4.7 Article

Compositional and morphological engineering of in-situ-grown Ag nanoparticles on Cu substrate for enhancing oxygen reduction reaction activity: A novel electrochemical redox tuning approach

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 571, Issue -, Pages 1-12

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.03.020

Keywords

Silver nanoparticle; In-situ redox activation; Deep eutectic solvent; Galvanic replacement; Oxygen reduction reaction

Funding

  1. National Natural Science Foundation of China [21962008, 51464028]
  2. Candidate Talents Training Fund of Yunnan Province [2017PY269SQ, 2018HB007]
  3. Thousand Talents Plan [YNWR-QNBJ-2018-346]
  4. Application Foundation Research of Yunnan Province [2017FB146]

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Silver nanoparticles (NPs) developed on a copper substrate, Ag NPs/Cu, are synthesized by a novel and facile galvanic replacement method performed in Ethaline deep eutectic solvent (DES). It reveals that the Ag NPs could be well dispersed on the Cu support via an in-situ electrochemical oxidation-reduction (ECO-ECR) activation process, which deliver significantly enhanced activity and stability for the oxygen reduction reaction (ORR) in alkaline media. The in-situ redox tuning triggers a reversible phase transformation of the formed initially Ag NPs, Ag <-> Ag2O, with surface reconstruction and gives rise to a strong metal-support interaction with tailored atomic/electronic structures, resulting in enhanced ORR activity. Impressively, the introduction of Ni-II ions can regulate the galvanic replacement kinetics by mediating the diffusion of Ag-I ions and subsequent growth of Ag on the Cu surface in Ethaline, leading to the formation of uniformly distributed Ag NPs. Coupled with redox activation, the optimal Ag-Ni-1 NPs/Cu_ECO-ECR exhibits ORR activity similar to that of the commercial state-of-the-art Pt/C catalyst, and better long-term durability (95% activity retention after 30,000 s), cyclic stability performance, and anti-poisoning capacity for methanol (96% after 3300 s), suggesting it a promising ORR electrocatalyst for practical application. (C) 2020 Elsevier Inc. All rights reserved.

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