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单原子Au/NiFe层状双氧化物电催化剂:探测氧气演化反应活动的起源
Jingfang Zhang1, Jieyu Liu2, Lifei Xi3
1Department of Chemistry, School of Science, and Tianjin Key Laboratory of Molecular Optoelectronic Science , Tianjin University , Tianjin 300072 , China.
Journal of the American Chemical Society
|March 9, 2018
概括
在铁层双氧化物 (NiFe LDH) 上的单原子金 (Au) 显著增强了氧演化反应 (OER) 的活性. 这种进步源于黄金
科学领域:
- 电化学
- 材料科学
- 催化剂
背景情况:
- 了解氧化演化反应 (OER) 对能量转化技术至关重要.
- 基于过渡金属的电催化剂,特别是层状双化物 (LDH) 上的单个原子,需要对其活动起源的基本洞察.
- 需要高效的电催化剂来促进能量转化.
研究的目的:
- 调查 NiFe LDH 系统中 OER 活动的起源.
- 探索单原子金 (Au) 装饰对NiFe LDH性能的影响.
- 通过战略催化剂设计,提高开放资源活动.
主要方法:
- 在NiFe LDH (sAu/NiFe LDH) 上支持单原子Au的合成.
- 电化学表征以评估OER活动和过量的潜能.
- 理论计算以阐明活动增强的机制.
主要成果:
- 由于现场产生的NiFe氧化,NiFe LDH表现出OER活性.
- 在NiFeLDH上的0.4%重量%的sAu装饰导致了6倍的OER活性增强.
- sAu/NiFe LDH显示过多的电位为0.21V,与理论预测非常相符.
- 由邻近的 sAu 诱导的 Fe 位点周围的电荷再分配被确定为增强活动的关键因素.
结论:
- 这项研究阐明了LDH的OER活性来源和单原子Au的作用.
- 由于接口电子效应,sAu/NiFe LDH表现出优异的OER性能.
- 这项工作为设计高效电催化剂的能源应用提供了途径.
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