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Title: Energy-driven surface evolution in beta-MnO 2 structures

Abstract

Exposed crystal facets directly affect the electrochemical/catalytic performance of MnO 2 materials during their applications in supercapacitors, rechargeable batteries, and fuel cells. Currently, the facet-controlled synthesis of MnO 2 is facing serious challenges due to the lack of an in-depth understanding of their surface evolution mechanisms. Here, combining aberration-corrected scanning transmission electron microscopy (STEM) and high-resolution TEM, we revealed a mutual energy-driven mechanism between beta-MnO 2 nanowires and microstructures that dominated the evolution of the lateral facets in both structures. The evolution of the lateral surfaces followed the elimination of the {100} facets and increased the occupancy of {110} facets with the increase in hydrothermal retention time. Both self-growth and oriented attachment along their {100} facets were observed as two different ways to reduce the surface energies of the beta-MnO 2 structures. High-density screw dislocations with the 1/2 < 100 > Burgers vector were generated consequently. As a result, the observed surface evolution phenomenon offers guidance for the facet-controlled growth of beta-MnO 2 materials with high performances for its application in metal-air batteries, fuel cells, supercapacitors, etc.

Authors:
 [1];  [2];  [1];  [3];  [1];  [1];  [4];  [4];  [5]
  1. Michigan Technological Univ., Houghton, MI (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); The Univ. of Illinois at Chicago, Chicago, IL (United States)
  3. The Univ. of Illinois at Chicago, Chicago, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Michigan Technological Univ., Houghton, MI (United States); The Univ. of Illinois at Chicago, Chicago, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); National Science Foundation (NSF)
OSTI Identifier:
1436104
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nano Research
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 1998-0124
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; facet evolution; growth mechanism; manganese oxide; oriented attachment; surface energy

Citation Formats

Yao, Wentao, Yuan, Yifei, Asayesh-Ardakani, Hasti, Huang, Zhennan, Long, Fei, Friedrich, Craig R., Amine, Khalil, Lu, Jun, and Shahbazian-Yassar, Reza. Energy-driven surface evolution in beta-MnO2 structures. United States: N. p., 2017. Web. doi:10.1007/s12274-017-1620-5.
Yao, Wentao, Yuan, Yifei, Asayesh-Ardakani, Hasti, Huang, Zhennan, Long, Fei, Friedrich, Craig R., Amine, Khalil, Lu, Jun, & Shahbazian-Yassar, Reza. Energy-driven surface evolution in beta-MnO2 structures. United States. doi:10.1007/s12274-017-1620-5.
Yao, Wentao, Yuan, Yifei, Asayesh-Ardakani, Hasti, Huang, Zhennan, Long, Fei, Friedrich, Craig R., Amine, Khalil, Lu, Jun, and Shahbazian-Yassar, Reza. Thu . "Energy-driven surface evolution in beta-MnO2 structures". United States. doi:10.1007/s12274-017-1620-5. https://www.osti.gov/servlets/purl/1436104.
@article{osti_1436104,
title = {Energy-driven surface evolution in beta-MnO2 structures},
author = {Yao, Wentao and Yuan, Yifei and Asayesh-Ardakani, Hasti and Huang, Zhennan and Long, Fei and Friedrich, Craig R. and Amine, Khalil and Lu, Jun and Shahbazian-Yassar, Reza},
abstractNote = {Exposed crystal facets directly affect the electrochemical/catalytic performance of MnO2 materials during their applications in supercapacitors, rechargeable batteries, and fuel cells. Currently, the facet-controlled synthesis of MnO2 is facing serious challenges due to the lack of an in-depth understanding of their surface evolution mechanisms. Here, combining aberration-corrected scanning transmission electron microscopy (STEM) and high-resolution TEM, we revealed a mutual energy-driven mechanism between beta-MnO2 nanowires and microstructures that dominated the evolution of the lateral facets in both structures. The evolution of the lateral surfaces followed the elimination of the {100} facets and increased the occupancy of {110} facets with the increase in hydrothermal retention time. Both self-growth and oriented attachment along their {100} facets were observed as two different ways to reduce the surface energies of the beta-MnO2 structures. High-density screw dislocations with the 1/2 < 100 > Burgers vector were generated consequently. As a result, the observed surface evolution phenomenon offers guidance for the facet-controlled growth of beta-MnO2 materials with high performances for its application in metal-air batteries, fuel cells, supercapacitors, etc.},
doi = {10.1007/s12274-017-1620-5},
journal = {Nano Research},
issn = {1998-0124},
number = 1,
volume = 11,
place = {United States},
year = {2017},
month = {6}
}

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Works referenced in this record:

Synthesis of Tetrahexahedral Platinum Nanocrystals with High-Index Facets and High Electro-Oxidation Activity
journal, May 2007


Direct Electrodeposition of Tetrahexahedral Pd Nanocrystals with High-Index Facets and High Catalytic Activity for Ethanol Electrooxidation
journal, June 2010

  • Tian, Na; Zhou, Zhi-You; Yu, Neng-Fei
  • Journal of the American Chemical Society, Vol. 132, Issue 22, p. 7580-7581
  • DOI: 10.1021/ja102177r