Geodesic
SILD synthesis of the efficient and stable electrocatalyst based on CoO-NiO solid solution toward hydrogen production
Nanosistemy: fizika, himiâ, matematika, Tome 10 (2019) no. 6, pp. 681-685

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Currently, nanocrystalline NiO is well known as one of the best non-noble metal electrode material with low overpotential (OP) but mediocre stability. On the contrary, CoO has remarkable stability but the high values of OP. In this work, a method is proposed to achieve the stability of nickel oxide-based electrode materials while maintaining a low OP via the synthesis of a nanocrystalline CoO-NiO solid solution. Nanocrystals of CoO-NiO solid solution were synthesized by successive ionic layer deposition (SILD). XRD, SEM, and EDX analysis show that the CoO-NiO sample consists of 3–5 nm isometric crystallites of the solid solution mentioned above and Ni/Co ratio is equal to 45.4 % / 54.6 % at. Electrochemical investigation of the nanocrystalline CoO-NiO solution as electrode material shows OP values of -240 mV at a current density (CD) of 10 mA/cm$^{2}$, Tafel slope values of 78 mV/dec for hydrogen production from water-ethanol solution (10 % vol.) and high cyclic stability - only 3 mV degradation at 10 mA/cm$^{2}$ after 100 cycles of cyclic voltammetry. Thus, it was shown that the synthesis of a solid solution within the proposed approach makes it possible to maintain the high electrocatalytic properties inherent in NiO, but with high stability in a wide range of overpotential and in the high cyclic load inherent in CoO.
Keywords: nickel oxide, cobalt oxide, successive ionic layer deposition, electrocatalytic reforming.
Mots-clés : hydrogen evolution 
@article{NANO_2019_10_6_a10,
     author = {I. A. Kodintsev and K. D. Martinson and A. A. Lobinsky and V. I. Popkov},
     title = {SILD synthesis of the efficient and stable electrocatalyst based on {CoO-NiO} solid solution toward hydrogen production},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {681--685},
     publisher = {mathdoc},
     volume = {10},
     number = {6},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2019_10_6_a10/}
}
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I. A. Kodintsev; K. D. Martinson; A. A. Lobinsky; V. I. Popkov. SILD synthesis of the efficient and stable electrocatalyst based on CoO-NiO solid solution toward hydrogen production. Nanosistemy: fizika, himiâ, matematika, Tome 10 (2019) no. 6, pp. 681-685. http://geodesic.mathdoc.fr/item/NANO_2019_10_6_a10/