COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
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IF 2.714
Yang Li,Ke Hu,Bo Chen,Yijun Liang,Fengguo Fan,Jianfei Sun,Yu Zhang,Ning Gu
Field-assisted synthesis has been one of the common strategies of nanoparticles preparation with enhanced properties. However, most researches focused on exploring the effects of monofunctional static field on the structure and properties of synthetic nanomaterials, few researchers have applied fields with period variation as assistance. Combining medium alternating current magnetic field with most widely used method traditional chemical co-precipitation held potential in preparation high quality Fe 3 O 4 nanoparticle. In this study, Fe 3 O 4 nanoparticle clusters were prepared in alternating-current magnetic field (ACMF) by co-precipitation principle, structural and magnetic properties were also characterized. Results demonstrated that Fe 3 O 4 nanoparticle clusters prepared by co-precipitation heated in ACMF indicated a better heat production under ACMF, comparing with Fe 3 O 4 nanoparticle clusters with similar size and distribution prepared by classic co-precipitation. It might be due to the magnetic effects induced by ACMF that Fe 3 O 4 nanoparticles tend to grow along the magnetization direction. This technology might hold promise in preparation high performance magnetic nanomaterial in the future.
研究领域:
材料科学
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纳米技术
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
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2016
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IF 2.437
Bo Chen,Yang Li,Xiquan Zhang,Fei Liu,Yanlong Liu,Min ji,Fei Xiong,Ning Gu
Ferumoxytol (Feraheme™), as one kind of magnetic nanoparticles (MNPs), was approved for clinical application in USA and widely used as magnetic resonance imaging (MRI) agent in tumor and inflammation for preclinical diagnosis research. In this study, we explored a novel synthesis of ferumoxytol induced by alternating-current magnetic field (ACMF). As-prepared ferumoxytol was characterized by transmission electron microscopy (TEM), particle size analyzer, fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and heating measurement in ACMF. Relative characterizations proved that as-synthesized ferumoxytol demonstrated better quality than Feraheme™ that was prepared by ordinary chemical co-precipitation on particle size distribution , crystallinity and magnetism . Above all, this ACMF induced synthesis may offer a better strategy for ferumoxytol preparation.
研究领域:
材料科学
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纳米技术
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医学成像
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Hang-bo Zheng,Yuan-li Wang,Pei Zhang,Feng Ma,Peng-zhao Gao,Wen-ming Guo,Hang Qin,Xiao-pan Liu,Han-ning Xiao
The slow kinetics of Oxygen evolution reaction (OER) restricts the large-scale application of water electrolysis technology . It is reported that magnetic field can improve OER activity, but it is not clear how the AC magnetic field affects OER. Here, a series of NiCoFe-MOF-74 are reported, and it is found AC magnetic field can significantly enhance the alkaline OER activity at low current densities, but reduce the alkaline OER activity at high current densities, due to spin conservation, MHD effect, and induced electric field induced by AC magnetic field. In particular, when an AC magnetic field of 5.184 mT is applied, the overpotential at 10 mA cm −2 of NiCoFe-MOF-74 and carbon paper was reduced by 36.7% and 17.6%, respectively, but the overpotential at 40 mA cm −2 increased by 27.8% and 39.9%, respectively. This discovery provides a promising strategy for introducing an AC magnetic field to adjust the process of electrocatalytic reactions.
