Effective Energy Storage Performance Derived from 3D Porous Dendrimer Architecture Metal Phosphides//Metal...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Limitations in current energy storage devices necessitate advanced electrode materials.
• Three-dimensional (3D) bimetallic conductive porous networks offer enhanced electrochemical performance.
• Novel synthesis methods are crucial for fabricating high-performance electrode nanostructures.

Purpose of the Study:

• To fabricate diverse negative electrodes using metal nitrides/sulfides on 3D bimetallic networks.
• To develop and test a novel supercapattery device utilizing these advanced electrode materials.
• To explore the potential of dynamic hydrogen bubble template (DHBT) and vapor phase growth (VPG) methods.

Main Methods:

• Fabrication of 3D bimetallic conductive porous networks (3D-Ni, 3D-NiCo) using the DHBT method.
• Vapor phase growth (VPG) process for synthesizing metal nitrides/sulfides on the 3D networks.
• Electrodeposition and phosphorization for creating 3D-Mn3P positive electrodes.
• Assembly and electrochemical testing of a 3D-Mn3P/Ni//3D-Fe3S4-Fe4N/NiCo supercapattery.

Main Results:

• The 3D-Fe3S4-Fe4N/NiCo nanostructure achieved a specific capacitance of 1125 F g⁻¹ with 80% retention over 5000 cycles.
• The 3D-Mn3P positive electrode showed a maximum specific capacity of 923.04 C g⁻¹ with 80% stability.
• The assembled supercapattery delivered a specific capacitance of 151 F g⁻¹, high energy density (51 Wh kg⁻¹), power density (782.57 W kg⁻¹), and 76% capacitance efficiency over 10,000 cycles.

Conclusions:

• The bimetallic 3D porous conductive template and transition metal sulfide/nitride attachment are key to enhanced performance.
• Novel synthesis techniques and material choices significantly advance negative electrode and supercapattery development.
• The fabricated supercapattery demonstrates promising potential for next-generation energy storage solutions.