Nickel cobalt oxide nanowires‐modified hollow carbon tubular bundles for high‐performance sodium‐ion hybrid capacitors

Abstract

Summary Sodium‐ion hybrid capacitors are a prospective energy storage device candidate that couples the superiorities of battery‐type and capacitive storage mechanisms. In this study, we fabricate a composite of NiCo2O4 nanowires with carbon tubular bundles (CTBs) via a facile hydrothermal and annealing procedure. The density functional theory (DFT) calculations are performed to evaluate the bonding strength between the two components of the composite, the binding energy of the NiCo2O4 is calculated to be −0.952 J m−2, indicating that the NiCo2O4 nanowires can be stabilized on both sides of the carbon tubular bundles, which leads to a good cycling performance. Moreover, the composite in this work exhibits a metallic property because of the introduction of carbon material. As expected, when used for sodium storage, the NiCo2O4/CTBs shows a high capacity of 298 mA h g−1 at 1 A g−1 and high capacity retention of 92% after 500 cycles, which are superior than the bare NiCo2O4 electrode. Consequently, the sodium‐ion hybrid capacitor is also assembled with NiCo2O4/carbon tubular bundles and commercial activated carbon, which achieves high energy density of 99 Wh kg−1 in a wide potential range from 0.5 V to 4.0 V.

Comprehensive Understanding of Sodium‐Ion Capacitors: Definition, Mechanisms, Configurations, Materials, Key Technologies, and Future Developments

“…Compared with nickel oxide and cobalt oxide, NiCo 2 O 4 has stronger redox activity, better electrical conductivity and higher electrochemical performances. [ 177 ] In 2013, Ding et al. investigated spinel nickel cobaltite (NiCo 2 O 4 ) as the anode materials of SICs for the first time, and prepared NiCo 2 O 4 materials by a simple and scalable chemical deposition method.…”

Tropical fruit waste‐derived mesoporous rock‐like Fe2O3/C composite fabricated with amphiphilic surfactant‐templating approach showing massive potential for high‐tech applications

“…Thus, the DCF removal rate decreases, after the attainment of certain equilibrium. 56,57 F I G U R E 3 SEM micrograph of, A and B, RC, C and D, GAC and, E and F, GMAC products were derived from Crescentia cujete fruit shell at different magnifications F I G U R E 4 DCF Adsorption activities of DCF onto RC, GAC, and GMAC materials: A, Effect of pH on adsorption/desorption process (3)(4)(5)(6)(7)(8)(9)(10)(11), B, Effect of treatment time (5-180 minutes), (C) effect of adsorbent dose (25-175 mg) on during adsorption treatment, D, E, and F were the isotherm comparisons of RC, GAC, and GMAC adsorbents, respectively (50 mL of 50 mg/L DCF solution is used for all the adsorption experiments)…”

“…The surface modified ACs present an improvement to the inherent properties of the raw carbon (RC), in the way of a high accessible rate, more flexibility and very strong mechanical strength owing to their highly porous interlinking structure. [3][4][5] Hence, porous activated carbon is broadly focused on both the adsorption and supercapacitance fields. Presently, many biowastes, along with rice husk, 6 paddy straw, 7 residual microalgae, 8 walnut shell, and rapeseed shell, 9 have been applied as starting sources to synthesis high surface carbon resources.…”

“…Due to huge surface area, and massive electrical conductivity, high mechanical power, and less density, ACs has been commonly employed newly for our environmental and energetical applications. The surface modified ACs present an improvement to the inherent properties of the raw carbon (RC), in the way of a high accessible rate, more flexibility and very strong mechanical strength owing to their highly porous interlinking structure 3‐5 . Hence, porous activated carbon is broadly focused on both the adsorption and supercapacitance fields.…”

Confining FeS in graphitized carbon with void space for high and stable electrochemical storage performance of Na + and K +

“…When new SEI films are continuously formed during each cycle of the charge/discharge process, the electrolyte will be seriously consumed with inevitable capacity loss. 12 To solve these problems, many strategies have been explored in various transitional metal compound systems, such as morphology control [13][14][15][16] constructing nanosized structures [17][18][19] and compositing with passive materials. [20][21][22][23][24] These works have greatly improved the electrochemical storage of Na-ion in transitional metal compound electrode.…”