The present work addresses the limitations by fabricating a wide range of negative electrodes, including metal nitrides/sulfides on a 3D bimetallic conductive porous network (3D-Ni and 3D-NiCo) via a dynamic hydrogen bubble template (DHBT) method followed by vapour phase growth (VPG) process. Among the prepared negative electrodes, the 3D-Fe3 S4 -Fe4 N/NiCo nanostructure demonstrates an impressive specific capacitance (Cs ) of 1125 F g-1 (2475 mF cm-2 ) at 1 A g-1 with 80% capacitance retention over 5000 cycles. Similarly, a 3D-Mn3 P nanostructured positive electrode fabricated via electrodeposition followed by a phosphorization process exhibits a maximum specific capacity (Cg ) of 923.04 C g-1 (1846.08 mF cm-2 ) at 1 A g-1 with 80% stability. A 3D-Mn3 P/Ni//3D-Fe3 S4 -Fe4 N/NiCo supercapattery is also assembled, and it shows a notable CS of 151 F g-1 at 1 A g-1 , as well as a high energy density (ED) of 51 Wh kg-1 ,a power density (PD) of 782.57 W kg-1 and a capacitance efficiency of 76% over 10 000 cycles. This may be ascribed to the use of a bimetallic 3D porous conductive template and the attachment of transition metal sulfide and nitride. The development of negative electrodes and supercapattery devices is greatly aided by this exploration of novel synthesis techniques and material choice.
Keywords: 3D Network; binder free; iron nitride; iron sulfide; manganese phosphide; supercapattery; vapour phase growth.
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