Search

In the realm of large-scale energy storage, sodium-ion hybrid capacitors (SICs) have emerged as promising contenders due to their impressive fusion of high energy density and power density. However, the challenge lied in addressing the slow reaction kinetics of the Faraday battery-type anode, which was difficult to match with the capacitive-type cathode. In this work, the porous structure architecture was designed by chemically bonding retiform MoS 2 nanosheets onto the interpenetrating network electrode membrane (EM) in-situ, creating an integrated electrode (CM@MoS 2). The structural synergy between MoS 2 and EM facilitated the optimal environment for Na+ transportation and storage, greatly enhancing the reaction kinetics. As the Faraday battery-type anodes, a remarkable reversible capacity retention rate of 94.2% was achieved even after undergoing 1000 cycles at 0.2 A g−1. Matching with capacitive-type cathode of activated carbon (AC), the assembling CM@MoS 2 //AC SICs also exhibited an impressive reversible capacity retention rate of 87.7% even after 10,000 cycles at 1 A g−1, and achieving 117 Wh kg−1 of the energy density at a power density of 100 W kg−1, showcasing outstanding dual-function features. The application of architectonics to Faraday battery-type anodes holds promised for providing insights and concepts for the future rational design of sodium storage materials with enhanced electrochemical properties in SICs. [Display omitted] • An integrated electrode is prepared with MoS 2 spread in the 3D porous structure of electrode membrane by C-S bonds. • The retiform MoS 2 synergistically interacts with the porous structure, providing a ultrastable Na+ storage environment. • The retention rate of reversible capacity in SIBs is as high as 94.2% after undergoing 1000 cycles at 0.2 A g−1. • After assembled SICs, an average capacity decay per cycle as low as 0.00123% is harvested during 10000 cycles at 1 A g−1. • The SICs exhibit the energy density of 117 Wh kg−1 at a power density of 100 W kg−1 and obtain 50.8 Wh kg−1 at 10 kW kg−1. [ABSTRACT FROM AUTHOR]

Transition metal sulfides are favorable candidates for anode materials in sodium-ion batteries (SIBs), but they are difficult to fully utilize owing to the agglomeration caused by high interfacial energy at the nanoscale during the process of nanoization or compounding with carbon materials. Herein, we make full use of the advantages of the porous structure of electrode membrane (EM) to obtain a new composite electrode material with nickel monosulfide (NiS) nanoparticles uniformly spread in the membrane pores through covalent bonds. The developed 3D hierarchical porous structure and high specific area of membrane matrix provide strong space for the exposure of NiS active sites, and the NiS nanolayers loaded in the membrane pores also exhibit high porosity, thereby greatly improving its utilization. Compared with pure NiS electrode, it exhibits excellent sodium storage performance during long-term cycles and delivers an inspiring reversible capacitance of 658.3 mA h g−1 at 50 mA g−1. Moreover, the designed composite electrode exhibits excellent flexibility and structural stability before and after long cycles. The favorable performance is the result of the synergy between the 3D hierarchical porous structure and the high utilization of NiS. Considering that the unique porous structure of membrane technology can provide a positive effect on the improvement of NiS utilization, this research provides a simple and feasible design idea for SIBs composite electrodes with high utilization of nano-active materials by porous structural materials. [Display omitted] • Flexible composite anodes are prepared with NiS spread in the 3D hierarchical pores of electrode membrane by C-S bonds. • NiS exhibits high utilization for Na+ storage owing to the exposure of active sites by the membrane porous structure. • The maximum reversible capacity in SIBs is 658.3 mA h g−1 at 50 mA g−1. • This paper provides an idea for SIBs composite anodes with high utilization of nano-active materials by porous structure. [ABSTRACT FROM AUTHOR]