局部氧气空隙介导的氧气交换为活跃和持久的酸性水氧化
Ning Zhang1,2, Xinyi Liu1, Haixia Zhong1,2
1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625, Renmin Street, Chaoyang District, Changchun, 130022, P.R. China.
Angewandte Chemie (International ed. in English)
|March 26, 2025
概括
这项研究开发了一种新的氧化催化剂 (IrOx-3Nd) 用于酸氧演化反应 (OER),这对于通过质子交换膜水电解剂 (PEMWEs) 可持续生产至关重要. 催化剂表现出高活性和特殊的耐用性,为高效的绿色产生铺平了道路.
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
- 催化剂是一种催化剂.
背景情况:
- 开发活跃和持久的酸氧演化反应 (OER) 催化剂对于可持续生产中的质子交换膜水电解剂 (PEMWE) 技术至关重要.
- 在恶劣的酸性和氧化条件下实现高催化活性和长期稳定性之间的平衡仍然是OER催化剂面临的重大挑战.
研究的目的:
- 开发一种新的伪形态氧化物 (IrOx) 催化剂,增强酸性OER的活性和耐用性.
- 调查负责改善催化性能和稳定性的潜在机制.
主要方法:
- 采用一种普遍的稀土辅助热解出方法来合成催化剂.
- 在现场表征和理论计算被用来分析催化剂的结构和反应机制.
主要成果:
- 合成的IrOx-3Nd催化剂表现出较低的超电位 (206 mV在10 mA cm-2) 和显著的长期耐用性 (2200 h,降解率为0.009 mV h-1).
- 催化剂在PEMWE中表现出高效率,在1.68V的电压下在1A cm-2下运行1000小时.
- 在局部订制的鲁 IrO结构中,格子氧气空缺和收缩的 Ir-O 键被确定为增强活性和耐久性的关键因素.
结论:
- 量身定制的局部配置,特别是缺陷地点和结构排序,对于提高开放式资源催化剂性能至关重要.
- 这项研究为OER催化剂的促进机制提供了新的见解,突出了氧气空缺在活性和耐久性中的作用.
- 开发的IrOx-3Nd催化剂代表了使用PEMWEs实际生产的重大进步.
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