Urchin-Like Ni2/3Co1/3(CO3)1/2(OH)·0.11H2O for High-Performance Supercapacitors

Abstract

Here, we report our finding in the fabrication of novel porous urchin-like Ni2/3Co1/3(CO3)1/2(OH)·0. 11H2O (denoted as NC) nanomaterial composed of numerous nanoneedles through an one-step hydrothermal method, which deliveres a high specific capacity of 318 C g−1 at a current density of 1 A g−1. Moreover, an architectural composite electrode consisting of the porous NC nanoneedles wrapped by reduced graphene oxide (rGO) nanosheets exhibits large specific capacity (431 C g−1 at 1 A g−1), high rate capability and long cycling life (94% capacity retention after 5,000 cycles at 20 A g−1). The presence of rGO in the composite electrode greatly improves the electronic conductivity, providing efficient current collection for fast energy storage.

Rational design of Fe-doped K0.8Ti1.73Li0.27O4@rGO as a high-rate and long-cycle-life anode for lithium-ion batteries

“…The x-ray diffraction (XRD) of the KLTO, Fe-KLTO, and Fe-KLTO@rGO materials was performed on an x-ray diffractometer using Cu Kα radiation (Rigaku SmartLab 3 kW) [41][42][43]. The existing form of Fe in the doped sample and other surface information was characterized by x-ray photoelectron spectroscopy (XPS; Thermo, ESCALAB 250) [44,45]. The size, morphology, and coating of the samples were measured by field emission scanning electron microscope (FESEM; JEOL, JSM-6700F) and transmission electron microscope (TEM; JEOL, JEM-2100) at 6 kV and 200 kV, respectively [46,47].…”