NiMn-Ag NWs complexes electrode material with in situ grown conductive 3D networks for enhanced supercapacitive performance by boosting Ni2+.

Power density is one of the important factors affecting the performance of electrode materials, which is hampered by ion/electron transport and agglomeration build-up problems. In this study, a novel 3D NiMnO 3 /Ni(OH) 2 /Ag NWs composite is synthesized via the introduction of Ag NWs. The introduction of Ag NWs synergistically influences the crystal structure and micro-morphology of the NiMnO 3 /Ni(OH) 2 /Ag NWs composite. The unique pentatwinned structure of Ag NWs facilitates the enhancement of the (110) and (101) crystal planes, which induces the movement of Ni 2p 3/2 , leading to a significant increase of Ni2+ concentration in the composites. This ensures an abundance of ion adsorption sites, generating materials conducive to reactive activity. This new structure increases the density of active sites and establishes a conductive network, which optimizes the electron and ion transport paths, greatly reduces the diffusion resistance at the electrode-electrolyte interface, and improves the charge transfer efficiency, thus effectively increasing the specific capacity and energy density of the material. The NiMnO 3 /Ni(OH) 2 /Ag NWs//AC device exhibits a remarkable specific capacity of 350.478 mAh·g−1 at a current density of 0.01 A cm−2, and its Ragone plot reveals a peak energy density of 81.107 Wh kg−1 at a power density of 1699.871 W kg−1. Additionally, it achieves an energy density of 60.532 Wh kg−1 at a power density of 8490.072 W kg−1. This study explores the design and application of 3D structured electrode materials, which effectively improves the specific capacity of the materials and provides a new idea to further improve the energy density of supercapacitors. The mechanism of NiMnO 3 /Ni(OH) 2 /Ag NWs grown on Ni foam. [Display omitted] • NiMnO 3 /Ni(OH) 2 /Ag NWs electrode materials with a 3D network structure are successfully prepared. • The introduction of Ag NWs enhances the (110) and (101) crystal planes and increases the effective layer spacing. • The introduction of Ag NWs increases the content of Ni2+ and the adsorption sites. • Synergistic enhancement of material structure and morphology improves performance of the electrode material. [ABSTRACT FROM AUTHOR]