang Ru,Lingmin Yao,Yuping Wu
In this work, it is successfully achieved to synthesize the three-dimensional flowerlike Ni (1-x) Mn x Fe 2 O 4 (x = 0, 0.02, 0.04, 0.06, 0.08, 0.1) by an environmental hydrothermal method . The morphology and structure of as-prepared Ni (1-x) Mn x Fe 2 O 4 are characterized via X-ray diffraction, scanning electronic microscopy and nitrogen adsorption-desorption isotherms, besides, the magnetic properties of the samples is revealed by vibrating sample magnetometer . The results show that the Ni (1-x) Mn x Fe 2 O 4 are cubic spinel phase with three-dimensional flowerlike microspheres structure assembled by nanosheets , which is exhibited the good performance to remove Congo red (CR). Besides, the samples with good magnetic properties facilitates magnetic separation for CR solution. The kinetics and isotherm of adsorption process are studied via a UV–visible spectrophotometer. The adsorption process is found to fit the pseudo-second-order kinetic model and Freundlich isotherm model better. Moreover, the adsorption capability of CR on Ni (1-x) Mn x Fe 2 O 4 has a great enhancement by the appropriate doping of Mn 2+ ions. In order to research the mechanism of the CR adsorption process, the effect of pH value and the surface group of the samples and CR are measured. Due to the doping of Mn 2+ ions, the surface activity of Ni (1-x) Mn x Fe 2 O 4 has been changed and the adsorption capability (231.74546 mg g −1 ) of CR on Ni 0.98 Mn 0.02 Fe 2 O 4 is maximum in the all samples at pH 5. This research suggests that appropriate doping of Mn 2+ ions could enhance the adsorption performance for CR, which provides a new idea for the development of adsorbent.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL SCIENCES
·
2024
·Vol. 40
·期 8
·1437-1448
·
IF 1.8
Feng Chengqi,Chen Zhiyuan,Yin Haoyong,Gong Jianying,Wang Hui,Wu Shengji,Wang Ling
Designing portable electrochemical sensors combined with highly efficient glucose oxidation electrodes offers a significant opportunity for convenient glucose detection. In this report, we present the design and preparation of platinum deposited Ni/NiFe 2 O 4 /Carbon composite (Pt/Ni/NiFe 2 O 4 /C) derived from Ni/Fe metal–organic frameworks (MOFs) followed by Pt deposition. Energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and electron microscopy (EM) were utilized to analyze the crystal structure, morphology, and chemical composition of the resulting materials. The glucose sensing capabilities of the optimal Pt/Ni/NiFe 2 O 4 /C-3 were assessed using amperometry methods on a smartphone-based portable device. Acting as a nonenzymatic glucose sensor, the Pt/Ni/NiFe 2 O 4 /C-3 electrode demonstrated notable sensitivity and a low limit of detection for glucose. The portable sensor exhibits high sensitivities of 131.88 μM mM cm −2 at low glucose concentration (3–500 μM) and 29.52 μA mM cm −2 at high glucose concentration (700–4000 μM), achieving a low detection limit of 1.1 μM (S/N = 3). The sensor also demonstrates enhanced selectivity and stability for detecting glucose. Furthermore, the portable sensor exhibits a clear step-ampere response in the detection of serum samples with satisfactory recovery ranging from 99.30 to 101.32%. This suggests the significant potential of portable glucose sensing applications. Graphical abstract
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 8
·4284-4294
·
IF 2.936
Yongmei Xia,Zuming He,Jiangbin Su,Bin Tang,Kejun Hu,Yaling Lu,Shunping Sun,Xiaoping Li
A series of novel flower-like NiFe2O4/BiOI (NFO/BOI) nanocomposites have been synthesized via a facile solvothermal method. The structure, morphology and magnetic, optical and visible-light photocatalytic properties of the as-prepared nanocomposite were respectively characterized by X-ray diffraction, field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence spectroscopy, vibrating sample magnetometry and UV-visible diffuse reflectance spectroscopy. Experimental results revealed that the weight percent of NiFe2O4 has a considerable effect on the photodegradation of rhodamine B, methylene blue and crystal violet under visible-light irradiation. Compared with pure NiFe2O4 and BiOI, all the heterogeneous NFO/BOI nanocomposites exhibited significantly enhanced photocatalytic efficiency. Among these prepared samples, the NiFe2O4/BiOI nanocomposite with 15% wt NiFe2O4 displayed the best photocatalytic activity. The enhanced photocatalytic performance was mainly ascribed to the efficient separation of photo-induced electron–hole pairs and the formation of highly active species, superoxide radicals (˙O2˙−), in the NFO/BOI photocatalytic oxidation system. Furthermore, the NFO/BOI nanocomposites could be easily separated and recycled from contaminant solution using a magnet, which exhibited great potential application in the treatment of various pollutants in wastewater by utilizing solar energy effectively.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 10
·1181
·
IF 4.501
Da Song,Yan Lin,Kun Zhao,Zhen Huang,Fang He,Ya Xiong
