najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2019-10-6-681-685najo-846Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХSILD synthesis of the efficient and stable electrocatalyst based on CoO–NiO solid solution toward hydrogen productionSILD synthesis of the efficient and stable electrocatalyst based on CoO–NiO solid solution toward hydrogen productionKodintsevI. А.KodintsevI. A.

194021 Saint Petersburg

194021 Saint Petersburg

i.a.kod@mail.ruMartinsonK. D.MartinsonK. D.

194021 Saint Petersburg

194021 Saint Petersburg

LobinskyА. А.LobinskyA. A.

Peterhof, 198504 Saint Petersburg

Peterhof, 198504 Saint Petersburg

PopkovV. I.PopkovV. I.

194021 Saint Petersburg

194021 Saint Petersburg

Ioffe InstituteIoffe InstituteSaint Petersburg State UniversitySaint Petersburg State University201913082025106681685Copyright © Kodintsev I.A., Martinson K.D., Lobinsky A.A., Popkov V.I., 20252025Kodintsev I.А., Martinson K.D., Lobinsky А.А., Popkov V.I.Kodintsev I.A., Martinson K.D., Lobinsky A.A., Popkov V.I.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/846

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/cm2, 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/cm2 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.

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/cm2, 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/cm2 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.

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The authors declare that there are no conflicts of interest present.