Breakthrough in Nanoparticle Research: Enhancing Catalytic Ability and Durability in Flow Batteries

Researchers from Dalian University of Technology have made a significant discovery in the field of nanotechnology, developing a new type of carbon felt electrode surface encased with bismuth nanoparticles that catalyzes the V2+/V3+ redox reaction with high efficiency and outstanding durability. This breakthrough has the potential to advance the commercial viability of high-performance flow battery technologies. The researchers proposed a novel method of immobilizing bismuth nanoparticles via a tannic acid-assisted robust immobilization process, which resulted in the creation of a stable and efficient catalytic electrode.

Key Takeaways:

• The researchers developed a carbon felt electrode surface encased with bismuth nanoparticles, which achieved 77.68% and 72.11% energy efficiencies at current densities of 300 mA cm-2 and 400 mA cm-2, respectively.
• The electrode demonstrated a remarkable increase in energy efficiency by 4.90% and 8.53% compared to pristine carbon felt batteries at 300 mA cm-2 and 400 mA cm-2, respectively.
• The discharge capacity of the batteries increased by as much as 136% at 400 mA cm-2, and the energy efficiency retention rate was 99.97% after 2000 cycles.
• The novel structured catalytic electrodes enabled the batteries to sustain high performance even after 2000 cycles, showing an energy efficiency retention rate of 99.97% and a discharge capacity decay rate of 0.014% per cycle.
• This research has been peer-reviewed and published in the Journal of Materials Chemistry A.
• The study was supported by the National Natural Science Foundation of China (NSFC), Dalian University of Technology, Wontai Power Company, and ECSA characterization studies.

Statistics:

• The new electrode achieved 77.68% energy efficiency at 300 mA cm-2, which is 4.90% higher than pristine carbon felt batteries.
• The discharge capacity increased by 136% at 400 mA cm-2, and the energy efficiency retention rate was 99.97% after 2000 cycles.
• The unique structured catalytic electrodes enabled the batteries to sustain high performance for 2000 cycles, exhibiting an energy efficiency retention rate of 99.97% and a discharge capacity decay rate of 0.014% per cycle.

Sources:

• NewsRx. Researchers from Dalian University of Technology Discuss Findings in Nanoparticles (Tannic Acid-assisted Surface Encasing of Bismuth Nanoparticles On Carbon Felt for High-performance Vanadium Redox Flow Batteries). Nanotechnology Weekly. August 18, 2025; p 3239.
• Tannic Acid-assisted Surface Encasing of Bismuth Nanoparticles On Carbon Felt for High-performance Vanadium Redox Flow Batteries. Journal of Materials Chemistry A, 2025.