CoO-rGO@CoAlZn-LDH Electrode

High capacitance, long cycle life

A 3D porous hydrangea-like architecture with a CoO-rGO skeleton and CoAlZn-LDH functional layer synergistically enhances conductivity and active-site utilization, overcoming the stacking and poor conductivity of conventional LDHs.

Shen, Qiang · Tianzeng, Ru · Zhibo, Shen · Hao, Yin · Licheng, Zhu · Minghui, Guo · Xin, Zhou · Tao, Geng · Yang, Shengchen · Pan, Guoxiang · Jun, Ren

Journal of Energy Storage 2026

Specifications

Specific Capacitance

{'zh': '2552', 'en': '2552'} F/g

Capacitance Retention

{'zh': '85.9', 'en': '85.9'} %

Energy Density

{'zh': '102.4', 'en': '102.4'} Wh/kg

Capacity Retention

{'zh': '81.8', 'en': '81.8'} %

Advantages

High capacitance

The CoO-rGO framework provides mechanical support and suppresses LDH agglomeration, allowing dense CoAlZn-LDH nanosheets to expose more active sites for Faradaic reactions, achieving 2552 F/g at 1 A/g.

Long cycle life

After 10,000 cycles at a high current density of 16 A/g, capacitance retention remains 85.9%, indicating structural stability during repeated charge/discharge.

High energy density

When assembled with activated carbon into a hybrid supercapacitor, it achieves an energy density of 102.4 Wh/kg at a power density of 811.1 W/kg, with 81.8% capacity retention after 10,000 cycles, suitable for high-energy storage applications.

Applications

• Supercapacitors：Used as supercapacitor electrodes to replace conventional carbon or single LDH, improving energy and power density.
• Electrochemical Energy Storage：As a high-performance electrode material for electrochemical energy storage systems requiring high capacitance and long cycling.
• Layered Double Hydroxides：Overcomes intrinsic poor conductivity and stacking of LDHs via composite and structural design, broadening their application.
• Graphene Composites：Uses graphene-based composites to enhance conductivity and mechanical stability, improving overall electrode performance.
• Flexible Energy Storage Devices：The 3D porous structure imparts flexibility, enabling use in flexible energy storage devices.