通过Si-Ir合进行接口d频段中心调制,可实现高效且持久的酸性太阳能水分离
Chao-Qun Li1, Nan Yang2, Kepeng Song3
1State Key Laboratory of Crystal Materials, Shandong University, Jinan, P.R. China.
Angewandte Chemie (International ed. in English)
|February 13, 2026
概括
这项研究用氧化和氧化增强了血光电极,以在酸性介质中有效地进行太阳能水分裂. 双修改的光电极实现了创纪录的光电流和稳定性,推进了太阳能气生产.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 光催化作用的光催化
背景情况:
- 酸性介质中的光电化学 (PEC) 水氧化面临着光腐蚀和反应速度缓慢的挑战.
- 血 (α-Fe2O3) 是一个有前途的光电极材料,但在酸性条件下遭受不稳定和低效.
研究的目的:
- 开发一种新的双修饰策略,用于血光电极,以提高酸性PEC水氧化中的效率和稳定性.
- 研究氧化被动化和氧化可催化剂对血性能的协同效应.
主要方法:
- 用氧化 (SiO_x) 和氧化 (IrO_x) 制造双重修饰的血光电极.
- 在酸性电解质中进行电化学和光电化学表征.
- 表面被动化和共催化剂整合分析.
- 密度函数理论 (DFT) 计算以了解电子界面相互作用.
主要成果:
- 优化的Fe2O3-Si/Ir光电极在1.23VRHE时实现了2.32mA cm−2的记录光电密度.
- 证明了特殊的稳定性,光电极在酸性条件下有效运行超过60分钟.
- SiO_x层有效地被动化了表面状态,促进了均的IrO_x网络形成,并防止了过氧化.
- 在Si-Ir接口上有强烈的电子相互作用的证据,增强电荷转移并减少水氧化的激活能量.
结论:
- 与SiO_x和IrO_x的双修饰方法提供了一个协同策略,用于在酸性介质中高效且持久的基于血的PEC水氧化.
- 这项工作通过改进的光电极设计为实际太阳能气生产提供了可行的途径.
- SiO_x的多功能作用对于克服血PEC性能限制至关重要.
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