改进了高电流密度进化反应动力学在单原子Co上,嵌入在一个有序孔结构组件中,以支持碳
Jiaqi Yu1, Yu Yan2, Yuemin Lin1,3
1Department of Chemistry, Iowa State University, Ames, IA 50011, USA. whuang@iastate.edu.
嵌入添加碳的单原子催化剂为演化反应 (HER) 提供高活性和稳定性. -NAC催化剂达到工业相关的电流密度,证明了它们对高效气生产的潜力.
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:
- 单原子催化为异质反应提供精确定义的活性位点.
- 开发高效的演化反应 (HER) 催化剂对于工业应用至关重要.
- 高电流密度电解器需要具有高活性位密度和增强质量转移的催化剂.
研究的目的:
- 设计和评估嵌入于组合碳 (NAC) 催化剂中的单原子金属,用于工业应用的HER.
- 研究Co-NAC催化剂在高性能生产中的潜力.
主要方法:
- 在聚合碳 (NAC) 催化剂中嵌入的单原子金属的合成.
- 对演化反应 (HER) 催化剂的电化学评估.
- 密度函数理论 (DFT) 计算以了解催化机制.
主要成果:
- 性能最好的Co-NAC催化剂在200 mA cm-2的电流密度下达到310 mV的HER超电位,这对工业应用很重要.
- DFT的计算表明,在单原子位上存在有利的结合,这解释了高的HER活性.
- 在性条件下,Co-NAC表现出强的性能,在性条件下,在20小时 (H细胞) 保持50mA cm-2和在100小时 (流细胞) 保持150mA cm-2的活性.
结论:
- 嵌入组合碳 (NAC) 催化剂中的单原子金属对工业相关的演化反应具有前景.
- 同NAC催化剂具有高活性,密度和稳定性,使其适合高效的生产.
- 这些发现为单原子催化在电化学能量转换中的实际应用铺平了道路.
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