由成熟诱导的嵌入形成的超稳定的支持氧化演变电催化剂
Wenjuan Shi1, Tonghao Shen2, Chengkun Xing1
1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, China.
概括
一种新方法将催化剂嵌入氧化中,增强质子交换膜水电解器 (PEMWE) 的稳定性和效率. 这一突破支持以耐用,低负载的氧气进化催化剂的太瓦级生产.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 质子交换膜水电解器 (PEMWE) 技术需要高效,稳定和经济高效的氧化进化催化剂来实现太瓦规模的部署.
- (Ir) 催化剂虽然活跃,但由于溶解,重新沉积,脱离和聚合,其稳定性较差.
研究的目的:
- 在PEMWE中开发一种稳定催化剂的新策略.
- 通过催化剂支持工程提高PEMWE的长期耐用性和效率.
主要方法:
- 使用成熟诱导的嵌入策略将催化剂纳米粒子固定在氧化支上.
- 使用冷电子断层扫描和全原子动力蒙特卡洛模拟来分析合成机制.
- 为了评估催化剂的稳定性和性能,进行了加速衰老试验 (6000小时).
主要成果:
- 嵌入策略成功地稳定了物种,防止了降解.
- 合成的催化剂实现了低Ir负荷 (0.3 mg/cm2) 与高性能 (1.72V在3A/cm2).
- 在电压降解率为1. 33μV/ h的情况下,证明了长期稳定性.
结论:
- 通过超声波同步支持生长和Ir核化对于有效的催化剂嵌入至关重要.
- 开发的嵌入式Ir催化剂为未来PEMWE系统中稳定和高效的氧气演变提供了有希望的解决方案.
- 这种方法为大规模绿色生产所必需的成本效益和耐用催化剂铺平了道路.
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