TY - JOUR

T1 - Ni(II) doped FeOOH 2D nanocrystals, synthesized by Successive Ionic Layer Deposition, and their electrocatalytic properties during oxygen evolution reaction upon water splitting in the alkaline medium

AU - Tolstoy, V. P.

AU - Kuklo, L. I.

AU - Gulina, L. B.

PY - 2019/5/25

Y1 - 2019/5/25

N2 - Nanolayers of Ni(II) doped FeOOH 2D nanocrystals were for the first time synthesized on the surface of nickel foam and single crystalline silicon wafer through Successive Ionic Layer Deposition (SILD) method by using an aqueous solution of Fe(NH 4 ) 2 (SO 4 ) 2 with the equilibrium pH value, as well as the solution containing Ni(NO 3 ) 2 and NH 4 NO 3 with pH = 9.5 reached by addition of ammonia. The obtained nanolayers were investigated by SEM, HRTEM, TEM, EDX, XRD, XPS and FTIR spectroscopy. They were stated to be formed by Ni:FeOOH 2D nanocrystals with lepidocrocite and goethite crystal structures having the morphology of nanosheets. They are 2–5 nm thick with planar dimensions of about 30–50 nm and the ratio of atomic concentrations of Ni to Fe is 25%. The nanolayers were shown to exhibit electrocatalytic properties during the oxygen evolution reaction upon water splitting in the alkaline medium. For the first time it was shown that the overpotential value can be precisely set by varying the number of SILD cycles these properties can be changed precisely. For a number of samples, synthesized after 20–80 SILD cycles, it was found for a current density of 10 mA/cm 2 the lowest overpotential value of 239 mV was obtained for the sample synthesized after 60 SILD cycles. The synthesis of a wide range of electrocatalytic nanolayers by SILD with the precise structural and chemical characteristics was suggested.

AB - Nanolayers of Ni(II) doped FeOOH 2D nanocrystals were for the first time synthesized on the surface of nickel foam and single crystalline silicon wafer through Successive Ionic Layer Deposition (SILD) method by using an aqueous solution of Fe(NH 4 ) 2 (SO 4 ) 2 with the equilibrium pH value, as well as the solution containing Ni(NO 3 ) 2 and NH 4 NO 3 with pH = 9.5 reached by addition of ammonia. The obtained nanolayers were investigated by SEM, HRTEM, TEM, EDX, XRD, XPS and FTIR spectroscopy. They were stated to be formed by Ni:FeOOH 2D nanocrystals with lepidocrocite and goethite crystal structures having the morphology of nanosheets. They are 2–5 nm thick with planar dimensions of about 30–50 nm and the ratio of atomic concentrations of Ni to Fe is 25%. The nanolayers were shown to exhibit electrocatalytic properties during the oxygen evolution reaction upon water splitting in the alkaline medium. For the first time it was shown that the overpotential value can be precisely set by varying the number of SILD cycles these properties can be changed precisely. For a number of samples, synthesized after 20–80 SILD cycles, it was found for a current density of 10 mA/cm 2 the lowest overpotential value of 239 mV was obtained for the sample synthesized after 60 SILD cycles. The synthesis of a wide range of electrocatalytic nanolayers by SILD with the precise structural and chemical characteristics was suggested.

KW - Electrocatalyst

KW - Electrocatalytic properties

KW - Ni(II) doped FeOOH 2D nanocrystals

KW - Oxygen evolution reaction

KW - SILD

KW - OXIDATION

KW - NANOLAYERS

KW - FE(III)

KW - ULTRATHIN

KW - CONVERSION

KW - NANOSHEETS

KW - NICKEL

KW - NI

KW - NANOCOMPOSITE

KW - HYDROXIDE

UR - http://www.scopus.com/inward/record.url?scp=85060880465&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2019.01.324

DO - 10.1016/j.jallcom.2019.01.324

M3 - Article

AN - SCOPUS:85060880465

VL - 786

SP - 198

EP - 204

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

ER -