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A Pyrene-Modified Cobalt Salophen Complex Immobilized on Multiwalled Carbon Nanotubes Acting as Precursor for Efficient Electrocatalytic Water Oxidation

Abstract

Immobilization of earth-abundant water oxidation catalysts (WOCs) on carbon supports to produce functional electrodes for electrochemical water splitting is a crucial approach for future clean energy production. Herein we report the non-covalent immobilization of a pyrene-bearing Cobalt(II) schiff base complex (2) on multiwalled carbon nanotubes (MWCNTs) surface to form a hybrid anode for electrocatalytic water oxidation. The 2/MWCNTs anode displayed excellent catalytic activity and durability in neutral aqueous solution, a catalytic current density of 1.0 mA cm-2 was achieved at 1.15 V vs normal hydrogen electrode (NHE), corresponding to a low overpotential of 330 mV. A Tafel slope of 96 mV per decade was obtained. The Faradaic efficiency of oxygen evolution was more than 90 % by bulk electrolysis measurement. After bulking electrolysis, the hybrid anode characterization using X-ray photoelectron spectroscopy (XPS) confirmed that complex 2 decomposed to form heterogeneous cobalt hydroxides and the cobalt hydroxides should be the true catalytic active species, which are responsible for electrocatalytic oxygen evolution.

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Publication details

The article was received on 16 Aug 2017, accepted on 07 Sep 2017 and first published on 07 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT03033A
Citation: Dalton Trans., 2017, Accepted Manuscript
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    A Pyrene-Modified Cobalt Salophen Complex Immobilized on Multiwalled Carbon Nanotubes Acting as Precursor for Efficient Electrocatalytic Water Oxidation

    T. Li, J. Qian, Q. Zhou, J. Lin and Y. Zheng, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03033A

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