Morphology-controlled synthesis and novel microwave electromagnetic properties of hollow urchin-like chain Fe-doped MnO2 under 10T high magnetic field

Duan, Yuping; Jia, Zhang; Jing, Hui; Liu, Shunhua

doi:10.1016/j.jssc.2011.03.007

Cited by 18 publications

(5 citation statements)

References 18 publications

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“…The addition of Fe caused the MnO 2 crystallinity to decrease by causing defects or disorder in the MnO 2 lattice. In addition, the doping of high‐valent cations (Fe 3+ ) was able to prevent the growth of crystalline of MnO 2 , which corresponded to the results of previous studies [64–68] …”

Section: Resultssupporting

confidence: 87%

“…[62][63] For the FeMn x O y _I catalysts prepared by the impregnation method, as shown in Figure 2 In addition, the doping of high-valent cations (Fe 3 + ) was able to prevent the growth of crystalline of MnO 2 , which corresponded to the results of previous studies. [64][65][66][67][68] For the FeMn x O y _H prepared by the solvothermal method, Mn was presented in the mixed phases of cubic temperature could increase the mean crystallite size of Fe 2 O 3 and the solvothermal time would affect the presence of ordered iron oxide phases. [69][70] In this study, the preparation of CuMn x O y _H and FeMn x O y _H can be explained in 3 steps.…”

Section: Chemelectrochemmentioning

confidence: 99%

See 1 more Smart Citation

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

et al. 2022

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Improving manganese oxides as cathodic catalysts in direct methanol/hydrogen peroxide fuel cells by incorporation of Cu and Fe to promote oxygen reduction (OR) and hydrogen peroxide reduction (HPR) is reported. The Cu‐incorporated and Fe‐incorporated MnxOy were prepared by impregnation and solvothermal processes. From XRD, XPS, and XAS analyses, the obtained MnxOy consisted of MnO2 and mixed phases of Mn3O4 and Mn2O3 from impregnation and solvothermal methods, respectively. The Cu‐incorporated and Fe‐incorporated MnxOy included CuO and Fe2O3, respectively, through both methods. Addition of Cu and Fe decreased the BET surface area and increased the pore sizes as compared to the pristine MnO2. With the Fe : Mn molar ratio of 0.20 : 1, the Fe‐incorporated MnxOy from the solvothermal method presented the highest cathodic peaks under the cyclic voltammogram of HPR and OR at around 0.59 V of 11.59 mA cm−2 and −0.59 V of −12.33 mA cm−2, respectively. Compared to the Cu‐incorporated ones, the highest HPR peak at 0.68 V of 9.20 mA cm−2 and the highest OR peak at −0.59 V of −6.99 mA cm−2 were obtained from the Cu‐incorporated MnxOy prepared through the solvothermal method at the Cu : Mn molar ratio of 0.15 : 1. Incorporating Cu or Fe into MnO2 brought the improvement of electrocatalytic activity for HPR and OR. The Cu‐incorporated and Fe‐incorporated MnxOy from both methods showed a higher power density of μ‐DMFC than the pristine MnO2.

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Section: Resultssupporting

confidence: 87%

Section: Chemelectrochemmentioning

confidence: 99%

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

et al. 2022

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“…Microwave absorption materials (MAMs) can absorb electromagnetic wave energy projected onto the surface and transform it to heat and/or other types of energy . Many physicists have made great efforts to develop a new generation of microwave absorbing materials with broad absorption band, low density, and well-coupled dielectric and magnetic losses. − In this respect, SiC, one of representative dielectric materials, may be of particular significance as a promising microwave absorbing material . Pure SiC, however, hardly possesses the ability to absorb microwave.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetism and Microwave Electromagnetism of Iron-Doped Titanium Nitride Nanocrystals

et al. 2012

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Titanium nitride (TiN) nanocrystals doped with different dosages of iron were prepared by calcinating nanotubular titanic acid precursor in flowing ammonia. The structure of as-prepared Fe-doped TiN nanocrystals was characterized, and their ferromagnetism and microwave electromagnetism were investigated. It has been found that as-prepared Fe-doped TiN nanocrystals exhibit distinct room temperature ferromagnetic properties and improved microwave electromagnetic loss behavior when compared with the undoped counterpart. Considering the crystal structure and chemical feature of as-synthesized products, we suppose that structural defects are responsible for the observed ferromagnetism and microwave electromagnetism of as-synthesized Fe-doped TiN, and it may be feasible to tune the magnetic and electromagnetic properties by manipulating the generation of the structural defects. Hopefully, the present research is to shed light on Fe-doped TiN nanocrystal as a promising microwave absorption material and to help acquiring insights into the origin of ferromagnetism and microwave electromagnetism in a broad range of nanostructures, thereby broadening the scope of dilute magnetic and electromagnetic wave absorbing materials.

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“…In this process, the surface of FCNT was supposedly acting as the nucleation site leading to the limited aggregation of MnO 2 nanocrystallites. During the synthesis, as the aggregation proceeds, it leads to the formation of nanorods which coalesce to form nanoflowers [ 40 , 41 , 42 ]. In this work, conc.…”

Section: Resultsmentioning

confidence: 99%

Functionalized Carbon Nanotube and MnO2 Nanoflower Hybrid as an Electrode Material for Supercapacitor Application

et al. 2021

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Functionalized carbon nanotube (FCNT) and Manganese Oxide (MnO2) nanoflower hybrid material was synthesized using hydrothermal technique as a promising electrode material for supercapacitor applications. The morphological investigation revealed the formation of ‘nanoflower’ like structure of MnO2 connected with FCNT, thus paving an easy path for the conduction of electrons during the electrochemical mechanism. A significant improvement in capacitance properties was observed in the hybrid material, in which carbon nanotube acts as a conducting cylindrical path, while the major role of MnO2 was to store the charge, acting as an electrolyte reservoir leading to an overall improved electrochemical performance. The full cell electrochemical analysis of FCNT-MnO2 hybrid using 3 M potassium hydroxide (KOH) electrolyte indicated a specific capacitance of 359.53 F g−1, specific energy of 49.93 Wh kg−1 and maximum specific power of 898.84 W kg−1 at 5 mV s−1. The results show promise for the future of supercapacitor development based on hybrid electrode materials, where high specific energy can be achieved along with high specific power and long cycle life.

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Morphology-controlled synthesis and novel microwave electromagnetic properties of hollow urchin-like chain Fe-doped MnO2 under 10T high magnetic field

Cited by 18 publications

References 18 publications

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

Ferromagnetism and Microwave Electromagnetism of Iron-Doped Titanium Nitride Nanocrystals

Functionalized Carbon Nanotube and MnO2 Nanoflower Hybrid as an Electrode Material for Supercapacitor Application

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Morphology-controlled synthesis and novel microwave electromagnetic properties of hollow urchin-like chain Fe-doped MnO2 under 10T high magnetic field

Cited by 18 publications

References 18 publications

Cu‐ and Fe‐Incorporated Manganese Oxides (MnxOy) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

Cu‐ and Fe‐Incorporated Manganese Oxides (MnxOy) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

Ferromagnetism and Microwave Electromagnetism of Iron-Doped Titanium Nitride Nanocrystals

Functionalized Carbon Nanotube and MnO2 Nanoflower Hybrid as an Electrode Material for Supercapacitor Application

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Product

Resources

About

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells