Atomic-Layer Deposition of the Single-Atom Pt Catalyst on Vertical Graphene for H2 SensingClick to copy article linkArticle link copied!
- Bo Liu*Bo Liu*Email: [email protected]Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, United StatesMore by Bo Liu
- Zhaojun HanZhaojun HanCSIRO Manufacturing, P.O. Box 218, 36 Bradfield Road, Lindfield 2070, NSW, AustraliaSchool of Chemical Engineering, The University of New South Wales, Kensington 2052, NSW, AustraliaSchool of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane 4000, QLD, AustraliaMore by Zhaojun Han
- Avi BendavidAvi BendavidCSIRO Manufacturing, P.O. Box 218, 36 Bradfield Road, Lindfield 2070, NSW, AustraliaSchool of Materials Science and Engineering, The University of New South Wales, Kensington 2052, NSW, AustraliaMore by Avi Bendavid
- Philip J. MartinPhilip J. MartinCSIRO Manufacturing, P.O. Box 218, 36 Bradfield Road, Lindfield 2070, NSW, AustraliaMore by Philip J. Martin
- Priyank V. KumarPriyank V. KumarSchool of Chemical Engineering, The University of New South Wales, Kensington 2052, NSW, AustraliaMore by Priyank V. Kumar
- Yousof HaghshenasYousof HaghshenasSchool of Chemical Engineering, The University of New South Wales, Kensington 2052, NSW, AustraliaMore by Yousof Haghshenas
- Mohammed AlamriMohammed AlamriDepartment of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, United StatesDepartment of Physics, Faculty of Science, Umm Al-Qura University, Makkah 21955, Saudi ArabiaMore by Mohammed Alamri
- Judy Z. Wu*Judy Z. Wu*Email: [email protected]Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, United StatesMore by Judy Z. Wu
Abstract
Single-atom catalysts have the advantage of high chemical efficiency, which requires atomic-scale control during catalyst formation. In order to address this challenge, this work explores the synthesis of single-atom platinum (SA-Pt) catalysts using atomic-layer deposition (ALD) on vertical graphene (VG), in which a large number of graphene edges serve as energetically favorable nucleation sites for SA-Pt, as predicted by density functional theory calculations. Interestingly, SA-Pt has been achieved on VGs at low ALD cycle numbers of up to 60. With a further increase in the number of ALD cycles, an increasing number of Pt clusters with diameters <2 nm and Pt nanoparticles (NPs) with diameters >2 nm become dominant (nano-Pt @VG). This is in contrast to the observation of predominantly nano-Pt on other carbon nanostructures, such as carbon nanotubes and monolayer graphene, under the same ALD growth conditions, indicating that the edge states on VG indeed play a critical role in facilitating the formation of SA-Pt. Profound differences are revealed in a comparative study on H2 sensing. SA-Pt exhibits both a higher sensitivity and faster response than its nano-Pt counterpart by more than an order of magnitude, illustrating the high catalytic efficiency of SA-Pt and its potential for gas sensing and a variety of other catalytic applications.
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