Angewandte Chemie (International ed. in English), Jan 26, 2017
Light alkenes are important raw materials for the synthesis of polymers and other products. Tradi... more Light alkenes are important raw materials for the synthesis of polymers and other products. Traditionally they are obtained from steam cracking and catalytic cracking. However, (oxidative) dehydrogenation of alkanes is gaining more importance to produce alkenes directly from natural gas. Here we report that Ti3AlC2, a MAX phase, which hitherto had not used in catalysis, efficiently catalyses the ODH of n-butane to butenes and butadiene, important intermediates for the synthesis of polymers and other compounds. The catalyst, which combines both metallic and ceramic properties, is stable for at least 30 h on stream, even at low O2:butane ratios without suffering from coking. This material has neither lattice oxygens nor noble metals, yet a unique combination of numerous defects and a thin surface Ti1-yAlyO2-y/2 layer that is rich in oxygen vacancies makes it an active catalyst. Given the large number of compositions available, MAX phases may find applications in several reactions.
Tailored synthesis method is used to produce higher yield of (Mo2/3Y1/3)2AlC i-MAX, for realizati... more Tailored synthesis method is used to produce higher yield of (Mo2/3Y1/3)2AlC i-MAX, for realization of 2D Mo1.33CTz MXene with ordered vacancies, the latter shows electrochemical performance equivalent to that produced from the Sc containing i-MAX.
Enhancing both the energy storage and power capabilities of electrochemical capacitors remains a ... more Enhancing both the energy storage and power capabilities of electrochemical capacitors remains a challenge. Herein, Ti3C2Tz MXene is mixed with MoO3 nanobelts in various mass ratios and the mixture is used to vacuum filter binder free, open, flexible, and free‐standing films. The conductive Ti3C2Tz flakes bridge the nanobelts, facilitating electron transfer; the randomly oriented, and interconnected, MoO3 nanobelts, in turn, prevent the restacking of the Ti3C2Tz nanosheets. Benefitting from these advantages, a MoO3/Ti3C2Tz film with a 8:2 mass ratio exhibits high gravimetric/volumetric capacities with good cyclability, namely, 837 C g−1 and 1836 C cm−3 at 1 A g−1 for an ≈ 10 µm thick film; and 767 C g−1 and 1664 C cm−3 at 1 A g−1 for ≈ 50 µm thick film. To further increase the energy density, hybrid capacitors are fabricated with MoO3/Ti3C2Tz films as the negative electrodes and nitrogen‐doped activated carbon as the positive electrodes. This device delivers maximum gravimetric/volu...
MXenes are synthesized by chemically exfoliating well-defined V2AlC, single-crystal pillars. Exfo... more MXenes are synthesized by chemically exfoliating well-defined V2AlC, single-crystal pillars. Exfoliation is studied as a function of orientation and time using HF. This reveals that no etching can take place by HF penetration through the basal planes.
Electrospun natural polymeric bandages are highly desirable due to their low-cost, biodegradabili... more Electrospun natural polymeric bandages are highly desirable due to their low-cost, biodegradability, non-toxicity and antimicrobial properties.
Angewandte Chemie (International ed. in English), Jan 26, 2017
Light alkenes are important raw materials for the synthesis of polymers and other products. Tradi... more Light alkenes are important raw materials for the synthesis of polymers and other products. Traditionally they are obtained from steam cracking and catalytic cracking. However, (oxidative) dehydrogenation of alkanes is gaining more importance to produce alkenes directly from natural gas. Here we report that Ti3AlC2, a MAX phase, which hitherto had not used in catalysis, efficiently catalyses the ODH of n-butane to butenes and butadiene, important intermediates for the synthesis of polymers and other compounds. The catalyst, which combines both metallic and ceramic properties, is stable for at least 30 h on stream, even at low O2:butane ratios without suffering from coking. This material has neither lattice oxygens nor noble metals, yet a unique combination of numerous defects and a thin surface Ti1-yAlyO2-y/2 layer that is rich in oxygen vacancies makes it an active catalyst. Given the large number of compositions available, MAX phases may find applications in several reactions.
Tailored synthesis method is used to produce higher yield of (Mo2/3Y1/3)2AlC i-MAX, for realizati... more Tailored synthesis method is used to produce higher yield of (Mo2/3Y1/3)2AlC i-MAX, for realization of 2D Mo1.33CTz MXene with ordered vacancies, the latter shows electrochemical performance equivalent to that produced from the Sc containing i-MAX.
Enhancing both the energy storage and power capabilities of electrochemical capacitors remains a ... more Enhancing both the energy storage and power capabilities of electrochemical capacitors remains a challenge. Herein, Ti3C2Tz MXene is mixed with MoO3 nanobelts in various mass ratios and the mixture is used to vacuum filter binder free, open, flexible, and free‐standing films. The conductive Ti3C2Tz flakes bridge the nanobelts, facilitating electron transfer; the randomly oriented, and interconnected, MoO3 nanobelts, in turn, prevent the restacking of the Ti3C2Tz nanosheets. Benefitting from these advantages, a MoO3/Ti3C2Tz film with a 8:2 mass ratio exhibits high gravimetric/volumetric capacities with good cyclability, namely, 837 C g−1 and 1836 C cm−3 at 1 A g−1 for an ≈ 10 µm thick film; and 767 C g−1 and 1664 C cm−3 at 1 A g−1 for ≈ 50 µm thick film. To further increase the energy density, hybrid capacitors are fabricated with MoO3/Ti3C2Tz films as the negative electrodes and nitrogen‐doped activated carbon as the positive electrodes. This device delivers maximum gravimetric/volu...
MXenes are synthesized by chemically exfoliating well-defined V2AlC, single-crystal pillars. Exfo... more MXenes are synthesized by chemically exfoliating well-defined V2AlC, single-crystal pillars. Exfoliation is studied as a function of orientation and time using HF. This reveals that no etching can take place by HF penetration through the basal planes.
Electrospun natural polymeric bandages are highly desirable due to their low-cost, biodegradabili... more Electrospun natural polymeric bandages are highly desirable due to their low-cost, biodegradability, non-toxicity and antimicrobial properties.
Uploads
Papers by Michel Barsoum