Construction of hierarchical FeP/Ni2P hollow nanospindles for efficient oxygen evolution

Journal Article (Journal Article)

In this work, we demonstrate the design and construction of hierarchical FeP/Ni2P hybrid hollow nanospindles (HNSs) as an active and stable electrocatalyst for the oxygen evolution reaction (OER). Employing solid FeOOH NSs coated with a thin layer of SiO2 as the template and Ni(NO3)2·6H2O as the reagent, 2D nickel silicate (Ni3Si4O10(OH)2·5H2O) nanosheets were grown on the surface of the FeOOH spindles through a facile solvothermal method to produce hierarchical FeOOH@Ni3Si4O10(OH)2·5H2O hybrid NSs. Following a subsequent phosphorization treatment, the as-prepared solid composite NSs were successfully converted into FeP/Ni2P HNSs. The SiO2 nanocoating was found to play a crucial role in this synthesis, and served not only as a reagent for the solvothermal reaction, but also as a nanoreactor for preserving the template morphology after the phosphorization treatment. Benefiting from the unique hollow and hierarchical nanoscaled hybrid structure, the FeP/Ni2P HNS electrocatalyst displays superior electrocatalytic activity for the OER to FexP, Ni2P and the physical mixture of FexP and Ni2P samples, achieving an overpotential of 234 mV at a current density of 10 mA cm-2 in 1 M KOH and a relatively low Tafel slope of 56 mV dec-1.

Full Text

Duke Authors

Cited Authors

  • Feng, Y; Xu, C; Hu, E; Xia, B; Ning, J; Zheng, C; Zhong, Y; Zhang, Z; Hu, Y

Published Date

  • January 1, 2018

Published In

Volume / Issue

  • 6 / 29

Start / End Page

  • 14103 - 14111

Electronic International Standard Serial Number (EISSN)

  • 2050-7496

International Standard Serial Number (ISSN)

  • 2050-7488

Digital Object Identifier (DOI)

  • 10.1039/c8ta03933j

Citation Source

  • Scopus