Atomic Dispersion and Surface Enrichment of Palladium in Nitrogen-Doped Porous Carbon Cages Leads to High-Performance Electrocatalytic Reduction of Oxygen.

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2020
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Abstract
Metal-nitrogen-carbon (MNC) nanocomposites have been hailed as promising, efficient electrocatalysts toward oxygen reduction reaction (ORR) due to the formation of MNx coordination moieties. However, MNC hybrids are mostly prepared by pyrolysis of organic precursors along with select metal salts, where part of the MNx sites are inevitably buried in the carbon matrix. This limited accessibility compromises the electrocatalytic performance. Herein, we describe a wet-impregnation procedure by facile thermal refluxing whereby palladium is atomically dispersed and enriched onto the surface of hollow, nitrogen-doped carbon (HNC) forming Pd-N coordination bonds. The obtained Pd-HNC nanocomposites exhibited an ORR activity in alkaline media markedly higher than that of metallic Pd nanoparticles, and the best sample even outperforms commercial Pt/C and relevant Pd-based catalysts reported in the literature. The results suggest that atomic dispersion and surface enrichment of palladium in a carbon matrix may serve as an effective strategy in the fabrication of high-performance ORR electrocatalysts.
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liu2020atomicacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Liu, Qiming;Peng, Yi;Li, Qiaoxia;He, Ting;Morris, David J;Nichols, Forrest;Mercado, Rene;Zhang, Peng;Chen, Shaowei;
Journal ACS applied materials & interfaces
Year 2020
DOI
10.1021/acsami.0c03415
URL
Keywords
acid-washing atomically dispersed ni chronoamperometry cyclic voltammetry (cv) methanol tolerance non-precious orr catalyst proton exchange membrane fuel cells (pemfc)

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