Iridium black nano-particles containing multiple twin crystal and crystal boundary structures and preparation method of iridium black nano-particles
By adjusting the pH of the iridium precursor solution and employing Joule heat treatment, iridium black nanoparticles with multiple twin and grain boundary structures were prepared, solving the problem of iridium-based catalysts having difficulty in balancing activity and stability under acidic conditions, and achieving highly efficient and stable catalytic performance.
Patent Information
- Application Number
- CN202510801123.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-16
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2045-06-16
AI Technical Summary
Existing iridium-based catalysts struggle to balance catalytic activity and stability under acidic conditions. Highly crystalline nanoparticles are prone to dissolution or aggregation under strong acid and high potential, leading to rapid attenuation of catalytic activity. Furthermore, traditional preparation methods pollute the environment.
By adjusting the pH of the iridium precursor solution and employing Joule heat treatment, rapid heating and cooling were used to control the twin boundary structure, thus preparing iridium black nanoparticles with multiple twin and grain boundary structures, inhibiting particle coarsening and increasing active sites.
The method achieves high catalytic activity and stability of iridium black nanoparticles under acidic conditions, with low overpotential and good stability, making them suitable for hydrogen production by proton exchange membrane water electrolysis, thus reducing the amount of iridium used and the preparation cost.