Development of nickel-cobalt-zinc oxide/manganese-nickel hydroxide/ reduced graphene oxide on nickel foam for efficient supercapacitors and oxygen evolution reaction applications

Incorporating carbon materials with transition metal compounds (TMC) to form the hierarchical heterostructure is a valid strategy for creating advanced electrode materials in developing supercapacitors and oxygen evolution reactions (OER). Herein, this work presents a hierarchical heterostructure, denoted as NCZO/Mn-Ni(OH)(2)/rGO/ NF, where manganese-nickel hydroxide (Mn-Ni(OH)(2)) is anchored on nickelcobalt-zinc oxide (NCZO) and grown on reduced graphene oxide/nickel foam (rGO/NF). The hierarchical heterostructure of NCZO/Mn-Ni(OH)(2)/ rGO/NF provides abundant reaction sites and enhances ion transport rates, effectively addressing the weak conductivity and restacking issue of Mn-Ni(OH)(2). Electrochemical investigations concluded that the NCZO/ Mn-Ni(OH)(2)/rGO/NF demonstrates an exceptional specific capacitance of 3344.44 F g(-1) (1505 C g(-1) or 418.1 mAh g(-1)) and excellent cycling stability (75.6% at 10000 cycles). Moreover, the NCZO/Mn-Ni(OH)(2)/rGO/NF// AC recombination exhibits excellent energy density (72.22 Wh kg(-1) at 799.87W kg(-1)) and excellent cycling stability (88.6% at 8000 cycles). In the meantime, the overpotential of the NCZO/Mn-Ni(OH)(2)/rGO/NF material at 50 mA cm- 2 was 407 mV for the OER. These results show that NCZO/Mn-Ni(OH)(2)/rGO/NF proposes an effective strategy for designing bifunctional electrode materials suitable for use in both supercapacitors and oxygen evolution reactions.