CO2resourceful utilization contributes to the goal of carbon neutrality. Chemical Looping Dry Reforming (CLDR) has attracted significant attention as a method for converting CO2to CO. NiFe2O4oxygen carrier (OC) is found to be a potential material for CLDR. However, the migration process of lattice oxygen, which are critical for the conversion of CO2to CO, was not extensively investigated. In this study, the reduction and oxidation degrees of the NiFe2O4were finely modulated in a thermogravimetric analyzer. The lattice oxygen migration mechanism of the NiFe2O4in redox cycles was characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and in-situ Raman. The novelty of this paper is clarifying the release-uptake paths of lattice oxygen during CO2resourceful utilization. The result indicates that the concentration gradient between the surface and the bulk drives the diffusion of lattice oxygen. The stabilization of surface lattice oxygen content is attributed to the rapid migration of O anion, which is closely associated with the movement process of Ni particles inward and outward through the spinel bulk. In addition, a highly reactive chemical reaction interface consisting of lattice oxygen and the corresponding metal atoms is always present on the surface of the oxygen carrier and is confirmed by an in-situ Raman and XPS during the whole process of CLDR. The results of this paper offer reference and basis for further development and design of CLDR using spinel OC.Keywords:chemical looping (CL);oxygen carrier (OC);CO2splitting;lattice oxygen;NiFe2O4
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Chen Cheng,Dandan Li,Tao Zhao,Dong Wang,Dazhong Zhong,Genyan Hao,Guang Liu,Jinping Li,Qiang Zhao
A NiFe alloy was designed on nickel foam (NF) as a precursor using cathodic electrodeposition . NiFe 2 O 4 –Ni 3 S 2 nanorods (NRs) composite catalysts were prepared by Fe 3+ impregnation and further hydrothermal sulfuration methods. NiFe 2 O 4 –Ni 3 S 2 nanosheets (NSs) were also prepared by direct hydrothermal sulfuration of the NiFe alloy for comparison. Compared to the dense NS structure of the NiFe 2 O 4 –Ni 3 S 2 NSs/NF, the NiFe 2 O 4 –Ni 3 S 2 NRs/NF showed better oxygen evolution performance due to its unique weed-like NR array structure composed of additional oxygen evolution reaction (OER) active sites, with a strong electron interaction for Ni and Fe and the active sulfide synergistic effect with oxides . Therefore, Driving a current density of 10 mA cm −2 only requires an overpotential of 189 mV and the catalyst could provide 100 mA cm −2 continuously and be constant for more than 80 h in 1.0 M KOH. This experiment indicated that Fe 3+ immersion had an indirect regulating effect on the morphological growth of the catalyst, which provided a novel concept for designing better OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Gao-yu Zhao,Lun-jiang Liu,Jun-rong Li,Qin Liu
Novel NiFe 2 O 4 /Ag 3 PO 4 composites were prepared by a simple ion-exchange deposition method. The samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) and UV–visible diffuse reflectance spectroscopy (UV–vis DRS). It is worth to note that these NiFe 2 O 4 /Ag 3 PO 4 composites could act as both adsorbents and photocatalysts for the removal of methylene blue (MB). The as-prepared 5%-NiFe 2 O 4 /Ag 3 PO 4 composite exhibited much higher adsorptive and photocatalytic activity than the pure Ag 3 PO 4 . Through the combined action of adsorption and photodegradation, MB could be removed more efficiently. The photocatalytic mechanism of NiFe 2 O 4 /Ag 3 PO 4 composites is also proposed.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jie Zhu,Qian Zhang,Peng Zhao,Lin Chen,Sudong Yang,Qiang Yan,Hongmei Li
Exploring robust and high-performance bifunctional electrocatalysts for overall water splitting is crucial for converting electric power to hydrogen energy, especially for the flexible utilization of intermittent green energy resources. Herein, pine-needle-like NiFe 2 O 4 @Co 3 O 4 heterostructure nanoarrays with abundant oxygen vacancies were deposited onto nickel foam via hydrothermal reaction , cathodic electrodeposition , and CaH 2 reduction. The synergistic approach boosts the electrochemical activity of catalyst by improving conductivity, mass diffusion efficiency, and active site quantity. Accordingly, the optimal electrocatalyst exhibits outstanding catalytic activity with high electrochemical stability in an alkaline medium, providing low overpotentials of 251 mV and 77 mV respectively to achieve 10 mA·cm −2 for catalyzing OER and HER . Moreover, the as-fabricated bifunctional electrocatalyst only requires a cell voltage of 1.56 V to enable a current density of 10 mA·cm −2 for realizing water electrolysis, outperforming many other previously reported catalysts. This work provides an inspiration for developing open structure materials with synergistic effect, and demonstrates a feasible method to synthesis high-efficiency electrocatalysts for water splitting.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yufei Feng,Shaobo Ye,Chenchen Yue,Wenhao Liu,Xuyang Lu,Qiao Liu,Qiliang Wei,Zhisheng Wu,Weiyou Yang,Qing Shi
The construction of NiFe-based composites on foam metal is an advanced strategy to design high-performance catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, we chose Fe foam (FF) as the substrate, which was first modified by anodic electrodeposition to form a porous and loose FeS x / FeO x layer. This modified layer facilitates the construction of nanoflower-structured NiFeS 2 /NiFe 2 O 4 composites with large electrochemical active surface area, higher Ni content and enhanced ratio of Ni 3 + to Ni 2+ , compared with the sample fabricated by direct etching FF. The prepared NiFeS 2 /NiFe 2 O 4 /FF electrode only requires overpotentials of 242 and 273 mV to achieve current densities of 100 and 500 mA cm⁻ 2 for OER, respectively. It also possesses faster reaction kinetics with a low Tafel slope of 31.12 mV dec −1 and superior durability without potential reduction for 200 h at a large current density of 500 mA cm⁻ 2 . Meanwhile, the performance of overall water splitting cell assembled with NiFeS 2 /NiFe 2 O 4 /FF is better than that of cell based on the noble metal Pt/C/FF- |RuO 2 /FF. This work provides a simple and cost-effective strategy for constructing efficient electrocatalysts, making it promising for large-scale industrial applications in alkaline water electrolysis.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）