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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Pillared Mo2TiC2MXene for high-power and long-life lithium and sodium-ion batteries
AU - Maughan, P.A.
AU - Bouscarrat, L.
AU - Seymour, V.R.
AU - Shao, S.
AU - Haigh, S.J.
AU - Dawson, R.
AU - Tapia-Ruiz, N.
AU - Bimbo, N.
PY - 2021/6/7
Y1 - 2021/6/7
N2 - In this work, we apply an amine-assisted silica pillaring method to create the first example of a porous Mo2TiC2MXene with nanoengineered interlayer distances. The pillared Mo2TiC2has a surface area of 202 m2g−1, which is among the highest reported for any MXene, and has a variable gallery height between 0.7 and 3 nm. The expanded interlayer distance leads to significantly enhanced cycling performance for Li-ion storage, with superior capacity, rate capably and cycling stability in comparison to the non-pillared analogue. The pillared Mo2TiC2achieved a capacity over 1.7 times greater than multilayered MXene at 20 mA g−1(≈320 mA h g−1) and 2.5 times higher at 1 A g−1(≈150 mA h g−1). The fast-charging properties of pillared Mo2TiC2are further demonstrated by outstanding stability even at 1 A g−1(under 8 min charge time), retaining 80% of the initial capacity after 500 cycles. Furthermore, we use a combination of spectroscopic techniques (i.e.XPS, NMR and Raman) to show unambiguously that the charge storage mechanism of this MXene occurs by a conversion reaction through the formation of Li2O. This reaction increases by 2-fold the capacity beyond intercalation, and therefore, its understanding is crucial for further development of this family of materials. In addition, we also investigate for the first time the sodium storage properties of the pillared and non-pillared Mo2TiC2
AB - In this work, we apply an amine-assisted silica pillaring method to create the first example of a porous Mo2TiC2MXene with nanoengineered interlayer distances. The pillared Mo2TiC2has a surface area of 202 m2g−1, which is among the highest reported for any MXene, and has a variable gallery height between 0.7 and 3 nm. The expanded interlayer distance leads to significantly enhanced cycling performance for Li-ion storage, with superior capacity, rate capably and cycling stability in comparison to the non-pillared analogue. The pillared Mo2TiC2achieved a capacity over 1.7 times greater than multilayered MXene at 20 mA g−1(≈320 mA h g−1) and 2.5 times higher at 1 A g−1(≈150 mA h g−1). The fast-charging properties of pillared Mo2TiC2are further demonstrated by outstanding stability even at 1 A g−1(under 8 min charge time), retaining 80% of the initial capacity after 500 cycles. Furthermore, we use a combination of spectroscopic techniques (i.e.XPS, NMR and Raman) to show unambiguously that the charge storage mechanism of this MXene occurs by a conversion reaction through the formation of Li2O. This reaction increases by 2-fold the capacity beyond intercalation, and therefore, its understanding is crucial for further development of this family of materials. In addition, we also investigate for the first time the sodium storage properties of the pillared and non-pillared Mo2TiC2
KW - Fast charging (Batteries)
KW - Lithium
KW - Lithium-ion batteries
KW - Metal ions
KW - Molybdenum compounds
KW - Silica
KW - Storage (materials)
KW - Titanium compounds
KW - Charging property
KW - Conversion reactions
KW - Cycling performance
KW - Cycling stability
KW - Interlayer distance
KW - Pillaring method
KW - Spectroscopic technique
KW - Storage properties
KW - Sodium-ion batteries
U2 - 10.1039/d1na00081k
DO - 10.1039/d1na00081k
M3 - Journal article
VL - 3
SP - 3145
EP - 3158
JO - Nanoscale Advances
JF - Nanoscale Advances
SN - 2516-0230
IS - 11
ER -