Bimetallic CoMoO4 Nanosheets on Freestanding Nanofiber as Wearable Supercapacitors with Long-Term Stability

Abstract

Currently, lightweight wearable energy storage devices are in great demand owing to their use in wearable electronics and energy-efficient electric vehicles. Freestanding carbon nanofibers replace the need for metal substrates while providing a rapid electrical network owing to their excellent electrical properties. Bimetallic oxides with multivalent oxidation states facilitate the rapid transfer of electrolytic ions owing to efficient Faradaic reactions, thereby enhancing the overall energy storage capability. In this study, CoOx@CNF was derived from ZIF-67 (zeolitic-imidazolate framework) @PAN-2MI fibers that were stabilized in air at 280°C and then annealed in argon at 900°C. Subsequently, Co was seeded on the annealed CoOx@CNF and subjected to a hydrothermal process in sodium molybdate dihydrate solution to grow CoMoO4 nanosheets, eventually forming bimetallic CoMoO4@CNF. The concentration of sodium molybdate solution was varied to determine the optimal growth conditions for CoMoO4 nanosheets. The energy density of the optimal bimetallic CoMoO4@CNF sample was 166.5 μWh cm-2 at a power density of 200 μW cm-2; this represented a nearly twofold increase compared to that of the single metallic CoOx@CNF. Powering humidity sensors using only one CoMoO4@CNF supercapacitor was demonstrated. The optimal sample remained stable during long-term galvanostatic charge and discharge cycles ( N cyc = 30,000 ) and retained 100% of its specific capacitance.

Novel composite of ZnMoO4/Ni(OH)2 as an electrode material for enhanced performance in energy-storage applications

“…26 Ashwin Khadka et al synthesized FeMoO 4 nanosheets on electrospun carbon nanofibers as an electrode material for a supercapacitor and analyzed this in Na 2 SO 4 and K 2 SO 4 neutral electrolytes. 27 Rui Sheng et al studied the asymmetric supercapacitor performance of MnMoO 4 nanorods, which achieved a specific capacitance of 210.2 F g À1 . 28 Compared to other metal molybdates, the exploration of ZnMoO 4 has been limited to supercapacitor applications, and its properties have rarely been discussed.…”

In situ synthesis of europium oxide (Eu2O3) nanoparticles in heteroatom doped carbon nanofibers for boosting the cycling stability of supercapacitors

“…25 For example, Khadka et al developed a novel supercapacitor electrode by integrating FeMoO 4 nanosheets and CNFs, achieving a high areal capacitance (252 mF cm −2 ) and energy density (22.4 μW h cm −2 at 2.5 mA cm −2 ). 26 Specifically, EuCoO 3 nanofibers synthesized by Luo et al had a typical pseudocapacitive feature and showed a capacitance of 133 F g −1 at 1 A g −1 . 27 Aryanrad et al developed a Eu 2 O 3 nanorod/RGO nanocomposite, achieving a specific capacity of 403 F g −1 .…”