TY - JOUR

T1 - Direct synthesis of Co2Al(OH)7−2x(CO3)x·nH2O layered double hydroxide nanolayers by successive ionic layer deposition and their capacitive performance

AU - Lobinsky, A.A.

AU - Tolstoy, V.P.

AU - Gulina, L.B.

PY - 2014

Y1 - 2014

N2 - Abstract New method of synthesis of Co2Al(OH)7−2x(CO3)x·nH2O layered double hydroxide (LDH) films by successive ionic layer deposition (SILD) is presented in this paper. The obtained nanolayers were characterized by SEM, EDX, XRD, XPS, FTIR spectroscopy and electrochemical techniques. The results showed that the as-synthesized product is formed by nanosheets with a thickness of 3–5 nm, having hydrotalcite crystal structure. Electrochemical characterization of the sample prepared by 50 cycles of SILD indicated a capacitive behavior with the specific capacitance value of 900 F/g at a current density of 1 A/g and 950 F/g at 0.5 A/g in 1 mol/L KOH aqueous solution. Repeated cycling for 1000 charge–discharge cycles demonstrate that capacitance increases by 6%, so such electrodes may be used as electrodes of hybrid supercapacitors. The presented convenient route of synthesis may be used for the preparation of LDH films with high surface area and a large capacitance.

AB - Abstract New method of synthesis of Co2Al(OH)7−2x(CO3)x·nH2O layered double hydroxide (LDH) films by successive ionic layer deposition (SILD) is presented in this paper. The obtained nanolayers were characterized by SEM, EDX, XRD, XPS, FTIR spectroscopy and electrochemical techniques. The results showed that the as-synthesized product is formed by nanosheets with a thickness of 3–5 nm, having hydrotalcite crystal structure. Electrochemical characterization of the sample prepared by 50 cycles of SILD indicated a capacitive behavior with the specific capacitance value of 900 F/g at a current density of 1 A/g and 950 F/g at 0.5 A/g in 1 mol/L KOH aqueous solution. Repeated cycling for 1000 charge–discharge cycles demonstrate that capacitance increases by 6%, so such electrodes may be used as electrodes of hybrid supercapacitors. The presented convenient route of synthesis may be used for the preparation of LDH films with high surface area and a large capacitance.

KW - LDH

KW - Supercapacitor

KW - Nanolayers

KW - Layer-by-Layer

KW - SILD

U2 - 10.1016/j.apsusc.2014.09.136

DO - 10.1016/j.apsusc.2014.09.136

M3 - Article

VL - 320

SP - 609

EP - 613

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

IS - 30 November

ER -