TY - JOUR
T1 - Heterojunction formation in In2O3–NiO nanocomposites
T2 - Towards high specific capacitance
AU - Jabeen, Sobia
AU - Iqbal, Javed
AU - Arshad, Aqsa
AU - Williams, James
AU - Samarin, Sergey
AU - Rani, Maria
PY - 2020/11/25
Y1 - 2020/11/25
N2 - This study focuses on (In2O3)x(NiO)100-x nanocomposites intended to be used in supercapacitors as electrode materials. Nanocomposites with different ratios of NiO and In2O3 have been synthesized and characterized using XRD, FTIR, TEM and UV–visible spectroscopy. The bandgap energy (Eg) data reveals that the minimum value of Eg in (In2O3)x(NiO)100-x nanocomposites is associated with the formation of p-n heterojunction, for (In2O3)50(NiO)50 nanocomposite, based on its highest electrical resistance, obtained through I–V measurement. The electrochemical measurements depict the pseudocapacitive behaviour of (In2O3)x(NiO)100-x nanocomposites. The CV analysis shows the highest specific capacitance for (In2O3)30(NiO)70 nanocomposite, i.e., 340, 472, 782, 1002, 1381 and 2628 Fg-1 at different scan rates 100, 50, 20, 10, 5 and 1 mVs−1 respectively. Specific discharge capacitance of the same sample is measured as 831, 707, 658 and 449 Fg-1 at 1, 2, 3 and 4 Ag-1 current densities respectively. The strong interaction between closely packed In2O3 and NiO interfaces show the superior specific capacitance in (In2O3)30(NiO)70 nanocomposites compared to neat NiO and In2O3 nanostructure, thus making (In2O3)x(NiO)100-x (x = 30) nanocomposite a suitable candidate for electrode material in electrochemical application.
AB - This study focuses on (In2O3)x(NiO)100-x nanocomposites intended to be used in supercapacitors as electrode materials. Nanocomposites with different ratios of NiO and In2O3 have been synthesized and characterized using XRD, FTIR, TEM and UV–visible spectroscopy. The bandgap energy (Eg) data reveals that the minimum value of Eg in (In2O3)x(NiO)100-x nanocomposites is associated with the formation of p-n heterojunction, for (In2O3)50(NiO)50 nanocomposite, based on its highest electrical resistance, obtained through I–V measurement. The electrochemical measurements depict the pseudocapacitive behaviour of (In2O3)x(NiO)100-x nanocomposites. The CV analysis shows the highest specific capacitance for (In2O3)30(NiO)70 nanocomposite, i.e., 340, 472, 782, 1002, 1381 and 2628 Fg-1 at different scan rates 100, 50, 20, 10, 5 and 1 mVs−1 respectively. Specific discharge capacitance of the same sample is measured as 831, 707, 658 and 449 Fg-1 at 1, 2, 3 and 4 Ag-1 current densities respectively. The strong interaction between closely packed In2O3 and NiO interfaces show the superior specific capacitance in (In2O3)30(NiO)70 nanocomposites compared to neat NiO and In2O3 nanostructure, thus making (In2O3)x(NiO)100-x (x = 30) nanocomposite a suitable candidate for electrode material in electrochemical application.
KW - Cyclic voltammetry
KW - InO–NiO nanocomposites
KW - Simple chemical route
KW - Supercapacitors
UR - http://www.scopus.com/inward/record.url?scp=85087127915&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2020.155840
DO - 10.1016/j.jallcom.2020.155840
M3 - Article
AN - SCOPUS:85087127915
SN - 0925-8388
VL - 842
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 155840
ER -