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Lookup NU author(s): Dr Maryam Bayati,
Emeritus Professor Keith Scott
This is the authors' accepted manuscript of an article that has been published in its final definitive form by American Chemical Society, 2020.
For re-use rights please refer to the publisher's terms and conditions.
© 2019 American Chemical Society.Ammonia will play a pivotal role in the future of zero carbon emitted sustainable fuel. The development of inexpensive efficient catalysts for ammonia electro-oxidation (AEO) is essential to its success. This study provides evidence that nanoparticles of earth-abundant elements, e.g., MoC, encapsulated in a doped-graphene shell (DG-MoC), are promising cocatalysts of Pt for AEO which significantly improve the catalyst cost and activity in comparison to the state-of-the-art platinum. DG-MoC, DG-MoC-supported Pt (Pt/DG-MoC), and nitrogen-doped-graphene (NG) catalysts were synthesized and characterized by Brunauer-Emmett-Teller (BET) surface area analysis, electrochemical techniques, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM) combined with energy-dispersive X-ray (EDX), scanning transmission electron microscopy (STEM), and electron energy loss (EEL) spectroscopy. The XRD analysis of DG-MoC disclosed that the presence of α-MoC1-x microscopy techniques demonstrates a close vicinity of Pt and MoC nanoparticles in Pt/DG-MoC. We report, for the first time, that Pt/DG-MoC particles reveal a large synergistic effect for AEO activity, while DG-MoC and NG showed no activity. Pt/DG-MoC gave a higher current density, lower half-A nd peak-potentials (28 mV and 14 mV, respectively), and greater resilience to ammonia poisoning than Pt/C as shown in the fall in the peak current density in the second voltammogram, i.e, approximately 3.6% compared to 20.7% for Pt/C. The XPS spectrum of the catalysts explained the source of this synergistic effect.
Author(s): Bayati M, Liu X, Abellan P, Pocock D, Dixon M, Scott K
Publication type: Article
Publication status: Published
Journal: ACS Applied Energy Materials
Print publication date: 27/01/2020
Online publication date: 11/12/2019
Acceptance date: 11/12/2019
Date deposited: 24/02/2020
ISSN (print): 2574-0962
Publisher: American Chemical Society
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