Three‐In‐One Alkylamine‐Tuned MoO_x for Lab‐Scale to Real‐Life Aqueous Supercapacitors

Abstract

Aqueous supercapacitors show advantages of high safely, prolonged lifespan, and low cost, etc. but there have never been commercial market products, nor quantitative investigation of practical pouch devices of aqueous supercapacitors. Herein, to achieve their lab‐scale to real‐life manufacture, a unique MoOx for supercapacitor use is constructed by a hydrothermal and annealing strategy suitable for industrialization, which plays three key functions, including precisely adjusted interlayer spacing, conductive flexible graphite carbon and abundant oxygen vacancies. As a result, the as‐synthesized electrode yields an ultra‐high specific capacitance of 717 F g−1 at 1 A g−1 and ultra‐long cycling durability with no obvious capacitive loss even after 100 000 cycles. Realistically, the assembled asymmetric supercapacitor (MoOx‐HDA‐3//MnO2) exhibits extraordinary energy density of 78.2 Wh kg−1, superior to many advanced supercapacitors reported to date. We have fabricated pouch devices, which can successfully run 3C products such as tablets and smartphones, and maintain stable electrochemical performance even after heavy strikes, fires, and pressures. Quantitative investigation results confirm that the pouch device delivers an excellent specific capacitance of 74.7 F g−1 and a high energy density of 41.5 Wh kg−1. This work enhances the confidence of pushing aqueous supercapacitors to realistic energy storage market.

WITHDRAWN: Prussian blue analogue derived nitrogen‒carbon mixed metal sulfides heterostructure for asymmetric supercapacitors

“…In recent years, the speed of human consumption of resources is much faster than the speed of resource generation. In the long term, human will fall into the dilemma of energy shortage, and the vision of developing new energy storage devices is constantly enhanced [1][2][3][4]. Batteries and supercapacitors as examples of modern energy storage technology convert chemical reactions into electric energy by using materials with abundant reserves, thus relieving the traditional situation of simply relying on oil and coal for energy supply [5].…”

Regulating the electronic structure of manganese-based materials to optimize the performance of zinc-ion batteries

“…In addition, studies on manganese-based materials with nonmetallic species intercalation are scarce at present. By referring to the intercalation species, such as polyvinyl pyrrolidone (PVP), [148][149][150] alkylamines, 150 and poly(3,4-ethylenedioxythiophene) (PEDOT), 151,152 which are applied to other electrode materials such as vanadium, molybdenum-based, and tungsten-based materials, it is expected to obtain some intercalated species with application prospects for electronic structure the regulation of manganese-based materials.…”

Oxygen defect-mediated NiCo2O4 nanosheets as the electrode for pseudocapacitors with improved rate capability

“…Very recently, the introduction of oxygen defects in transition metal oxides to act as shallow donors has been proved to be a rational strategy to improve the electrical conductivity and regulate the valences of metal ions, thus leading to superior electrochemical performance. 6,[31][32][33][34][35] However, to date, there have been few reports on the construction of NiCo 2 O 4 with a 2D nanostructure, abundant oxygen defects and enhanced electrical conductivity to achieve a large specific capacitance and ultrahigh rate capacity simultaneously.…”