4.7 Article

Reagent-and solvent-mediated Fe2O3 morphologies and electrochemical mechanism of Fe2O3 ???????supercapacitors

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 919, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.165702

关键词

Microstructures; Oxidation/reduction; Hematite Fe2O3; Supercapacitor

资金

  1. Research Network NANOTEC [035/2565]
  2. National Nanotechnology Center (NANOTEC)
  3. NSTDA
  4. Ministry of Higher Education, Science, Research and Innovation
  5. Khon Kaen University, Thailand
  6. Fundamental Fund of Khon Kaen University, Thailand
  7. Srinakharinwirot University, Thailand [035/2565]
  8. Thailand Center of Excellence in Physics (ThEP) , Thailand
  9. NSRF via the Program Management Unit for Human Resource & Institutional Development, Research and Innovation [035/2565]
  10. Development and Promotion of Science and Technology Talents Project (DPST) , Thailand
  11. [B05F640110]

向作者/读者索取更多资源

A solvothermal technique was used to synthesize nine different morphologies of ferric oxide. Among them, the flower-shaped ferric oxide exhibited the highest specific capacitance, pore volume, and specific surface area. The flower-shaped ferric oxide film maintained a relatively high performance after 1000 cycles. Supercapacitor coin cells constructed from the flower-shaped ferric oxide anode and MnO2 cathode showed excellent energy density and power density.
A solvothermal technique was used to synthesize nine different ferric oxide (Fe2O3) morphologies: rhomb (R), flower (F), hollow sphere (HS), crystal (C), elongated hexagon (EH), hexagon (H), sugar apple (SA), sand/spherical particle (SSP) and mixed particle (MP). X-ray diffraction, high-resolution transmission electron microscopy and selected area electron diffraction reveal six of the nine powders to be composed of the pure alpha-Fe2O3 structure, whereas the EH-Fe2O3, H-Fe2O3 and SA-Fe2O3 powders contain the mixed alpha-Fe2O3/Fe3O4 structure. The F-Fe2O3 powder has the highest total specific pore volume (0.059 cm(3) g(-1)), the largest average pore size (23.983 nm), and a high specific surface area (9.82 m(2) g(-1)), which subsequently produce the highest specific capacitance of 218.49 F g(-1). X-ray photoemission spectroscopy and energy dispersive spectroscopy detect H2O and K+ adsorption on the F-Fe2O3 electrode and the reduction of Fe3+ to Fe2+ in the charged state, whereas H2O molecules and K+ ions are released from the F-Fe2O3 electrode, and Fe2+ is oxidized to Fe3+ in the discharged state. The simulated K-inserted-alpha-Fe2O3 structure shows an increased electron density surrounding Fe atoms, which is indicative of Fe3+ reduction during the charged state. The F-Fe2O3 film is able to retain 76.81 % of its 20(th) cycle value after 1,000 cycles. Four series-supercapacitor coin cells constructed from the F-Fe2O3 anode and the MnO2 cathode deliver an outstanding energy density of 10.96 Wh kg(-1) and power density of 0.461 kW kg(-1). (C) 2022 Elsevier B.V. All rights reserved.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据