Bi-interface induced multi-active MCo2O4@MCo2S4@PPy (M = Ni, Zn) sandwich structure for energy storage and electrocatalysis

Rational interface tailoring of nanomaterials is a significant and efficient strategy to develop the desired electrode materials for energy storage and electrocatalysts for OER. In this work, the MCo2O4@MCo2S4@PPy sandwich structures are prepared through a simple solution approach. The as-synthesized products can be utilized directly for the electrode materials of hybrid capacitor, which delivers a specific capacitance of 835.2 C g(-1) at 1 A g(-1) and a retention rate of 90.07% after 10000 cycles, revealing that bi-interface of the product can motivate more active sites than single interface. Moreover, the sandwich structured product also exhibit low overpotential of 298 mV at 50 mA cm(-2) and 395 mV at current density of 100 mA cm(-2). In this work, the MCo2O4@MCo2S4@PPy sandwich structures are prepared through a facile solution route. The as-synthesized products can be used directly as the electrode materials for hybrid capacitor and electrocatalyst.