Solvothermal synthesis of surfactant free spherical nickel hydroxide/graphene oxide composite for supercapacitor application

Abstract

Highlights• Use of solvothermal technique for production of nickel hydroxide/graphene oxide composite.• Spherical nickel hydroxide composed of nanosheets.• Excellent electrochemical properties of composite electrode material. AbstractSpherical composite of Ni(OH) 2 /GO was produced via a surfactant free solvothermal technique and tested as electrode materials for electrochemical capacitors. The structural and morphological analysis confirmed that deposition of Ni(OH) 2 onto GO does not change the crystal structure of pure hexagonal α-Ni(OH) 2 . Electrode fabricated from the Ni(OH) 2 /GO composite demonstrates a superior electrochemical performance when compared to that of pure Ni(OH) 2 , GO, and Mix-Ni(OH) 2 /GO electrodes with Ni(OH) 2 /GO electrode exhibiting a specific capacity of ∼420 mA h g -1 which correspond to a specific capacitance of 3619 F g -1 at 2.5 A g -1 , as well as a corresponding rate capability of 78% at 10 A g -1 . The stability study of the 2 Ni(OH) 2 /GO composite reveals a good capacity retention of ∼95% at a current density of 10 A g -1 after 3000 charge-discharge cycles.

Nonprecious bimetallic NiFe ‐layered hydroxide nanosheets as a catalyst for highly efficient electrochemical water splitting

“…The findings from the XRD analysis are further supported by those from the Raman analysis, as shown in Figure 2B. The peaks at 315.4 and 449.3 cm −1 for pure Ni(OH) 2 are associated with the Raman‐active E g and A 1g vibrations of β ‐Ni(OH) 2 , while 1038.55 cm −1 is due to the second order lattice mode 41,42 . Moreover, the additional peak at 526.4 cm −1 for the Ni 0.50 Fe 0.50 ‐layered hydroxide sample is due to the T 2g mode of iron(III) oxide (Fe 3 O 4 ) structures 43 .…”

Hierarchical 3D All‐Carbon Composite Structure Modified with N‐Doped Graphene Quantum Dots for High‐Performance Flexible Supercapacitors

“…The CN peaks demonstrated the successful nitrogen doping in the material. The O 1s spectrum shows two separated peaks including 531.7 eV (OH) and 533.5 eV (NO 2 ) . The high‐resolution N 1s spectrum can be fitted into three peaks, including pyrrolic‐N or/and pyridone‐N (399.1 eV), graphitic N (400.8 eV), and oxidized N (402.4 eV), and pyrrolic‐N/pyridone‐N is the dominant nitrogen containing surface functional groups.…”

“…Due to the increasing demand of portable and wearable electronics, such as electronic textile and flexible display, the development of flexible energy‐storage devices has become extremely attractive and important . Supercapacitors can fill the gap between traditional capacitors and lithium‐ion batteries, and are considered as one of the most prospective candidates to achieve the goal mentioned above because of their high power density, long cycle life, low cost of maintenance, and fast charge/discharge rate …”

Investigation of electrocatalytic and photocatalytic ability of Cu/Ni/TiO2/MWCNTs Nanocomposites for detection and degradation of antibiotic drug Furaltadone

“…In addition, the shoulder peaks were also observed at 461.04 and 466.98 eV, which corresponds to Ti 3+ in Ti 2 O 3 lattice. The Ti2p deconvoluted spectra indicated that both TiO 2 and Ti 2 O 3 are presented in the nanocomposites 37 – 41 . The Ni2p peaks are located at 855.6 (Ni 3+ ) and 861.31(Ni 2+ ) eV are due to 2p 3/2 and 2p 1/2 , respectively (Fig.…”