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A quick and versatile one step metal–organic chemical deposition method for supported Pt and Pt-alloy catalysts

DOI: 10.1039/D0RA03001E DOI Help

Authors: Colleen Jackson (Imperial College London) , Graham T. Smith (National Physical Laboratory) , Nobuhle Mpofu (HySA/Catalysis, Centre for Catalysis Research, University of Cape Town) , Jack M. S. Dawson (Imperial College London) , Thulile Khoza (SINTEF) , Caelin September (Unilever) , Susan M. Taylor (RD Graphene) , David W. Inwood (ZapGo Ltd) , Andrew S. Leach (University College London (UCL)) , Denis Kramer (University of Southampton) , Andrea E. Russell (University of Southampton) , Anthony R. J. Kucernak (Imperial College London) , Pieter B. J. Levecque (University of Cape Town)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Rsc Advances , VOL 10 , PAGES 19982 - 19996

State: Published (Approved)
Published: May 2020
Diamond Proposal Number(s): 16111

Open Access Open Access

Abstract: A simple, modified Metal–Organic Chemical Deposition (MOCD) method for Pt, PtRu and PtCo nanoparticle deposition onto a variety of support materials, including C, SiC, B4C, LaB6, TiB2, TiN and a ceramic/carbon nanofiber, is described. Pt deposition using Pt(acac)2 as a precursor is shown to occur via a mixed solid/liquid/vapour precursor phase which results in a high Pt yield of 90–92% on the support material. Pt and Pt alloy nanoparticles range 1.5–6.2 nm, and are well dispersed on all support materials, in a one-step method, with a total catalyst preparation time of ∼10 hours (2.4–4× quicker than conventional methods). The MOCD preparation method includes moderate temperatures of 350 °C in a tubular furnace with an inert gas supply at 2 bar, a high pressure (2–4 bar) compared to typical MOCVD methods (∼0.02–10 mbar). Pt/C catalysts with Pt loadings of 20, 40 and 60 wt% were synthesised, physically characterised, electrochemically characterised and compared to commercial Pt/C catalysts. TEM, XRD and ex situ EXAFS show similar Pt particle sizes and Pt particle shape identifiers, namely the ratio of the third to first Pt coordination numbers modelled from ex situ EXAFS, between the MOCD prepared catalysts and commercial catalysts. Moreover, electrochemical characterisation of the Pt/C MOCD catalysts obtained ORR mass activities with a maximum of 428 A gPt−1 at 0.9 V, which has similar mass activities to the commercial catalysts (80–160% compared to the commercial Pt/C catalysts).

Subject Areas: Chemistry


Instruments: B18-Core EXAFS

Added On: 04/06/2020 08:47

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Discipline Tags:

Catalysis Physical Chemistry Nanoscience/Nanotechnology Chemistry Organometallic Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)