International Journal of Minerals Metallurgy and Materials
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2022
·Vol. 29
·期 5
·1120-1131
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IF 3.85
Yan Wenjing,Zhang Jintao,Lü Aijing,Lu Songle,Zhong Yiwei,Wang Mingyong
Stable non-noble metal bifunctional electrocatalysts are one of the challenges to the fluctuating overall water splitting driven by renewable energy. Herein, a novel self-supporting hierarchically porous Ni x Fe—S/NiFe 2 O 4 heterostructure as bifunctional electrocatalyst was constructed based on porous Ni—Fe electrodeposition on three-dimensional (3D) carbon fiber cloth, in situ oxidation, and chemical sulfuration. Results showed that the Ni x Fe—S/NiFe 2 O 4 heterostructure with a large specific surface area exhibits good bifunctional activity and stability for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) because of the abundance of active sites, synergistic effect of the heterostructure, superhydrophilic surface, and stable, self-supporting structure. The results further confirmed that the Ni x Fe—S phase in the heterostructure is transformed into metal oxides/hydroxides and Ni 3 S 2 during OER. Compared with the commercial 20wt% Pt/C∥IrO 2 —Ta 2 O 5 electrolyzer, the self-supporting Ni 1/5 Fe—S/NiFe 2 O 4 ∥Ni 1/2 Fe—S/NiFe 2 O 4 electrolyzer exhibits better stability and lower cell voltage in the fluctuating current density range of 10–500 mA/cm 2 . Particularly, the cell voltage of Ni 1/5 Fe—S/NiFe 2 O 4 ∥Ni 1/2 Fe—S/NiFe 2 O 4 is only approximately 3.91 V at an industrial current density of 500 mA/cm 2 , which is lower than that of the 20wt% Pt/C∥IrO 2 —Ta 2 O 5 electrolyzer (i.e., approximately 4.79 V). This work provides a promising strategy to develop excellent bifunctional electrocatalysts for fluctuating overall water splitting.
研究领域:
材料科学
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电化学
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可再生能源
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催化
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Jinxiang Zuo,Donglei Fu,Pengwei Yan,Shuyu Wang,Yabin Li,Linlu Shen,Yizhen Cheng,Jimin Shen,Jing Kang,Zhonglin Chen
In this study, Al-doped NiFe 2 O 4 (NiAl x Fe 2-x O 4 ) was synthesized by the isomorphic substitution strategy, which was further employed for peroxymonosulfate (PMS) activation to remove 2,4-dichlorophenoxyacetic acid (2,4-D) in water. Doping of Al could construct oxygen vacancies (OVs) in the structure of NiAl x Fe 2-x O 4 , which further facilitates the exposure of metal sites for PMS activation. The removal rate of 2,4-D increased greatly compared to the NiFe 2 O 4 -activated process. By the density functional theory (DFT) process, it was verified that Al was more likely to replace Fe rather than Ni. OVs sites have the lowest adsorption energy of H 2 O ( E ads = -0.95 eV), and easily formed surface hydroxyl groups (–OH), which were further replaced by PMS (HSO 5 - ). The formed surface complex Me-O-O-SO 3 - was readily activated via electron transfer between O-O bond, thus promoting the cleavage of it and inducing SO 4 · - generation. This process induced the high performance of the NiAl x Fe 2-x O 4 /PMS system for effective 2,4-D degradation. Furthermore, the purified water showed relatively low toxicity. The present study proposed new insights into the interface mechanism of PMS triggering.
研究领域:
环境科学
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化学工程
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材料科学
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水处理
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jiachen Zou,Guanying Song,Anguo Cui,Jinfeng Cui,Zhenjiang Li
The rational design of highly active electrocatalysts for water electrolysis remains challenging for green hydrogen utilization . Herein, guided by the correlation between the electroactivity and the d-band center (E d ), a novel hierarchical nanoarchitecture (Ni 2 P/NiFe 2 O 4 -V O @N-GTs) was fabricated, in which, Ni 2 P nanoparticles are grown on the oxygen vacancy-rich NiFe 2 O 4 nanosheet arrays anchoring on N-doping graphene tubes. The results reveal that the multiple strategies including the vacancies and heterogeneous interface construction effectively induce the charge redistribution, and further adjust the E d to the appropriate energy level, which endows the optimal balance between the adsorption and desorption ability of the catalyst to reaction intermediates, thus leading to the conspicuous electrocatalytic activity . Additionally, the hierarchical nanoarchitecture contributes to the exposure of more active sites, the efficiency of electron transfer , and the release of generated gas. Hence, Ni 2 P/NiFe 2 O 4 -V O @N-GTs presents superior bifunctional activity, especially a low overpotential of 194 mV at 10 mA cm −2 for OER . The corresponding overall water electrolyzer owns a lower cell voltage and long-term durability with continuously operating over 330 h at 100 mA cm −2 , outperforming the most reported bifunctional electrocatalysts . This work presents an effective pathway for regulating the E d through multiple strategies to improve the catalytic performance of catalysts.
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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可再生能源
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Katam Srinivas,Yuanfu Chen,Bin Wang,Bo Yu,Yingjiong Lu,Zhe Su,Wanli Zhang,Dongxu Yang
Strategic design and fabrication of a highly efficient and cost-effective bifunctional electrocatalyst is of great significance in water electrolysis in order to produce sustainable hydrogen fuel in a large scale. However, it is still challenging to develop a stable, inexpensive, and efficient bifunctional electrocatalyst that can overcome the sluggish oxygen evolution kinetics in water electrolysis. To address the aforementioned concerns, a metal–organic framework-derived Fe-doped Ni3Fe/NiFe2O4 heterostructural nanoparticle-embedded carbon nanotube (CNT) matrix (Fe(0.2)/Ni-M@C-400-2h) is synthesized via a facile hydrothermal reaction and subsequent carbonization of an earth-abundant Ni/Fe/C precursor. With a novel porous nanoarchitecture fabricated by a Ni3Fe/NiFe2O4 heterostructure on a highly conductive CNT matrix, this catalyst exhibits exceptional bifunctional activity during water electrolysis over the Ni/Fe-based electrocatalysts reported recently. It delivers a low overpotential of 250 mV to achieve a current density of 10 mA/cm2 with a small Tafel slope of 43.4 mV/dec for oxygen evolution reaction. It requires a low overpotential of 128 mV (η10) for hydrogen evolution reaction and displays a low overpotential of 1.62 V (η10) for overall water splitting. This study introduces a facile and straightforward synthesis strategy to develop transition metal-based nanoarchitectures with high performance and durability for overall water-splitting catalysis.
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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能源材料
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催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2025
·
IF 17.7
Hong-Rui Zhu,Xi-Lun Wang,Juan-Juan Zhao,Meng-Han Yin,Hui-Min Xu,Gao-Ren Li
Plastics are ubiquitous in human life and pose certain hazards to the environment and human body. The increasing amount of CO 2 in the atmosphere will lead to the greenhouse effect. Therefore, it is urgent to treat microplastic waste and CO 2 by using environmentally friendly and efficient technologies. In this work, we developed an efficient photoelectrocatalytic system composed of Ni single atoms (Ni SAs) supported by P, N-doped amorphous NiFe 2 O 4 (Ni SAs/A-P-N-NFO) as anode and Ag nanoparticles (Ag NPs) supported by CuO/Cu 2 O nanocubes (Ag NPs@CuO/Cu 2 O NCs) as cathode for microplastic oxidation and CO 2 reduction. The Ni SAs/A-P-N-NFO was synthesized by calcination-H 2 reduction method, and it achieved a Faraday efficiency of 93% for the oxidation reaction of poly (ethylene terephthalate) (PET) solution under AM 1.5 G light. As a photocathode, the synthesized Ag NPs@CuO/Cu 2 O NCs was utilized to reduce CO 2 to ethylene and CO at 1.5 V vs . RHE with selectivity of 42% and 55%, respectively. This work shows that the photoelectrocatalysis, as an environmentally friendly technology, is a feasible strategy for reducing the environmental and biological hazards of light plastics, as well as for efficient CO 2 reduction.
研究领域:
环境科学
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材料科学
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电化学
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纳米技术
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催化
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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
Yaqi Yang,Pu Wang,Zhiwang Luo,Jiejun Li,Yilin Wang,Zhen Li,Chao Chen,Yixi Xie,Pengcheng Zhao,Junjie Fei
Two-dimensional (2D) porous carbon nanosheets loaded with bimetallic oxide nanospheres are expected to be very attractive electrocatalysts. In this work, we constructed ordered mesoporous nitrogen-rich carbon on the surface of ultrathin-reduced graphene oxide (rGO) using the self-assembly of block polymers and compared the effect of pore structure on the sensing performance. The rGO wrapped by N-doped ordered porous carbon possesses a large specific surface area of 784.9 m 2 /g. The composite with NiFe 2 O 4 nanospheres with rough surfaces effectively prevented the interlayer accumulation of mNPC@rGO. Meanwhile, the multivalent form of metal elements in NiFe 2 O 4 facilitates the redox reaction. These distinct advantages combine to create an active surface that strongly binds to chlorogenic acid molecules (CGA). Importantly, we have computationally analyzed the reaction mechanism of mNPC@rGO/NiFe 2 O 4 electrocatalytic CGA molecules by density functional theory. In the best case, the mNPC@rGO/NiFe 2 O 4 /GCE sensor has a limit of detection (LOD) as low as 2 × 10 −11 M and a wide linear range (1 × 10 −10 −2 × 10 −5 M). The sensor displays a remarkable level of selective response to CGA in the presence of other co-interfering species. Furthermore, it has superb repeatability and reproducibility for CGA. The sensor has shown outstanding recovery (95.9%−104.9%) in the practical viability of detecting CGA in food, natural products, and biological samples. This work not only provides a new candidate for the accurate detection of CGA, but also provides insight into the exploration of advanced sensing materials.
