Ultrafine Dual-Phased Carbide Nanocrystals Confined in Porous Nitrogen-Doped Carbon Dodecahedrons for Efficient Hydrogen Evolution Reaction

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Detail(s)

Original languageEnglish
Article number1900699
Journal / PublicationAdvanced Materials
Volume31
Issue number30
Online published6 Jun 2019
Publication statusPublished - 26 Jul 2019
Externally publishedYes

Abstract

Designing novel non-noble electrocatalysts with controlled structures and composition remains a great challenge for efficient hydrogen evolution reaction (HER). Herein, a rational synthesis of ultrafine carbide nanocrystals confined in porous nitrogen-doped carbon dodecahedrons (PNCDs) by annealing functional zeolitic imidazolate framework (ZIF-8) with molybdate or tungstate is reported. By controlling the substitution amount of MO4 units (M = Mo or W) in the ZIF-8 framework, dual-phase carbide nanocrystals confined in PNCDs (denoted as MC-M2C/PNCDs) can be obtained, which exhibit superior activity toward the HER to the single-phased MC/PNCDs and M2C/PNCDs. The evenly distributed ultrafine nanocrystals favor the exposure of active sites. PNCDs as the support facilitate charge transfer and protect the nanocrystals from aggregation during the HER process. Moreover, the strong coupling interactions between MC and M2C provide beneficial sites for both water dissociation and hydrogen desorption. This work highlights a new feasible strategy to explore efficient electrocatalysts via engineering on nanostructure and composition. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Research Area(s)

  • carbides, dual-phased, electrocatalysis, hydrogen evolution reaction, N-doped carbon