氧离子增强氧进化反应重建阶段的结晶性
Wenbin Wang1, Qunlei Wen2, Danji Huang3
1Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, and School of Chemistry and Chemical Engineering, Southwest University, 400715, Chongqing, P. R. China.
Angewandte Chemie (International ed. in English)
|October 16, 2024
概括
研究人员开发了一种新的催化剂,它使用酸盐离子来提高氧进化反应 (OER) 的稳定性和活性. 这一进步提高了水电解中的催化剂性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 氧化演化反应 (OER) 催化剂在运行过程中经常因无形化和溶解而遭受不稳定.
- 这种不稳定性阻碍了同时实现高活性和长期耐用性.
- 开发强大的催化剂对于高效的电化学水分解至关重要.
研究的目的:
- 为了解决OER催化剂的稳定性-活动性权衡问题.
- 为了增强表面重建的催化剂层的结晶性和活性.
- 研究酸盐离子吸附在稳定无形结晶异质连接中的作用.
主要方法:
- 无形和晶体 (a-c) Ni-doped Fe2O(OH) 3NO3·H2O (Ni-FeNH) 前催化剂的合成.
- 在OER期间操作电化学表征.
- 对催化剂表面酸盐离子吸附的分析.
- 工业水电解设备的建造,用于性能测试.
主要成果:
- 在OER过程中,化酸盐离子选择性地吸附到无形晶体Fe(Ni) OOH异构连接的晶体相上.
- 酸盐吸附降低结构障碍,并激活结晶阶段的Ni和Fe离子.
- Ni-FeNH 前催化剂实现了低OER过电 (303 mV) 和高耐用性 (500小时在500 mA cm-2).
- 催化剂在高电流 (8000 mA) 的工业水电解设备中表现出极好的稳定性 (100 小时).
结论:
- 选择性酸盐吸附是一种有效的策略,可以稳定OER催化剂中的无形结晶异质连接.
- 拟议的Ni-FeNH预催化剂在氧化演化反应中表现出卓越的活性和耐用性.
- 这种方法为开发用于水电解的先进电催化剂提供了一个有希望的途径.
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