Theoretical Investigation of Quantum Capacitance of M 2 C MXenes as Supercapacitor Electrode
MXenes are promising electrode materials due to their excellent performance. However, the quantum capacitance ( C diff ) and surface storage charge ( Q ) of bare M 2 C are little reported theoretically up to now. Herein, C diff and Q of 12 M 2 C MXenes related with 3d, 4d, and 5d transition metal (T...
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| Published in | physica status solidi (b) Vol. 260; no. 12 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
01.12.2023
|
| Online Access | Get full text |
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| Summary: | MXenes are promising electrode materials due to their excellent performance. However, the quantum capacitance (
C
diff
) and surface storage charge (
Q
) of bare M
2
C are little reported theoretically up to now. Herein,
C
diff
and
Q
of 12 M
2
C MXenes related with 3d, 4d, and 5d transition metal (TM) atoms are investigated in aqueous and ionic/organic systems. All M
2
C MXenes are metallic. M
2
C with 5d TM are cathode materials. M
2
C with 4d TM are also cathode materials except Y
2
C MXene. For M
2
C with 3d TM, Sc
2
C and Mn
2
C are cathode materials, while Ti
2
C, V
2
C, and Cr
2
C are anode materials, especially for Ti
2
C and V
2
C with larger |
Q
p
|/|
Q
n
| and
Q
p
. The broadened voltage maintains the type of electrode materials. W
2
C is the least promising cathode material in broad voltage. |
|---|---|
| ISSN: | 0370-1972 1521-3951 |
| DOI: | 10.1002/pssb.202300386 |