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

• Published in: Dalton transactions : an international journal of inorganic chemistry 2017-10, Vol.46 (38), p.13020-13026
• Main Authors: Li, Ting-Ting, Qian, Jinjie, Zhou, Qianqian, Lin, Jian-Li, Zheng, Yue-Qing
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c7dt03033a

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 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.