Abstract
Background: To enhance the super capacitive properties of nanocomposites, the effective method is to combine carbon nanospheres with mesoporous structures with Gd3+:α-Sb2O4 inorganic nanocomposites (NC) to form hybrid electrodes. An as-prepared hybrid electrode material possesses increased energy density, high rate of reversibility and cyclic stability when incorporated in electrochemical cyclic voltammetric studies.
Methods: In the present investigation, various wt % of C-nanospheres (Cx) (5 %, 10% and 20%) were decorated over Gd3+: α-Sb2O4 nanocomposites and were synthesized by coprecipitation method. XRD, SEM, EDX, UV-visible, and XPS are only a few of the analytical techniques used to describe the as-prepared hybrid nanocomposites. Electrochemical cyclic voltammetry was carried out in a 6 M KOH solution, three-electrode system.
Results: The crystal structure and morphology of Cx: Gd3+@ α-Sb2O4 NC showed a mixed hexagonal phase and agglomerated tiny irregularly shaped morphology that appeared as the Cx concentration increased. Redshift in optical absorption peak appeared (near UV-edge), and the optical band gap (Eg) value increased from 3.53 eV to 3.65 eV. The electrochemical supercapacitor showed the highest specific capacitance of 989 F/g at the current density of 1 A/g for C20%:Gd3+@α-Sb2O4 NC compared with Cx:Gd3+@α-Sb2O4 (x = 5% and 10%) and undoped Gd3+:α-Sb2O4 NC. The change in phase angle and Rs value of 1.98 was attributed to the ideal supercapacitor properties. The cyclic stability after 5000 cycles with 79.71% capacitive retention was exhibited by C20%:Gd3+@α-Sb2O4 NC.
Conclusion: The present research introduces ease of synthesis of hybrid electrode materials possessing high active surface area, increased energy density, high cyclic stability, and reversibility in an aqueous solution.
Graphical Abstract
[http://dx.doi.org/10.1039/C5CS00147A] [PMID: 26051987]
[http://dx.doi.org/10.1038/357477a0]
[http://dx.doi.org/10.1126/science.249.4973.1146] [PMID: 17831984]
[http://dx.doi.org/10.1039/C5CC02717A] [PMID: 26140676]
[http://dx.doi.org/10.1039/C7QI00515F]
[http://dx.doi.org/10.1016/j.jcis.2014.03.022] [PMID: 24767502]
[http://dx.doi.org/10.1016/j.jcis.2014.05.053] [PMID: 24973700]
[http://dx.doi.org/10.1016/j.ceramint.2015.09.080]
[http://dx.doi.org/10.1016/j.apsusc.2015.03.078]
[http://dx.doi.org/10.1016/j.jpowsour.2015.06.131]
[http://dx.doi.org/10.1016/j.jcis.2016.08.075] [PMID: 27592187]
[http://dx.doi.org/10.1021/acsami.5b05509] [PMID: 26284385]
[http://dx.doi.org/10.1016/j.elecom.2011.09.020]
[http://dx.doi.org/10.1021/acssuschemeng.7b00469]
[http://dx.doi.org/10.3390/nano11020538] [PMID: 33669863]
[http://dx.doi.org/10.1039/D1NA00404B] [PMID: 36133268]
[http://dx.doi.org/10.1016/j.electacta.2015.04.052]
[http://dx.doi.org/10.1002/aenm.201701082]
[http://dx.doi.org/10.1016/j.mtnano.2021.100147]
[http://dx.doi.org/10.1016/j.heliyon.2021.e08541] [PMID: 34917814]
[http://dx.doi.org/10.1016/j.rinp.2018.03.008]
[http://dx.doi.org/10.4236/wjnse.2014.41004]
[http://dx.doi.org/10.1073/pnas.052708599] [PMID: 11867751]
[http://dx.doi.org/10.1016/j.pmatsci.2016.07.001]
[http://dx.doi.org/10.1117/1.JNP.11.046016]
[http://dx.doi.org/10.1016/j.nanoen.2014.04.008]
[http://dx.doi.org/10.1016/j.jwpe.2017.04.001]
[http://dx.doi.org/10.1021/acs.energyfuels.1c01828]
[http://dx.doi.org/10.1016/S0167-577X(03)00476-2]
[http://dx.doi.org/10.1016/j.est.2018.03.006]
[http://dx.doi.org/10.1016/j.cej.2013.05.035]
[http://dx.doi.org/10.1149/1945-7111/abe44b]
[http://dx.doi.org/10.1039/C5RA24613J]
[http://dx.doi.org/10.1016/j.jsamd.2019.07.007]
[http://dx.doi.org/10.1016/j.apmt.2017.08.010]
[http://dx.doi.org/10.1002/advs.201600539] [PMID: 28725528]
[http://dx.doi.org/10.1016/j.rser.2018.10.026]
[http://dx.doi.org/10.1021/acsami.6b08367] [PMID: 27775318]
[http://dx.doi.org/10.1126/science.1132195] [PMID: 16917025]
[http://dx.doi.org/10.1021/jp206956a]