4.6 Article

Revealing the role of mo doping in promoting oxygen reduction reaction performance of Pt3Co nanowires

Journal

JOURNAL OF ENERGY CHEMISTRY
Volume 66, Issue -, Pages 16-23

Publisher

ELSEVIER
DOI: 10.1016/j.jechem.2021.06.018

Keywords

Pt-Co alloy; Ultrafine nanowires; Oxygen reduction reaction; Mo doping; Vacancy formation energy

Funding

  1. Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2018-06725, RGPIN-2017-05080]
  2. New Frontiers in Research Fund-Exploration program [NFRFE-2019-00488]
  3. University of Alberta and Future Energy Systems (FES)
  4. Westgrid and Compute Canada
  5. Discovery Accelerator Supplement Grant program [RGPAS-2018-522651]

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By manipulating ligand effect, structural control, and strain effect, Mo-doped Pt3Co alloy nanowires were prepared as an efficient catalyst for ORR with high specific and mass activity, excellent structural stability, and cyclic durability. Mo dopants modify the electronic structure of Pt and Co, optimizing oxygen-intermediate binding energy and increasing vacancy formation energy, leading to enhanced activity and durability. This work provides a facile methodology and in-depth investigation for future design and optimization.
Highly active and durable electrocatalysts towards oxygen reduction reaction (ORR) are imperative for the commercialization application of proton exchange membrane fuel cells. By manipulating ligand effect, structural control, and strain effect, we report here the precise preparation of Mo-doped Pt3Co alloy nanowires (Pt3Co-Mo NWs) as the efficient catalyst towards ORR with high specific activity (0.596 mA cm(2)) and mass activity (MA, 0.84 A mg(-1Y) Pt), much higher than those of undoped counterparts. Besides activity, Pt3Co-Mo NWs also demonstrate excellent structural stability and cyclic durability even after 50,000 cycles, again surpassing control samples without Mo dopants. According to the strain maps and DFT calculations, Mo dopants could modify the electronic structure of both Pt and Co to achieve not only optimized oxygen-intermediate binding energy on the interface but also increased the vacancy formation energy of Co, together leading to enhanced activity and durability. This work provides not only a facile methodology but also an in-depth investigation of the relationship between structure and properties to provide general guidance for future design and optimization. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.

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