Jump to main content
Jump to site search


Transformation of homobimetallic MOFs to nickel-cobalt phosphide/nitrogen-doped carbon polyhedral nanocages for efficient oxygen evolution electrocatalysts

Abstract

The rational design and engineering of metal-organic frameworks (MOFs) with hollow structure and complex compositions has attracted increasing research interest due to their importance in various applications. Herein, we develop a facile way for in situ transformation of cobalt-based homobimetallic zeolitic imidazolate framework polyhedra (NiCo-ZIF PH) into nickel-cobalt phosphide/nitrogen-doped carbon polyhedral nanocages (NiCoP/NC PHCs) via tannic acid etching as well as calcination and phosphidation process. Impressively, the hollow structure of polyhedral nanocages formed after etching process is robust enough to endure the subsequent thermal treatment. The as-obtained NiCoP/NC PHCs are endowed with large surface area and abundant pore volume, leading to the exposure of more active sites and rapid mass transfer. Besides, the guest metal Ni is homogeneously incorporated into the host CoP crystal lattice without phase segregation, which effectively modulates the electronic structures. Benefiting from the above advantages, the NiCoP/NC PHCs exhibit obviously improved electrocatalytic activity towards OER, with a low overpotential of 297 mV to afford the current density of 10 mA cm-2 and excellent long-term stability. Moreover, the present synthetic route is easy to scale up, which is especially appeal to practical application.

Back to tab navigation

Supplementary files

Publication details

The article was received on 18 Jul 2017, accepted on 11 Aug 2017 and first published on 12 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA06272A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
  •   Request permissions

    Transformation of homobimetallic MOFs to nickel-cobalt phosphide/nitrogen-doped carbon polyhedral nanocages for efficient oxygen evolution electrocatalysts

    X. Zhang, L. Huang, Q. Wang and S. Dong, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06272A

Search articles by author

Spotlight

Advertisements