scholarly journals Illustration of charge transfer in graphene-coated hexagonal ZnO photocatalysts using Kelvin probe force microscopy

RSC Advances ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 885-894 ◽  
Author(s):  
Yunlong Zhang ◽  
Yuzhi Zhang ◽  
Lixin Song ◽  
Yang Su ◽  
Yunfeng Guo ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Three Dimensional ◽  
Kelvin Probe Force Microscopy ◽  
Methyl Blue ◽  
Kelvin Probe ◽  
Force Microscopy ◽  
Before And After

The Fermi levels and three-dimensional band diagrams of the synthesized HZO@Gr composites in methyl blue (MB) solution before and after equilibrium were assumed.

scholarly journals Measurement of polarization effects in dual-phase ceria-based oxygen permeation membranes using Kelvin probe force microscopy

2021 ◽  
Vol 12 ◽  
pp. 1380-1391
Author(s):  
Kerstin Neuhaus ◽  
Christina Schmidt ◽  
Liudmila Fischer ◽  
Wilhelm Albert Meulenberg ◽  
Ke Ran ◽  
...  
Keyword(s):  
Perovskite Phase ◽  
Chemical Diffusion ◽  
Kelvin Probe Force Microscopy ◽  
Chemical Diffusion Coefficient ◽  
Dual Phase ◽  
Kelvin Probe ◽  
Force Microscopy ◽  
Conductive Phase ◽  
Volta Potential ◽  
Before And After

In this study, a dual phase composite (CSO-FC2O) consisting of 60 vol % Ce0.8Sm0.2O1.9 as oxygen-conductive phase and 40 vol % FeCo2O4 as electron-conductive phase was synthesized. TEM measurements showed a relatively pure dual-phase material with only minor amounts of a tertiary (Sm,Ce)(Fe,Co)O3 perovskite phase and isolated residues of a rock salt phase at the grain boundaries. The obtained material was used as a model to demonstrate that a combination of polarization relaxation measurements and Kelvin probe force microscopy (KPFM)-based mapping of the Volta potential before and after the end of polarization can be used to determine the chemical diffusion coefficient of the ceria component of the composite. The KPFM measurements were performed at room temperature and show diffusion coefficients in the range of 3 × 10−13 cm2·s−1, which is comparable to values measured for single-phase Gd-doped ceria thin films using the same method.

Sign in / Sign up

Export Citation Format

Share Document