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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