研究领域:
电化学
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材料科学
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催化反应
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Hang-bo Zheng,Shuai-qi Jing,Yuan-li Wang,Peng-zhao Gao,Hang Qin,Dong-yun Li,Wen-ming Guo,Xiao-pan Liu,Han-ning Xiao
Reducing the overpotential of oxygen evolution reaction (OER) with slow kinetics is important to realize commercial hydrogen production from water electrolysis . Here, ZnCo 2 O 4 with abundant surface oxygen vacancies is employed to clarify the influence of oxygen vacancies on OER performance under AC magnetic field. The additional active sites as well as enhanced reaction activity of each active sites resulting from oxygen vacancies enable N–ZnCo 2 O 4-δ -350 to exhibit outstanding OER performance, where the overpotential is 406 mV at 10 mA cm −2 . Furthermore, double exchange interaction between Co 2+ -O 2- -Co 3+ ignited by oxygen vacancies produces ferromagnetism in N–ZnCo 2 O 4-δ , which can directly promote OER under ACMF. And the mass transport at additional active sites active sites provided by oxygen vacancies is also accelerated under ACMF due to magnetohydrodynamic convection. As a result, non-iR-corrected overpotential at 10 mA cm −2 of N–ZnCo 2 O 4-δ -350 is reduced to 243 mV when the ACMF intensity is 4.752 mT, which is a 44.5% reduction compared to no ACMF. These findings provide a novel and efficient perspective for realizing efficient electrocatalysis .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Hang-bo Zheng,Yuan-li Wang,Jia-wei Xie,Peng-zhao Gao,Dong-yun Li,Evgeny V Rebrov,Hang Qin,Xiao-pan Liu,Han-ning Xiao
Renewable electricity from splitting water to produce hydrogen is a favorable technology to achieve carbon neutrality, but slow anodic oxygen evolution reaction (OER) kinetics limits its large-scale commercialization. Electron spin polarization and increasing the reaction temperature are considered as potential ways to promote alkaline OER. Here, it is reported that in the alkaline OER process under an AC magnetic field, a ferromagnetic ordered electrocatalyst can simultaneously act as a heater and a spin polarizer to achieve significant OER enhancement at a low current density. Moreover, its effect obviously precedes antiferromagnetic, ferrimagnetic, and diamagnetic electrocatalysts. In particular, the noncorrected overpotential of the ferromagnetic electrocatalyst Co at 10 mA cm–2 is reduced by a maximum of 36.6% to 243 mV at 4.320 mT. It is found that the magnetic heating effect is immediate, and more importantly, it is localized and hardly affects the temperature of the entire electrolytic cell. In addition, the spin pinning effect established on the ferromagnetic/paramagnetic interface generated during the reconstruction of the ferromagnetic electrocatalyst expands the ferromagnetic order of the paramagnetic layer. Also, the introduction of an external magnetic field further increases the orderly arrangement of spins, thereby promoting OER. This work provides a reference for the design of high-performance OER electrocatalysts under a magnetic field.
研究领域:
能源材料科学
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电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Tong-hui Yang,Song Yue,Wei-wei Gong,Ren-qing Wang,Wei-da Hu,Xiao-pan Liu,Peng-zhao Gao,Hang Qin,Wen-ming Guo,Han-ning Xiao
Electrochemical nitrogen reduction reaction(eNRR) is a promising strategy for ammonia production because of its mild reaction conditions, high theoretical conversion rate, and green pollution. However, the strong stability of N N triple bond and competitive hydrogen evolution reaction (HER) limit the Faraday efficiency and ammonia conversion of eNRR. In recent years, the structural design of catalysts combined with external field enhancement to enhance the AC magnetic field electrocatalytic reaction has received extensive attention. In this study, an eNRR catalyst ( x Fe-M-TiO 2 ) with a high concentration of oxygen vacancies was constructed by the defect engineering strategy. The ammonia conversion rate of eNRR of 1.5Fe-M-TiO 2 was 7.35 μg h −1 mg cat −1 , and the Faraday efficiency was 22.69 %, which was 2 % higher than that before doping. The spin–orbit coupling effect induced by the AC magnetic field further improved the eNRR activity, in which the Faraday efficiency increased to 52.14 % (increased by 150 %), and the ammonia yield increased to 13.37 μg h −1 mg cat −1 (increased by 5 %). After 80 h of eNRR, the current density of the catalyst became 95 % of the initial current density, and the stability was good. Density functional theory calculation showed that Fe doping did not change the reaction mechanism of eNRR but increased the concentration of oxygen vacancy, resulting in a 0.62 eV decrease in the energy barrier of the first hydrogenation of eNRR, which was conducive to the occurrence of eNRR.
研究领域:
材料科学
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电化学
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催化
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纳米技术
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）