1 research outputs found
Self-Assembled Molecular Hybrids of CoS-DNA for Enhanced Water Oxidation with Low Cobalt Content
Water oxidation in
alkaline medium was efficiently catalyzed by the self-assembled molecular
hybrids of CoS-DNA that had 20 times lower Co loading than the commonly
used loading. The morphological outcome was directed by varying the
molar ratio of metal precursor CoÂ(Ac)<sub>2</sub> and DNA and three
different sets of CoS-DNA molecular hybrids, viz. CoS-DNA(0.036),
CoS-DNA(0.06), and CoS-DNA(0.084) were prepared. These morphologically
distinct hybrids had shown similar electrocatalytic behavior, because
of the fact that they all contained the same cobalt content. The CoS-DNA(0.036),
CoS-DNA(0.06), and CoS-DNA(0.084) required very low overpotentials
of 350, 364, and 373 mV at a current density of 10 mA cm<sup>–2</sup> (1 M KOH), respectively. The advantages of lower overpotential,
lower Tafel slope (42.7 mV dec<sup>–1</sup>), high Faradaic
efficiency (90.28%), high stability and reproducibility after all,
with a lower cobalt loading, have certainly shown the worth of these
molecular hybrids in large-scale water oxidation. Moreover, since
DNA itself a good binder, CoS-DNA molecular hybrids were directly
casted on substrate electrodes and used after drying. It also showed
minimum intrinsic resistance as DNA is a good ionic and electronic
conductor. Besides, the present method may also be extended for the
preparation of other active electrocatalysts for water splitting