This article involved the employment of the dynamic hydrogen bubble template (DHBT) technique for in-situ electrodeposition and simultaneous formation of NiCoMn trimetallic alloy nanosheets on nickel foam (NF). Compared to the NiCo/NF and NiMn/NF bimetallic electrodes, the NiCoMn/NF trimetallic alloy electrocatalyst revealed favorable activity and durability. It provides current densities (CDs) of -10, -100, -500, and -1000 mA.cm-2 at overpotentials (OPs) of -33, -131, -168, and -242 mV, respectively, and illustrates a Tafel slope (TS) of 44.2 mV.dec-1. Additionally, the NiCoMn/NF electrode can maintain its stability without significant degradation in morphology while delivering high current density (HCD) for HER (-500 mA.cm-2 at 150 h). Utilizing a NiCoMn/NF||NiCoMn/NF pairing in a water splitting (WS) setup achieved an activation potential of 1.43 V at 10 mA.cm-2 current density (CD). Furthermore, the NiCoMn/NF||NiCoMn/NF couple can withstand a 300 h chronopotentiometry test to provide a CD of 100 mA.cm-2 with high durability. In-situ and simultaneous synthesis with a fast, simple, and low-cost technique, the special morphology, the high synergy between Ni, Co, and Mn elements, as well as the superhydrophobic properties and extensive electrochemically active surface area with an ability to provide HCD, are key advantages of the NiCoMn/NF electrocatalyst. These features add to the importance of its industrial usage for the sustainable development of hydrogen energy.

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