研究领域:
材料科学
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电化学
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分析化学
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纳米技术
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2026
·
IF 9.1
Jiaojiao Xie,Xinyu Zhi,Bowen Lu,Dikun Hong,Liqi Zhang
NiFe 2 O 4 has been widely applied in CO 2 hydrogenation for its excellent redox properties. However, NiFe 2 O 4 samples usually exhibited complex performance, rapid inactivation followed by slow activation, and poor hydrogenation selectivity. In this work, the complex behavior of NiFe 2 O 4 in CO 2 hydrogenation was studied, and the influence of surface oxide species(NiO and Fe 2 O 3 ) on its catalytic performance was probed on NiFe 2 O 4 -ww through magnetic water washing. NiFe 2 O 4 -ww was observed to predominantly produce CO with nearly 100% selectivity at lower temperatures and demonstrated a higher CO 2 conversion rate of 71.90% at 700 °C. However, under high-temperature reducing conditions, NiFe 2 O 4 -ww underwent rapid reduction to form Fe Ni alloy, which induced sintering and carbon deposition, thereby leading to a significant decline in catalytic activity. Surface NiO species on NiFe 2 O 4 enhanced CO 2 hydrogenation at lower temperatures but reduced the selectivity towards CO. Surface Fe 2 O 3 species enhanced the catalytic resistance to reduction, thereby improving catalyst stability by inhibiting the accumulation of carbon deposition. The effect of residual oxides on the NiFe 2 O 4 surface may give insight into understanding the deactivation behavior of Fe Ni alloy in CO 2 hydrogenation.
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产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
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2023
·Vol. 30
·期 3
·548-558
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IF 4.8
Li Qiuying,Lu Yiheng,Shao Zhuoyan
A new type of composite filler was designed by a modified sol—gel method using fly ash (FA), Fe(NO 3 ) 3 ·9H 2 O, and Ni(NO 3 ) 2 ·6H 2 O as raw materials. The composite filler was a spherical core-shell structure composed of FA as the core and NiFe 2 O 4 as the shell. Further, the composite filler was added into the silicone rubber to fabricate the high temperature vulcanized microwave absorption materials; X-ray diffraction, fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscope confirmed that NiFe 2 O 4 was successfully coated on the surface of FA and formed a uniform and continuous coating layer. As expected, silicone rubber filled with the composite filler had a minimum reflection loss of −23.8 dB at 17.5 GHz with the thickness of 1.8 mm, while the effective absorption bandwidth was as high as 12 GHz. The addition of the composite filler greatly enhanced the microwave absorption properties of the system, which was resulted from multiple losses mechanism: interface polarization losses, magnetic losses, and multiple reflection losses. Also, silicone rubber filled with the composite filler exhibited excellent thermal stability, flexibility, environmental resistance, and hydrophobicity compared with traditional silicone rubber. Therefore, this work not only responds to the green chemistry to achieve efficient FA recovery, but also devises a new strategy to prepare microwave absorption materials with strong potential for civilian applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
·
IF 6.2
Yinfeng Xu,Houbin Guo,Hao Shi,Hua Dong
This study successfully synthesized a highly dispersible magnetic nanocatalyst (NiFe 2 O 4 @SA) based on stearic acid modification for efficient catalytic upgrading of heavy oil. Through comprehensive characterization methods including SEM, EDS, XRD, XPS, FTIR, TGA, contact angle measurements, dispersion tests, and VSM, the structure, surface properties, thermal stability, dispersion, and strong magnetic properties of the catalyst were investigated. When applied to heavy oil upgrading, this catalyst significantly reduced the viscosity of heavy oil and upgraded heavy oil. The effects of four different upgrading strategies on heavy oil viscosity reduction were evaluated: (1) direct aquathermolysis, (2) aquathermolysis with tetralin as a hydrogen donor, (3) aquathermolysis with only the NiFe 2 O 4 @SA catalyst (without adding hydrogen donor), and (4) aquathermolysis with NiFe 2 O 4 @SA as catalyst and tetralin as hydrogen donor. Comprehensive analyses of the heavy oil before and after upgrading were conducted using viscosity measurement, SARA fractionation, elemental analysis, GC-MS, ¹H NMR, and FT-IR. The results showed that program 4# significantly reduced the viscosity of heavy oil (by 76.6 %) and greatly improved its quality. More importantly, the NiFe 2 O 4 @SA catalyst demonstrated excellent reusability: after multiple cycles of use, heavy oil upgrading efficiency (viscosity reduction) remained stable; elemental analysis results of the upgraded oil after five cycles further confirmed the sustainability of its performance. Crucially, TGA analysis, contact angle measurements after prolonged high-temperature treatment, and VSM testing of the catalyst after recycling indicated that its thermal stability, surface properties, and magnetic property were well preserved, highlighting its outstanding durability. This study provides a new strategy for developing efficient, stable, and recyclable heavy oil upgrading catalysts.
