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Issue 38, 2017
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A pyrene-modified cobalt salophen complex immobilized on multiwalled carbon nanotubes acting as a precursor for efficient electrocatalytic water oxidation

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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 the surface of multiwalled carbon nanotubes (MWCNTs) to form a hybrid anode for electrocatalytic water oxidation. The 2/MWCNT anode displayed excellent catalytic activity and durability in neutral aqueous solution, and a catalytic current density of 1.0 mA cm−2 was achieved at 1.15 V vs. the 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 bulk 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 true catalytic active species, which are responsible for electrocatalytic oxygen evolution.

Graphical abstract: A pyrene-modified cobalt salophen complex immobilized on multiwalled carbon nanotubes acting as a precursor for efficient electrocatalytic water oxidation

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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., 2017,46, 13020-13026
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    A pyrene-modified cobalt salophen complex immobilized on multiwalled carbon nanotubes acting as a precursor for efficient electrocatalytic water oxidation

    T. Li, J. Qian, Q. Zhou, J. Lin and Y. Zheng, Dalton Trans., 2017, 46, 13020
    DOI: 10.1039/C7DT03033A

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