Carbon‐Enriched Cobalt Phosphide with Assorted Nanostructure as a Multifunctional Electrode for Energy Conversion and Storage Devices

A single‐step hydrothermal technique is applied to prepare cobalt phosphide with multifarious nanostructures to signify its multifunctional capabilities. The prepared electrodes were intensely analysed for both the energy conversion and energy storage systems. The acquired Co−P with the assorted morphology of scaffolds and spherical of Co 2 P/C electrode inspires with a significantly lower oxygen evolution reaction (OER) (271 mV ) and hydrogen evolution reaction (HER) (207 mV ) overpotentials to accelerate progressive electrocatalytic activity. Additionally, the energy storage capacity was revealed with the Co 2 P electrode delivering an enriched specific capacity (322 C g −1 at 1 A g −1 ) in conjunction with noteworthy rate capability (83%) and durable cycling stability (10000 cycles). Overall, an aqueous supercapattery device (Co 2 P/C∥AC) was fabricated providing superior energy density (35 Wh kg −1 ) and an improved power density (5333 W kg −1 ). The assembled water splitting system demanded a low cell voltage of 1.63 V to afford a high current density of 10 mA cm −2 . Moreover, the fabricated Co 2 P/C∥AC supercapattery coupled with the assembled water splitting system, to promote a supercapattery driven water splitting system profoundly proving the Co 2 P propensity of handling the multifunctional challenges in terms of both storage and conversion aspects.