为制造具有高负载的Pt单原子作为电催化演化和氧减小反应的双功能催化剂的级联定策略
Nan Wang1, Riguo Mei1, Xidong Lin1
1Julong College, Shenzhen Technology University, Shenzhen 518118, P. R. China.
ACS applied materials & interfaces
|June 10, 2023
概括
研究人员开发了一种新方法,在添加碳 (PtSAC-NC) 上制造高负载单原子催化剂,以实现高效的能源应用. 这一突破阻止了金属聚合,使得在进化和氧减少反应中具有更高的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 电化学 电化学 电化学
背景情况:
- 在碳支上的单原子催化剂 (SAC) (MSAC-NC) 在异质催化中表现有前途.
- 由于高温下金属聚合,可控的大规模合成高度MSAC-NC仍然具有挑战性.
研究的目的:
- 开发一种新的逐步定策略,用于合成高金属负载的孤立单原子催化剂 (PtSAC-NC) .
- 为了研究合成的PtSAC-NC的催化性能,用于演化反应 (HER) 和氧减少反应 (ORR).
主要方法:
- 逐步定策略使用1,10-o-phenanthroline Pt合物在添加碳 (NC) 上.
- 使用能量分散式X射线光谱学 (EDS) 进行Pt负荷的表征.
- 对HER和ORR活性和稳定性的电化学评估.
- 理论计算 (DFT) 了解催化机制.
主要成果:
- 在PtSAC-NC中达到高的Pt负载,高达5.31%的重量,防止通过化聚合.
- 在低超电位 (24 mV) 和Tafel斜率 (60.25 mV dec-1) 的情况下表现出了出色的HER性能.
- 呈现出优异的ORR活性和稳定性,理论计算支持增强的H2O激活和H2O脱吸.
结论:
- 级联定策略有效地产生高密度的PtSAC-NC催化剂.
- 合成的催化剂为HER和ORR应用提供了显著的优势.
- 这种方法为设计其他稳定的MSAC-NC催化剂提供了一条途径.
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