Cobalt-Exchanged Poly(Heptazine Imides) as Transition Metal-Nx Electrocatalysts for the Oxygen Evolution Reaction

Meng-Yang Ye; Shuang Li; Xiaojia Zhao; Nadezda V Tarakina; Christian Teutloff; Wing Ying Chow; Robert Bittl; Arne Thomas

doi:10.1002/adma.201903942

Cobalt-Exchanged Poly(Heptazine Imides) as Transition Metal-N_x Electrocatalysts for the Oxygen Evolution Reaction

Adv Mater. 2020 Mar;32(9):e1903942. doi: 10.1002/adma.201903942. Epub 2020 Jan 27.

Authors

Meng-Yang Ye¹, Shuang Li¹, Xiaojia Zhao¹, Nadezda V Tarakina², Christian Teutloff³, Wing Ying Chow⁴, Robert Bittl³, Arne Thomas¹

Affiliations

¹ Department of Chemistry, Functional Materials, Technische Universität Berlin, Hardenbergstr. 40, 10623, Berlin, Germany.
² Max Planck Institute of Colloids & Interfaces, Department of Colloid Chemistry, D-14476, Potsdam, Germany.
³ Freie Universität Berlin, Fachbereich Physik, Berlin Joint EPR Lab, Arnimallee 14, D-14195, Berlin, Germany.
⁴ Leibniz-Forschungsinstitut für Molekulare Pharmakologie im Forschungsverbund Berlin e.V. (FMP), Campus Berlin-Buch, Robert-Rössle-Str. 10, 13125, Berlin, Germany.

PMID: 31984551
DOI: 10.1002/adma.201903942

Abstract

Poly(heptazine imides) hosting cobalt ions as countercations are presented as promising electrocatalysts for the oxygen evolution reaction (OER). A facile mixed-salt melt-assisted condensation is developed to prepare such cobalt poly(heptazine imides) (PHI-Co). The Co ions can be introduced in well-controlled amounts using this method, and are shown to be atomically dispersed within the imide-linked heptazine matrix. When applied to electrocatalytic OER, PHI-Co shows a remarkable activity with an overpotential of 324 mV and Tafel slope of 44 mV dec^-1 in 1 m KOH.

Keywords: M-Nx-C; carbon nitride; electrocatalysis; oxygen evolution reaction; poly(heptazine imides).

Abstract

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