About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Materials for Energy Conversion and Storage 2026
|
| Presentation Title |
Ultralow Overpotential for Oxygen Evolution Achieved with Sodium-doped Bismuth Ruthenium Oxide Nano-Particles for Water Electrolysis |
| Author(s) |
Aya Okazaki, Masatsugu Morimitsu |
| On-Site Speaker (Planned) |
Masatsugu Morimitsu |
| Abstract Scope |
We present a novel electrocatalyst for oxygen evolution in alkaline solutions, which is used in both alkaline water electrolysis and anion-exchange membrane water electrolysis. This catalyst, a sodium-doped bismuth ruthenium oxide, is produced via the thermal decomposition of a precursor obtained by adding NaOH to a solution of metal salts containing Bi(III) and Ru(IV). The pyrochlore nanoparticles exhibited an ultralow overpotential of only 97 mV for oxygen evolution reaction in 0.1 mol/L KOH at RT. Analysis of the polarization curves revealed a Tafel slope of 30 mV/dec, which significantly reduced the overpotential. These results suggest that the cell voltage of AWE or AEMWE could be reduced by up to 15% compared to anodes currently comprising nickel-based oxide catalysts. This work was supported by NEDO Project No. JPNP20003. |
| Proceedings Inclusion? |
Planned: |