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 Ni 2+ 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 1. NiMnO 3 /Ni(OH) 2 /Ag NWs electrode materials with a 3D network structure are successfully prepared. 2. The introduction of Ag NWs enhances the (110) and (101) crystal planes and increases the effective layer spacing. 3. The introduction of Ag NWs increases the content of Ni 2+ and the adsorption sites. 4. Synergistic enhancement of material structure and morphology improves performance of the electrode material.