Facile doping of nickel into Co 3 O 4 nanostructures to make them efficient for catalyzing the oxygen evolution reaction.

Autor:	Bhatti AL; Institute of Physics, University of Sindh Jamshoro 76080 Sindh Pakistan., Aftab U; Mehran University of Engineering and Technology 7680 Jamshoro Sindh Pakistan., Tahira A; Department of Science and Technology, Campus Norrköping, Linköping University SE-60174 Norrköping Sweden., Abro MI; Mehran University of Engineering and Technology 7680 Jamshoro Sindh Pakistan., Kashif Samoon M; Centre of Pure and Applied Geology University of Sindh Jamshoro 76080 Sindh Pakistan., Aghem MH; Centre of Pure and Applied Geology University of Sindh Jamshoro 76080 Sindh Pakistan., Bhatti MA; Centre of Environmental Sciences 76080 Jamshoro Sindh Pakistan., HussainIbupoto Z; Institute of Chemistry, University of Sindh 76080 Jamshoro Pakistan zaffar.ibhupoto@usindh.edu.pk.
Jazyk:	angličtina
Zdroj:	RSC advances [RSC Adv] 2020 Mar 31; Vol. 10 (22), pp. 12962-12969. Date of Electronic Publication: 2020 Mar 31 (Print Publication: 2020).
DOI:	10.1039/d0ra00441c
Abstrakt:	Designing a facile and low-cost methodology to fabricate earth-abundant catalysts is very much needed for a wide range of applications. Herein, a simple and straightforward approach was developed to tune the electronic properties of cobalt oxide nanostructures by doping them with nickel and then using them to catalyze the oxygen evolution reaction (OER) in an aqueous solution of 1.0 M KOH. The addition of a nickel impurity improved the conductivity of the cobalt oxide, and further increased its activity towards the OER. Analytical techniques such as scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and powder X-ray diffraction (XRD) were used to investigate, respectively, the morphology, composition and crystalline structure of the materials used. The nickel-doped cobalt oxide material showed randomly oriented nanowires and a high density of nanoparticles, exhibited the cubic phase, and contained cobalt, nickel and oxygen as its main elements. The nickel-doped cobalt oxide also yielded a Tafel slope of 82 mV dec -1 and required an overpotential of 300 mV to reach a current density of 10 mA cm -2 . As an OER catalyst, it was shown to be durable for 40 h. Electrochemical impedance spectroscopy (EIS) analysis showed a low charge-transfer resistance of 177.5 ohms for the nickel-doped cobalt oxide, which provided a further example of its excellent OER performance. These results taken together indicated that nickel doping of cobalt oxide can be accomplished via a facile approach and that the product of this doping can be used for energy and environmental applications. Competing Interests: Authors declare no conflict of interest in this research work. (This journal is © The Royal Society of Chemistry.)
Databáze:	MEDLINE
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