研究领域:
催化化学
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石油化学
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材料科学
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能源工程
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纳米技术
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
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2019
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IF 2.87
Xingliang Chen,Kailiang Zhong,Tao Shi,Xinlei Meng,Guanglei Wu,Yun Lu
Uniform urchin-like polyaniline/magnetic carbon sphere (PANI/p-C/NiFe 2 O 4 ) hybrid with superior electromagnetic wave absorption properties was successfully fabricated, and its morphologies and structures were investigated via SEM, XPS, XRD and FT-IR. Due to the fairly good matching of dielectric loss and magnetic loss, the PANI/p-C/NiFe 2 O 4 hybrid sample with thickness of 2.5 mm showed a minimum reflection loss value up to −37 dB in the frequency range of 2–18 GHz, the effective absorption band width of 3.9 GHz, and the excellent electromagnetic wave absorption property both in absorption efficiency and effective absorption band.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2023
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IF 5.7
Mengbi Zhang,Yun Zhang,Hong Zhong,Liqing Li,Zhanfang Cao
Background Water electrolysis is one of the most competitive approaches to generate hydrogen. The economical stainless steel, which consists of transition metals such as Ni and Fe, has impressive catalytic tunability and tremendous application potential in hydrogen production . Methods In this work, a hydrothermal activation strategy is proposed for breaking the inert oxide layer of stainless steel and producing an active catalytic layer dominated by NiFe 2 O 4 spinel nanoparticles on the surface. The molybdate further complexes with the metal ions, disrupting the initial regular crystals of NiFe 2 O 4 and exposing more defects. At the same time, Mo atoms can further optimize the electronic structure, which is conducive to the kinetic process of the reaction. Significant Findings Consequently, the modified stainless steel requires only 270 mV to achieve a current density of 10 mA·cm −2 , much lower than 387 mV of bare 304 stainless steel (SS304). Moreover, the robust catalytic layer, evolved from the stainless steel's own elements, grows firmly on the surface and shows excellent stability in the test of 120 h. This work provides a novel strategy for developing low-cost stainless steel electrodes with superior performance and stability for oxygen evolution.
研究领域:
材料科学
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电化学
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能源转化
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2026
·
IF 3
Huang Nan,Luo Yuehui,Zhu Can,Tang Wanyun,Tao Shiju,Yang Huan,Liu Xin,Li Quanxin
Developing green and efficient methods to acquire lignocellulose-based chemicals with high added value is beneficial for facilitating green chemistry and sustainable development. The goal of this study is to demonstrate that bio-based cresol, a noteworthy high-value chemical, is able to be directionally prepared from lignocellulosic biomass. This new controllable transformation was materialized by uniting catalytic pyrolysis of lignocellulose to toluene intermediate and catalytic hydroxylation of toluene intermediate to bio-based cresol. This work also developed a novel highly active magnetic catalyst [NiFe 2 O 4 @Biochar(HTR)], which was synthesized via hydrothermal-reduction (HTR) method using ethylene glycol reductant. The NiFe 2 O 4 @Biochar(HTR) catalyst exhibited high cresol selectivity (80.2%) and high cresol yield (50.7%) in the synthesis process of cresol. It was found that introducing biochar support into Ni-Fe composite metal oxide catalyst enhanced hydroxyl radical formation and bio-based cresol synthesis. Based on catalyst characterizations and hydroxyl radical analysis, presumable reaction mechanism for bio-based cresol synthesis was proposed.
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DOI
高影响因子
危险品化学品经营许可证（带存储）