Phase evolution and electronic properties of cryptomelane nanorods

Potassium functionalized cryptomelane-type manganese oxide (K-OMS-2) is gaining more and more attention due to its exceptional catalytic, electronic, magnetic and ion transport properties. It is therefore of great importance to have a general picture of the changes this material undergoes with the i...

Full description

Saved in:
Bibliographic Details
Published in:Journal of alloys and compounds 2018-10, Vol.767, p.592-599
Main Authors: Stelmachowski, Paweł, Legutko, Piotr, Jakubek, Tomasz, Kotarba, Andrzej
Format: Article
Language:English
Subjects:
Catalysis
Chemical synthesis
Cryptomelane
Diffraction
Electric properties
Electrodes
Gas detectors
High temperature
Ion transport
Magnetic properties
Manganese
Nanorods
Oxidation
Oxidizing atmospheres
Potassium
Potassium permanganate
Raman spectroscopy
Stability
Structure
Temperature
Thermogravimetric analysis
Work function
X ray powder diffraction
X ray spectra
X-ray diffraction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Potassium functionalized cryptomelane-type manganese oxide (K-OMS-2) is gaining more and more attention due to its exceptional catalytic, electronic, magnetic and ion transport properties. It is therefore of great importance to have a general picture of the changes this material undergoes with the increase of the temperature in reducing and oxidizing atmospheres. Potassium cryptomelane was synthesized by the reflux method in the reaction of manganese(II) acetate and potassium permanganate. It was characterized by means powder X-ray diffraction and Raman spectroscopy at characteristic stages of high-temperature treatment, determined by means of thermogravimetric analysis. Moreover, the mobility of potassium and thus induced changes of electronic properties were determined by using temperature programmed potassium desorption experiments and by following work function changes at elevated temperatures. The presented results can be used as a guideline for potential application limits, where the operation temperature and atmosphere play a crucial role. [Display omitted] •Thermal structural stability of cryptomelane was examined in different atmospheres.•Thermal stability of potassium in the cryptomelane structure was determined.•Work function changes of cryptomelane were rationalized in terms of potassium mobility.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.07.147