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Abstract:
For the development of the next generation of portable energy storage devices, compression tolerant electrodes are essential, but most of previous reports focused only on carbon-based materials. Herein, gelatin methacrylate (GelMA) and poly(N-isopropylacrylamide) (PNIIPAM) were used as host to incorporate Co3O4@MoS2 Aerogel (Co3O4@MoS2 AG). The GelMa-PNIPAM (GP) was transformed into carbon network as an intrinsically compressible host template with high conductivity. The as-prepared electrode possesses a reversible compressive strain of 80% with excellent durability. Density functional theory (DFT) calculations show that the Co3O4@MoS2-AG heterostructure exhibits high electronic conductivity, low adsorption energy for OH- ions and fast electron transfer capacity, which enhance the electrochemical performance with high specific capacitance of 1026.9 at 1 A g-1 with remarkable cycling stability of 80.8% after 10,000 charge-discharge cycles. Besides, the assembled asymmetric supercapacitor based on compressible Co3O4@MoS2 AG/RGO exhibits stable energy storage performance under different compressive strains and after 100 compression-release cycles. The results of this study demonstrate the potential of metal-based electrode with high energy storage properties for wearable devices.

Keywords:
Compressible electrode, Assymetric supercapacitor, Aerogel, CO3O4, MoS2

Abstract:
Catalyst design plays a critical role in ensuring sustainable andeffective energy conversion. Electrocatalytic materials need tobe able to control active sites and introduce defects in bothacidic and alkaline electrolytes. Furthermore, producing efficientcatalysts with a distinct surface structure advances ourcomprehension of the mechanism. Here, a defect-engineeredheterointerface of ruthenium doped cobalt metal organic frame(Ru-CoMOF) core confined in MoS2 is reported. A tailored designapproach at room temperature was used to induce defects andform an electron transfer interface that enhanced the electro-catalytic performance. The Ru-CoMOF@MoS2 heterointerfaceobtains a geometrical current density of 10 mA-2 by providinghydrogen evolution reaction (HER) and oxygen evolutionreaction (OER) at small overpotentials of 240 and 289 mV,respectively. Density functional theory simulation shows thatthe Co-site maximizes the evolution of hydrogen intermediateenergy for adsorption and enhances HER, while the Ru-site, onthe other hand, is where OER happens. The heterointerfaceprovides a channel for electron transfer and promotes reactionsat the solid-liquid interface. The Ru-CoMOF@MoS2 modelexhibits improved OER and HER efficiency, indicating that itcould be a valuable material for the production of water-alkaline and acidic catalysts