Morphology controlled graphene-alloy nanoparticle hybrids with tunable carbon monoxide conversion to carbon dioxide

Author(s)

Devi, M. Manolata ^[1] ; Dolai, N. ^[1] ; Sreehala, S. ^[2] ; Jaques, Y. M. ^{[3, 4, 5]} ; Mishra, R. S. Kumar ^[2] ; Galvao, Douglas S. ^{[3, 4]} ; Tiwary, C. S. ^{[5, 6]} ; Sharma, Sudhanshu ^[2] ; Biswas, Krishanu ^[1]

Affiliation

^[1] Indian Inst Technol, Dept Mat Sci & Engn, Kanpur 208016, Uttar Pradesh - India

^[2] Indian Inst Technol Gandhinagar, Dept Chem, Gandhinagar 382355 - India

^[3] Univ Estadual Campinas, Appl Phys Dept, BR-13083859 Campinas, SP - Brazil

^[4] Univ Estadual Campinas, Ctr Computat Engn & Sci, Campinas, SP - Brazil

^[5] Rice Univ, Mat Sci & Nano Engn, Houston, TX 77005 - USA

^[6] Indian Inst Technol Gandhinagar, Mat Sci & Engn, Gandhinagar 382355 - India

• Document type: Journal article
• Source: NANOSCALE; v. 10, n. 18, p. 8840-8850, MAY 14 2018.
• Web of Science Citations: 2

Abstract

Selective oxidation of CO to CO2 using metallic or alloy nanoparticles as catalysts can solve two major problems of energy requirements and environmental pollution. Achieving 100% conversion efficiency at a lower temperature is a very important goal. This requires sustained efforts to design and develop novel supported catalysts containing alloy nanoparticles. In this regard, the decoration of nanoalloys with graphene, as a support for the catalyst, can provide a novel structure due to the synergic effect of the nanoalloys and graphene. Here, we demonstrate the effect of nano-PdPt (Palladium-Platinum) alloys having different morphologies on the catalytic efficiency for the selective oxidation of CO. Efforts were made to prepare different morphologies of PdPt alloy nanoparticles with the advantage of tuning the capping agent (PVP - polyvinyl pyrollidone) and decorating them on graphene sheets via the wet-chemical route. The catalytic activity of the G-PdPt hybrids with an urchin-like morphology has been found to be superior (higher % conversion at 135 degrees C lower) to that with a nanoflower morphology. The above experimental observations are further supported by molecular dynamics (MD) simulations. (AU)

• FAPESP's process: 13/08293-7 - CCES - Center for Computational Engineering and Sciences
• Grantee: Munir Salomao Skaf
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 16/12341-5 - Effect of Contaminants on Wettability Properties of 2D Materials
• Grantee: Ygor Morais Jaques
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate